It appears that there's a way to communicate to AVR MCU's, which
is not yet covered by avrdude: a “serial port to SPI” interface.
I wonder if it's possible to add support for such a “programmer”
to avrdude? A preliminary patch is MIME'd. At the very least,
it seems to work with the interface I have at hand.
--
FSF associate member #7257
Index: Makefile.am
===================================================================
--- Makefile.am (revision 1118)
+++ Makefile.am (working copy)
@@ -145,6 +145,8 @@
serbb.h \
serbb_posix.c \
serbb_win32.c \
+ serspi.h \
+ serspi.c \
ser_avrdoper.c \
ser_posix.c \
ser_win32.c \
Index: pgm_type.c
===================================================================
--- pgm_type.c (revision 1118)
+++ pgm_type.c (working copy)
@@ -42,6 +42,7 @@
#include "pickit2.h"
#include "ppi.h"
#include "serbb.h"
+#include "serspi.h"
#include "stk500.h"
#include "stk500generic.h"
#include "stk500v2.h"
@@ -76,6 +77,7 @@
{"par", par_initpgm, par_desc},
{"pickit2", pickit2_initpgm, pickit2_desc},
{"serbb", serbb_initpgm, serbb_desc},
+ {"serspi", serspi_initpgm, serspi_desc},
{"stk500", stk500_initpgm, stk500_desc},
{"stk500generic", stk500generic_initpgm, stk500generic_desc},
{"stk500v2", stk500v2_initpgm, stk500v2_desc},
/*** serspi.c --- UART to SPI converter support for avrdude -*- C -*- */
/*** Ivan Shmakov, 2012 */
/** To the extent possible under law, the author(s) have dedicated all
** copyright and related and neighboring rights to this software to the
** public domain worldwide. This software is distributed without any
** warranty.
**
** You should have received a copy of the CC0 Public Domain Dedication
** along with this software. If not, see
** <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
/*** Code: */
#include "ac_cfg.h"
#include <assert.h> /* for assert () */
#include <stdio.h> /* for fprintf () */
#include <string.h> /* for memcpy () */
#include "avrdude.h"
#include "avr.h"
#include "config.h"
#include "pgm.h"
#include "serspi.h"
#include "serial.h"
static void
do_nothing ()
{
/* do nothing */
}
static int
serspi_open (PROGRAMMER *pgm, char *port)
{
int brate
= pgm->baudrate;
if (brate == 0) {
fprintf (stderr, "%s: baud rate not set; set with -b\n",
progname);
/* . */
return -1;
}
/* FIXME: check for possible overflow */
strcpy (pgm->port, port);
if (serial_open (port, brate, &(pgm->fd)) == -1) {
/* . */
return -1;
}
/* flush input */
serial_drain (&(pgm->fd), 0);
/* . */
return 0;
}
static void
serspi_close (PROGRAMMER *pgm)
{
serial_close (&(pgm->fd));
pgm->fd.ifd
= -1;
/* . */
}
static int
serspi_cmd (PROGRAMMER *pgm,
unsigned char cmd[4],
unsigned char res[4])
{
int i;
for (i = 0; i < 4; i++) {
int wr
= serial_send (&pgm->fd, cmd + i, 1);
if (wr != 0) {
/* . */
return -1;
}
int rd
= serial_recv (&pgm->fd, res + i, 1);
if (rd != 0) {
/* . */
return -1;
}
}
if (verbose >= 2) {
fprintf (stderr,
("serspi_cmd ():"
" [ %02X %02X %02X %02X ]"
" [ %02X %02X %02X %02X ]\n"),
cmd[0], cmd[1], cmd[2], cmd[3],
res[0], res[1], res[2], res[3]);
}
/* . */
return 0;
}
static int
