#define LOG_PREFIX "scpi_serial"
-#define BUFFER_SIZE 1024
+#ifdef HAVE_SERIAL_COMM
struct scpi_serial {
struct sr_serial_dev_inst *serial;
- char buffer[BUFFER_SIZE];
- size_t count;
- size_t read;
+ gboolean got_newline;
};
+/* Default serial port options for some known USB devices */
static const struct {
uint16_t vendor_id;
uint16_t product_id;
} scpi_serial_usb_ids[] = {
{ 0x0403, 0xed72, "115200/8n1/flow=1" }, /* Hameg HO720 */
{ 0x0403, 0xed73, "115200/8n1/flow=1" }, /* Hameg HO730 */
+ { 0x0aad, 0x0117, "115200/8n1" }, /* R&S HMO series, previously branded as Hameg HMO */
+ { 0x0aad, 0x0118, "115200/8n1" }, /* R&S HMO series, previously branded as Hameg HMO */
+ { 0x0aad, 0x0119, "115200/8n1" }, /* R&S HMO series, previously branded as Hameg HMO */
+ { 0x2184, 0x0030, "115200/8n1" }, /* GW-Instek GDM-8341 (VCP, SiLabs CP210x) */
+ { 0x2184, 0x0058, "115200/8n1" }, /* GW-Instek GDM-9061 (USBCDC mode) */
};
static GSList *scpi_serial_scan(struct drv_context *drvc)
static int scpi_serial_dev_inst_new(void *priv, struct drv_context *drvc,
const char *resource, char **params, const char *serialcomm)
{
+ GSList *l, *r;
+ unsigned i;
struct scpi_serial *sscpi = priv;
(void)drvc;
(void)params;
+ /* If no serial port option is specified on the command-line using the
+ * "serialcomm" driver option, but the device is connected through USB
+ * and it requires a known default serial port option, then used it in
+ * order to avoid data corruption or even worse problems.
+ */
+ if (!serialcomm) {
+ for (i = 0; i < ARRAY_SIZE(scpi_serial_usb_ids); i++) {
+ if (!(l = sr_serial_find_usb(scpi_serial_usb_ids[i].vendor_id,
+ scpi_serial_usb_ids[i].product_id)))
+ continue;
+ for (r = l; r; r = r->next)
+ if (!strcmp(resource, r->data) && scpi_serial_usb_ids[i].serialcomm)
+ serialcomm = scpi_serial_usb_ids[i].serialcomm;
+ g_slist_free_full(l, g_free);
+ }
+ }
+
sscpi->serial = sr_serial_dev_inst_new(resource, serialcomm);
return SR_OK;
}
-static int scpi_serial_open(void *priv)
+static int scpi_serial_open(struct sr_scpi_dev_inst *scpi)
{
- struct scpi_serial *sscpi = priv;
+ struct scpi_serial *sscpi = scpi->priv;
struct sr_serial_dev_inst *serial = sscpi->serial;
if (serial_open(serial, SERIAL_RDWR) != SR_OK)
return SR_ERR;
- if (serial_flush(serial) != SR_OK)
- return SR_ERR;
+ sscpi->got_newline = FALSE;
+
+ return SR_OK;
+}
- sscpi->count = 0;
- sscpi->read = 0;
+static int scpi_serial_connection_id(struct sr_scpi_dev_inst *scpi,
+ char **connection_id)
+{
+ struct scpi_serial *sscpi = scpi->priv;
+ struct sr_serial_dev_inst *serial = sscpi->serial;
+
+ *connection_id = g_strdup(serial->port);
return SR_OK;
}
static int scpi_serial_send(void *priv, const char *command)
{
- int len, result, written;
- gchar *terminated_command;
+ int result;
struct scpi_serial *sscpi = priv;
struct sr_serial_dev_inst *serial = sscpi->serial;
- terminated_command = g_strconcat(command, "\n", NULL);
- len = strlen(terminated_command);
- written = 0;
- while (written < len) {
- result = serial_write_nonblocking(serial,
- terminated_command + written, len - written);
- if (result < 0) {
- sr_err("Error while sending SCPI command: '%s'.", command);
- g_free(terminated_command);
