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scpi: Fix incomplete data issue for e.g. Hameg HMO1024. 

On a Hameg HMO1024 you get incomplete data because the USB transfer takes
longer than the scpi->read_timeout_ms of 1 second that is defined in
scpi_dev_inst_new(). Therefore reset the timeout in sr_scpi_get_string()
whenever the device sends a partial response.
This commit is contained in:
Mathias Katzer 2015-01-11 01:40:28 +01:00 committed by Uwe Hermann
parent f62f595bfc
commit 3b95bd9152
1 changed files with 8 additions and 6 deletions
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14
src/scpi/scpi.c
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@ -383,7 +383,7 @@ SR_PRIV int sr_scpi_get_string(struct sr_scpi_dev_inst *scpi,
char buf[256];
int len;
GString *response;
gint64 start;
gint64 laststart;
unsigned int elapsed_ms;
if (command)
@ -393,7 +393,7 @@ SR_PRIV int sr_scpi_get_string(struct sr_scpi_dev_inst *scpi,
if (sr_scpi_read_begin(scpi) != SR_OK)
return SR_ERR;
start = g_get_monotonic_time();
laststart = g_get_monotonic_time();
response = g_string_new("");
@ -402,13 +402,15 @@ SR_PRIV int sr_scpi_get_string(struct sr_scpi_dev_inst *scpi,
while (!sr_scpi_read_complete(scpi)) {
len = sr_scpi_read_data(scpi, buf, sizeof(buf));
if (len < 0) {
sr_err("Incompletely read SCPI response.");
g_string_free(response, TRUE);
return SR_ERR;
} else if (len > 0) {
laststart = g_get_monotonic_time();
}
g_string_append_len(response, buf, len);
elapsed_ms = (g_get_monotonic_time() - start) / 1000;
if (elapsed_ms >= scpi->read_timeout_ms)
{
elapsed_ms = (g_get_monotonic_time() - laststart) / 1000;
if (elapsed_ms >= scpi->read_timeout_ms) {
sr_err("Timed out waiting for SCPI response.");
g_string_free(response, TRUE);
return SR_ERR;
@ -426,7 +428,7 @@ SR_PRIV int sr_scpi_get_string(struct sr_scpi_dev_inst *scpi,
*scpi_response = response->str;
g_string_free(response, FALSE);
sr_spew("Got response: '%.70s'.", *scpi_response);
sr_spew("Got response: '%.70s', length %d.", *scpi_response, strlen(*scpi_response));
return SR_OK;
}