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port read & write

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0 parents commit b87a248498dc4bfb1aedb8c4079c178618005bcd WardCunningham committed Jun 3, 2010
Showing with 1,849 additions and 0 deletions.
  1. +614 −0 Makefile
  2. +184 −0 txtzyme.c
  3. +927 −0 usb_serial.c
  4. +124 −0 usb_serial.h
614 Makefile
@@ -0,0 +1,614 @@
+# Hey Emacs, this is a -*- makefile -*-
+#----------------------------------------------------------------------------
+# WinAVR Makefile Template written by Eric B. Weddington, Jörg Wunsch, et al.
+#
+# Released to the Public Domain
+#
+# Additional material for this makefile was written by:
+# Peter Fleury
+# Tim Henigan
+# Colin O'Flynn
+# Reiner Patommel
+# Markus Pfaff
+# Sander Pool
+# Frederik Rouleau
+# Carlos Lamas
+#
+#----------------------------------------------------------------------------
+# On command line:
+#
+# make all = Make software.
+#
+# make clean = Clean out built project files.
+#
+# make coff = Convert ELF to AVR COFF.
+#
+# make extcoff = Convert ELF to AVR Extended COFF.
+#
+# make program = Download the hex file to the device, using avrdude.
+# Please customize the avrdude settings below first!
+#
+# make debug = Start either simulavr or avarice as specified for debugging,
+# with avr-gdb or avr-insight as the front end for debugging.
+#
+# make filename.s = Just compile filename.c into the assembler code only.
+#
+# make filename.i = Create a preprocessed source file for use in submitting
+# bug reports to the GCC project.
+#
+# To rebuild project do "make clean" then "make all".
+#----------------------------------------------------------------------------
+
+
+# Target file name (without extension).
+TARGET = txtzyme
+
+
+# List C source files here. (C dependencies are automatically generated.)
+SRC = $(TARGET).c \
+ usb_serial.c \
+
+
+# MCU name, you MUST set this to match the board you are using
+# type "make clean" after changing this, so all files will be rebuilt
+#
+#MCU = at90usb162 # Teensy 1.0
+MCU = atmega32u4 # Teensy 2.0
+#MCU = at90usb646 # Teensy++ 1.0
+#MCU = at90usb1286 # Teensy++ 2.0
+
+
+# Processor frequency.
+# Normally the first thing your program should do is set the clock prescaler,
+# so your program will run at the correct speed. You should also set this
+# variable to same clock speed. The _delay_ms() macro uses this, and many
+# examples use this variable to calculate timings. Do not add a "UL" here.
+F_CPU = 16000000
+
+
+# Output format. (can be srec, ihex, binary)
+FORMAT = ihex
+
+
+# Object files directory
+# To put object files in current directory, use a dot (.), do NOT make
+# this an empty or blank macro!
+OBJDIR = .
+
+
+# List C++ source files here. (C dependencies are automatically generated.)
+CPPSRC =
+
+
+# List Assembler source files here.
+# Make them always end in a capital .S. Files ending in a lowercase .s
+# will not be considered source files but generated files (assembler
+# output from the compiler), and will be deleted upon "make clean"!
+# Even though the DOS/Win* filesystem matches both .s and .S the same,
+# it will preserve the spelling of the filenames, and gcc itself does
+# care about how the name is spelled on its command-line.
+ASRC =
+
+
+# Optimization level, can be [0, 1, 2, 3, s].
+# 0 = turn off optimization. s = optimize for size.
+# (Note: 3 is not always the best optimization level. See avr-libc FAQ.)
+OPT = s
+
+
+# Debugging format.
+# Native formats for AVR-GCC's -g are dwarf-2 [default] or stabs.
+# AVR Studio 4.10 requires dwarf-2.
+# AVR [Extended] COFF format requires stabs, plus an avr-objcopy run.
+DEBUG = dwarf-2
+
+
+# List any extra directories to look for include files here.
+# Each directory must be seperated by a space.
+# Use forward slashes for directory separators.
+# For a directory that has spaces, enclose it in quotes.
+EXTRAINCDIRS =
+
+
+# Compiler flag to set the C Standard level.
+# c89 = "ANSI" C
+# gnu89 = c89 plus GCC extensions
+# c99 = ISO C99 standard (not yet fully implemented)
+# gnu99 = c99 plus GCC extensions
+CSTANDARD = -std=gnu99
+
+
+# Place -D or -U options here for C sources
+CDEFS = -DF_CPU=$(F_CPU)UL
+
+
+# Place -D or -U options here for ASM sources
+ADEFS = -DF_CPU=$(F_CPU)
+
+
+# Place -D or -U options here for C++ sources
+CPPDEFS = -DF_CPU=$(F_CPU)UL
+#CPPDEFS += -D__STDC_LIMIT_MACROS
+#CPPDEFS += -D__STDC_CONSTANT_MACROS
+
+
+
+#---------------- Compiler Options C ----------------
+# -g*: generate debugging information
+# -O*: optimization level
+# -f...: tuning, see GCC manual and avr-libc documentation
+# -Wall...: warning level
+# -Wa,...: tell GCC to pass this to the assembler.
+# -adhlns...: create assembler listing
+CFLAGS = -g$(DEBUG)
+CFLAGS += $(CDEFS)
+CFLAGS += -O$(OPT)
+CFLAGS += -funsigned-char
+CFLAGS += -funsigned-bitfields
+CFLAGS += -ffunction-sections
+CFLAGS += -fpack-struct
+CFLAGS += -fshort-enums
+CFLAGS += -Wall
+CFLAGS += -Wstrict-prototypes
+#CFLAGS += -mshort-calls
+#CFLAGS += -fno-unit-at-a-time
+#CFLAGS += -Wundef
+#CFLAGS += -Wunreachable-code
+#CFLAGS += -Wsign-compare
+CFLAGS += -Wa,-adhlns=$(<:%.c=$(OBJDIR)/%.lst)
+CFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
+CFLAGS += $(CSTANDARD)
+
+
+#---------------- Compiler Options C++ ----------------
+# -g*: generate debugging information
+# -O*: optimization level
+# -f...: tuning, see GCC manual and avr-libc documentation
+# -Wall...: warning level
+# -Wa,...: tell GCC to pass this to the assembler.
+# -adhlns...: create assembler listing
+CPPFLAGS = -g$(DEBUG)
+CPPFLAGS += $(CPPDEFS)
+CPPFLAGS += -O$(OPT)
+CPPFLAGS += -funsigned-char
+CPPFLAGS += -funsigned-bitfields
+CPPFLAGS += -fpack-struct
+CPPFLAGS += -fshort-enums
+CPPFLAGS += -fno-exceptions
+CPPFLAGS += -Wall
+CPPFLAGS += -Wundef
+#CPPFLAGS += -mshort-calls
+#CPPFLAGS += -fno-unit-at-a-time
+#CPPFLAGS += -Wstrict-prototypes
+#CPPFLAGS += -Wunreachable-code
+#CPPFLAGS += -Wsign-compare
+CPPFLAGS += -Wa,-adhlns=$(<:%.cpp=$(OBJDIR)/%.lst)
+CPPFLAGS += $(patsubst %,-I%,$(EXTRAINCDIRS))
+#CPPFLAGS += $(CSTANDARD)
+
+
+#---------------- Assembler Options ----------------
+# -Wa,...: tell GCC to pass this to the assembler.
+# -adhlns: create listing
+# -gstabs: have the assembler create line number information; note that
+# for use in COFF files, additional information about filenames
+# and function names needs to be present in the assembler source
+# files -- see avr-libc docs [FIXME: not yet described there]
+# -listing-cont-lines: Sets the maximum number of continuation lines of hex
+# dump that will be displayed for a given single line of source input.
+ASFLAGS = $(ADEFS) -Wa,-adhlns=$(<:%.S=$(OBJDIR)/%.lst),-gstabs,--listing-cont-lines=100
+
+
+#---------------- Library Options ----------------
+# Minimalistic printf version
+PRINTF_LIB_MIN = -Wl,-u,vfprintf -lprintf_min
+
+# Floating point printf version (requires MATH_LIB = -lm below)
+PRINTF_LIB_FLOAT = -Wl,-u,vfprintf -lprintf_flt
+
+# If this is left blank, then it will use the Standard printf version.
