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drivers: sensor: ina237: add shunt voltage support

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Add ability to retrieve the shunt voltage if the end user wants to do
the power calculation manually to handle negative power values.

Signed-off-by: Eric Holmberg <eric.holmberg@northriversystems.co.nz>
This commit is contained in:
Eric Holmberg 2023-07-20 23:50:55 +12:00 • committed by Maureen Helm
commit 19e44ae9a0
6 changed files with 95 additions and 1 deletions
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14
drivers/sensor/ina23x/Kconfig
View file

@ -26,6 +26,20 @@ config INA237
help
Enable driver for INA237.
config INA237_VSHUNT
bool "INA237 VShunt Measurement Enable"
depends on DT_HAS_TI_INA237_ENABLED
help
Enable shunt voltage measurement for INA237.
This is the actual shunt voltage measured which is scaled within the
INA237 based upon the SHUNT_CAL register. This value is useful for
looking at measurement noise or debugging the SHUNT_CAL value.
Note that enabling this option requires an extra I2C read when
SENSOR_CHAN_ALL is selected, so only enable if the shunt voltage
measurement is required.
config INA230_TRIGGER
bool "INA230 trigger mode"
depends on INA230

28
drivers/sensor/ina23x/ina237.c
View file

@ -65,6 +65,18 @@ static int ina237_channel_get(const struct device *dev, enum sensor_channel chan
INA237_POWER_TO_uW((uint64_t)data->power * config->current_lsb));
break;
#ifdef CONFIG_INA237_VSHUNT
case SENSOR_CHAN_VSHUNT:
if (config->config & INA237_CFG_HIGH_PRECISION) {
/* high-resolution mode - 1.25 uV/bit, sensor value is in mV */
micro_s32_to_sensor_value(val, data->shunt_voltage * 1250);
} else {
/* standard-resolution - 5 uV/bit -> nano-volts */
micro_s32_to_sensor_value(val, data->shunt_voltage * 5000);
}
break;
#endif /* CONFIG_INA237_VSHUNT */
case SENSOR_CHAN_DIE_TEMP:
micro_s32_to_sensor_value(val, INA237_DIETEMP_TO_uDegC(data->die_temp));
break;
@ -165,6 +177,16 @@ static int ina237_read_data(const struct device *dev)
}
}
#ifdef CONFIG_INA237_VSHUNT
if ((data->chan == SENSOR_CHAN_ALL) || (data->chan == SENSOR_CHAN_VSHUNT)) {
ret = ina23x_reg_read_16(&config->bus, INA237_REG_SHUNT_VOLT, &data->shunt_voltage);
if (ret < 0) {
LOG_ERR("Failed to read shunt voltage");
return ret;
}
}
#endif /* CONFIG_INA237_VSHUNT */
return 0;
}
@ -179,7 +201,11 @@ static int ina237_sample_fetch(const struct device *dev, enum sensor_channel cha
struct ina237_data *data = dev->data;
if (chan != SENSOR_CHAN_ALL && chan != SENSOR_CHAN_VOLTAGE && chan != SENSOR_CHAN_CURRENT &&
chan != SENSOR_CHAN_POWER && chan != SENSOR_CHAN_DIE_TEMP) {
chan != SENSOR_CHAN_POWER &&
#ifdef CONFIG_INA237_VSHUNT
chan != SENSOR_CHAN_VSHUNT &&
#endif /* CONFIG_INA237_VSHUNT */
chan != SENSOR_CHAN_DIE_TEMP) {
return -ENOTSUP;
}

3
drivers/sensor/ina23x/ina237.h
View file

@ -43,6 +43,9 @@ struct ina237_data {
uint16_t bus_voltage;
uint32_t power;
int16_t die_temp;
#ifdef CONFIG_INA237_VSHUNT
int16_t shunt_voltage;
#endif
enum sensor_channel chan;
struct ina23x_trigger trigger;
};