337 lines
6.8 KiB
C
337 lines
6.8 KiB
C
/* MSPDebug - debugging tool for the eZ430
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* Copyright (C) 2009, 2010 Daniel Beer
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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, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <string.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <unistd.h>
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#include "device.h"
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#include "util.h"
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static int serial_fd;
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#define DATA_HDR 0x80
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#define DATA_ACK 0x90
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#define DATA_NAK 0xA0
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static int bsl_ack(void)
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{
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u_int8_t reply;
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if (read_with_timeout(serial_fd, &reply, 1) < 0) {
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fprintf(stderr, "bsl: failed to receive reply\n");
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return -1;
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}
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if (reply == DATA_NAK) {
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fprintf(stderr, "bsl: received NAK\n");
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return -1;
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}
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if (reply != DATA_ACK) {
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fprintf(stderr, "bsl: bad ack character: %x\n", reply);
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return -1;
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}
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return 0;
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}
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static int bsl_sync(void)
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{
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static const u_int8_t c = DATA_HDR;
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int tries = 2;
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if (tcflush(serial_fd, TCIFLUSH) < 0) {
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perror("bsl: tcflush");
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return -1;
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}
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while (tries--)
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if (!(write_all(serial_fd, &c, 1) || bsl_ack()))
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return 0;
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fprintf(stderr, "bsl: sync failed\n");
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return -1;
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}
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static int send_command(int code, u_int16_t addr,
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const u_int8_t *data, int len)
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{
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u_int8_t pktbuf[256];
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u_int8_t cklow = 0xff;
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u_int8_t ckhigh = 0xff;
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int pktlen = data ? len + 4 : 4;
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int i;
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if (pktlen + 6 > sizeof(pktbuf)) {
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fprintf(stderr, "bsl: payload too large: %d\n", len);
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return -1;
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}
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pktbuf[0] = DATA_HDR;
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pktbuf[1] = code;
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pktbuf[2] = pktlen;
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pktbuf[3] = pktlen;
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pktbuf[4] = addr & 0xff;
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pktbuf[5] = addr >> 8;
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pktbuf[6] = len & 0xff;
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pktbuf[7] = len >> 8;
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if (data)
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memcpy(pktbuf + 8, data, len);
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for (i = 0; i < pktlen + 4; i += 2)
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cklow ^= pktbuf[i];
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for (i = 1; i < pktlen + 4; i += 2)
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ckhigh ^= pktbuf[i];
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pktbuf[pktlen + 4] = cklow;
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pktbuf[pktlen + 5] = ckhigh;
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return write_all(serial_fd, pktbuf, pktlen + 6);
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}
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static u_int8_t reply_buf[256];
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static int reply_len;
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static int verify_checksum(void)
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{
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u_int8_t cklow = 0xff;
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u_int8_t ckhigh = 0xff;
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int i;
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for (i = 0; i < reply_len; i += 2)
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cklow ^= reply_buf[i];
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for (i = 1; i < reply_len; i += 2)
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ckhigh ^= reply_buf[i];
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if (cklow || ckhigh) {
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fprintf(stderr, "bsl: checksum invalid (%02x %02x)\n",
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cklow, ckhigh);
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return -1;
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}
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return 0;
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}
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static int fetch_reply(void)
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{
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reply_len = 0;
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for (;;) {
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int r = read_with_timeout(serial_fd, reply_buf + reply_len,
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sizeof(reply_buf) - reply_len);
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if (r < 0)
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return -1;
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reply_len += r;
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if (reply_buf[0] == DATA_ACK) {
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return 0;
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} else if (reply_buf[0] == DATA_HDR) {
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if (reply_len >= 6 &&
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reply_len == reply_buf[2] + 6)
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return verify_checksum();
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} else if (reply_buf[0] == DATA_NAK) {
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fprintf(stderr, "bsl: received NAK\n");
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return -1;
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} else {
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fprintf(stderr, "bsl: unknown reply type: %02x\n",
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reply_buf[0]);
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return -1;
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}
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if (reply_len >= sizeof(reply_buf)) {
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fprintf(stderr, "bsl: reply buffer overflow\n");
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return -1;
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}
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}
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}
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static int bsl_xfer(int command_code, u_int16_t addr, const u_int8_t *txdata,
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int len)
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{
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if (bsl_sync() < 0 ||
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send_command(command_code, addr, txdata, len) < 0 ||
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fetch_reply() < 0) {
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fprintf(stderr, "bsl: failed on command 0x%02x "