+PRINTF_LIB =
+#PRINTF_LIB = $(PRINTF_LIB_MIN)
+#PRINTF_LIB = $(PRINTF_LIB_FLOAT)
+
+
+# Minimalistic scanf version
+SCANF_LIB_MIN = -Wl,-u,vfscanf -lscanf_min
+
+# Floating point + %[ scanf version (requires MATH_LIB = -lm below)
+SCANF_LIB_FLOAT = -Wl,-u,vfscanf -lscanf_flt
+
+# If this is left blank, then it will use the Standard scanf version.
+SCANF_LIB =
+#SCANF_LIB = $(SCANF_LIB_MIN)
+#SCANF_LIB = $(SCANF_LIB_FLOAT)
+
+
+MATH_LIB = -lm
+
+
+# List any extra directories to look for libraries here.
+# Each directory must be seperated by a space.
+# Use forward slashes for directory separators.
+# For a directory that has spaces, enclose it in quotes.
+EXTRALIBDIRS =
+
+
+
+#---------------- External Memory Options ----------------
+
+# 64 KB of external RAM, starting after internal RAM (ATmega128!),
+# used for variables (.data/.bss) and heap (malloc()).
+#EXTMEMOPTS = -Wl,-Tdata=0x801100,--defsym=__heap_end=0x80ffff
+
+# 64 KB of external RAM, starting after internal RAM (ATmega128!),
+# only used for heap (malloc()).
+#EXTMEMOPTS = -Wl,--section-start,.data=0x801100,--defsym=__heap_end=0x80ffff
+
+EXTMEMOPTS =
+
+
+
+#---------------- Linker Options ----------------
+# -Wl,...: tell GCC to pass this to linker.
+# -Map: create map file
+# --cref: add cross reference to map file
+LDFLAGS = -Wl,-Map=$(TARGET).map,--cref
+LDFLAGS += -Wl,--relax
+LDFLAGS += -Wl,--gc-sections
+LDFLAGS += $(EXTMEMOPTS)
+LDFLAGS += $(patsubst %,-L%,$(EXTRALIBDIRS))
+LDFLAGS += $(PRINTF_LIB) $(SCANF_LIB) $(MATH_LIB)
+#LDFLAGS += -T linker_script.x
+
+
+
+#---------------- Programming Options (avrdude) ----------------
+
+# Programming hardware
+# Type: avrdude -c ?
+# to get a full listing.
+#
+AVRDUDE_PROGRAMMER = stk500v2
+
+# com1 = serial port. Use lpt1 to connect to parallel port.
+AVRDUDE_PORT = com1 # programmer connected to serial device
+
+AVRDUDE_WRITE_FLASH = -U flash:w:$(TARGET).hex
+#AVRDUDE_WRITE_EEPROM = -U eeprom:w:$(TARGET).eep
+
+
+# Uncomment the following if you want avrdude's erase cycle counter.
+# Note that this counter needs to be initialized first using -Yn,
+# see avrdude manual.
+#AVRDUDE_ERASE_COUNTER = -y
+
+# Uncomment the following if you do /not/ wish a verification to be
+# performed after programming the device.
+#AVRDUDE_NO_VERIFY = -V
+
+# Increase verbosity level. Please use this when submitting bug
+# reports about avrdude. See <http://savannah.nongnu.org/projects/avrdude>
+# to submit bug reports.
+#AVRDUDE_VERBOSE = -v -v
+
+AVRDUDE_FLAGS = -p $(MCU) -P $(AVRDUDE_PORT) -c $(AVRDUDE_PROGRAMMER)
+AVRDUDE_FLAGS += $(AVRDUDE_NO_VERIFY)
+AVRDUDE_FLAGS += $(AVRDUDE_VERBOSE)
+AVRDUDE_FLAGS += $(AVRDUDE_ERASE_COUNTER)
+
+
+
+#---------------- Debugging Options ----------------
+
+# For simulavr only - target MCU frequency.
+DEBUG_MFREQ = $(F_CPU)
+
+# Set the DEBUG_UI to either gdb or insight.
+# DEBUG_UI = gdb
+DEBUG_UI = insight
+
+# Set the debugging back-end to either avarice, simulavr.
+DEBUG_BACKEND = avarice
+#DEBUG_BACKEND = simulavr
+
+# GDB Init Filename.
+GDBINIT_FILE = __avr_gdbinit
+
+# When using avarice settings for the JTAG
+JTAG_DEV = /dev/com1
+
+# Debugging port used to communicate between GDB / avarice / simulavr.
+DEBUG_PORT = 4242
+
+# Debugging host used to communicate between GDB / avarice / simulavr, normally
+# just set to localhost unless doing some sort of crazy debugging when
+# avarice is running on a different computer.
+DEBUG_HOST = localhost
+
+
+
+#============================================================================
+
+
+# Define programs and commands.
+SHELL = sh
+CC = avr-gcc
+OBJCOPY = avr-objcopy
+OBJDUMP = avr-objdump
+SIZE = avr-size
+AR = avr-ar rcs
+NM = avr-nm
+AVRDUDE = avrdude
+REMOVE = rm -f
+REMOVEDIR = rm -rf
+COPY = cp
+WINSHELL = cmd
+
+
+# Define Messages
+# English
+MSG_ERRORS_NONE = Errors: none
+MSG_BEGIN = -------- begin --------
+MSG_END = -------- end --------
+MSG_SIZE_BEFORE = Size before:
+MSG_SIZE_AFTER = Size after:
+MSG_COFF = Converting to AVR COFF:
+MSG_EXTENDED_COFF = Converting to AVR Extended COFF:
+MSG_FLASH = Creating load file for Flash:
+MSG_EEPROM = Creating load file for EEPROM:
+MSG_EXTENDED_LISTING = Creating Extended Listing:
+MSG_SYMBOL_TABLE = Creating Symbol Table:
+MSG_LINKING = Linking:
+MSG_COMPILING = Compiling C:
+MSG_COMPILING_CPP = Compiling C++:
+MSG_ASSEMBLING = Assembling:
+MSG_CLEANING = Cleaning project:
+MSG_CREATING_LIBRARY = Creating library:
+
+
+
+
+# Define all object files.
+OBJ = $(SRC:%.c=$(OBJDIR)/%.o) $(CPPSRC:%.cpp=$(OBJDIR)/%.o) $(ASRC:%.S=$(OBJDIR)/%.o)
+
+# Define all listing files.
+LST = $(SRC:%.c=$(OBJDIR)/%.lst) $(CPPSRC:%.cpp=$(OBJDIR)/%.lst) $(ASRC:%.S=$(OBJDIR)/%.lst)
+
+
+# Compiler flags to generate dependency files.
+GENDEPFLAGS = -MMD -MP -MF .dep/$(@F).d
+
+
+# Combine all necessary flags and optional flags.
+# Add target processor to flags.
+ALL_CFLAGS = -mmcu=$(MCU) -I. $(CFLAGS) $(GENDEPFLAGS)
+ALL_CPPFLAGS = -mmcu=$(MCU) -I. -x c++ $(CPPFLAGS) $(GENDEPFLAGS)
+ALL_ASFLAGS = -mmcu=$(MCU) -I. -x assembler-with-cpp $(ASFLAGS)
+
+
+
+
+
+# Default target.
+all: begin gccversion sizebefore build sizeafter end
+
+# Change the build target to build a HEX file or a library.
+build: elf hex eep lss sym
+#build: lib
+
+
+elf: $(TARGET).elf
+hex: $(TARGET).hex
+eep: $(TARGET).eep
+lss: $(TARGET).lss
+sym: $(TARGET).sym
+LIBNAME=lib$(TARGET).a
+lib: $(LIBNAME)
+
+
+
+# Eye candy.
+# AVR Studio 3.x does not check make's exit code but relies on
+# the following magic strings to be generated by the compile job.
+begin:
+ @echo
+ @echo $(MSG_BEGIN)
+
+end:
+ @echo $(MSG_END)
+ @echo
+
+
+# Display size of file.
+HEXSIZE = $(SIZE) --target=$(FORMAT) $(TARGET).hex
+#ELFSIZE = $(SIZE) --mcu=$(MCU) --format=avr $(TARGET).elf
+ELFSIZE = $(SIZE) $(TARGET).elf
+
+sizebefore:
+ @if test -f $(TARGET).elf; then echo; echo $(MSG_SIZE_BEFORE); $(ELFSIZE); \
+ 2>/dev/null; echo; fi
+
+sizeafter:
+ @if test -f $(TARGET).elf; then echo; echo $(MSG_SIZE_AFTER); $(ELFSIZE); \
+ 2>/dev/null; echo; fi
+
+
+
+# Display compiler version information.
+gccversion :
+ @$(CC) --version
+
+
+
+# Program the device.
