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文章目录
- 需求
- 高级定时器通道互补输出
- 开发流程
- 通道配置
- 打开互补保护电路
- 完整代码
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);
}
}
