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lpc111x-isp/lpc111x.c: restructure code (WIP)

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This commit is contained in:
Werner Almesberger 2012-12-28 22:45:26 -03:00
parent eea0484a41
commit 5487578ee7
1 changed files with 113 additions and 20 deletions
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133
lpc111x-isp/lpc111x.c
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@ -15,9 +15,7 @@
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <termios.h>
#include <fcntl.h>
#include <errno.h>
#include <alloca.h>
#include <ubb/ubb.h>
#include <ubb/swuart.h>
@ -31,11 +29,19 @@
#define HOST_RX TGT_TX
#define HOST_TX TGT_RX
#define AUTOBAUD_TRIES 10
#define SYNC "Synchronized"
static void dump(uint8_t *s, int len)
/* ----- Debugging and tracing --------------------------------------------- */
static void trace(const char *label, const uint8_t *s, int len)
{
const uint8_t *end = s+len;
if (label)
printf("%s ", label);
for (end = s+len; s != end; s++) {
if (*s >= ' ' && *s <= '~')
printf("%c", *s);
@ -51,13 +57,94 @@ static void dump(uint8_t *s, int len)
}
static void trace_out(const void *s, int len)
{
trace(">>>", s, len);
}
static void trace_in(const uint8_t *s, int len)
{
trace("<<<", s, len);
}
/* ----- Dialog functions -------------------------------------------------- */
static int dialog(const char *cmd, void *buf, int buf_len, int idle)
{
int cmd_len = strlen(cmd);
char *tx_buf = alloca(cmd_len+3);
uint8_t *rx_buf = alloca(cmd_len+2+buf_len);
int got;
memcpy(tx_buf, cmd, cmd_len);
memcpy(tx_buf+cmd_len, "\r\n", 2);
trace_out(tx_buf, cmd_len+2);
got = swuart_trx(tx_buf, cmd_len+2, rx_buf, cmd_len+2+buf_len,
idle, idle);
if (got < cmd_len+2) {
trace_in(rx_buf, got);
fprintf(stderr, "response too short for echo\n");
exit(1);
}
if (memcmp(rx_buf, cmd, cmd_len) ||
rx_buf[cmd_len] != '\r' || rx_buf[cmd_len+1] != '\n') {
trace_in(rx_buf, got);
fprintf(stderr, "echo mismatch\n");
exit(1);
}
trace_in(rx_buf, cmd_len+2);
got -= cmd_len+2;
memcpy(buf, rx_buf+cmd_len+2, got);
return got;
}
static int autobaud(void)
{
uint8_t reply[100];
int i, got;
for (i = 0; i != AUTOBAUD_TRIES; i++) {
CLR(TGT_nRESET);
usleep(10); /* DS Table 9 pg 29 says min 50 ns */
SET(TGT_nRESET);
usleep(5*1000); /* UM 26.3.1 pg 408 says max 3 ms */
got = swuart_trx("?", 1, reply, sizeof(reply), 1000, 100);
trace_in(reply, got);
if (got != strlen(SYNC)+2 || memcmp(reply, SYNC "\r\n", got))
continue;
got = dialog(SYNC, reply, sizeof(reply), 100);
trace_in(reply, got);
if (got == 4 && !memcmp(reply, "OK\r\n", 4))
return 1;
}
return 0;
}
/* ----- ISP session ------------------------------------------------------- */
static void at_exit(void)
{
ubb_close(0);
}
int main(int argc, char **argv)
static void start_isp(void)
{
uint8_t reply[1000];
int got;
@ -80,26 +167,32 @@ int main(int argc, char **argv)
swuart_open(HOST_TX, HOST_RX, 115200);
CLR(TGT_nRESET);
usleep(10); /* DS Table 9 pg 29 says min 50 ns */
SET(TGT_nRESET);
if (!autobaud()) {
fprintf(stderr, "target is not responding\n");
exit(1);
}
usleep(5*1000); /* UM 26.3.1 pg 408 says max 3 ms */
got = dialog("12000", reply, sizeof(reply), 100);
trace_in(reply, got);
if (got != 4 || memcmp(reply, "OK\r\n", 4)) {
fprintf(stderr, "cannot set clock rate\n");
exit(1);
}
}
got = swuart_trx("?", 1, reply, sizeof(reply), 1000, 100);
dump(reply, got);
got = swuart_trx("Synchronized\r\n", 14,
reply, sizeof(reply), 1000, 100);
dump(reply, got);
/* ----- Command-line processing ------------------------------------------- */
got = swuart_trx("12000\r\n", 7,
reply, sizeof(reply), 1000, 100);
dump(reply, got);
got = swuart_trx("J\r\n", 7,
reply, sizeof(reply), 1000, 100);
dump(reply, got);
int main(int argc, char **argv)
{
uint8_t reply[1000];
int got;
start_isp();
got = dialog("J", reply, sizeof(reply), 100);
trace_in(reply, got);
return 0;
}