51 lines
2 KiB
Markdown
51 lines
2 KiB
Markdown
# Battery Driver
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This driver provides support for sampling battery level.
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## Usage
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To use this driver, add the following to your `rules.mk`:
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```make
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BATTERY_DRIVER_REQUIRED = yes
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```
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## Basic Configuration {#basic-configuration}
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Add the following to your `config.h`:
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|Define |Default |Description |
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|--------------------------|--------|--------------------------------------------------|
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|`BATTERY_SAMPLE_INTERVAL` |`30000` |The time between battery samples in milliseconds. |
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## Driver Configuration {#driver-configuration}
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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.
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### ADC Driver {#adc-driver}
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This is the default battery driver. The default configuration assumes the battery is connected to a ADC capable pin through a voltage divider.
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```make
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BATTERY_DRIVER = adc
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```
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The following `#define`s apply only to the `adc` driver:
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|Define |Default |Description |
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|-----------------------------|--------------|--------------------------------------------------------------|
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|`BATTERY_PIN` |*Not defined* |The GPIO pin connected to the voltage divider. |
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|`BATTERY_REF_VOLTAGE_MV` |`3300` |The ADC reverence voltage, in millivolts. |
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|`BATTERY_VOLTAGE_DIVIDER_R1` |`100000` |The voltage divider resistance, in kOhm. Set to 0 to disable. |
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|`BATTERY_VOLTAGE_DIVIDER_R1` |`100000` |The voltage divider resistance, in kOhm. Set to 0 to disable. |
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|`BATTERY_ADC_RESOLUTION` |`10` |The ADC resolution configured for the ADC Driver. |
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## Functions
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### `uint8_t battery_get_percent(void)` {#api-battery-get-percent}
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Sample battery level.
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#### Return Value {#api-battery-get-percent-return}
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The battery percentage, in the range 0-100.
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