+program: $(TARGET).hex $(TARGET).eep
+ $(AVRDUDE) $(AVRDUDE_FLAGS) $(AVRDUDE_WRITE_FLASH) $(AVRDUDE_WRITE_EEPROM)
+
+
+# Generate avr-gdb config/init file which does the following:
+# define the reset signal, load the target file, connect to target, and set
+# a breakpoint at main().
+gdb-config:
+ @$(REMOVE) $(GDBINIT_FILE)
+ @echo define reset >> $(GDBINIT_FILE)
+ @echo SIGNAL SIGHUP >> $(GDBINIT_FILE)
+ @echo end >> $(GDBINIT_FILE)
+ @echo file $(TARGET).elf >> $(GDBINIT_FILE)
+ @echo target remote $(DEBUG_HOST):$(DEBUG_PORT) >> $(GDBINIT_FILE)
+ifeq ($(DEBUG_BACKEND),simulavr)
+ @echo load >> $(GDBINIT_FILE)
+endif
+ @echo break main >> $(GDBINIT_FILE)
+
+debug: gdb-config $(TARGET).elf
+ifeq ($(DEBUG_BACKEND), avarice)
+ @echo Starting AVaRICE - Press enter when "waiting to connect" message displays.
+ @$(WINSHELL) /c start avarice --jtag $(JTAG_DEV) --erase --program --file \
+ $(TARGET).elf $(DEBUG_HOST):$(DEBUG_PORT)
+ @$(WINSHELL) /c pause
+
+else
+ @$(WINSHELL) /c start simulavr --gdbserver --device $(MCU) --clock-freq \
+ $(DEBUG_MFREQ) --port $(DEBUG_PORT)
+endif
+ @$(WINSHELL) /c start avr-$(DEBUG_UI) --command=$(GDBINIT_FILE)
+
+
+
+
+# Convert ELF to COFF for use in debugging / simulating in AVR Studio or VMLAB.
+COFFCONVERT = $(OBJCOPY) --debugging
+COFFCONVERT += --change-section-address .data-0x800000
+COFFCONVERT += --change-section-address .bss-0x800000
+COFFCONVERT += --change-section-address .noinit-0x800000
+COFFCONVERT += --change-section-address .eeprom-0x810000
+
+
+
+coff: $(TARGET).elf
+ @echo
+ @echo $(MSG_COFF) $(TARGET).cof
+ $(COFFCONVERT) -O coff-avr $< $(TARGET).cof
+
+
+extcoff: $(TARGET).elf
+ @echo
+ @echo $(MSG_EXTENDED_COFF) $(TARGET).cof
+ $(COFFCONVERT) -O coff-ext-avr $< $(TARGET).cof
+
+
+
+# Create final output files (.hex, .eep) from ELF output file.
+%.hex: %.elf
+ @echo
+ @echo $(MSG_FLASH) $@
+ $(OBJCOPY) -O $(FORMAT) -R .eeprom -R .fuse -R .lock -R .signature $< $@
+
+%.eep: %.elf
+ @echo
+ @echo $(MSG_EEPROM) $@
+ -$(OBJCOPY) -j .eeprom --set-section-flags=.eeprom="alloc,load" \
+ --change-section-lma .eeprom=0 --no-change-warnings -O $(FORMAT) $< $@ || exit 0
+
+# Create extended listing file from ELF output file.
+%.lss: %.elf
+ @echo
+ @echo $(MSG_EXTENDED_LISTING) $@
+ $(OBJDUMP) -h -S -z $< > $@
+
+# Create a symbol table from ELF output file.
+%.sym: %.elf
+ @echo
+ @echo $(MSG_SYMBOL_TABLE) $@
+ $(NM) -n $< > $@
+
+
+
+# Create library from object files.
+.SECONDARY : $(TARGET).a
+.PRECIOUS : $(OBJ)
+%.a: $(OBJ)
+ @echo
+ @echo $(MSG_CREATING_LIBRARY) $@
+ $(AR) $@ $(OBJ)
+
+
+# Link: create ELF output file from object files.
+.SECONDARY : $(TARGET).elf
+.PRECIOUS : $(OBJ)
+%.elf: $(OBJ)
+ @echo
+ @echo $(MSG_LINKING) $@
+ $(CC) $(ALL_CFLAGS) $^ --output $@ $(LDFLAGS)
+
+
+# Compile: create object files from C source files.
+$(OBJDIR)/%.o : %.c
+ @echo
+ @echo $(MSG_COMPILING) $<
+ $(CC) -c $(ALL_CFLAGS) $< -o $@
+
+
+# Compile: create object files from C++ source files.
+$(OBJDIR)/%.o : %.cpp
+ @echo
+ @echo $(MSG_COMPILING_CPP) $<
+ $(CC) -c $(ALL_CPPFLAGS) $< -o $@
+
+
+# Compile: create assembler files from C source files.
+%.s : %.c
+ $(CC) -S $(ALL_CFLAGS) $< -o $@
+
+
+# Compile: create assembler files from C++ source files.
+%.s : %.cpp
+ $(CC) -S $(ALL_CPPFLAGS) $< -o $@
+
+
+# Assemble: create object files from assembler source files.
+$(OBJDIR)/%.o : %.S
+ @echo
+ @echo $(MSG_ASSEMBLING) $<
+ $(CC) -c $(ALL_ASFLAGS) $< -o $@
+
+
+# Create preprocessed source for use in sending a bug report.
+%.i : %.c
+ $(CC) -E -mmcu=$(MCU) -I. $(CFLAGS) $< -o $@
+
+
+# Target: clean project.
+clean: begin clean_list end
+
+clean_list :
+ @echo
+ @echo $(MSG_CLEANING)
+ $(REMOVE) $(TARGET).hex
+ $(REMOVE) $(TARGET).eep
+ $(REMOVE) $(TARGET).cof
+ $(REMOVE) $(TARGET).elf
+ $(REMOVE) $(TARGET).map
+ $(REMOVE) $(TARGET).sym
+ $(REMOVE) $(TARGET).lss
+ $(REMOVE) $(SRC:%.c=$(OBJDIR)/%.o)
+ $(REMOVE) $(SRC:%.c=$(OBJDIR)/%.lst)
+ $(REMOVE) $(SRC:.c=.s)
+ $(REMOVE) $(SRC:.c=.d)
+ $(REMOVE) $(SRC:.c=.i)
+ $(REMOVEDIR) .dep
+
+
+# Create object files directory
+$(shell mkdir $(OBJDIR) 2>/dev/null)
+
+
+# Include the dependency files.
+-include $(shell mkdir .dep 2>/dev/null) $(wildcard .dep/*)
+
+
+# Listing of phony targets.
+.PHONY : all begin finish end sizebefore sizeafter gccversion \
+build elf hex eep lss sym coff extcoff \
+clean clean_list program debug gdb-config
184 txtzyme.c
@@ -0,0 +1,184 @@
+/* Simple example for Teensy USB Development Board
+ * http://www.pjrc.com/teensy/
+ * Copyright (c) 2008 PJRC.COM, LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <stdint.h>
+#include <util/delay.h>
+#include "usb_serial.h"
+
+#define LED_CONFIG (DDRD |= (1<<6))
+#define LED_OFF (PORTD &= ~(1<<6))
+#define LED_ON (PORTD |= (1<<6))
+#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
+
+void send_str(const char *s);
+uint8_t recv_str(char *buf, uint8_t size);
+void parse(const char *buf, uint8_t num);
+
+// Basic command interpreter for controlling port pins
+int main(void) {
+ char buf[32];
+ uint8_t n;
+
+ // set for 16 MHz clock, and turn on the LED
+ CPU_PRESCALE(0);
+ LED_CONFIG;
+ LED_ON;
+
+ // initialize the USB, and then wait for the host
+ // to set configuration. If the Teensy is powered
+ // without a PC connected to the USB port, this
+ // will wait forever.
+ usb_init();
+ while (!usb_configured()) /* wait */ ;
+ _delay_ms(1000);
+
+ while (1) {
+ // wait for the user to run their terminal emulator program
+ // which sets DTR to indicate it is ready to receive.
+ while (!(usb_serial_get_control() & USB_SERIAL_DTR)) /* wait */ ;
+
+ // discard anything that was received prior. Sometimes the
+ // operating system or other software will send a modem
+ // "AT command", which can still be buffered.
