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#include "backlight_pwm.h"
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#include STM32_HAL_H
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#include TREZOR_BOARD
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#define LED_PWM_TIM_PERIOD \
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(255) // little less than 4kHz with PSC = (SystemCoreClock / 1000000) - 1)
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#define LED_PWM_SLOW_TIM_PERIOD \
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(10000) // about 10Hz (with PSC = (SystemCoreClock / 1000000) - 1)
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static int BACKLIGHT = -1;
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static int pwm_period = LED_PWM_TIM_PERIOD;
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int backlight_pwm_set(int val) {
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if (BACKLIGHT != val && val >= 0 && val <= 255) {
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BACKLIGHT = val;
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TIM1->CCR1 = pwm_period * val / 255;
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}
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return BACKLIGHT;
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}
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void backlight_pwm_init(void) {
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// init peripherals
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__HAL_RCC_GPIOA_CLK_ENABLE();
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__HAL_RCC_TIM1_CLK_ENABLE();
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GPIO_InitTypeDef GPIO_InitStructure;
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// LCD_PWM/PA7 (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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GPIO_InitStructure.Alternate = GPIO_AF1_TIM1;
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GPIO_InitStructure.Pin = GPIO_PIN_7;
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HAL_GPIO_Init(GPIOA, &GPIO_InitStructure);
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// enable PWM timer
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TIM_HandleTypeDef TIM1_Handle;
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TIM1_Handle.Instance = TIM1;
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TIM1_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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TIM1_Handle.Init.Prescaler = SystemCoreClock / 1000000 - 1;
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TIM1_Handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
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TIM1_Handle.Init.CounterMode = TIM_COUNTERMODE_UP;
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TIM1_Handle.Init.RepetitionCounter = 0;
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HAL_TIM_PWM_Init(&TIM1_Handle);
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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 = TIM_OCMODE_PWM2;
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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(&TIM1_Handle, &TIM_OC_InitStructure, TIM_CHANNEL_1);
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backlight_pwm_set(0);
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HAL_TIM_PWM_Start(&TIM1_Handle, TIM_CHANNEL_1);
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HAL_TIMEx_PWMN_Start(&TIM1_Handle, TIM_CHANNEL_1);
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}
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void backlight_pwm_reinit(void) {
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uint32_t prev_arr = TIM1->ARR;
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uint32_t prev_ccr1 = TIM1->CCR1;
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uint8_t prev_val = (prev_ccr1 * 255) / prev_arr;
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BACKLIGHT = prev_val;
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pwm_period = LED_PWM_TIM_PERIOD;
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TIM1->CR1 |= TIM_CR1_ARPE;
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TIM1->CR2 |= TIM_CR2_CCPC;
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TIM1->CCR1 = pwm_period * prev_val / 255;
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TIM1->ARR = LED_PWM_TIM_PERIOD - 1;
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}
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void backlight_pwm_set_slow(void) {
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uint32_t prev_arr = TIM1->ARR;
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uint32_t prev_ccr1 = TIM1->CCR1;
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uint8_t prev_val = (prev_ccr1 * 255) / prev_arr;
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pwm_period = LED_PWM_SLOW_TIM_PERIOD;
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TIM1->CR1 |= TIM_CR1_ARPE;
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TIM1->CR2 |= TIM_CR2_CCPC;
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TIM1->ARR = LED_PWM_SLOW_TIM_PERIOD - 1;
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TIM1->CCR1 = pwm_period * prev_val / 255;
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}
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#ifndef CORE_BACKLIGHT_H
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#define CORE_BACKLIGHT_H
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#include "common.h"
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int backlight_pwm_set(int val);
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int backlight_pwm_get(void);
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void backlight_pwm_init(void);
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void backlight_pwm_reinit(void);
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void backlight_pwm_set_slow(void);
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#endif // CORE_BACKLIGHT_H
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Reference in new issue