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Serial2Parallel.ino
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Serial2Parallel.ino
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/* Maximum speed USB Serial to Parallel Output
* http://www.pjrc.com/teensy/
* Copyright (c) 2012 Paul Stoffregen, PJRC.COM, LLC (paul@pjrc.com)
*
* This highly optimized example was inspired by Phillip Burgess's work at
* (http://www.paintyourdragon.com) with Adafruit's LPD light strips.
*
* Development of this code was funded by PJRC, from sales of Teensy boards.
* While you may use this code for any purpose, please consider buying Teensy,
* to support more optimization work in the future. :-)
*
* 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.
*/
// This example converts USB Serial to 8 bit parallel data. The computer MUST
// transmit in multiples of 64 bytes. The data bits are output on port D and
// clock signals are output in port B.
#include "usb_private.h"
void setup() {
for (int i=0; i < NUM_DIGITAL_PINS; i++) {
pinMode(i, OUTPUT);
}
}
void loop() {
moveDataReallyFast(0xFF, 0x00);
}
// these delays allow for more reliable transmission on long wires
// 6 total "nop" are recommended for best speed
// 9 total may still allow max speed, if you're lucky...
// more than 9 will slow the speed
#define Setup() asm volatile("nop\nnop\nnop\n") // setup time before rising edge
#define Hold() asm volatile("nop\nnop\n") // hold time after falling edge
#define Pulse() asm volatile("nop\n") // lengthen clock pulse width
/*
#define Setup() asm volatile("nop\nnop\nnop\n") // setup time before rising edge
#define Hold() asm volatile("nop\nnop\nnop\n") // hold time after falling edge
#define Pulse() asm volatile("nop\nnop\nnop\n") // lengthen clock pulse width
*/
/*
here are the details form the fastspi library:
if(FastSPI_LED.m_eChip == CFastSPI_LED::SPI_WS2801)
// If we haven't run through yet - nothing has primed the SPI bus,
// and the first SPI_B will block.
if(!run) {
run = 1;
SPI_A(*p++);
SPI_B; SPI_A(*p++);
SPI_B; SPI_A(*p++);
}
while(p != e) {
SPI_B; SPI_A(*p++);
SPI_B; SPI_A(*p++);
SPI_B; SPI_A(*p++);
}
else if(FastSPI_LED.m_eChip == CFastSPI_LED::SPI_LPD8806)
// The LPD8806 requires the high bit to be set
while(p != e) {
SPI_B; SPI_A( *p++ >> 1 | 0x80);
SPI_B; SPI_A( *p++ >> 1 | 0x80);
SPI_B; SPI_A( *p++ >> 1 | 0x80);
}
// Latch out our 0's to set the data stream
int n = (m_nLeds + 191 )/ 192;
while(n--) {
SPI_B; SPI_A(0);
SPI_B; SPI_A(0);
SPI_B; SPI_A(0);
}
*/
void moveDataReallyFast(byte strobeOn, byte strobeOff)
{
unsigned char c;
if (!usb_configuration) return;
UENUM = CDC_RX_ENDPOINT;
while (1) {
c = UEINTX;
if (!(c & (1<<RWAL))) {
// no data in buffer
if (c & (1<<RXOUTI)) {
UEINTX = 0x6B;
}
return;
}
c = UEDATX; // take one byte out of the buffer, eead byte 0
PORTD = c; //DATA
Setup();
PORTB = strobeOn; //CLK
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //3
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //4
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //6
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //7
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //8
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //10
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //12
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //14
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //18
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //20
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //23
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //26
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //29
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //32
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //33
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //35
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //37
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //38
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //40
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //43
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //45
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //47
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //50
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //53
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //56
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //60
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX;
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
c = UEDATX; //63
Pulse();
PORTB = strobeOff;
Hold();
PORTD = c;
Setup();
PORTB = strobeOn;
// Release the USB buffer
UEINTX = 0x6B;
Pulse();
PORTB = strobeOff;
}
}
#if !defined (CORE_TEENSY_SERIAL)
#error "This program was designed for Teensy 2.0 using Tools > USB Type set to Serial. Please set the Tools > Board to Teensy 2.0 and USB Type to Serial, or delete this error to try using a different board."
#endif