+ // usb_serial_flush_input();
+
+ // and then listen for commands and process them
+ while (1) {
+ // send_str(PSTR("> "));
+ n = recv_str(buf, sizeof(buf));
+ if (n == 255) break;
+ // send_str(PSTR("\r\n"));
+ parse(buf, n);
+ }
+ }
+}
+
+// Send a string to the USB serial port. The string must be in
+// flash memory, using PSTR
+//
+void send_str(const char *s) {
+ char c;
+ while (1) {
+ c = pgm_read_byte(s++);
+ if (!c) break;
+ usb_serial_putchar(c);
+ }
+}
+
+void send_num(const uint16_t num) {
+ if (num > 9) {
+ send_num(num/10);
+ }
+ usb_serial_putchar('0' + num%10);
+}
+
+// Receive a string from the USB serial port. The string is stored
+// in the buffer and this function will not exceed the buffer size.
+// A carriage return or newline completes the string, and is not
+// stored into the buffer.
+// The return value is the number of characters received, or 255 if
+// the virtual serial connection was closed while waiting.
+//
+uint8_t recv_str(char *buf, uint8_t size) {
+ int16_t r;
+ uint8_t count=0;
+
+ while (count < size) {
+ r = usb_serial_getchar();
+ if (r != -1) {
+ if (r == '\r' || r == '\n') return count;
+ if (r >= ' ' && r <= '~') {
+ *buf++ = r;
+ // usb_serial_putchar(r);
+ count++;
+ }
+ } else {
+ if (!usb_configured() ||
+ !(usb_serial_get_control() & USB_SERIAL_DTR)) {
+ // user no longer connected
+ return 255;
+ }
+ // just a normal timeout, keep waiting
+ }
+ }
+ return count;
+}
+
+// parse a user command and execute it, or print an error message
+//
+
+uint8_t port = 'd'-'a';
+uint8_t pin = 6;
+uint16_t x = 0;
+
+void execute (const char ch) {
+ switch (ch) {
+ case '0':
+ case '1':
+ case '2':
+ case '3':
+ case '4':
+ case '5':
+ case '6':
+ case '7':
+ case '8':
+ case '9':
+ x = x * 10 + (ch - '0');
+ break;
+ case 'p':
+ send_num(x);
+ send_str(PSTR("\r\n"));
+ break;
+ case 'a':
+ case 'b':
+ case 'c':
+ case 'd':
+ case 'e':
+ case 'f':
+ port = ch - 'a';
+ pin = x % 8;
+ break;
+ case '?':
+ *(uint8_t *)(0x21 + port * 3) &= ~(1 << pin); // direction = input
+ x = *(uint8_t *)(0x20 + port * 3) & (1 << pin) ? 1 : 0; // x = pin
+ break;
+ case '!':
+ if (x % 2) {
+ *(uint8_t *)(0x22 + port * 3) |= (1 << pin); // pin = hi
+ } else {
+ *(uint8_t *)(0x22 + port * 3) &= ~(1 << pin); // pin = low
+ }
+ *(uint8_t *)(0x21 + port * 3) |= (1 << pin); // direction = output
+ break;
+ }
+}
+
+void parse(const char *buf, uint8_t num) {
+ while (num--) {
+ execute(*buf++);
+ }
+}
+
+
927 usb_serial.c
@@ -0,0 +1,927 @@
+/* USB Serial Example for Teensy USB Development Board
+ * http://www.pjrc.com/teensy/
+ * Copyright (c) 2008 PJRC.COM, LLC
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+// Version 1.0: Initial Release
+// Version 1.1: support Teensy++
+// Version 1.2: fixed usb_serial_available
+// Version 1.3: added transmit bandwidth test
+// Version 1.4: added usb_serial_write
+// Version 1.5: add support for Teensy 2.0
+
+#define USB_SERIAL_PRIVATE_INCLUDE
+#include "usb_serial.h"
+
+
+/**************************************************************************
+ *
+ * Configurable Options
+ *
+ **************************************************************************/
+
+// You can change these to give your code its own name. On Windows,
+// these are only used before an INF file (driver install) is loaded.
+#define STR_MANUFACTURER L"Your Name"
+#define STR_PRODUCT L"USB Serial"
+
+// All USB serial devices are supposed to have a serial number
+// (according to Microsoft). On windows, a new COM port is created
+// for every unique serial/vendor/product number combination. If
+// you program 2 identical boards with 2 different serial numbers
+// and they are assigned COM7 and COM8, each will always get the
+// same COM port number because Windows remembers serial numbers.
+//
+// On Mac OS-X, a device file is created automatically which
+// incorperates the serial number, eg, /dev/cu-usbmodem12341
+//
+// Linux by default ignores the serial number, and creates device
+// files named /dev/ttyACM0, /dev/ttyACM1... in the order connected.
+// Udev rules (in /etc/udev/rules.d) can define persistent device
+// names linked to this serial number, as well as permissions, owner
+// and group settings.
+#define STR_SERIAL_NUMBER L"12345"
+
+// Mac OS-X and Linux automatically load the correct drivers. On
+// Windows, even though the driver is supplied by Microsoft, an
+// INF file is needed to load the driver. These numbers need to
+// match the INF file.
+#define VENDOR_ID 0x16C0
+#define PRODUCT_ID 0x047A
+
+// When you write data, it goes into a USB endpoint buffer, which
+// is transmitted to the PC when it becomes full, or after a timeout
+// with no more writes. Even if you write in exactly packet-size
+// increments, this timeout is used to send a "zero length packet"
+// that tells the PC no more data is expected and it should pass
+// any buffered data to the application that may be waiting. If
+// you want data sent immediately, call usb_serial_flush_output().
+#define TRANSMIT_FLUSH_TIMEOUT 5 /* in milliseconds */
+
+// If the PC is connected but not "listening", this is the length
+// of time before usb_serial_getchar() returns with an error. This
+// is roughly equivilant to a real UART simply transmitting the
+// bits on a wire where nobody is listening, except you get an error
+// code which you can ignore for serial-like discard of data, or
+// use to know your data wasn't sent.
+#define TRANSMIT_TIMEOUT 25 /* in milliseconds */
+
+// USB devices are supposed to implment a halt feature, which is
+// rarely (if ever) used. If you comment this line out, the halt
+// code will be removed, saving 116 bytes of space (gcc 4.3.0).
+// This is not strictly USB compliant, but works with all major
+// operating systems.
+#define SUPPORT_ENDPOINT_HALT
+
+
+
+/**************************************************************************
+ *
+ * Endpoint Buffer Configuration
+ *
+ **************************************************************************/
+
+// These buffer sizes are best for most applications, but perhaps if you
+// want more buffering on some endpoint at the expense of others, this
+// is where you can make such changes. The AT90USB162 has only 176 bytes
+// of DPRAM (USB buffers) and only endpoints 3 & 4 can double buffer.
+
+#define ENDPOINT0_SIZE 16
+#define CDC_ACM_ENDPOINT 2
+#define CDC_RX_ENDPOINT 3
+#define CDC_TX_ENDPOINT 4
+#if defined(__AVR_AT90USB162__)
+#define CDC_ACM_SIZE 16
+#define CDC_ACM_BUFFER EP_SINGLE_BUFFER
+#define CDC_RX_SIZE 32
+#define CDC_RX_BUFFER EP_DOUBLE_BUFFER
+#define CDC_TX_SIZE 32
+#define CDC_TX_BUFFER EP_DOUBLE_BUFFER
+#else
+#define CDC_ACM_SIZE 16
+#define CDC_ACM_BUFFER EP_SINGLE_BUFFER
+#define CDC_RX_SIZE 64
+#define CDC_RX_BUFFER EP_DOUBLE_BUFFER
+#define CDC_TX_SIZE 64
+#define CDC_TX_BUFFER EP_DOUBLE_BUFFER
+#endif
+
+static const uint8_t PROGMEM endpoint_config_table[] = {
+ 0,
+ 1, EP_TYPE_INTERRUPT_IN, EP_SIZE(CDC_ACM_SIZE) | CDC_ACM_BUFFER,
+ 1, EP_TYPE_BULK_OUT, EP_SIZE(CDC_RX_SIZE) | CDC_RX_BUFFER,
+ 1, EP_TYPE_BULK_IN, EP_SIZE(CDC_TX_SIZE) | CDC_TX_BUFFER
+};
+
+
+/**************************************************************************
+ *
+ * Descriptor Data
+ *
+ **************************************************************************/
+
+// Descriptors are the data that your computer reads when it auto-detects
+// this USB device (called "enumeration" in USB lingo). The most commonly
+// changed items are editable at the top of this file. Changing things
+// in here should only be done by those who've read chapter 9 of the USB
+// spec and relevant portions of any USB class specifications!
