ARM32开发——PWM高级定时器

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文章目录

需求

点亮2个灯，采用互补pwm的方式

高级定时器通道互补输出

开发流程

添加Timer依赖
初始化PWM
配置通道的P极和N极
PWM占空比控制

通道配置

void timer_channel_config(uint32_t timer_periph, uint16_t channel) {
  /* TIMER 通道输出配置 */
  timer_oc_parameter_struct ocpara;
  /* initialize TIMER channel output parameter struct */
  timer_channel_output_struct_para_init(&ocpara);
  ocpara.outputstate  = TIMER_CCX_ENABLE;        // OP Enable
  ocpara.outputnstate = TIMER_CCXN_ENABLE;       // ON Enable
  ocpara.ocpolarity   = TIMER_OC_POLARITY_HIGH;   // OP Polarity
  ocpara.ocnpolarity  = TIMER_OCN_POLARITY_HIGH;  // ON Polarity
  /* 配置输出参数 configure TIMER channel output function */
  timer_channel_output_config(timer_periph, channel, &ocpara);
  /* 配置通道输出输出比较模式 configure TIMER channel output compare mode */
  timer_channel_output_mode_config(timer_periph, channel, TIMER_OC_MODE_PWM0);
}

● ocnpolarity：N极性电平

● ocpolarity：P极性电平

打开互补保护电路

// break 只针对高级定时器TIMER0 & TIMER7，打开互补保护电路
/* TIMER通道互补保护电路 */
timer_break_parameter_struct breakpara;
/* 初始化TIMER break参数结构体 */
timer_break_struct_para_init(&breakpara);
/* break输入的极性 HIGH */
breakpara.breakpolarity   = TIMER_BREAK_POLARITY_HIGH;
/* 输出自动的启用 */
breakpara.outputautostate = TIMER_OUTAUTO_ENABLE;
/* break输入的启用*/
breakpara.breakstate      = TIMER_BREAK_ENABLE;
/* 配置TIMER0 break */
timer_break_config(TIMER0, &breakpara);
/* 启用TIMER0 break */
timer_break_enable(TIMER0);

完整代码

#include "gd32f4xx.h"
#include "systick.h"
#include <stdio.h>
#include "main.h"
#include "USART0.h"

void USART0_on_recv(uint8_t* data, uint32_t len) {
  printf("g_rx_buffer: %s g_rx_cnt:%d \n", data, len);
}

static void GPIO_config() {
  rcu_periph_clock_enable(RCU_GPIOC);
  gpio_mode_set(GPIOC, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_6);
  gpio_output_options_set(GPIOC, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_6);

  gpio_bit_reset(GPIOC, GPIO_PIN_6);
  
//  rcu_periph_clock_enable(RCU_GPIOD);
//  gpio_mode_set(GPIOD, GPIO_MODE_INPUT, GPIO_PUPD_NONE, GPIO_PIN_8 | GPIO_PIN_9);
}

void timer_gpio_config(uint32_t gpio_rcu, uint32_t gpio_port, uint32_t gpio_pin, uint32_t gpio_af) {
  rcu_periph_clock_enable(gpio_rcu);
  /* 设置gpio模式 */
  gpio_mode_set(gpio_port, GPIO_MODE_AF, GPIO_PUPD_NONE, gpio_pin);
  gpio_output_options_set(gpio_port, GPIO_OTYPE_PP, GPIO_OSPEED_MAX, gpio_pin);
  gpio_af_set(gpio_port, gpio_af, gpio_pin);
}

void timer_init_config(rcu_periph_enum rcu_periph, uint32_t timer_periph,
                       uint16_t t_prescaler, uint32_t t_period) {

  rcu_periph_clock_enable(rcu_periph);
  timer_deinit(timer_periph);
  /*初始化参数 */
  timer_parameter_struct initpara;
  /* initialize TIMER init parameter struct */
  timer_struct_para_init(&initpara);
  /* 根据需要配置值 分频系数 （可以实现更低的timer频率） */
  initpara.prescaler 	= t_prescaler - 1;
  /* 1个周期的计数(period Max: 65535) Freq > 3662  */
  initpara.period		= t_period - 1;
  /* initialize TIMER counter */
  timer_init(timer_periph, &initpara);
  /* enable a TIMER */
  timer_enable(timer_periph);

