ARM32开发——PWM高级定时器

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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

1. 添加Timer依赖
2. 初始化PWM
3. 配置通道的P极和N极
4. 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 Enableocpara.outputnstate = TIMER_CCXN_ENABLE;       // ON Enableocpara.ocpolarity   = TIMER_OC_POLARITY_HIGH;   // OP Polarityocpara.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 Enableocpara.outputnstate = TIMER_CCXN_ENABLE;       // ON Enableocpara.ocpolarity   = TIMER_OC_POLARITY_HIGH;   // OP Polarityocpara.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) { // 0-100if(duty > 100) duty = 100;else if(duty < 0) duty = 0;//	pulse / PERIOD == duty / 100uint32_t pulse = PERIOD * duty / 100.0f - 1;// 计数值 65535timer_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);}
}