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@ -29,7 +29,7 @@ void backlight_pwm_init(void) {
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GPIO_InitTypeDef GPIO_InitStructure;
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// LCD_PWM/PA7 (backlight control)
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// LCD_PWM (backlight control)
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GPIO_InitStructure.Mode = GPIO_MODE_AF_PP;
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GPIO_InitStructure.Pull = GPIO_NOPULL;
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GPIO_InitStructure.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
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@ -37,34 +37,113 @@ void backlight_pwm_init(void) {
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GPIO_InitStructure.Pin = BACKLIGHT_PWM_PIN;
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HAL_GPIO_Init(BACKLIGHT_PWM_PORT, &GPIO_InitStructure);
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// enable PWM timer
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TIM_HandleTypeDef TIM_Handle;
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TIM_Handle.Instance = BACKLIGHT_PWM_TIM;
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TIM_Handle.Init.Period = LED_PWM_TIM_PERIOD - 1;
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// TIM1/APB2 source frequency equals to SystemCoreClock in our configuration,
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// we want 1 MHz
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TIM_Handle.Init.Prescaler = LED_PWM_PRESCALER;
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TIM_Handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
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TIM_Handle.Init.CounterMode = TIM_COUNTERMODE_UP;
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TIM_Handle.Init.RepetitionCounter = 0;
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HAL_TIM_PWM_Init(&TIM_Handle);
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uint32_t tmpcr1 = 0;
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/* Select the Counter Mode */
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tmpcr1 |= TIM_COUNTERMODE_UP;
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/* Set the clock division */
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tmpcr1 |= (uint32_t)TIM_CLOCKDIVISION_DIV1;
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/* Set the auto-reload preload */
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#ifdef STM32U5
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tmpcr1 |= TIM_AUTORELOAD_PRELOAD_DISABLE;
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#endif
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BACKLIGHT_PWM_TIM->CR1 = tmpcr1;
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/* Set the Autoreload value */
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BACKLIGHT_PWM_TIM->ARR = (uint32_t)LED_PWM_TIM_PERIOD - 1;
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/* Set the Prescaler value */
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BACKLIGHT_PWM_TIM->PSC = LED_PWM_PRESCALER;
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/* Set the Repetition Counter value */
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BACKLIGHT_PWM_TIM->RCR = 0;
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/* Generate an update event to reload the Prescaler
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and the repetition counter (only for advanced timer) value immediately */
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BACKLIGHT_PWM_TIM->EGR = TIM_EGR_UG;
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pwm_period = LED_PWM_TIM_PERIOD;
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TIM_OC_InitTypeDef TIM_OC_InitStructure;
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TIM_OC_InitStructure.Pulse = 0;
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TIM_OC_InitStructure.OCMode = BACKLIGHT_PWM_TIM_OCMODE;
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TIM_OC_InitStructure.OCPolarity = TIM_OCPOLARITY_HIGH;
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TIM_OC_InitStructure.OCFastMode = TIM_OCFAST_DISABLE;
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TIM_OC_InitStructure.OCNPolarity = TIM_OCNPOLARITY_HIGH;
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TIM_OC_InitStructure.OCIdleState = TIM_OCIDLESTATE_SET;
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TIM_OC_InitStructure.OCNIdleState = TIM_OCNIDLESTATE_SET;
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HAL_TIM_PWM_ConfigChannel(&TIM_Handle, &TIM_OC_InitStructure,
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BACKLIGHT_PWM_TIM_CHANNEL);
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/* Set the Preload enable bit for channel1 */
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BACKLIGHT_PWM_TIM->CCMR1 |= TIM_CCMR1_OC1PE;
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/* Configure the Output Fast mode */
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BACKLIGHT_PWM_TIM->CCMR1 &= ~TIM_CCMR1_OC1FE;
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BACKLIGHT_PWM_TIM->CCMR1 |= TIM_OCFAST_DISABLE;
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uint32_t tmpccmrx;
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uint32_t tmpccer;
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uint32_t tmpcr2;
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/* Get the TIMx CCER register value */
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tmpccer = BACKLIGHT_PWM_TIM->CCER;
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/* Disable the Channel 1: Reset the CC1E Bit */
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BACKLIGHT_PWM_TIM->CCER &= ~TIM_CCER_CC1E;
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tmpccer |= TIM_CCER_CC1E;
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/* Get the TIMx CR2 register value */
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tmpcr2 = BACKLIGHT_PWM_TIM->CR2;
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/* Get the TIMx CCMR1 register value */
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tmpccmrx = BACKLIGHT_PWM_TIM->CCMR1;
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/* Reset the Output Compare Mode Bits */
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tmpccmrx &= ~TIM_CCMR1_OC1M;
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tmpccmrx &= ~TIM_CCMR1_CC1S;
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/* Select the Output Compare Mode */
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tmpccmrx |= BACKLIGHT_PWM_TIM_OCMODE;
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/* Reset the Output Polarity level */
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tmpccer &= ~TIM_CCER_CC1P;
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/* Set the Output Compare Polarity */
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tmpccer |= TIM_OCPOLARITY_HIGH;
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if (IS_TIM_CCXN_INSTANCE(BACKLIGHT_PWM_TIM, TIM_CHANNEL_1)) {
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/* Check parameters */
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assert_param(IS_TIM_OCN_POLARITY(OC_Config->OCNPolarity));
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/* Reset the Output N Polarity level */
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tmpccer &= ~TIM_CCER_CC1NP;
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/* Set the Output N Polarity */
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tmpccer |= TIM_OCNPOLARITY_HIGH;
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/* Set the Output N State */
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tmpccer |= TIM_CCER_CC1NE;
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}
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if (IS_TIM_BREAK_INSTANCE(BACKLIGHT_PWM_TIM)) {
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/* Check parameters */
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assert_param(IS_TIM_OCNIDLE_STATE(OC_Config->OCNIdleState));
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assert_param(IS_TIM_OCIDLE_STATE(OC_Config->OCIdleState));
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/* Reset the Output Compare and Output Compare N IDLE State */
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tmpcr2 &= ~TIM_CR2_OIS1;
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tmpcr2 &= ~TIM_CR2_OIS1N;
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/* Set the Output Idle state */
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tmpcr2 |= TIM_OCIDLESTATE_SET;
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/* Set the Output N Idle state */
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tmpcr2 |= TIM_OCNIDLESTATE_SET;
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}
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/* Write to TIMx CR2 */
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BACKLIGHT_PWM_TIM->CR2 = tmpcr2;
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/* Write to TIMx CCMR1 */
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BACKLIGHT_PWM_TIM->CCMR1 = tmpccmrx;
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/* Set the Capture Compare Register value */
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BACKLIGHT_PWM_TIM->CCR1 = 0;
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/* Write to TIMx CCER */
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BACKLIGHT_PWM_TIM->CCER = tmpccer;
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backlight_pwm_set(0);
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HAL_TIM_PWM_Start(&TIM_Handle, BACKLIGHT_PWM_TIM_CHANNEL);
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HAL_TIMEx_PWMN_Start(&TIM_Handle, BACKLIGHT_PWM_TIM_CHANNEL);
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BACKLIGHT_PWM_TIM->BDTR |= TIM_BDTR_MOE;
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BACKLIGHT_PWM_TIM->CR1 |= TIM_CR1_CEN;
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}
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void backlight_pwm_reinit(void) {
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tychovrahe
6 months ago
committed by