diff options
Diffstat (limited to 'chip/stm32/power_led.c')
| -rw-r--r-- | chip/stm32/power_led.c | 43 |
1 files changed, 32 insertions, 11 deletions
diff --git a/chip/stm32/power_led.c b/chip/stm32/power_led.c index bad0c23d17..6fbfb720ec 100644 --- a/chip/stm32/power_led.c +++ b/chip/stm32/power_led.c @@ -38,14 +38,33 @@ void powerled_set_state(enum powerled_state new_state) task_wake(TASK_ID_POWERLED); } -static void power_led_use_pwm(void) +static void power_led_set_duty(int percent) { - uint32_t val; + ASSERT((percent >= 0) && (percent <= 100)); + power_led_percent = percent; + /* + * Set the duty cycle. CCRx = percent * ARR / 100. Since we set + * ARR=100, this is just percent. + */ +#ifdef BOARD_pit + STM32_TIM_CCR3(2) = percent; +#else + STM32_TIM_CCR2(2) = percent; +#endif +} +static void power_led_use_pwm(void) +{ /* Configure power LED GPIO for TIM2/PWM alternate function */ - val = STM32_GPIO_CRL(GPIO_B) & ~0x0000f000; +#ifdef BOARD_pit + /* PA2 = TIM2_CH3 */ + gpio_set_alternate_function(GPIO_A, (1 << 2), GPIO_ALT_TIM2); +#else + /* PB3 = TIM2_CH2 */ + uint32_t val = STM32_GPIO_CRL(GPIO_B) & ~0x0000f000; val |= 0x00009000; /* alt. function (TIM2/PWM) */ STM32_GPIO_CRL(GPIO_B) = val; +#endif /* Enable TIM2 clock */ STM32_RCC_APB1ENR |= 0x1; @@ -63,13 +82,22 @@ static void power_led_use_pwm(void) */ STM32_TIM_PSC(2) = CPU_CLOCK / 10000; /* pre-scaler */ STM32_TIM_ARR(2) = 100; /* auto-reload value */ - STM32_TIM_CCR2(2) = 100; /* duty cycle */ + power_led_set_duty(100); + +#ifdef BOARD_PIT + /* CC3 configured as output, PWM mode 1, preload enable */ + STM32_TIM_CCMR2(2) = (6 << 4) | (1 << 3); + + /* CC3 output enable, active low */ + STM32_TIM_CCER(2) = (1 << 8) | (1 << 9); +#else /* CC2 configured as output, PWM mode 1, preload enable */ STM32_TIM_CCMR1(2) = (6 << 12) | (1 << 11); /* CC2 output enable, active low */ STM32_TIM_CCER(2) = (1 << 4) | (1 << 5); +#endif /* Generate update event to force loading of shadow registers */ STM32_TIM_EGR(2) |= 1; @@ -99,13 +127,6 @@ static void power_led_manual_off(void) using_pwm = 0; } -static void power_led_set_duty(int percent) -{ - ASSERT((percent >= 0) && (percent <= 100)); - power_led_percent = percent; - STM32_TIM_CCR2(2) = (STM32_TIM_ARR(2) / 100) * percent; -} - /** * Return the timeout period (in us) for the current step. */ |