/* arbitrary limit on host name length: */
#define REMOTE_BITBANG_HOST_MAX 255
-#define REMOTE_BITBANG_RAISE_ERROR(expr ...) \
- do { \
- LOG_ERROR(expr); \
- LOG_ERROR("Terminating openocd."); \
- exit(-1); \
- } while (0)
-
static char *remote_bitbang_host;
static char *remote_bitbang_port;
-FILE *remote_bitbang_in;
-FILE *remote_bitbang_out;
+static FILE *remote_bitbang_file;
+static int remote_bitbang_fd;
+
+/* Circular buffer. When start == end, the buffer is empty. */
+static char remote_bitbang_buf[64];
+static unsigned remote_bitbang_start;
+static unsigned remote_bitbang_end;
+
+static int remote_bitbang_buf_full(void)
+{
+ return remote_bitbang_end ==
+ ((remote_bitbang_start + sizeof(remote_bitbang_buf) - 1) %
+ sizeof(remote_bitbang_buf));
+}
-static void remote_bitbang_putc(int c)
+/* Read any incoming data, placing it into the buffer. */
+static int remote_bitbang_fill_buf(void)
{
- if (EOF == fputc(c, remote_bitbang_out))
- REMOTE_BITBANG_RAISE_ERROR("remote_bitbang_putc: %s", strerror(errno));
+ socket_nonblock(remote_bitbang_fd);
+ while (!remote_bitbang_buf_full()) {
+ unsigned contiguous_available_space;
+ if (remote_bitbang_end >= remote_bitbang_start) {
+ contiguous_available_space = sizeof(remote_bitbang_buf) -
+ remote_bitbang_end;
+ if (remote_bitbang_start == 0)
+ contiguous_available_space -= 1;
+ } else {
+ contiguous_available_space = remote_bitbang_start -
+ remote_bitbang_end - 1;
+ }
+ ssize_t count = read(remote_bitbang_fd,
+ remote_bitbang_buf + remote_bitbang_end,
+ contiguous_available_space);
+ if (count > 0) {
+ remote_bitbang_end += count;
+ if (remote_bitbang_end == sizeof(remote_bitbang_buf))
+ remote_bitbang_end = 0;
+ } else if (count == 0) {
+ return ERROR_OK;
+ } else if (count < 0) {
+ if (errno == EAGAIN) {
+ return ERROR_OK;
+ } else {
+ LOG_ERROR("remote_bitbang_fill_buf: %s (%d)",
+ strerror(errno), errno);
+ return ERROR_FAIL;
+ }
+ }
+ }
+
+ return ERROR_OK;
+}
+
+static int remote_bitbang_putc(int c)
+{
+ if (EOF == fputc(c, remote_bitbang_file)) {
+ LOG_ERROR("remote_bitbang_putc: %s", strerror(errno));
+ return ERROR_FAIL;
+ }
+ return ERROR_OK;
}
static int remote_bitbang_quit(void)
{
- if (EOF == fputc('Q', remote_bitbang_out)) {
+ if (EOF == fputc('Q', remote_bitbang_file)) {
LOG_ERROR("fputs: %s", strerror(errno));
return ERROR_FAIL;
}
- if (EOF == fflush(remote_bitbang_out)) {
+ if (EOF == fflush(remote_bitbang_file)) {
LOG_ERROR("fflush: %s", strerror(errno));
return ERROR_FAIL;
}
/* We only need to close one of the FILE*s, because they both use the same */
/* underlying file descriptor. */
- if (EOF == fclose(remote_bitbang_out)) {
+ if (EOF == fclose(remote_bitbang_file)) {
LOG_ERROR("fclose: %s", strerror(errno));
return ERROR_FAIL;
}
return ERROR_OK;
}
-/* Get the next read response. */
-static int remote_bitbang_rread(void)
+static bb_value_t char_to_int(int c)
{
- if (EOF == fflush(remote_bitbang_out)) {
- remote_bitbang_quit();
- REMOTE_BITBANG_RAISE_ERROR("fflush: %s", strerror(errno));
- }
-
- int c = fgetc(remote_bitbang_in);
switch (c) {
case '0':
- return 0;
+ return BB_LOW;
case '1':
- return 1;
+ return BB_HIGH;
default:
remote_bitbang_quit();
- REMOTE_BITBANG_RAISE_ERROR(
- "remote_bitbang: invalid read response: %c(%i)", c, c);
+ LOG_ERROR("remote_bitbang: invalid read response: %c(%i)", c, c);