+
+static uint8_t PROGMEM device_descriptor[] = {
+ 18, // bLength
+ 1, // bDescriptorType
+ 0x00, 0x02, // bcdUSB
+ 2, // bDeviceClass
+ 0, // bDeviceSubClass
+ 0, // bDeviceProtocol
+ ENDPOINT0_SIZE, // bMaxPacketSize0
+ LSB(VENDOR_ID), MSB(VENDOR_ID), // idVendor
+ LSB(PRODUCT_ID), MSB(PRODUCT_ID), // idProduct
+ 0x00, 0x01, // bcdDevice
+ 1, // iManufacturer
+ 2, // iProduct
+ 3, // iSerialNumber
+ 1 // bNumConfigurations
+};
+
+#define CONFIG1_DESC_SIZE (9+9+5+5+4+5+7+9+7+7)
+static uint8_t PROGMEM config1_descriptor[CONFIG1_DESC_SIZE] = {
+ // configuration descriptor, USB spec 9.6.3, page 264-266, Table 9-10
+ 9, // bLength;
+ 2, // bDescriptorType;
+ LSB(CONFIG1_DESC_SIZE), // wTotalLength
+ MSB(CONFIG1_DESC_SIZE),
+ 2, // bNumInterfaces
+ 1, // bConfigurationValue
+ 0, // iConfiguration
+ 0xC0, // bmAttributes
+ 50, // bMaxPower
+ // interface descriptor, USB spec 9.6.5, page 267-269, Table 9-12
+ 9, // bLength
+ 4, // bDescriptorType
+ 0, // bInterfaceNumber
+ 0, // bAlternateSetting
+ 1, // bNumEndpoints
+ 0x02, // bInterfaceClass
+ 0x02, // bInterfaceSubClass
+ 0x01, // bInterfaceProtocol
+ 0, // iInterface
+ // CDC Header Functional Descriptor, CDC Spec 5.2.3.1, Table 26
+ 5, // bFunctionLength
+ 0x24, // bDescriptorType
+ 0x00, // bDescriptorSubtype
+ 0x10, 0x01, // bcdCDC
+ // Call Management Functional Descriptor, CDC Spec 5.2.3.2, Table 27
+ 5, // bFunctionLength
+ 0x24, // bDescriptorType
+ 0x01, // bDescriptorSubtype
+ 0x01, // bmCapabilities
+ 1, // bDataInterface
+ // Abstract Control Management Functional Descriptor, CDC Spec 5.2.3.3, Table 28
+ 4, // bFunctionLength
+ 0x24, // bDescriptorType
+ 0x02, // bDescriptorSubtype
+ 0x06, // bmCapabilities
+ // Union Functional Descriptor, CDC Spec 5.2.3.8, Table 33
+ 5, // bFunctionLength
+ 0x24, // bDescriptorType
+ 0x06, // bDescriptorSubtype
+ 0, // bMasterInterface
+ 1, // bSlaveInterface0
+ // endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
+ 7, // bLength
+ 5, // bDescriptorType
+ CDC_ACM_ENDPOINT | 0x80, // bEndpointAddress
+ 0x03, // bmAttributes (0x03=intr)
+ CDC_ACM_SIZE, 0, // wMaxPacketSize
+ 64, // bInterval
+ // interface descriptor, USB spec 9.6.5, page 267-269, Table 9-12
+ 9, // bLength
+ 4, // bDescriptorType
+ 1, // bInterfaceNumber
+ 0, // bAlternateSetting
+ 2, // bNumEndpoints
+ 0x0A, // bInterfaceClass
+ 0x00, // bInterfaceSubClass
+ 0x00, // bInterfaceProtocol
+ 0, // iInterface
+ // endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
+ 7, // bLength
+ 5, // bDescriptorType
+ CDC_RX_ENDPOINT, // bEndpointAddress
+ 0x02, // bmAttributes (0x02=bulk)
+ CDC_RX_SIZE, 0, // wMaxPacketSize
+ 0, // bInterval
+ // endpoint descriptor, USB spec 9.6.6, page 269-271, Table 9-13
+ 7, // bLength
+ 5, // bDescriptorType
+ CDC_TX_ENDPOINT | 0x80, // bEndpointAddress
+ 0x02, // bmAttributes (0x02=bulk)
+ CDC_TX_SIZE, 0, // wMaxPacketSize
+ 0 // bInterval
+};
+
+// If you're desperate for a little extra code memory, these strings
+// can be completely removed if iManufacturer, iProduct, iSerialNumber
+// in the device desciptor are changed to zeros.
+struct usb_string_descriptor_struct {
+ uint8_t bLength;
+ uint8_t bDescriptorType;
+ int16_t wString[];
+};
+static struct usb_string_descriptor_struct PROGMEM string0 = {
+ 4,
+ 3,
+ {0x0409}
+};
+static struct usb_string_descriptor_struct PROGMEM string1 = {
+ sizeof(STR_MANUFACTURER),
+ 3,
+ STR_MANUFACTURER
+};
+static struct usb_string_descriptor_struct PROGMEM string2 = {
+ sizeof(STR_PRODUCT),
+ 3,
+ STR_PRODUCT
+};
+static struct usb_string_descriptor_struct PROGMEM string3 = {
+ sizeof(STR_SERIAL_NUMBER),
+ 3,
+ STR_SERIAL_NUMBER
+};
+
+// This table defines which descriptor data is sent for each specific
+// request from the host (in wValue and wIndex).
+static struct descriptor_list_struct {
+ uint16_t wValue;
+ uint16_t wIndex;
+ const uint8_t *addr;
+ uint8_t length;
+} PROGMEM descriptor_list[] = {
+ {0x0100, 0x0000, device_descriptor, sizeof(device_descriptor)},
+ {0x0200, 0x0000, config1_descriptor, sizeof(config1_descriptor)},
+ {0x0300, 0x0000, (const uint8_t *)&string0, 4},
+ {0x0301, 0x0409, (const uint8_t *)&string1, sizeof(STR_MANUFACTURER)},
+ {0x0302, 0x0409, (const uint8_t *)&string2, sizeof(STR_PRODUCT)},
+ {0x0303, 0x0409, (const uint8_t *)&string3, sizeof(STR_SERIAL_NUMBER)}
+};
+#define NUM_DESC_LIST (sizeof(descriptor_list)/sizeof(struct descriptor_list_struct))
+
+
+/**************************************************************************
+ *
+ * Variables - these are the only non-stack RAM usage
+ *
+ **************************************************************************/
+
+// zero when we are not configured, non-zero when enumerated
+static volatile uint8_t usb_configuration=0;
+
+// the time remaining before we transmit any partially full
+// packet, or send a zero length packet.
+static volatile uint8_t transmit_flush_timer=0;
+static uint8_t transmit_previous_timeout=0;
+
+// serial port settings (baud rate, control signals, etc) set
+// by the PC. These are ignored, but kept in RAM.
+static uint8_t cdc_line_coding[7]={0x00, 0xE1, 0x00, 0x00, 0x00, 0x00, 0x08};
+static uint8_t cdc_line_rtsdtr=0;
+
+
+/**************************************************************************
+ *
+ * Public Functions - these are the API intended for the user
+ *
+ **************************************************************************/
+
+// initialize USB serial
+void usb_init(void)
+{
+ HW_CONFIG();
+ USB_FREEZE(); // enable USB
+ PLL_CONFIG(); // config PLL, 16 MHz xtal
+ while (!(PLLCSR & (1<<PLOCK))) ; // wait for PLL lock
+ USB_CONFIG(); // start USB clock
+ UDCON = 0; // enable attach resistor
+ usb_configuration = 0;
+ cdc_line_rtsdtr = 0;
+ UDIEN = (1<<EORSTE)|(1<<SOFE);
+ sei();
+}
+
+// return 0 if the USB is not configured, or the configuration
+// number selected by the HOST
+uint8_t usb_configured(void)
+{
+ return usb_configuration;
+}
+
+// get the next character, or -1 if nothing received
+int16_t usb_serial_getchar(void)
+{
+ uint8_t c, intr_state;
+
+ // interrupts are disabled so these functions can be
+ // used from the main program or interrupt context,
+ // even both in the same program!
