static int
scd_isa_attach (device_t dev)
{
struct scd_softc * sc;
int error;
sc = device_get_softc(dev);
error = 0;
sc->dev = dev;
sc->port_rid = 0;
sc->port_type = SYS_RES_IOPORT;
error = scd_alloc_resources(dev);
if (error)
goto fail;
error = scd_probe(sc);
if (error) {
device_printf(dev, "Re-Probe failed.\n");
goto fail;
}
error = scd_attach(sc);
if (error) {
device_printf(dev, "Attach failed.\n");
goto fail;
}
return (0);
fail:
scd_release_resources(dev);
return (error);
}
static int
scd_isa_probe (device_t dev)
{
struct scd_softc * sc;
int error;
/* No pnp support */
if (isa_get_vendorid(dev))
return (ENXIO);
/* IO port must be configured. */
if (bus_get_resource_start(dev, SYS_RES_IOPORT, 0) == 0)
return (ENXIO);
sc = device_get_softc(dev);
sc->dev = dev;
sc->port_rid = 0;
sc->port_type = SYS_RES_IOPORT;
error = scd_alloc_resources(dev);
if (error)
goto fail;
error = scd_probe(sc);
if (error) {
device_printf(dev, "Probe failed.\n");
goto fail;
}
device_set_desc(dev, sc->data.name);
fail:
scd_release_resources(dev);
return (error);
}
int main(void) {
float32_t co2_ppm, temperature, relative_humidity;
uint16_t data_ready;
int16_t ret;
int16_t interval_in_seconds = 2;
/* Busy loop for initialization, because the main loop does not work without
* a sensor.
*/
while (scd_probe() != STATUS_OK) {
printf("SCD30 sensor probing failed\n");
sleep(1);
}
printf("SCD30 sensor probing successful\n");
scd_set_measurement_interval(interval_in_seconds);
usleep(20000);
scd_start_periodic_measurement(0);
sleep(interval_in_seconds);
while (1) {
/* Measure co2, temperature and relative humidity and store into
* variables.
*/
ret = scd_get_data_ready(&data_ready);
if (ret == STATUS_OK) {
if (data_ready) {
ret = scd_read_measurement(&co2_ppm, &temperature,
&relative_humidity);
if (ret != STATUS_OK) {
printf("error reading measurement\n");
} else {
printf("measured co2 concentration: %0.2f ppm, "
"measured temperature: %0.2f degreeCelsius, "
"measured humidity: %0.2f %%RH\n",
co2_ppm, temperature, relative_humidity);
}
} else {
printf("measurement not ready\n");
usleep(20000);
continue;
}
} else {
printf("error reading data ready flag\n");
}
sleep(interval_in_seconds);
}
scd_stop_periodic_measurement();
return 0;
}
