/**
* Open the specified serial port.
*
* @param serial Previously initialized serial port structure.
* @param flags Flags to use when opening the serial port. Possible flags
* include SERIAL_RDWR, SERIAL_RDONLY, SERIAL_NONBLOCK.
*
* If the serial structure contains a serialcomm string, it will be
* passed to serial_set_paramstr() after the port is opened.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags)
{
int ret;
char *error;
int sp_flags = 0;
if (!serial) {
sr_dbg("Invalid serial port.");
return SR_ERR;
}
sr_spew("Opening serial port '%s' (flags %d).", serial->port, flags);
sp_get_port_by_name(serial->port, &serial->data);
if (flags & SERIAL_RDWR)
sp_flags = (SP_MODE_READ | SP_MODE_WRITE);
else if (flags & SERIAL_RDONLY)
sp_flags = SP_MODE_READ;
serial->nonblocking = (flags & SERIAL_NONBLOCK) ? 1 : 0;
ret = sp_open(serial->data, sp_flags);
switch (ret) {
case SP_ERR_ARG:
sr_err("Attempt to open serial port with invalid parameters.");
return SR_ERR_ARG;
case SP_ERR_FAIL:
error = sp_last_error_message();
sr_err("Error opening port: %s.", error);
sp_free_error_message(error);
return SR_ERR;
}
#ifndef _WIN32
sp_get_port_handle(serial->data, &serial->fd);
#endif
if (serial->serialcomm)
return serial_set_paramstr(serial, serial->serialcomm);
else
return SR_OK;
}
/**
* Open the specified serial port.
*
* @param serial Previously initialized serial port structure.
* @param flags Flags to use when opening the serial port. Possible flags
* include SERIAL_RDWR, SERIAL_RDONLY, SERIAL_NONBLOCK.
*
* If the serial structure contains a serialcomm string, it will be
* passed to serial_set_paramstr() after the port is opened.
*
* @return SR_OK on success, SR_ERR on failure.
*/
SR_PRIV int serial_open(struct sr_serial_dev_inst *serial, int flags)
{
int ret;
char *error;
if (!serial) {
sr_dbg("Invalid serial port.");
return SR_ERR;
}
sr_spew("Opening serial port '%s' (flags %d).", serial->port, flags);
sp_get_port_by_name(serial->port, &serial->data);
ret = sp_open(serial->data, flags);
switch (ret) {
case SP_ERR_ARG:
sr_err("Attempt to open serial port with invalid parameters.");
return SR_ERR_ARG;
case SP_ERR_FAIL:
error = sp_last_error_message();
sr_err("Error opening port: %s.", error);
sp_free_error_message(error);
return SR_ERR;
}
#ifndef _WIN32
serial->fd = serial->data->fd;
#endif
if (serial->serialcomm)
return serial_set_paramstr(serial, serial->serialcomm);
else
return SR_OK;
}
/**
* Scan for Metrahit 1x and Metrahit 2x in send mode using Gossen Metrawatt
* 'RS232' interface.
*
* The older 1x models use 8192 baud and the newer 2x 9600 baud.
* The DMM usually sends up to about 20 messages per second. However, depending
* on configuration and measurement mode the intervals can be much larger and
* then the detection might not work.
*/
static GSList *scan_1x_2x_rs232(struct sr_dev_driver *di, GSList *options)
{
struct sr_dev_inst *sdi;
struct drv_context *drvc;
struct dev_context *devc;
struct sr_config *src;
struct sr_serial_dev_inst *serial;
GSList *l, *devices;
const char *conn, *serialcomm;
enum model model;
gboolean serialcomm_given;
devices = NULL;
drvc = di->context;
drvc->instances = NULL;
conn = serialcomm = NULL;
serialcomm_given = FALSE;
sr_spew("scan_1x_2x_rs232() called!");
for (l = options; l; l = l->next) {
src = l->data;
switch (src->key) {
case SR_CONF_CONN:
conn = g_variant_get_string(src->data, NULL);
break;
case SR_CONF_SERIALCOMM:
serialcomm = g_variant_get_string(src->data, NULL);
serialcomm_given = TRUE;
break;
}
}
if (!conn)
return NULL;
if (!serialcomm)
serialcomm = SERIALCOMM_2X_RS232;
serial = sr_serial_dev_inst_new(conn, serialcomm);
if (serial_open(serial, SERIAL_RDWR) != SR_OK) {
sr_serial_dev_inst_free(serial);
return NULL;
}
serial_flush(serial);
model = scan_model_sm(serial);
/*
* If detection failed and no user-supplied parameters,
* try second baud rate.
*/
if ((model == METRAHIT_NONE) && !serialcomm_given) {
serialcomm = SERIALCOMM_1X_RS232;
g_free(serial->serialcomm);
serial->serialcomm = g_strdup(serialcomm);
if (serial_set_paramstr(serial, serialcomm) == SR_OK) {
serial_flush(serial);
model = scan_model_sm(serial);
}
}
if (model != METRAHIT_NONE) {
sr_spew("%s %s detected!", VENDOR_GMC, gmc_model_str(model));
sdi = g_malloc0(sizeof(struct sr_dev_inst));
sdi->status = SR_ST_INACTIVE;
sdi->vendor = g_strdup(VENDOR_GMC);
sdi->model = g_strdup(gmc_model_str(model));
devc = g_malloc0(sizeof(struct dev_context));
devc->model = model;
devc->limit_samples = 0;
devc->limit_msec = 0;
devc->num_samples = 0;
devc->elapsed_msec = g_timer_new();
devc->settings_ok = FALSE;
sdi->conn = serial;
sdi->priv = devc;
sdi->driver = di;
sr_channel_new(sdi, 0, SR_CHANNEL_ANALOG, TRUE, "P1");
drvc->instances = g_slist_append(drvc->instances, sdi);
devices = g_slist_append(devices, sdi);
}
return devices;
}