+ intr_state = SREG;
+ cli();
+ if (!usb_configuration) {
+ SREG = intr_state;
+ return -1;
+ }
+ UENUM = CDC_RX_ENDPOINT;
+ if (!(UEINTX & (1<<RWAL))) {
+ // no data in buffer
+ SREG = intr_state;
+ return -1;
+ }
+ // take one byte out of the buffer
+ c = UEDATX;
+ // if buffer completely used, release it
+ if (!(UEINTX & (1<<RWAL))) UEINTX = 0x6B;
+ SREG = intr_state;
+ return c;
+}
+
+// number of bytes available in the receive buffer
+uint8_t usb_serial_available(void)
+{
+ uint8_t n=0, intr_state;
+
+ intr_state = SREG;
+ cli();
+ if (usb_configuration) {
+ UENUM = CDC_RX_ENDPOINT;
+ n = UEBCLX;
+ }
+ SREG = intr_state;
+ return n;
+}
+
+// discard any buffered input
+void usb_serial_flush_input(void)
+{
+ uint8_t intr_state;
+
+ if (usb_configuration) {
+ intr_state = SREG;
+ cli();
+ UENUM = CDC_RX_ENDPOINT;
+ while ((UEINTX & (1<<RWAL))) {
+ UEINTX = 0x6B;
+ }
+ SREG = intr_state;
+ }
+}
+
+// transmit a character. 0 returned on success, -1 on error
+int8_t usb_serial_putchar(uint8_t c)
+{
+ uint8_t timeout, intr_state;
+
+ // if we're not online (enumerated and configured), error
+ if (!usb_configuration) return -1;
+ // interrupts are disabled so these functions can be
+ // used from the main program or interrupt context,
+ // even both in the same program!
+ intr_state = SREG;
+ cli();
+ UENUM = CDC_TX_ENDPOINT;
+ // if we gave up due to timeout before, don't wait again
+ if (transmit_previous_timeout) {
+ if (!(UEINTX & (1<<RWAL))) {
+ SREG = intr_state;
+ return -1;
+ }
+ transmit_previous_timeout = 0;
+ }
+ // wait for the FIFO to be ready to accept data
+ timeout = UDFNUML + TRANSMIT_TIMEOUT;
+ while (1) {
+ // are we ready to transmit?
+ if (UEINTX & (1<<RWAL)) break;
+ SREG = intr_state;
+ // have we waited too long? This happens if the user
+ // is not running an application that is listening
+ if (UDFNUML == timeout) {
+ transmit_previous_timeout = 1;
+ return -1;
+ }
+ // has the USB gone offline?
+ if (!usb_configuration) return -1;
+ // get ready to try checking again
+ intr_state = SREG;
+ cli();
+ UENUM = CDC_TX_ENDPOINT;
+ }
+ // actually write the byte into the FIFO
+ UEDATX = c;
+ // if this completed a packet, transmit it now!
+ if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
+ transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
+ SREG = intr_state;
+ return 0;
+}
+
+
+// transmit a character, but do not wait if the buffer is full,
+// 0 returned on success, -1 on buffer full or error
+int8_t usb_serial_putchar_nowait(uint8_t c)
+{
+ uint8_t intr_state;
+
+ if (!usb_configuration) return -1;
+ intr_state = SREG;
+ cli();
+ UENUM = CDC_TX_ENDPOINT;
+ if (!(UEINTX & (1<<RWAL))) {
+ // buffer is full
+ SREG = intr_state;
+ return -1;
+ }
+ // actually write the byte into the FIFO
+ UEDATX = c;
+ // if this completed a packet, transmit it now!
+ if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
+ transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
+ SREG = intr_state;
+ return 0;
+}
+
+// transmit a buffer.
+// 0 returned on success, -1 on error
+// This function is optimized for speed! Each call takes approx 6.1 us overhead
+// plus 0.25 us per byte. 12 Mbit/sec USB has 8.67 us per-packet overhead and
+// takes 0.67 us per byte. If called with 64 byte packet-size blocks, this function
+// can transmit at full USB speed using 43% CPU time. The maximum theoretical speed
+// is 19 packets per USB frame, or 1216 kbytes/sec. However, bulk endpoints have the
+// lowest priority, so any other USB devices will likely reduce the speed. Speed
+// can also be limited by how quickly the PC-based software reads data, as the host
+// controller in the PC will not allocate bandwitdh without a pending read request.
+// (thanks to Victor Suarez for testing and feedback and initial code)
+
+int8_t usb_serial_write(const uint8_t *buffer, uint16_t size)
+{
+ uint8_t timeout, intr_state, write_size;
+
+ // if we're not online (enumerated and configured), error
+ if (!usb_configuration) return -1;
+ // interrupts are disabled so these functions can be
+ // used from the main program or interrupt context,
+ // even both in the same program!
+ intr_state = SREG;
+ cli();
+ UENUM = CDC_TX_ENDPOINT;
+ // if we gave up due to timeout before, don't wait again
+ if (transmit_previous_timeout) {
+ if (!(UEINTX & (1<<RWAL))) {
+ SREG = intr_state;
+ return -1;
+ }
+ transmit_previous_timeout = 0;
+ }
+ // each iteration of this loop transmits a packet
+ while (size) {
+ // wait for the FIFO to be ready to accept data
+ timeout = UDFNUML + TRANSMIT_TIMEOUT;
+ while (1) {
+ // are we ready to transmit?
+ if (UEINTX & (1<<RWAL)) break;
+ SREG = intr_state;
+ // have we waited too long? This happens if the user
+ // is not running an application that is listening
+ if (UDFNUML == timeout) {
+ transmit_previous_timeout = 1;
+ return -1;
+ }
+ // has the USB gone offline?
+ if (!usb_configuration) return -1;
+ // get ready to try checking again
+ intr_state = SREG;
+ cli();
+ UENUM = CDC_TX_ENDPOINT;
+ }
+
+ // compute how many bytes will fit into the next packet
+ write_size = CDC_TX_SIZE - UEBCLX;
+ if (write_size > size) write_size = size;
+ size -= write_size;
+
+ // write the packet
+ switch (write_size) {
+ #if (CDC_TX_SIZE == 64)
+ case 64: UEDATX = *buffer++;
+ case 63: UEDATX = *buffer++;
+ case 62: UEDATX = *buffer++;
+ case 61: UEDATX = *buffer++;
+ case 60: UEDATX = *buffer++;
+ case 59: UEDATX = *buffer++;
+ case 58: UEDATX = *buffer++;
+ case 57: UEDATX = *buffer++;
+ case 56: UEDATX = *buffer++;
+ case 55: UEDATX = *buffer++;
+ case 54: UEDATX = *buffer++;
+ case 53: UEDATX = *buffer++;
+ case 52: UEDATX = *buffer++;
+ case 51: UEDATX = *buffer++;
+ case 50: UEDATX = *buffer++;
+ case 49: UEDATX = *buffer++;
+ case 48: UEDATX = *buffer++;
+ case 47: UEDATX = *buffer++;
+ case 46: UEDATX = *buffer++;
+ case 45: UEDATX = *buffer++;
+ case 44: UEDATX = *buffer++;
+ case 43: UEDATX = *buffer++;
+ case 42: UEDATX = *buffer++;
+ case 41: UEDATX = *buffer++;
+ case 40: UEDATX = *buffer++;
+ case 39: UEDATX = *buffer++;
+ case 38: UEDATX = *buffer++;
+ case 37: UEDATX = *buffer++;
+ case 36: UEDATX = *buffer++;
+ case 35: UEDATX = *buffer++;
+ case 34: UEDATX = *buffer++;
+ case 33: UEDATX = *buffer++;
+ #endif
+ #if (CDC_TX_SIZE >= 32)
+ case 32: UEDATX = *buffer++;
+ case 31: UEDATX = *buffer++;
+ case 30: UEDATX = *buffer++;
+ case 29: UEDATX = *buffer++;
+ case 28: UEDATX = *buffer++;
+ case 27: UEDATX = *buffer++;
+ case 26: UEDATX = *buffer++;
+ case 25: UEDATX = *buffer++;
+ case 24: UEDATX = *buffer++;
+ case 23: UEDATX = *buffer++;
+ case 22: UEDATX = *buffer++;
+ case 21: UEDATX = *buffer++;
+ case 20: UEDATX = *buffer++;
+ case 19: UEDATX = *buffer++;
+ case 18: UEDATX = *buffer++;
+ case 17: UEDATX = *buffer++;
+ #endif
+ #if (CDC_TX_SIZE >= 16)
+ case 16: UEDATX = *buffer++;
+ case 15: UEDATX = *buffer++;
+ case 14: UEDATX = *buffer++;
+ case 13: UEDATX = *buffer++;
+ case 12: UEDATX = *buffer++;
+ case 11: UEDATX = *buffer++;
+ case 10: UEDATX = *buffer++;
+ case 9: UEDATX = *buffer++;
+ #endif
+ case 8: UEDATX = *buffer++;
+ case 7: UEDATX = *buffer++;
+ case 6: UEDATX = *buffer++;
+ case 5: UEDATX = *buffer++;
+ case 4: UEDATX = *buffer++;
+ case 3: UEDATX = *buffer++;
+ case 2: UEDATX = *buffer++;
+ default:
+ case 1: UEDATX = *buffer++;
+ case 0: break;
+ }
+ // if this completed a packet, transmit it now!
