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diff --git a/docs/drivers/battery.md b/docs/drivers/battery.md new file mode 100644 index 0000000000..b1f75c1156 --- /dev/null +++ b/docs/drivers/battery.md @@ -0,0 +1,51 @@ +# Battery Driver + +This driver provides support for sampling battery level. + +## Usage + +To use this driver, add the following to your `rules.mk`: + +```make +BATTERY_DRIVER_REQUIRED = yes +``` + +## Basic Configuration {#basic-configuration} + +Add the following to your `config.h`: + +|Define |Default |Description | +|--------------------------|--------|--------------------------------------------------| +|`BATTERY_SAMPLE_INTERVAL` |`30000` |The time between battery samples in milliseconds. | + +## Driver Configuration {#driver-configuration} + +Driver selection can be configured in `rules.mk` as `BATTERY_DRIVER`. Valid values are `adc` (default), `vendor`, or `custom`. See below for information on individual drivers. + +### ADC Driver {#adc-driver} + +This is the default battery driver. The default configuration assumes the battery is connected to a ADC capable pin through a voltage divider. + +```make +BATTERY_DRIVER = adc +``` + +The following `#define`s apply only to the `adc` driver: + +|Define |Default |Description | +|-----------------------------|--------------|--------------------------------------------------------------| +|`BATTERY_PIN` |*Not defined* |The GPIO pin connected to the voltage divider. | +|`BATTERY_REF_VOLTAGE_MV` |`3300` |The ADC reverence voltage, in millivolts. | +|`BATTERY_VOLTAGE_DIVIDER_R1` |`100000` |The voltage divider resistance, in kOhm. Set to 0 to disable. | +|`BATTERY_VOLTAGE_DIVIDER_R1` |`100000` |The voltage divider resistance, in kOhm. Set to 0 to disable. | +|`BATTERY_ADC_RESOLUTION` |`10` |The ADC resolution configured for the ADC Driver. | + +## Functions + +### `uint8_t battery_get_percent(void)` {#api-battery-get-percent} + +Sample battery level. + +#### Return Value {#api-battery-get-percent-return} + +The battery percentage, in the range 0-100. |