adding spi01 example.

spi01/Makefile

@@ -12,11 +12,17 @@ clean :
 	rm -f *.elf
 	rm -f *.list
 	rm -f *.img
+	rm -f *.bc
+	rm -f *.opt.s
+	rm -f *.norm.s
+	rm -f blinker01.s.*
+	rm -f blinker02.s.*
+	rm -f dumphex
 
 novectors.o : novectors.s
 	$(ARMGNU)-as novectors.s -o novectors.o
 
-spi01.o : spi01.c
+spi01.o : spi01.c blinker.h
 	$(ARMGNU)-gcc $(COPS) -c spi01.c -o spi01.o
 
 spi01.elf : memmap novectors.o spi01.o 
@@ -30,3 +36,19 @@ spi01.hex : spi01.elf
 	$(ARMGNU)-objcopy spi01.elf -O ihex spi01.hex
 
 
+dumphex : dumphex.c
+	gcc -o dumphex dumphex.c
+
+blinker.h : blinker02.s 
+	gcc -o dumphex dumphex.c
+	avra -fI blinker02.s
+	./dumphex blinker02.s.hex
+
+
+blinker01.s.hex : blinker01.s
+	avra -fI blinker01.s
+
+blinker02.s.hex : blinker02.s
+	avra -fI blinker02.s
+
+

spi01/README

@@ -7,4 +7,60 @@ these programs.
 See the top level README for information on how to connect the raspi
 uart to your host computer.
 
-This is a work in progress, learning how to use the spi master.
+This example is using the raspberry pi as an AVR ISP.
+
+The AVR board used initially is the Sparkfun pro micro 8Mhz/3.3v
+
+http://www.sparkfun.com/products/10999
+
+From an AVR document the chips with this serial isp are either byte
+mode or page mode.  This chip atmega32u4 is page mode so you load a
+temporary buffer with 64 instructions, then send one command to program
+that buffer into a page of flash.
+
+The serial protocol is quite trivial so writing code to use it or modify
+this program is simple.
+
+At this time the code only supports one page/buffer, 64 instructions.
+
+At this time not worrying about exact timing, it works with count to
+N loops.
+
+Raspberry pi interesting pins
+
+//GPIO7  SPI0_CE1_N  P1-26
+//GPIO8  SPI0_CE0_N  P1-24
+//GPIO9  SPI0_MISO   P1-21
+//GPIO10 SPI0_MOSI   P1-19
+//GPIO11 SPI0_SCLK   P1-23
+//alt function 0 for all of the above
+
+//P1 1  +3V3
+//P1 25  GND
+//p1 26  GPIO_CE1
+
+Pro micro to raspi
+
+(GND)              P1-25 GND
+(RST)              P1-26 CE1_N
+(VCC)              P1-1  +3V3
+(15) SCK  JP6-9    P1-23 SCLK
+(14) MISO JP6-10   P1-21 MISO
+(16) MOSI JP6-11   P1-19 MOSI
+
+The ATmega32U4 breakout board has a cluster of 6 pins (an AVR ISP header)
+with all 6 labelled, you connect the raspberry pi signals (right side
+of table above) to those six pins, nothing else.  That breakout board
+does not have an led at least not in the same place so you would have
+to add one or use a scope or meter to see the I/O pin toggle after
+programming.
+
+The AVR doesnt use the chip select for communication, so I support CS0
+but didnt wire it.  The AVR is strange in that way, it does need the
+chip held in reset so I abused CS1 (CE1_N) and mucked with its
+non-asserted state as if it were a gpio pin to assert and deassert reset
+on the AVR.  Normal spi stuff derived from this example should use CE0_N
+(CS0).
+
+The avr samples use the avra assembler apt-get install avra
+

spi01/blinker.h

@@ -0,0 +1,27 @@
+
+const unsigned short rom[0x80]=
+{
+ 0xC000, //00000000
+ 0xE000, //00000001
+ 0xBD04, //00000002
+ 0xE005, //00000003
+ 0xBD05, //00000004
+ 0xE001, //00000005
+ 0xB904, //00000006
+ 0xE010, //00000007
+ 0xE041, //00000008
+ 0xEF20, //00000009
+ 0xB516, //0000000A
+ 0x3010, //0000000B
+ 0xF7E9, //0000000C
+ 0xB516, //0000000D
+ 0x3010, //0000000E
+ 0xF3E9, //0000000F
+ 0x9523, //00000010
+ 0x3020, //00000011
+ 0xF7B9, //00000012
+ 0x2704, //00000013
+ 0xB905, //00000014
+ 0xCFF3, //00000015
+};
+

spi01/blinker01.s

@@ -0,0 +1,34 @@
+.device ATmega168
+.equ  DDRB       = 0x04
+.equ  PORTB      = 0x05
+
+.org 0x0000
+    rjmp RESET
+
+RESET:
+    ldi R16,0x01
+    out DDRB,R16
+
+    ldi R18,0x00
+    ldi R17,0x00
+    ldi R20,0x01
+Loop:
+
+    ldi R19,0xE8
+aloop:
+    inc R17
+    cpi R17,0x00
+    brne aloop
+
+    inc R18
+    cpi R18,0x00
+    brne aloop
+
+    inc R19
+    cpi R19,0x00
+    brne aloop
+
+    eor R16,R20
+    out PORTB, R16
+    rjmp Loop
+

spi01/blinker02.s

@@ -0,0 +1,53 @@
+
+.device ATmega168
+
+.equ  DDRB       = 0x04
+.equ  PORTB      = 0x05
+.equ  TCCR0A     = 0x24
+.equ  TCCR0B     = 0x25
+.equ  TCNT0      = 0x26
+
+;.equ  CLKPR      = 0x61
+
+.org 0x0000
+    rjmp RESET
+
+RESET:
+
+;    ldi r16,0x80
+;    ldi r17,0x00
+;    sts CLKPR,r16
+;    sts CLKPR,r17
+
+
+    ldi R16,0x00
+    out TCCR0A,R16
+    ldi R16,0x05
+    out TCCR0B,R16
+
+    ldi R16,0x01
+    out DDRB,R16
+
+    ldi R17,0x00
+    ldi R20,0x01
+Loop:
+
+
+    ldi R18,0xF0 ;; change this to change the blink rate
+aloop:
+    in R17,TCNT0
+    cpi R17,0x00
+    brne aloop
+
+bloop:
+    in R17,TCNT0
+    cpi R17,0x00
+    breq bloop
+
+    inc R18
+    cpi R18,0x00
+    brne aloop
+
+    eor R16,R20
+    out PORTB, R16
+    rjmp Loop