130 lines
3.3 KiB
C
130 lines
3.3 KiB
C
/*
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* avrdude - A Downloader/Uploader for AVR device programmers
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* Copyright (C) 2009 Lars Immisch
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* $Id$ */
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/*
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* avrdude interface for Arduino programmer
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*
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* The Arduino programmer is mostly a STK500v1, just the signature bytes
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* are read differently.
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*/
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#include "ac_cfg.h"
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include "avrdude.h"
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#include "libavrdude.h"
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#include "stk500_private.h"
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#include "stk500.h"
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#include "arduino.h"
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/* read signature bytes - arduino version */
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static int arduino_read_sig_bytes(const PROGRAMMER *pgm, const AVRPART *p, const AVRMEM *m) {
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unsigned char buf[32];
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/* Signature byte reads are always 3 bytes. */
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if (m->size < 3) {
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pmsg_error("memsize too small for sig byte read");
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return -1;
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}
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buf[0] = Cmnd_STK_READ_SIGN;
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buf[1] = Sync_CRC_EOP;
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serial_send(&pgm->fd, buf, 2);
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if (serial_recv(&pgm->fd, buf, 5) < 0)
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return -1;
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if (buf[0] == Resp_STK_NOSYNC) {
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pmsg_error("programmer is out of sync\n");
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return -1;
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} else if (buf[0] != Resp_STK_INSYNC) {
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msg_error("\n");
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pmsg_error("protocol expects sync byte 0x%02x but got 0x%02x\n", Resp_STK_INSYNC, buf[0]);
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return -2;
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}
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if (buf[4] != Resp_STK_OK) {
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msg_error("\n");
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pmsg_error("protocol expects OK byte 0x%02x but got 0x%02x\n", Resp_STK_OK, buf[4]);
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return -3;
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}
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m->buf[0] = buf[1];
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m->buf[1] = buf[2];
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m->buf[2] = buf[3];
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return 3;
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}
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static int arduino_open(PROGRAMMER *pgm, const char *port) {
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union pinfo pinfo;
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strcpy(pgm->port, port);
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pinfo.serialinfo.baud = pgm->baudrate? pgm->baudrate: 115200;
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pinfo.serialinfo.cflags = SERIAL_8N1;
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if (serial_open(port, pinfo, &pgm->fd)==-1) {
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return -1;
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}
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/* Clear DTR and RTS to unload the RESET capacitor
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* (for example in Arduino) */
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serial_set_dtr_rts(&pgm->fd, 0);
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usleep(250*1000);
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/* Set DTR and RTS back to high */
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serial_set_dtr_rts(&pgm->fd, 1);
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usleep(50*1000);
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/*
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* drain any extraneous input
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*/
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stk500_drain(pgm, 0);
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if (stk500_getsync(pgm) < 0)
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return -1;
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return 0;
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}
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static void arduino_close(PROGRAMMER * pgm)
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{
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serial_set_dtr_rts(&pgm->fd, 0);
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serial_close(&pgm->fd);
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pgm->fd.ifd = -1;
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}
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const char arduino_desc[] = "Arduino programmer";
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void arduino_initpgm(PROGRAMMER *pgm) {
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/* This is mostly a STK500; just the signature is read
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differently than on real STK500v1
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and the DTR signal is set when opening the serial port
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for the Auto-Reset feature */
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stk500_initpgm(pgm);
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strcpy(pgm->type, "Arduino");
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pgm->read_sig_bytes = arduino_read_sig_bytes;
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pgm->open = arduino_open;
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pgm->close = arduino_close;
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disable_trailing_ff_removal(); /* so that arduino bootloader can ignore chip erase */
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}
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