serspi_cmd_x (PROGRAMMER *pgm, AVRPART *part,
int cm, unsigned char *cmc, unsigned char *res)
{
OPCODE *op
= part->op[cm];
if (op == 0) {
/* FIXME: isn't there a avr_strop () function? */
fprintf (stderr,
("%s: the %s (%d) instruction not defined"
" for part \"%s\"\n"),
progname,
(cm == AVR_OP_CHIP_ERASE ? "chip erase"
: cm == AVR_OP_PGM_ENABLE ? "programming enable"
: "(unknown)"),
cm,
part->desc);
/* . */
return -1;
}
{
unsigned char cmd[4] = { 0, 0, 0, 0 }, re1[4];
avr_set_bits (op, cmd);
int r
= pgm->cmd (pgm, cmd, re1);
if (r != 0) {
/* . */
return -1;
}
if (cmc != 0) {
memcpy (cmc, cmd, sizeof (cmd));
}
if (res != 0) {
memcpy (res, re1, sizeof (re1));
}
}
/* . */
return 0;
}
static int
serspi_program_enable (PROGRAMMER *pgm, AVRPART *part)
{
/* only SPI parts are supported */
assert ((part->flags & AVRPART_HAS_TPI) == 0);
{
unsigned char cmd[4], res[4];
int r
= serspi_cmd_x (pgm, part, AVR_OP_PGM_ENABLE, cmd, res);
if (r != 0) {
/* . */
return -1;
}
if (res[2] != cmd[1]) {
/* . */
return -2;
}
}
/* . */
return 0;
}
static int
serspi_initialize (PROGRAMMER *pgm, AVRPART *part)
{
/* only SPI parts are supported */
assert ((part->flags & AVRPART_HAS_TPI) == 0);
/* try serspi_program_enable () some 55 times */
int i;
for (i = 0; i < 55; i++) {
int r
= pgm->program_enable (pgm, part);
if (r == 0 || r == -1) {
/* . */
return r;
}
}
fprintf (stderr, "%s: AVR device not responding\n", progname);
/* . */
return -1;
}
static int
serspi_chip_erase (PROGRAMMER *pgm, AVRPART *part)
{
/* only SPI parts are supported */
assert ((part->flags & AVRPART_HAS_TPI) == 0);
{
int r
= serspi_cmd_x (pgm, part, AVR_OP_CHIP_ERASE, 0, 0);
if (r != 0) {
/* . */
return -1;
}
}
/* . */
return
pgm->initialize (pgm, part);
}
const char serspi_desc[]
= "Serial port to SPI converters";
void
serspi_initpgm (PROGRAMMER *p)
{
strcpy (p->type, "serspi");
/* mandatory functions */
p->open = serspi_open;
p->close = serspi_close;
p->cmd = serspi_cmd;
p->program_enable = serspi_program_enable;
p->initialize = serspi_initialize;
p->chip_erase = serspi_chip_erase;
p->disable = do_nothing;
p->display = do_nothing;
p->enable = do_nothing;
/* optional functions */
p->read_byte = avr_read_byte_default;
p->write_byte = avr_write_byte_default;
/* . */
}
/*** serspi.c ends here */
/*** serspi.h --- UART to SPI converter support for avrdude -*- C -*- */
/*** Ivan Shmakov, 2012 */
/** To the extent possible under law, the author(s) have dedicated all
** copyright and related and neighboring rights to this software to the
** public domain worldwide. This software is distributed without any
** warranty.
**
** You should have received a copy of the CC0 Public Domain Dedication
** along with this software. If not, see
** <http://creativecommons.org/publicdomain/zero/1.0/>.
*/
/*** Code: */
#ifndef serspi_h
#define serspi_h
#include "pgm.h" /* for PROGRAMMER */
#ifdef __cplusplus
extern "C" {
#endif
extern const char serspi_desc[];
void serspi_initpgm (PROGRAMMER *pgm);
#ifdef __cplusplus
}
#endif
#endif /* serspi_h */
/*** serspi.h ends here */
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