player/Project/Src/Drive/Source/lcd_pwm.c

/***
 ***************************************************************************
 *	@file  	lcd_pwm.c
 *	@brief
 * <EFBFBD><EFBFBD>ʱ<EFBFBD><EFBFBD><EFBFBD><EFBFBD>ʼ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>pwm,<EFBFBD><EFBFBD>ΪLCD<EFBFBD>ı<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>,<EFBFBD><EFBFBD>PWM<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ÿı䣬<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD>޸<EFBFBD><EFBFBD><EFBFBD><EFBFBD>صĺ<EFBFBD><EFBFBD>⣬
 *				<EFBFBD><EFBFBD><EFBFBD><EFBFBD>Ҫ<EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ij<EFBFBD><EFBFBD><EFBFBD>Ӧͨ<EFBFBD><EFBFBD><EFBFBD>ĺ<EFBFBD><EFBFBD><EFBFBD> <EFBFBD><EFBFBD>
 *				TIM_OC2Init();
 *				TIM_OC2PreloadConfig();
 *				TIM_SetCompare2();
 ******************************************************************************
 *
 *
 *
 *
 ***************************************************************************
 ***/
#include "lcd_pwm.h"
#include "stm32f4xx.h"

static uint16_t LCD_PwmPeriod = 500;       // <20><>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ
static uint32_t LCD_PwmPrescaler = 90 - 1; // <20><>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD>Ƶֵ
static uint8_t g_pulse = 100;

// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>TIM4 PWM CH2 IO<49>ڳ<EFBFBD>ʼ<EFBFBD><CABC>
//
void LCD_PWM_GPIO(void) {
  GPIO_InitTypeDef GPIO_InitStructure;
  // IO<49><4F>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
  RCC_AHB1PeriphClockCmd(LCD_PWM_CLK, ENABLE);

  // IO<49><4F><EFBFBD>Ÿ<EFBFBD><C5B8><EFBFBD>
  GPIO_PinAFConfig(LCD_PWM_PORT, LCD_PWM_PinSource, LCD_PWM_AF);

  // IO<49><4F><EFBFBD><EFBFBD>
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;     // <20><><EFBFBD><EFBFBD>
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;       // <20><><EFBFBD><EFBFBD>
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; // <20>ٶ<EFBFBD>

  // <20><>ʼ<EFBFBD><CABC> TIM4_CH2 <20><><EFBFBD><EFBFBD>
  GPIO_InitStructure.GPIO_Pin = LCD_PWM_PIN;
  GPIO_Init(LCD_PWM_PORT, &GPIO_InitStructure);
}

// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>LCD PWM ռ<>ձ<EFBFBD><D5B1><EFBFBD><EFBFBD><EFBFBD>
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>pulse - ռ<>ձȣ<D5B1><C8A3><EFBFBD>Χ 0-100
//
void LCD_PwmSetPulse(uint8_t pulse) {
  uint16_t compareValue;
  g_pulse = pulse;
  compareValue = pulse * LCD_PwmPeriod / 100; // <20><><EFBFBD><EFBFBD>ռ<EFBFBD>ձ<EFBFBD><D5B1><EFBFBD><EFBFBD>ñȽ<C3B1>ֵ
  TIM_SetCompare2(LCD_TIM, compareValue);
}

// <20><>ȡ<EFBFBD><C8A1>Ļ<EFBFBD><C4BB><EFBFBD><EFBFBD>
uint8_t LCD_PwmGetPulse(void) { return g_pulse; }

// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>LCD PWM <20><>ʼ<EFBFBD><CABC>
//	<09><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>	pulse - LCD<43><44><EFBFBD><EFBFBD>ռ<EFBFBD>ձ<EFBFBD>
// ˵<><CBB5><EFBFBD><EFBFBD>LCD<43><44><EFBFBD><EFBFBD><EFBFBD><EFBFBD>PWMƵ<4D>ʹ̶<CAB9>Ϊ10KHz
//
void LCD_PWMinit(uint8_t pulse) {

  TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStructure;
  TIM_OCInitTypeDef TIM_OCInitStructure;
  g_pulse = pulse;
  LCD_PWM_GPIO();                              // <20><>ʼ<EFBFBD><CABC>IO<49><4F>
  RCC_APB1PeriphClockCmd(LCD_TIM_CLK, ENABLE); /// ʹ<><CAB9>ʱ<EFBFBD><CAB1>

  // <20><>ʱ<EFBFBD><CAB1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
  TIM_TimeBaseInitStructure.TIM_Period = LCD_PwmPeriod;       // <20><><EFBFBD><EFBFBD>ֵ
  TIM_TimeBaseInitStructure.TIM_Prescaler = LCD_PwmPrescaler; // <20><>Ƶϵ<C6B5><CFB5>
  TIM_TimeBaseInitStructure.TIM_CounterMode = TIM_CounterMode_Up; // <20><><EFBFBD>ϼ<EFBFBD><CFBC><EFBFBD>
  TIM_TimeBaseInitStructure.TIM_ClockDivision = TIM_CKD_DIV1;

  TIM_TimeBaseInit(LCD_TIM, &TIM_TimeBaseInitStructure); // <20><>ʼ<EFBFBD><CABC>

  // PWM<57><4D><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
  TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1;             // PWMģʽ1
  TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; // ʹ<>ܱȽ<DCB1><C8BD><EFBFBD><EFBFBD><EFBFBD>
  TIM_OCInitStructure.TIM_OCPolarity =
      TIM_OCPolarity_High; // С<><D0A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ֵ<EFBFBD><D6B5><EFBFBD><EFBFBD><EFBFBD>ߵ<EFBFBD>ƽ

  TIM_OC2Init(LCD_TIM, &TIM_OCInitStructure); // <20><>ʼ<EFBFBD><CABC><EFBFBD><EFBFBD>ʱ<EFBFBD><CAB1><EFBFBD>Ƚ<EFBFBD><C8BD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><CDA8> 2
  TIM_OC2PreloadConfig(LCD_TIM,
                       TIM_OCPreload_Enable); // <20>Զ<EFBFBD><D4B6><EFBFBD><EFBFBD>رȽ<D8B1><C8BD><EFBFBD><EFBFBD><EFBFBD>ͨ<EFBFBD><CDA8> 2 <20><>ֵ

  TIM_ARRPreloadConfig(LCD_TIM, ENABLE); // ʹ<><CAB9><EFBFBD>Զ<EFBFBD><D4B6><EFBFBD><EFBFBD><EFBFBD>

  TIM_Cmd(TIM4, ENABLE); // ʹ<>ܶ<EFBFBD>ʱ<EFBFBD><CAB1>

  LCD_PwmSetPulse(pulse); // <20><><EFBFBD><EFBFBD>ռ<EFBFBD>ձ<EFBFBD>
}