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Do the ADC init only at startup and not during every sensor read call.

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This reduces the number of interrupts.
This commit is contained in:
Andreas Tobler 2012-08-19 19:31:36 +00:00
parent 8a1f9d1cf5
commit 11e31cd29a
1 changed files with 12 additions and 5 deletions
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17
sys/dev/iicbus/ad7417.c
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@ -104,6 +104,7 @@ struct ad7417_softc {
uint32_t sc_addr;
struct ad7417_sensor *sc_sensors;
int sc_nsensors;
int init_done;
};
static device_method_t ad7417_methods[] = {
/* Device interface */
@ -247,6 +248,9 @@ ad7417_init_adc(device_t dev, uint32_t addr)
{
uint8_t buf;
int err;
struct ad7417_softc *sc;
sc = device_get_softc(dev);
adc741x_config = 0;
/* Clear Config2 */
@ -267,6 +271,8 @@ ad7417_init_adc(device_t dev, uint32_t addr)
if (err < 0)
return (-1);
sc->init_done = 1;
return (0);
}
@ -430,10 +436,10 @@ ad7417_attach(device_t dev)
if (sc->sc_sensors[i].type == ADC7417_TEMP_SENSOR) {
unit = "temp";
desc = "Sensor temp in C";
desc = "sensor unit (C)";
} else {
unit = "volt";
desc = "Sensor Volt in V";
desc = "sensor unit (mV)";
}
/* I use i to pass the sensor id. */
SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(oid), OID_AUTO,
@ -584,9 +590,10 @@ ad7417_sensor_read(struct ad7417_sensor *sens)
sc = device_get_softc(sens->dev);
/* Init the ADC. */
if (ad7417_init_adc(sc->sc_dev, sc->sc_addr) < 0)
return (-1);
/* Init the ADC if not already done.*/
if (!sc->init_done)
if (ad7417_init_adc(sc->sc_dev, sc->sc_addr) < 0)
return (-1);
if (sens->type == ADC7417_TEMP_SENSOR) {
if (ad7417_get_temp(sc->sc_dev, sc->sc_addr, &temp) < 0)