+ return BB_ERROR;
+ }
+}
+
+/* Get the next read response. */
+static bb_value_t remote_bitbang_rread(void)
+{
+ if (EOF == fflush(remote_bitbang_file)) {
+ remote_bitbang_quit();
+ LOG_ERROR("fflush: %s", strerror(errno));
+ return BB_ERROR;
+ }
+
+ /* Enable blocking access. */
+ socket_block(remote_bitbang_fd);
+ char c;
+ ssize_t count = read(remote_bitbang_fd, &c, 1);
+ if (count == 1) {
+ return char_to_int(c);
+ } else {
+ remote_bitbang_quit();
+ LOG_ERROR("read: count=%d, error=%s", (int) count, strerror(errno));
+ return BB_ERROR;
}
}
-static int remote_bitbang_read(void)
+static int remote_bitbang_sample(void)
{
- remote_bitbang_putc('R');
+ if (remote_bitbang_fill_buf() != ERROR_OK)
+ return ERROR_FAIL;
+ assert(!remote_bitbang_buf_full());
+ return remote_bitbang_putc('R');
+}
+
+static bb_value_t remote_bitbang_read_sample(void)
+{
+ if (remote_bitbang_start != remote_bitbang_end) {
+ int c = remote_bitbang_buf[remote_bitbang_start];
+ remote_bitbang_start =
+ (remote_bitbang_start + 1) % sizeof(remote_bitbang_buf);
+ return char_to_int(c);
+ }
return remote_bitbang_rread();
}
-static void remote_bitbang_write(int tck, int tms, int tdi)
+static int remote_bitbang_write(int tck, int tms, int tdi)
{
char c = '0' + ((tck ? 0x4 : 0x0) | (tms ? 0x2 : 0x0) | (tdi ? 0x1 : 0x0));
- remote_bitbang_putc(c);
+ return remote_bitbang_putc(c);
}
-static void remote_bitbang_reset(int trst, int srst)
+static int remote_bitbang_reset(int trst, int srst)
{
char c = 'r' + ((trst ? 0x2 : 0x0) | (srst ? 0x1 : 0x0));
- remote_bitbang_putc(c);
+ return remote_bitbang_putc(c);
}
-static void remote_bitbang_blink(int on)
+static int remote_bitbang_blink(int on)
{
char c = on ? 'B' : 'b';
- remote_bitbang_putc(c);
+ return remote_bitbang_putc(c);
}
static struct bitbang_interface remote_bitbang_bitbang = {
- .read = &remote_bitbang_read,
+ .buf_size = sizeof(remote_bitbang_buf) - 1,
+ .sample = &remote_bitbang_sample,
+ .read_sample = &remote_bitbang_read_sample,
.write = &remote_bitbang_write,
.reset = &remote_bitbang_reset,
.blink = &remote_bitbang_blink,
{
struct addrinfo hints = { .ai_family = AF_UNSPEC, .ai_socktype = SOCK_STREAM };
struct addrinfo *result, *rp;
- int fd;
+ int fd = 0;
LOG_INFO("Connecting to %s:%s",
remote_bitbang_host ? remote_bitbang_host : "localhost",
static int remote_bitbang_init(void)
{
- int fd;
bitbang_interface = &remote_bitbang_bitbang;
+ remote_bitbang_start = 0;
+ remote_bitbang_end = 0;
+
LOG_INFO("Initializing remote_bitbang driver");
if (remote_bitbang_port == NULL)
- fd = remote_bitbang_init_unix();
+ remote_bitbang_fd = remote_bitbang_init_unix();
else
- fd = remote_bitbang_init_tcp();
+ remote_bitbang_fd = remote_bitbang_init_tcp();
- if (fd < 0)
- return fd;
-
- remote_bitbang_in = fdopen(fd, "r");
- if (remote_bitbang_in == NULL) {
- LOG_ERROR("fdopen: failed to open read stream");
- close(fd);
- return ERROR_FAIL;
- }
+ if (remote_bitbang_fd < 0)
+ return remote_bitbang_fd;
- remote_bitbang_out = fdopen(fd, "w");
- if (remote_bitbang_out == NULL) {
+ remote_bitbang_file = fdopen(remote_bitbang_fd, "w+");
+ if (remote_bitbang_file == NULL) {
LOG_ERROR("fdopen: failed to open write stream");
- fclose(remote_bitbang_in);
+ close(remote_bitbang_fd);
return ERROR_FAIL;
}
projects / fw / openocd / blobdiff