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qmk_firmware

custom branch of QMK firmware git clone https://anongit.hacktivis.me/git/qmk_firmware.git

battery_adc.c (1368B)

    

  1. // Copyright 2025 QMK
  2. // SPDX-License-Identifier: GPL-2.0-or-later
  4. #include "analog.h"
  5. #include "gpio.h"
  7. #ifndef BATTERY_PIN
  8. #    error("BATTERY_PIN not configured!")
  9. #endif
  11. #ifndef BATTERY_REF_VOLTAGE_MV
  12. #    define BATTERY_REF_VOLTAGE_MV 3300
  13. #endif
  15. #ifndef BATTERY_VOLTAGE_DIVIDER_R1
  16. #    define BATTERY_VOLTAGE_DIVIDER_R1 100
  17. #endif
  19. #ifndef BATTERY_VOLTAGE_DIVIDER_R2
  20. #    define BATTERY_VOLTAGE_DIVIDER_R2 100
  21. #endif
  23. // TODO: infer from adc config?
  24. #ifndef BATTERY_ADC_RESOLUTION
  25. #    define BATTERY_ADC_RESOLUTION 10
  26. #endif
  28. void battery_driver_init(void) {
  29.     gpio_set_pin_input(BATTERY_PIN);
  30. }
  32. uint16_t battery_driver_get_mv(void) {
  33.     uint32_t raw = analogReadPin(BATTERY_PIN);
  35.     uint32_t bat_mv = raw * BATTERY_REF_VOLTAGE_MV / (1 << BATTERY_ADC_RESOLUTION);
  37. #if BATTERY_VOLTAGE_DIVIDER_R1 > 0 && BATTERY_VOLTAGE_DIVIDER_R2 > 0
  38.     bat_mv = bat_mv * (BATTERY_VOLTAGE_DIVIDER_R1 + BATTERY_VOLTAGE_DIVIDER_R2) / BATTERY_VOLTAGE_DIVIDER_R2;
  39. #endif
  41.     return bat_mv;
  42. }
  44. uint8_t battery_driver_sample_percent(void) {
  45.     uint16_t bat_mv = battery_driver_get_mv();
  47.     // https://github.com/zmkfirmware/zmk/blob/3f7c9d7cc4f46617faad288421025ea2a6b0bd28/app/module/drivers/sensor/battery/battery_common.c#L33
  48.     if (bat_mv >= 4200) {
  49.         return 100;
  50.     } else if (bat_mv <= 3450) {
  51.         return 0;
  52.     }
  54.     return bat_mv * 2 / 15 - 459;
  55. }