}

void timer_channel_config(uint32_t timer_periph, uint16_t channel) {
  /* TIMER 通道输出配置 */
  timer_oc_parameter_struct ocpara;
  /* initialize TIMER channel output parameter struct */
  timer_channel_output_struct_para_init(&ocpara);
  ocpara.outputstate  = TIMER_CCX_ENABLE;        // OP Enable
  ocpara.outputnstate = TIMER_CCXN_ENABLE;       // ON Enable
  ocpara.ocpolarity   = TIMER_OC_POLARITY_HIGH;   // OP Polarity
  ocpara.ocnpolarity  = TIMER_OCN_POLARITY_HIGH;  // ON Polarity
  /* 配置输出参数 configure TIMER channel output function */
  timer_channel_output_config(timer_periph, channel, &ocpara);
  /* 配置通道输出输出比较模式 configure TIMER channel output compare mode */
  timer_channel_output_mode_config(timer_periph, channel, TIMER_OC_MODE_PWM0);
}


// PWM
#define	PRESCALER		1
#define	FREQ			  10000
#define PERIOD			(SystemCoreClock / FREQ)

// LED1 TM0CH1 PE9  OP
// LED2 TM0CH0 PE8  ON
static void Timer_config() {
  // 定时器

  // GPIO ----------------------------------------
  timer_gpio_config(RCU_GPIOE, GPIOE, GPIO_PIN_9, GPIO_AF_1);
  timer_gpio_config(RCU_GPIOE, GPIOE, GPIO_PIN_8, GPIO_AF_1);

  // TIMER----------------------------------------
  /* 升级频率*/
  rcu_timer_clock_prescaler_config(RCU_TIMER_PSC_MUL4);
  timer_init_config(RCU_TIMER0, TIMER0, PRESCALER, PERIOD); // 与通道无关

  // TIMER channel-------------------------------
  timer_channel_config(TIMER0, TIMER_CH_0);
  
  // Break --------------------------------------------------
  // break 只针对高级定时器TIMER0 & TIMER7，打开互补保护电路
  /* TIMER通道互补保护电路 */
  timer_break_parameter_struct breakpara;
  /* 初始化TIMER break参数结构体 */
  timer_break_struct_para_init(&breakpara);
  /* break输入的极性 HIGH */
  breakpara.breakpolarity   = TIMER_BREAK_POLARITY_HIGH;
  /* 输出自动的启用 */
  breakpara.outputautostate = TIMER_OUTAUTO_ENABLE;
  /* break输入的启用*/
  breakpara.breakstate      = TIMER_BREAK_ENABLE;
  
  /* 配置TIMER0 break */
  timer_break_config(TIMER0, &breakpara);
  /* 启用TIMER0 break */
  timer_break_enable(TIMER0);


}

/**********************************************************
 * @brief 更新pwm占空比
 * @param timer_periph 定时器
 * @param channel 通道
 * @param duty  占空比[0, 100]
 * @return 
 **********************************************************/
void PWM_update(uint32_t timer_periph, uint16_t channel, float duty) { // 0-100

  if(duty > 100) duty = 100;
  else if(duty < 0) duty = 0;

//	pulse / PERIOD == duty / 100
  uint32_t pulse = PERIOD * duty / 100.0f - 1;

  // 计数值 65535
  timer_channel_output_pulse_value_config(timer_periph, channel, pulse);
}

int main(void)
{
  systick_config();
  USART0_init();

  // 拉低总开关
//  GPIO_config();

  Timer_config();
  printf("Init Complete!\n");

  float duty = 0;
  int8_t dir = 1;
  while(1) {
    PWM_update(TIMER0, TIMER_CH_0, duty);

    if (duty >= 100) {
      dir = -1;
    } else if (duty <= 0) {
      dir = 1;
    }
    duty += dir;

    printf("duty: %.2f \n", duty);

    delay_1ms(10);
  }
}