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serial-dmm: Handle time-limited acquisition 

Implement SR_HWCAP_LIMIT_MSEC capability, to allow acquisition to automatically
stop after a specified amount of time.

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>
This commit is contained in:
Alexandru Gagniuc 2012-12-23 12:48:48 -06:00 committed by Uwe Hermann
parent 47eda193b2
commit f9b9bd632f
3 changed files with 22 additions and 0 deletions
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7
hardware/serial-dmm/api.c
View File

@ -38,6 +38,7 @@ static const int hwopts[] = {
static const int hwcaps[] = {
SR_HWCAP_MULTIMETER,
SR_HWCAP_LIMIT_SAMPLES,
SR_HWCAP_LIMIT_MSEC,
SR_HWCAP_CONTINUOUS,
0,
};
@ -411,6 +412,11 @@ static int hw_dev_config_set(const struct sr_dev_inst *sdi, int hwcap,
sr_dbg("Setting sample limit to %" PRIu64 ".",
devc->limit_samples);
break;
case SR_HWCAP_LIMIT_MSEC:
devc->limit_msec = *(const uint64_t *)value;
sr_dbg("Setting time limit to %" PRIu64 "ms.",
devc->limit_msec);
break;
default:
sr_err("Unknown capability: %d.", hwcap);
return SR_ERR;
@ -443,6 +449,7 @@ static int hw_dev_acquisition_start(const struct sr_dev_inst *sdi,
* quit without acquiring any new samples.
*/
devc->num_samples = 0;
devc->starttime = g_get_monotonic_time();
/* Send header packet to the session bus. */
sr_dbg("Sending SR_DF_HEADER.");

10
hardware/serial-dmm/protocol.c
View File

@ -153,6 +153,7 @@ static int receive_data(int fd, int revents, int dmm, void *info, void *cb_data)
{
struct sr_dev_inst *sdi;
struct dev_context *devc;
int64_t time;
int ret;
(void)fd;
@ -183,6 +184,15 @@ static int receive_data(int fd, int revents, int dmm, void *info, void *cb_data)
return TRUE;
}
if (devc->limit_msec) {
time = (g_get_monotonic_time() - devc->starttime) / 1000;
if (time > (int64_t)devc->limit_msec) {
sr_info("Requested time limit reached, stopping.");
sdi->driver->dev_acquisition_stop(sdi, cb_data);
return TRUE;
}
}
return TRUE;
}

5
hardware/serial-dmm/protocol.h
View File

@ -72,12 +72,17 @@ struct dev_context {
/** The current sampling limit (in number of samples). */
uint64_t limit_samples;
/** The time limit (in milliseconds). */
uint64_t limit_msec;
/** Opaque pointer passed in by the frontend. */
void *cb_data;
/** The current number of already received samples. */
uint64_t num_samples;
int64_t starttime;
struct sr_serial_dev_inst *serial;
uint8_t buf[DMM_BUFSIZE];