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fixup! feat(core/embed): prepare backlight driver for low power mode

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This commit is contained in:
cepetr 2024-06-25 08:45:43 +02:00
parent ab4467df23
commit b90ae27ed9
1 changed files with 22 additions and 12 deletions
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34
core/embed/trezorhal/stm32f4/backlight_pwm.c
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@ -198,28 +198,38 @@ void backlight_pwm_deinit(backlight_action_t action) {
return;
}
if (action == BACKLIGHT_RETAIN) {
// We keep both the GPIO and the timer running
#ifdef TREZOR_MODEL_T
// This code here is for backward compatibility with the old
// bootloader that used a different PWM settings.
// This code is for backward compatibility with the older
// bootloader/firmware on model T that used different
// PWM settings and relies on proper settings from the
// previous stage during boot.
// about 10Hz (with PSC = (SystemCoreClock / 1000000) - 1)
#define LED_PWM_SLOW_TIM_PERIOD (10000)
#define LED_PWM_PRESCALER_SLOW (SystemCoreClock / 1000000 - 1) // 1 MHz
BACKLIGHT_PWM_TIM->PSC = LED_PWM_PRESCALER_SLOW;
BACKLIGHT_PWM_TIM->CR1 |= TIM_CR1_ARPE;
BACKLIGHT_PWM_TIM->CR2 |= TIM_CR2_CCPC;
BACKLIGHT_PWM_TIM->ARR = LED_PWM_SLOW_TIM_PERIOD - 1;
BACKLIGHT_PWM_TIM->PSC = LED_PWM_PRESCALER_SLOW;
BACKLIGHT_PWM_TIM->CR1 |= TIM_CR1_ARPE;
BACKLIGHT_PWM_TIM->CR2 |= TIM_CR2_CCPC;
BACKLIGHT_PWM_TIM->ARR = LED_PWM_SLOW_TIM_PERIOD - 1;
if (action == BACKLIGHT_RESET) {
BACKLIGHT_PWM_TIM->BACKLIGHT_PWM_TIM_CCR = 0;
} else { // action == BACKLIGHT_RETAIN
BACKLIGHT_PWM_TIM->BACKLIGHT_PWM_TIM_CCR =
(LED_PWM_SLOW_TIM_PERIOD * drv->current_level) / 255;
#endif
} else {
// TODO: deinitialize GPIOs and the TIMER
}
#else
if (action == BACKLIGHT_RESET) {
// TODO: reset TIMER and GPIO
BACKLIGHT_PWM_TIM->BACKLIGHT_PWM_TIM_CCR = 0;
} else { // action == BACKLIGHT_RETAIN
BACKLIGHT_PWM_TIM->BACKLIGHT_PWM_TIM_CCR =
(LED_PWM_TIM_PERIOD * drv->current_level) / 255;
}
#endif
drv->initialized = false;
}