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"(addr = 0x%04x, len = 0x%04x)\n",
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command_code, addr, len);
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return -1;
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}
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return 0;
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}
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#define CMD_TX_DATA 0x38
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#define CMD_ERASE 0x39
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#define CMD_RX_DATA 0x3a
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#define CMD_RESET 0x3b
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static void bsl_close(void)
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{
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bsl_xfer(CMD_RESET, 0, NULL, 0);
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close(serial_fd);
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}
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static int bsl_control(device_ctl_t type)
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{
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fprintf(stderr, "bsl: CPU control is not implemented\n");
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return -1;
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}
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static int bsl_wait(void)
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{
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return 0;
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}
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static int bsl_breakpoint(u_int16_t addr)
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{
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fprintf(stderr, "bsl: breakpoints are not implemented\n");
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return -1;
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}
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static int bsl_getregs(u_int16_t *regs)
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{
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fprintf(stderr, "bsl: register fetch is not implemented\n");
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return -1;
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}
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static int bsl_setregs(const u_int16_t *regs)
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{
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fprintf(stderr, "bsl: register store is not implemented\n");
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return -1;
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}
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static int bsl_writemem(u_int16_t addr, const u_int8_t *mem, int len)
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{
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fprintf(stderr, "bsl: memory write is not implemented\n");
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return -1;
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}
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static int bsl_readmem(u_int16_t addr, u_int8_t *mem, int len)
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{
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while (len) {
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int count = len;
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if (count > 128)
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count = 128;
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if (bsl_xfer(CMD_TX_DATA, addr, NULL, count) < 0) {
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fprintf(stderr, "bsl: failed to read memory\n");
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return -1;
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}
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if (count > reply_buf[2])
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count = reply_buf[2];
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memcpy(mem, reply_buf + 4, count);
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mem += count;
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len -= count;
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}
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return 0;
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}
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const static struct device bsl_device = {
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.close = bsl_close,
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.control = bsl_control,
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.wait = bsl_wait,
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.breakpoint = bsl_breakpoint,
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.getregs = bsl_getregs,
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.setregs = bsl_setregs,
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.writemem = bsl_writemem,
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.readmem = bsl_readmem
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};
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#include <sys/ioctl.h>
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static int enter_via_fet(void)
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{
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u_int8_t buf[16];
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u_int8_t *data = buf;
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int len = 8;
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/* Enter bootloader command */
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if (write_all(serial_fd, (u_int8_t *)"\x7e\x24\x01\x9d\x5a\x7e", 6)) {
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fprintf(stderr, "bsl: couldn't write bootloader transition "
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"command\n");
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return -1;
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}
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/* Wait for reply */
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while (len) {
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int r = read_with_timeout(serial_fd, data, len);
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if (r < 0) {
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fprintf(stderr, "bsl: couldn't read bootloader "
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"transition acknowledgement\n");
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return -1;
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}
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data += r;
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len -= r;
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}
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/* Check that it's what we expect */
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if (memcmp(buf, "\x06\x00\x24\x00\x00\x00\x61\x01", 8)) {
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fprintf(stderr, "bsl: bootloader start returned error %d\n",
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buf[5]);
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return -1;
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}
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return 0;
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}
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const struct device *bsl_open(const char *device)
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{
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serial_fd = open_serial(device, B460800);
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if (serial_fd < 0) {
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fprintf(stderr, "bsl: can't open %s: %s\n",
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device, strerror(errno));
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return NULL;
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}
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if (enter_via_fet() < 0)
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return NULL;
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usleep(500000);
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/* Show chip info */
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if (bsl_xfer(CMD_TX_DATA, 0xff0, NULL, 0x10) < 0) {
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fprintf(stderr, "bsl: failed to read chip info\n");
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return NULL;
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}
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if (reply_len < 0x16) {
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fprintf(stderr, "bsl: missing chip info\n");
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return NULL;
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}
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print_devid((reply_buf[4] << 8) | reply_buf[5]);
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printf("BSL version is %x.%02x\n", reply_buf[14], reply_buf[15]);
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return &bsl_device;
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}
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