- return SR_ERR;
- }
- written += result;
+ result = serial_write_blocking(serial, command, strlen(command), 0);
+ if (result < 0) {
+ sr_err("Error while sending SCPI command '%s': %d.",
+ command, result);
+ return SR_ERR;
}
- g_free(terminated_command);
-
sr_spew("Successfully sent SCPI command: '%s'.", command);
return SR_OK;
static int scpi_serial_read_begin(void *priv)
{
- (void) priv;
+ struct scpi_serial *sscpi = priv;
+ sscpi->got_newline = FALSE;
return SR_OK;
}
static int scpi_serial_read_data(void *priv, char *buf, int maxlen)
{
struct scpi_serial *sscpi = priv;
- int len, ret;
-
- len = BUFFER_SIZE - sscpi->count;
-
- /* Try to read new data into the buffer if there is space. */
- if (len > 0) {
- ret = serial_read_nonblocking(sscpi->serial, sscpi->buffer + sscpi->count,
- BUFFER_SIZE - sscpi->count);
-
- if (ret < 0)
- return ret;
-
- sscpi->count += ret;
-
- if (ret > 0)
- sr_spew("Read %d bytes into buffer.", ret);
+ int ret;
+
+ /* Try to read new data into the buffer. */
+ ret = serial_read_nonblocking(sscpi->serial, buf, maxlen);
+ if (ret < 0)
+ return ret;
+
+ /*
+ * Check for line termination at the end of the receive data.
+ * Handle the usual case of NL, as well as the unusual NL+CR
+ * combination (some GWInstek DMMs were found to do this).
+ */
+ sscpi->got_newline = FALSE;
+ if (ret >= 1 && buf[ret - 1] == '\n') {
+ sscpi->got_newline = TRUE;
+ sr_spew("Received NL terminator");
+ } else if (ret >= 2 && buf[ret - 2] == '\n' && buf[ret - 1] == '\r') {
+ ret--;
+ sscpi->got_newline = TRUE;
+ sr_spew("Received NL+CR terminator");
}
- /* Return as many bytes as possible from buffer, excluding any trailing newline. */
- if (sscpi->read < sscpi->count) {
- len = sscpi->count - sscpi->read;
- if (len > maxlen)
- len = maxlen;
- if (sscpi->buffer[sscpi->read + len - 1] == '\n')
- len--;
- sr_spew("Returning %d bytes from buffer.", len);
- memcpy(buf, sscpi->buffer + sscpi->read, len);
- sscpi->read += len;
- if (sscpi->read == BUFFER_SIZE) {
- sr_spew("Resetting buffer.");
- sscpi->count = 0;
- sscpi->read = 0;
- }
- return len;
- }
-
- return 0;
+ return ret;
}
static int scpi_serial_read_complete(void *priv)
{
struct scpi_serial *sscpi = priv;
- /* If the next character is a newline, discard it and report complete. */
- if (sscpi->read < sscpi->count && sscpi->buffer[sscpi->read] == '\n') {
- sscpi->read++;
- return 1;
- } else {
- return 0;
- }
+ return sscpi->got_newline;
}
-static int scpi_serial_close(void *priv)
+static int scpi_serial_close(struct sr_scpi_dev_inst *scpi)
{
- struct scpi_serial *sscpi = priv;
+ struct scpi_serial *sscpi = scpi->priv;
return serial_close(sscpi->serial);
}
SR_PRIV const struct sr_scpi_dev_inst scpi_serial_dev = {
.name = "serial",
.prefix = "",
+ .transport = SCPI_TRANSPORT_SERIAL,
.priv_size = sizeof(struct scpi_serial),
.scan = scpi_serial_scan,
.dev_inst_new = scpi_serial_dev_inst_new,
.open = scpi_serial_open,
+ .connection_id = scpi_serial_connection_id,
.source_add = scpi_serial_source_add,
.source_remove = scpi_serial_source_remove,
.send = scpi_serial_send,
.close = scpi_serial_close,
.free = scpi_serial_free,
};
+
+#endif
projects / libsigrok.git / blobdiff