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/*
* avrdude - A Downloader/Uploader for AVR device programmers
* Copyright (C) 2009 Lars Immisch
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/* $Id$ */
/*
* avrdude interface for Arduino programmer
*
* The Arduino programmer is mostly a STK500v1, just the signature bytes
* are read differently.
*/
#include "ac_cfg.h"
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include "avrdude.h"
#include "libavrdude.h"
#include "stk500_private.h"
#include "stk500.h"
#include "arduino.h"
/* read signature bytes - arduino version */
static int arduino_read_sig_bytes(PROGRAMMER * pgm, AVRPART * p, AVRMEM * m)
{
unsigned char buf[32];
/* Signature byte reads are always 3 bytes. */
if (m->size < 3) {
avrdude_message(MSG_INFO, "%s: memsize too small for sig byte read", progname);
return -1;
}
buf[0] = Cmnd_STK_READ_SIGN;
buf[1] = Sync_CRC_EOP;
serial_send(&pgm->fd, buf, 2);
if (serial_recv(&pgm->fd, buf, 5) < 0)
return -1;
if (buf[0] == Resp_STK_NOSYNC) {
avrdude_message(MSG_INFO, "%s: stk500_cmd(): programmer is out of sync\n",
progname);
return -1;
} else if (buf[0] != Resp_STK_INSYNC) {
avrdude_message(MSG_INFO, "\n%s: arduino_read_sig_bytes(): (a) protocol error, "
"expect=0x%02x, resp=0x%02x\n",
progname, Resp_STK_INSYNC, buf[0]);
return -2;
}
if (buf[4] != Resp_STK_OK) {
avrdude_message(MSG_INFO, "\n%s: arduino_read_sig_bytes(): (a) protocol error, "
"expect=0x%02x, resp=0x%02x\n",
progname, Resp_STK_OK, buf[4]);
return -3;
}
m->buf[0] = buf[1];
m->buf[1] = buf[2];
m->buf[2] = buf[3];
return 3;
}
static int prusa_init_external_flash(PROGRAMMER * pgm)
{
// Note: send/receive as in _the firmare_ send & receives
const char entry_magic_send [] = "start\n";
const char entry_magic_receive[] = "w25x20cl_enter\n";
const char entry_magic_cfm [] = "w25x20cl_cfm\n";
const size_t buffer_len = 32; // Should be large enough for the above messages
int res;
size_t recv_size;
char *buffer = alloca(buffer_len);
// 1. receive the "start" command
recv_size = sizeof(entry_magic_send) - 1;
res = serial_recv(&pgm->fd, buffer, recv_size);
if (res < 0) {
avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): MK3 printer did not boot up on time or serial communication failed\n", progname);
return -1;
} else if (strncmp(buffer, entry_magic_send, recv_size) != 0) {
avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): MK3 printer emitted incorrect start code: `%*s`\n", progname, recv_size, buffer);
return -1;
}
// 2. Send the external flash programmer enter command
if (serial_send(&pgm->fd, entry_magic_receive, sizeof(entry_magic_receive) - 1) < 0) {
avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): Failed to send command to the printer\n",progname);
return -1;
}
// 3. Receive the entry confirmation command
recv_size = sizeof(entry_magic_cfm) - 1;
res = serial_recv(&pgm->fd, buffer, recv_size);
if (res < 0) {
avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): MK3 printer did not boot up on time or serial communication failed\n", progname);
return -1;
} else if (strncmp(buffer, entry_magic_cfm, recv_size) != 0) {
avrdude_message(MSG_INFO, "%s: prusa_init_external_flash(): MK3 printer emitted incorrect cfm code: `%*s`\n", progname, recv_size, buffer);
return -1;
}
return 0;
}
static int arduino_open(PROGRAMMER * pgm, char * port)
{
union pinfo pinfo;
strcpy(pgm->port, port);
pinfo.baud = pgm->baudrate? pgm->baudrate: 115200;
if (serial_open(port, pinfo, &pgm->fd)==-1) {
return -1;
}
/* Clear DTR and RTS to unload the RESET capacitor
* (for example in Arduino) */
serial_set_dtr_rts(&pgm->fd, 0);
usleep(250*1000);
/* Set DTR and RTS back to high */
serial_set_dtr_rts(&pgm->fd, 1);
usleep(50*1000);
// Sometimes there may be line noise generating input on the printer's USB-to-serial IC
// Here we try to clean its input buffer with a sequence of newlines (a minimum of 9 is needed):
const char cleanup_newlines[] = "\n\n\n\n\n\n\n\n\n\n";
if (serial_send(&pgm->fd, cleanup_newlines, sizeof(cleanup_newlines) - 1) < 0) {
return -1;
}
/*
* drain any extraneous input
*/
stk500_drain(pgm, 0);
// Initialization sequence for programming the external FLASH on the Prusa MK3
if (prusa_init_external_flash(pgm) < 0) {
avrdude_message(MSG_INFO, "%s: arduino_open(): Failed to initialize MK3 external flash programming mode\n", progname);
return -1;
}
if (stk500_getsync(pgm) < 0)
return -1;
return 0;
}
static void arduino_close(PROGRAMMER * pgm)
{
serial_set_dtr_rts(&pgm->fd, 0);
serial_close(&pgm->fd);
pgm->fd.ifd = -1;
}
const char arduino_desc[] = "Arduino programmer";
void arduino_initpgm(PROGRAMMER * pgm)
{
/* This is mostly a STK500; just the signature is read
differently than on real STK500v1
and the DTR signal is set when opening the serial port
for the Auto-Reset feature */
stk500_initpgm(pgm);
strcpy(pgm->type, "Arduino");
pgm->read_sig_bytes = arduino_read_sig_bytes;
pgm->open = arduino_open;
pgm->close = arduino_close;
}
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