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/* Copyright 2022 @ lokher (https://www.keychron.com)
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "quantum.h"
#include "bluetooth.h"
#include "battery.h"
#include "transport.h"
#include "ckbt51.h"
#include "lpm.h"
#include "indicator.h"
#include "rtc_timer.h"
#define BATTERY_EMPTY_COUNT 10
#define CRITICAL_LOW_COUNT 20
static uint32_t bat_monitor_timer_buffer = 0;
static uint16_t voltage = FULL_VOLTAGE_VALUE;
static uint8_t bat_empty = 0;
static uint8_t critical_low = 0;
static uint8_t bat_state;
static uint8_t power_on_sample = 0;
void battery_init(void) {
bat_state = BAT_NOT_CHARGING;
}
__attribute__((weak)) void battery_measure(void) {
ckbt51_read_state_reg(0x05, 0x02);
}
/* Calculate the voltage */
__attribute__((weak)) void battery_calculate_voltage(uint16_t value) {}
void battery_set_voltage(uint16_t value) {
voltage = value;
}
uint16_t battery_get_voltage(void) {
return voltage;
}
uint8_t battery_get_percentage(void) {
if (voltage > FULL_VOLTAGE_VALUE) return 100;
if (voltage > EMPTY_VOLTAGE_VALUE) {
return ((uint32_t)voltage - EMPTY_VOLTAGE_VALUE) * 80 / (FULL_VOLTAGE_VALUE - EMPTY_VOLTAGE_VALUE) + 20;
}
if (voltage > SHUTDOWN_VOLTAGE_VALUE) {
return ((uint32_t)voltage - SHUTDOWN_VOLTAGE_VALUE) * 20 / (EMPTY_VOLTAGE_VALUE - SHUTDOWN_VOLTAGE_VALUE);
} else
return 0;
}
bool battery_is_empty(void) {
return bat_empty > BATTERY_EMPTY_COUNT;
}
bool battery_is_critical_low(void) {
return critical_low > CRITICAL_LOW_COUNT;
}
void battery_check_empty(void) {
if (voltage < EMPTY_VOLTAGE_VALUE) {
if (bat_empty <= BATTERY_EMPTY_COUNT) {
if (++bat_empty > BATTERY_EMPTY_COUNT) {
#if defined(BAT_LOW_LED_PIN) || defined(BAT_LOW_LED_PIN_STATE)
indicator_battery_low_enable(true);
#endif
#if defined(LOW_BAT_IND_INDEX)
indicator_battery_low_backlit_enable(true);
#endif
power_on_sample = VOLTAGE_POWER_ON_MEASURE_COUNT;
}
}
}
}
void battery_check_critical_low(void) {
if (voltage < SHUTDOWN_VOLTAGE_VALUE) {
if (critical_low <= CRITICAL_LOW_COUNT) {
if (++critical_low > CRITICAL_LOW_COUNT) bluetooth_low_battery_shutdown();
}
} else if (critical_low <= CRITICAL_LOW_COUNT) {
critical_low = 0;
}
}
bool battery_power_on_sample(void) {
return power_on_sample < VOLTAGE_POWER_ON_MEASURE_COUNT;
}
void battery_task(void) {
uint32_t t = rtc_timer_elapsed_ms(bat_monitor_timer_buffer);
if (get_transport() == TRANSPORT_BLUETOOTH && bluetooth_get_state() == BLUETOOTH_CONNECTED) {
if ((battery_power_on_sample()
#if defined(LED_MATRIX_ENABLE) || defined(RGB_MATRIX_ENABLE)
&& !indicator_is_enabled()
#endif
&& t > BACKLIGHT_OFF_VOLTAGE_MEASURE_INTERVAL) ||
t > VOLTAGE_MEASURE_INTERVAL) {
battery_check_empty();
battery_check_critical_low();
bat_monitor_timer_buffer = rtc_timer_read_ms();
if (bat_monitor_timer_buffer > RTC_MAX_TIME) {
bat_monitor_timer_buffer = 0;
rtc_timer_clear();
}
battery_measure();
power_on_sample++;
if (power_on_sample > VOLTAGE_POWER_ON_MEASURE_COUNT) power_on_sample = VOLTAGE_POWER_ON_MEASURE_COUNT;
}
}
if ((bat_empty || critical_low) && usb_power_connected()) {
bat_empty = false;
critical_low = false;
#if defined(BAT_LOW_LED_PIN) || defined(BAT_LOW_LED_PIN_STATE)
indicator_battery_low_enable(false);
#endif
#if defined(LOW_BAT_IND_INDEX)
indicator_battery_low_backlit_enable(false);
#endif
}
}
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