arduino.c File Reference

#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"

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Functions
static int	arduino_read_sig_bytes (PROGRAMMER *pgm, AVRPART *p, AVRMEM *m)
static int	prusa_init_external_flash (PROGRAMMER *pgm)
static int	arduino_open (PROGRAMMER *pgm, char *port)
static void	arduino_close (PROGRAMMER *pgm)
void	arduino_initpgm (PROGRAMMER *pgm)

Variables
const char	arduino_desc [] = "Arduino programmer"

Function Documentation

arduino_close()

static void arduino_close ( PROGRAMMER *  pgm )

static

{
  serial_set_dtr_rts(&pgm->fd, 0);
  serial_close(&pgm->fd);
  pgm->fd.ifd = -1;
}

References programmer_t::fd, filedescriptor::ifd, pgm, serial_close, and serial_set_dtr_rts.

Referenced by arduino_initpgm().

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arduino_initpgm()

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;
}

References arduino_close(), arduino_open(), arduino_read_sig_bytes(), programmer_t::close, programmer_t::open, pgm, programmer_t::read_sig_bytes, stk500_initpgm(), and programmer_t::type.

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arduino_open()

static int arduino_open ( PROGRAMMER *  pgm, char *  port  )

static

{
  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 unsigned 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) {
    serial_close(&pgm->fd);
    return -1;
  }
 
  return 0;
}

References avrdude_message(), pinfo::baud, programmer_t::baudrate, programmer_t::fd, MSG_INFO, pgm, programmer_t::port, progname, prusa_init_external_flash(), serial_close, serial_open, serial_send, serial_set_dtr_rts, stk500_drain(), stk500_getsync(), and usleep().

Referenced by arduino_initpgm().

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arduino_read_sig_bytes()

static int arduino_read_sig_bytes ( PROGRAMMER *  pgm, AVRPART *  p, AVRMEM *  m  )

static

{
  unsigned char buf[32];
  (void)p;
 
  /* 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;
}

References avrdude_message(), avrmem::buf, Cmnd_STK_READ_SIGN, programmer_t::fd, MSG_INFO, pgm, progname, Resp_STK_INSYNC, Resp_STK_NOSYNC, Resp_STK_OK, serial_recv, serial_send, avrmem::size, Sync_CRC_EOP, and void().

Referenced by arduino_initpgm().

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prusa_init_external_flash()

static int prusa_init_external_flash ( PROGRAMMER *  pgm )

static

{
  // Note: send/receive as in _the firmare_ send & receives
  const char entry_magic_send[]             = "start\n";
  const unsigned 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, (unsigned char *)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, (unsigned char *)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;
}

References avrdude_message(), programmer_t::fd, MSG_INFO, pgm, progname, serial_recv, and serial_send.

Referenced by arduino_open().

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Variable Documentation

arduino_desc

const char arduino_desc[] = "Arduino programmer"