+ if (!(UEINTX & (1<<RWAL))) UEINTX = 0x3A;
+ transmit_flush_timer = TRANSMIT_FLUSH_TIMEOUT;
+ }
+ SREG = intr_state;
+ return 0;
+}
+
+
+// immediately transmit any buffered output.
+// This doesn't actually transmit the data - that is impossible!
+// USB devices only transmit when the host allows, so the best
+// we can do is release the FIFO buffer for when the host wants it
+void usb_serial_flush_output(void)
+{
+ uint8_t intr_state;
+
+ intr_state = SREG;
+ cli();
+ if (transmit_flush_timer) {
+ UENUM = CDC_TX_ENDPOINT;
+ UEINTX = 0x3A;
+ transmit_flush_timer = 0;
+ }
+ SREG = intr_state;
+}
+
+// functions to read the various async serial settings. These
+// aren't actually used by USB at all (communication is always
+// at full USB speed), but they are set by the host so we can
+// set them properly if we're converting the USB to a real serial
+// communication
+uint32_t usb_serial_get_baud(void)
+{
+ return *(uint32_t *)cdc_line_coding;
+}
+uint8_t usb_serial_get_stopbits(void)
+{
+ return cdc_line_coding[4];
+}
+uint8_t usb_serial_get_paritytype(void)
+{
+ return cdc_line_coding[5];
+}
+uint8_t usb_serial_get_numbits(void)
+{
+ return cdc_line_coding[6];
+}
+uint8_t usb_serial_get_control(void)
+{
+ return cdc_line_rtsdtr;
+}
+// write the control signals, DCD, DSR, RI, etc
+// There is no CTS signal. If software on the host has transmitted
+// data to you but you haven't been calling the getchar function,
+// it remains buffered (either here or on the host) and can not be
+// lost because you weren't listening at the right time, like it
+// would in real serial communication.
+// TODO: this function is untested. Does it work? Please email
+// paul@pjrc.com if you have tried it....
+int8_t usb_serial_set_control(uint8_t signals)
+{
+ uint8_t intr_state;
+
+ intr_state = SREG;
+ cli();
+ if (!usb_configuration) {
+ // we're not enumerated/configured
+ SREG = intr_state;
+ return -1;
+ }
+
+ UENUM = CDC_ACM_ENDPOINT;
+ if (!(UEINTX & (1<<RWAL))) {
+ // unable to write
+ // TODO; should this try to abort the previously
+ // buffered message??
+ SREG = intr_state;
+ return -1;
+ }
+ UEDATX = 0xA1;
+ UEDATX = 0x20;
+ UEDATX = 0;
+ UEDATX = 0;
+ UEDATX = 0; // TODO: should this be 1 or 0 ???
+ UEDATX = 0;
+ UEDATX = 2;
+ UEDATX = 0;
+ UEDATX = signals;
+ UEDATX = 0;
+ UEINTX = 0x3A;
+ SREG = intr_state;
+ return 0;
+}
+
+
+
+/**************************************************************************
+ *
+ * Private Functions - not intended for general user consumption....
+ *
+ **************************************************************************/
+
+
+// USB Device Interrupt - handle all device-level events
+// the transmit buffer flushing is triggered by the start of frame
+//
+ISR(USB_GEN_vect)
+{
+ uint8_t intbits, t;
+
+ intbits = UDINT;
+ UDINT = 0;
+ if (intbits & (1<<EORSTI)) {
+ UENUM = 0;
+ UECONX = 1;
+ UECFG0X = EP_TYPE_CONTROL;
+ UECFG1X = EP_SIZE(ENDPOINT0_SIZE) | EP_SINGLE_BUFFER;
+ UEIENX = (1<<RXSTPE);
+ usb_configuration = 0;
+ cdc_line_rtsdtr = 0;
+ }
+ if (intbits & (1<<SOFI)) {
+ if (usb_configuration) {
+ t = transmit_flush_timer;
+ if (t) {
+ transmit_flush_timer = --t;
+ if (!t) {
+ UENUM = CDC_TX_ENDPOINT;
+ UEINTX = 0x3A;
+ }
+ }
+ }
+ }
+}
+
+
+// Misc functions to wait for ready and send/receive packets
+static inline void usb_wait_in_ready(void)
+{
+ while (!(UEINTX & (1<<TXINI))) ;
+}
+static inline void usb_send_in(void)
+{
+ UEINTX = ~(1<<TXINI);
+}
+static inline void usb_wait_receive_out(void)
+{
+ while (!(UEINTX & (1<<RXOUTI))) ;
+}
+static inline void usb_ack_out(void)
+{
+ UEINTX = ~(1<<RXOUTI);
+}
+
+
+
+// USB Endpoint Interrupt - endpoint 0 is handled here. The
+// other endpoints are manipulated by the user-callable
+// functions, and the start-of-frame interrupt.
+//
+ISR(USB_COM_vect)
+{
+ uint8_t intbits;
+ const uint8_t *list;
+ const uint8_t *cfg;
+ uint8_t i, n, len, en;
+ uint8_t *p;
+ uint8_t bmRequestType;
+ uint8_t bRequest;
+ uint16_t wValue;
+ uint16_t wIndex;
+ uint16_t wLength;
+ uint16_t desc_val;
+ const uint8_t *desc_addr;
+ uint8_t desc_length;
+
+ UENUM = 0;
+ intbits = UEINTX;
+ if (intbits & (1<<RXSTPI)) {
+ bmRequestType = UEDATX;
+ bRequest = UEDATX;
+ wValue = UEDATX;
+ wValue |= (UEDATX << 8);
+ wIndex = UEDATX;
+ wIndex |= (UEDATX << 8);
+ wLength = UEDATX;
+ wLength |= (UEDATX << 8);
+ UEINTX = ~((1<<RXSTPI) | (1<<RXOUTI) | (1<<TXINI));
+ if (bRequest == GET_DESCRIPTOR) {
+ list = (const uint8_t *)descriptor_list;
+ for (i=0; ; i++) {
+ if (i >= NUM_DESC_LIST) {
+ UECONX = (1<<STALLRQ)|(1<<EPEN); //stall
+ return;
+ }
+ desc_val = pgm_read_word(list);
+ if (desc_val != wValue) {
+ list += sizeof(struct descriptor_list_struct);
+ continue;
+ }
+ list += 2;
+ desc_val = pgm_read_word(list);
+ if (desc_val != wIndex) {
+ list += sizeof(struct descriptor_list_struct)-2;
+ continue;
+ }
+ list += 2;
+ desc_addr = (const uint8_t *)pgm_read_word(list);
+ list += 2;
+ desc_length = pgm_read_byte(list);
+ break;
+ }
+ len = (wLength < 256) ? wLength : 255;
+ if (len > desc_length) len = desc_length;
+ do {
+ // wait for host ready for IN packet
+ do {
+ i = UEINTX;
+ } while (!(i & ((1<<TXINI)|(1<<RXOUTI))));
+ if (i & (1<<RXOUTI)) return; // abort
+ // send IN packet
+ n = len < ENDPOINT0_SIZE ? len : ENDPOINT0_SIZE;
+ for (i = n; i; i--) {
+ UEDATX = pgm_read_byte(desc_addr++);
+ }
+ len -= n;
+ usb_send_in();
+ } while (len || n == ENDPOINT0_SIZE);
+ return;
+ }
+ if (bRequest == SET_ADDRESS) {
+ usb_send_in();
+ usb_wait_in_ready();
+ UDADDR = wValue | (1<<ADDEN);
+ return;
+ }
+ if (bRequest == SET_CONFIGURATION && bmRequestType == 0) {
+ usb_configuration = wValue;
+ cdc_line_rtsdtr = 0;
+ transmit_flush_timer = 0;
+ usb_send_in();
+ cfg = endpoint_config_table;
+ for (i=1; i<5; i++) {
+ UENUM = i;
+ en = pgm_read_byte(cfg++);
+ UECONX = en;
+ if (en) {
