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/* MSPDebug - debugging tool for MSP430 MCUs
* Copyright (C) 2009-2013 Daniel Beer
*
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <string.h>
#include "util.h"
#include "output.h"
#include "hal_proto.h"
void hal_proto_init(struct hal_proto *p, transport_t trans,
hal_proto_flags_t flags)
{
memset(p, 0, sizeof(*p));
p->trans = trans;
p->flags = flags;
p->ref_id = 0;
}
int hal_proto_send(struct hal_proto *p, hal_proto_type_t type,
const uint8_t *data, int length)
{
uint8_t buf[512];
size_t len = 0;
if (length > HAL_MAX_PAYLOAD) {
printc_err("hal_proto_send: payload too long: %d\n", length);
return -1;
}
buf[len++] = length + 3;
buf[len++] = type;
buf[len++] = p->ref_id;
buf[len++] = 0;
p->ref_id = (p->ref_id + 1) & 0x7f;
memcpy(buf + len, data, length);
len += length;
if (len & 1)
buf[len++] = 0;
if (p->flags & HAL_PROTO_CHECKSUM) {
size_t i;
uint8_t sum_l = 0xff;
uint8_t sum_h = 0xff;
for (i = 0; i < len; i += 2) {
sum_l ^= buf[i];
sum_h ^= buf[i + 1];
}
buf[len++] = sum_l;
buf[len++] = sum_h;
}
if (p->trans->ops->send(p->trans, buf, len) < 0) {
printc_err("hal_proto_send: type: 0x%02x\n", type);
return -1;
}
return 0;
}
int hal_proto_receive(struct hal_proto *p, uint8_t *buf, int max_len)
{
uint8_t rx_buf[512];
uint8_t sum_h = 0xff;
uint8_t sum_l = 0xff;
int rx_len = 0;
int len;
int i;
for (;;) {
int r = p->trans->ops->recv(p->trans, rx_buf + rx_len,
sizeof(rx_buf) - rx_len);
if (r <= 0) {
printc_err("hal_proto_recv: read error\n");
return -1;
}
rx_len += r;
if (rx_len) {
const size_t expect_len =
rx_buf[0] + 4 - (rx_buf[0] & 1);
if (rx_len == expect_len)
break;
if (rx_len > expect_len) {
printc_err("hal_proto_recv: length "
"mismatch\n");
return -1;
}
}
}
if (rx_len < 6) {
printc_err("hal_proto_recv: short read: %d\n", rx_len);
return -1;
}
for (i = 0; i < rx_len; i += 2) {
sum_h ^= rx_buf[i];
sum_l ^= rx_buf[i + 1];
}
if (sum_h || sum_l) {
printc_err("hal_proto_recv: bad checksum\n");
return -1;
}
len = rx_buf[0] - 3;
p->type = rx_buf[1];
p->ref = rx_buf[2];
p->seq = rx_buf[3];
if (len > max_len) {
printc_err("hal_proto_recv: reply too long\n");
return -1;
}
memcpy(buf, rx_buf + 4, len);
return len;
}
int hal_proto_execute(struct hal_proto *p, uint8_t fid,
const uint8_t *data, int len)
{
uint8_t fdata[HAL_MAX_PAYLOAD];
if (len + 2 > HAL_MAX_PAYLOAD) {
printc_err("hal_proto_execute: payload too big: %d\n", len);
return -1;
}
fdata[0] = fid;
fdata[1] = 0;
memcpy(fdata + 2, data, len);
if (hal_proto_send(p, HAL_PROTO_TYPE_CMD_EXECUTE, fdata, len + 2) < 0)
goto fail;
p->length = 0;
do {
int r = hal_proto_receive(p, p->payload + p->length,
sizeof(p->payload) - p->length);
if (r < 0)
goto fail;
if ((p->type == HAL_PROTO_TYPE_EXCEPTION) && (r >= 2)) {
printc_err("hal_proto_execute: HAL exception: 0x%04x\n",
LE_WORD(p->payload, p->length));
goto fail;
}
if (p->type == HAL_PROTO_TYPE_ACKNOWLEDGE)
break;
if (p->type != HAL_PROTO_TYPE_DATA) {
printc_err("hal_proto_execute: no data "
"(got type 0x%02x)\n", p->type);
goto fail;
}
if (hal_proto_send(p, HAL_PROTO_TYPE_ACKNOWLEDGE, NULL, 0) < 0)
goto fail;
p->length += r;
} while (p->ref & 0x80);
return 0;
fail:
printc_err("hal_proto_execute: fid: 0x%02x\n", fid);
return -1;
}
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