+ UECFG0X = pgm_read_byte(cfg++);
+ UECFG1X = pgm_read_byte(cfg++);
+ }
+ }
+ UERST = 0x1E;
+ UERST = 0;
+ return;
+ }
+ if (bRequest == GET_CONFIGURATION && bmRequestType == 0x80) {
+ usb_wait_in_ready();
+ UEDATX = usb_configuration;
+ usb_send_in();
+ return;
+ }
+ if (bRequest == CDC_GET_LINE_CODING && bmRequestType == 0xA1) {
+ usb_wait_in_ready();
+ p = cdc_line_coding;
+ for (i=0; i<7; i++) {
+ UEDATX = *p++;
+ }
+ usb_send_in();
+ return;
+ }
+ if (bRequest == CDC_SET_LINE_CODING && bmRequestType == 0x21) {
+ usb_wait_receive_out();
+ p = cdc_line_coding;
+ for (i=0; i<7; i++) {
+ *p++ = UEDATX;
+ }
+ usb_ack_out();
+ usb_send_in();
+ return;
+ }
+ if (bRequest == CDC_SET_CONTROL_LINE_STATE && bmRequestType == 0x21) {
+ cdc_line_rtsdtr = wValue;
+ usb_wait_in_ready();
+ usb_send_in();
+ return;
+ }
+ if (bRequest == GET_STATUS) {
+ usb_wait_in_ready();
+ i = 0;
+ #ifdef SUPPORT_ENDPOINT_HALT
+ if (bmRequestType == 0x82) {
+ UENUM = wIndex;
+ if (UECONX & (1<<STALLRQ)) i = 1;
+ UENUM = 0;
+ }
+ #endif
+ UEDATX = i;
+ UEDATX = 0;
+ usb_send_in();
+ return;
+ }
+ #ifdef SUPPORT_ENDPOINT_HALT
+ if ((bRequest == CLEAR_FEATURE || bRequest == SET_FEATURE)
+ && bmRequestType == 0x02 && wValue == 0) {
+ i = wIndex & 0x7F;
+ if (i >= 1 && i <= MAX_ENDPOINT) {
+ usb_send_in();
+ UENUM = i;
+ if (bRequest == SET_FEATURE) {
+ UECONX = (1<<STALLRQ)|(1<<EPEN);
+ } else {
+ UECONX = (1<<STALLRQC)|(1<<RSTDT)|(1<<EPEN);
+ UERST = (1 << i);
+ UERST = 0;
+ }
+ return;
+ }
+ }
+ #endif
+ }
+ UECONX = (1<<STALLRQ) | (1<<EPEN); // stall
+}
+
+
124 usb_serial.h
@@ -0,0 +1,124 @@
+#ifndef usb_serial_h__
+#define usb_serial_h__
+
+#include <stdint.h>
+
+// setup
+void usb_init(void); // initialize everything
+uint8_t usb_configured(void); // is the USB port configured
+
+// receiving data
+int16_t usb_serial_getchar(void); // receive a character (-1 if timeout/error)
+uint8_t usb_serial_available(void); // number of bytes in receive buffer
+void usb_serial_flush_input(void); // discard any buffered input
+
+// transmitting data
+int8_t usb_serial_putchar(uint8_t c); // transmit a character
+int8_t usb_serial_putchar_nowait(uint8_t c); // transmit a character, do not wait
+int8_t usb_serial_write(const uint8_t *buffer, uint16_t size); // transmit a buffer
+void usb_serial_flush_output(void); // immediately transmit any buffered output
+
+// serial parameters
+uint32_t usb_serial_get_baud(void); // get the baud rate
+uint8_t usb_serial_get_stopbits(void); // get the number of stop bits
+uint8_t usb_serial_get_paritytype(void);// get the parity type
+uint8_t usb_serial_get_numbits(void); // get the number of data bits
+uint8_t usb_serial_get_control(void); // get the RTS and DTR signal state
+int8_t usb_serial_set_control(uint8_t signals); // set DSR, DCD, RI, etc
+
+// constants corresponding to the various serial parameters
+#define USB_SERIAL_DTR 0x01
+#define USB_SERIAL_RTS 0x02
+#define USB_SERIAL_1_STOP 0
+#define USB_SERIAL_1_5_STOP 1
+#define USB_SERIAL_2_STOP 2
+#define USB_SERIAL_PARITY_NONE 0
+#define USB_SERIAL_PARITY_ODD 1
+#define USB_SERIAL_PARITY_EVEN 2
+#define USB_SERIAL_PARITY_MARK 3
+#define USB_SERIAL_PARITY_SPACE 4
+#define USB_SERIAL_DCD 0x01
+#define USB_SERIAL_DSR 0x02
+#define USB_SERIAL_BREAK 0x04
+#define USB_SERIAL_RI 0x08
+#define USB_SERIAL_FRAME_ERR 0x10
+#define USB_SERIAL_PARITY_ERR 0x20
+#define USB_SERIAL_OVERRUN_ERR 0x40
+
+// This file does not include the HID debug functions, so these empty
+// macros replace them with nothing, so users can compile code that
+// has calls to these functions.
+#define usb_debug_putchar(c)
+#define usb_debug_flush_output()
+
+
+
+// Everything below this point is only intended for usb_serial.c
+#ifdef USB_SERIAL_PRIVATE_INCLUDE
+#include <avr/io.h>
+#include <avr/pgmspace.h>
+#include <avr/interrupt.h>
+
+#define EP_TYPE_CONTROL 0x00
+#define EP_TYPE_BULK_IN 0x81
+#define EP_TYPE_BULK_OUT 0x80
+#define EP_TYPE_INTERRUPT_IN 0xC1
+#define EP_TYPE_INTERRUPT_OUT 0xC0
+#define EP_TYPE_ISOCHRONOUS_IN 0x41
+#define EP_TYPE_ISOCHRONOUS_OUT 0x40
+#define EP_SINGLE_BUFFER 0x02
+#define EP_DOUBLE_BUFFER 0x06
+#define EP_SIZE(s) ((s) == 64 ? 0x30 : \
+ ((s) == 32 ? 0x20 : \
+ ((s) == 16 ? 0x10 : \
+ 0x00)))
+
+#define MAX_ENDPOINT 4
+
+#define LSB(n) (n & 255)
+#define MSB(n) ((n >> 8) & 255)
+
+#if defined(__AVR_AT90USB162__)
+#define HW_CONFIG()
+#define PLL_CONFIG() (PLLCSR = ((1<<PLLE)|(1<<PLLP0)))
+#define USB_CONFIG() (USBCON = (1<<USBE))
+#define USB_FREEZE() (USBCON = ((1<<USBE)|(1<<FRZCLK)))
+#elif defined(__AVR_ATmega32U4__)
+#define HW_CONFIG() (UHWCON = 0x01)
+#define PLL_CONFIG() (PLLCSR = 0x12)
+#define USB_CONFIG() (USBCON = ((1<<USBE)|(1<<OTGPADE)))
+#define USB_FREEZE() (USBCON = ((1<<USBE)|(1<<FRZCLK)))
+#elif defined(__AVR_AT90USB646__)
+#define HW_CONFIG() (UHWCON = 0x81)
+#define PLL_CONFIG() (PLLCSR = 0x1A)
+#define USB_CONFIG() (USBCON = ((1<<USBE)|(1<<OTGPADE)))
+#define USB_FREEZE() (USBCON = ((1<<USBE)|(1<<FRZCLK)))
+#elif defined(__AVR_AT90USB1286__)
+#define HW_CONFIG() (UHWCON = 0x81)
+#define PLL_CONFIG() (PLLCSR = 0x16)
+#define USB_CONFIG() (USBCON = ((1<<USBE)|(1<<OTGPADE)))
+#define USB_FREEZE() (USBCON = ((1<<USBE)|(1<<FRZCLK)))
+#endif
+
+// standard control endpoint request types
+#define GET_STATUS 0
+#define CLEAR_FEATURE 1
+#define SET_FEATURE 3
+#define SET_ADDRESS 5
+#define GET_DESCRIPTOR 6
+#define GET_CONFIGURATION 8
+#define SET_CONFIGURATION 9
+#define GET_INTERFACE 10
+#define SET_INTERFACE 11
+// HID (human interface device)
+#define HID_GET_REPORT 1
+#define HID_GET_PROTOCOL 3
+#define HID_SET_REPORT 9
+#define HID_SET_IDLE 10
+#define HID_SET_PROTOCOL 11
+// CDC (communication class device)
+#define CDC_SET_LINE_CODING 0x20
+#define CDC_GET_LINE_CODING 0x21
+#define CDC_SET_CONTROL_LINE_STATE 0x22
+#endif
+#endif

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