利用GD32F470的定时器实现频率和占空比测试

本文主要是介绍利用GD32F470的定时器实现频率和占空比测试，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

1）main函数代码如下：

#include "gd32f4xx.h"
#include <stdio.h>
#include "gd32f470i_eval.h"
#include "systick.h"void TIM_PwmInit(void)
{rcu_periph_clock_enable(RCU_GPIOA);/* PWM输出管脚为复用推挽模式 */gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE,GPIO_PIN_1);gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_1);gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_1);/* PWM输入管脚为浮空输入模式 */gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_NONE,GPIO_PIN_6);gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_6);gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_6);/* TIMER1初始化 */timer_oc_parameter_struct timer_ocintpara = {0};timer_parameter_struct timer_initpara = {0};rcu_periph_clock_enable(RCU_TIMER1);timer_deinit(TIMER1);timer_initpara.prescaler         = (108 - 1);  // 预分频：108MHz / 108 = 1MHztimer_initpara.alignedmode       = TIMER_COUNTER_EDGE;  // 边沿对齐计数timer_initpara.counterdirection  = TIMER_COUNTER_UP;  // 向上计数timer_initpara.period            = (1000 - 1);  // 周期：1MHz / 1000 = 1000Hz  注: 下面设置的占空比必须小于等于period,否则错误;timer_init(TIMER1, &timer_initpara);/* 配置所有通道为PWM模式0 */timer_ocintpara.ocpolarity   = TIMER_OC_POLARITY_HIGH;  // 通道输出极性高，即高电平有效timer_ocintpara.outputstate  = TIMER_CCX_ENABLE;  // 使能输出通道timer_ocintpara.ocidlestate  = TIMER_OC_IDLE_STATE_LOW;  // 输出通道空闲低电平timer_channel_output_config(TIMER1,TIMER_CH_1, &timer_ocintpara);/* 配置通道1为25%占空比 */timer_channel_output_pulse_value_config(TIMER1, TIMER_CH_1, (250 - 1));  // 250 / 1000 = 25%timer_channel_output_mode_config(TIMER1,TIMER_CH_1, TIMER_OC_MODE_PWM0);  // 配置为PWM模式0timer_channel_output_shadow_config(TIMER1,TIMER_CH_1, TIMER_OC_SHADOW_DISABLE);  // 关闭输出影子timer_auto_reload_shadow_enable(TIMER1);  // 使能重装载影子timer_enable(TIMER1);  // 使能定时器1/* 初始化TIMER2 */timer_ic_parameter_struct timer_icinitpara = {0};rcu_periph_clock_enable(RCU_TIMER2);timer_deinit(TIMER2);timer_initpara.prescaler         = (108 - 1);  // 预分频：108MHz / 108 = 1MHztimer_initpara.alignedmode       = TIMER_COUNTER_EDGE;  // 边沿对齐计数timer_initpara.counterdirection  = TIMER_COUNTER_UP;  // 向上计数模式timer_initpara.period            = (65536 - 1);  // 周期最好设置为最高，以免计数器溢出timer_initpara.clockdivision     = TIMER_CKDIV_DIV1;  // 输入时钟1分频timer_init(TIMER2,&timer_initpara);timer_icinitpara.icpolarity  = TIMER_IC_POLARITY_RISING;  // 输入极性为上升沿，即上升沿有效timer_icinitpara.icselection = TIMER_IC_SELECTION_DIRECTTI;  // 输入捕获通道连接至CIxtimer_icinitpara.icprescaler = TIMER_IC_PSC_DIV1;  // 时钟1分频timer_icinitpara.icfilter    = 0x0;timer_input_pwm_capture_config(TIMER2, TIMER_CH_0, &timer_icinitpara);timer_input_trigger_source_select(TIMER2, TIMER_SMCFG_TRGSEL_CI0FE0);  // 输入触发源为通道0timer_slave_mode_select(TIMER2, TIMER_SLAVE_MODE_RESTART);  // 从模式选择为复位模式timer_master_slave_mode_config(TIMER2, TIMER_MASTER_SLAVE_MODE_ENABLE);  // 使能从模式timer_auto_reload_shadow_enable(TIMER2);  // 使能重装载影子nvic_priority_group_set(NVIC_PRIGROUP_PRE4_SUB0);  // 抢占优先级4位，响应优先级0位nvic_irq_enable(TIMER2_IRQn, 1, 0);  // 使能中断服务，抢占优先级为1timer_interrupt_flag_clear(TIMER2, TIMER_INT_CH0);  // 清除通道0中断标志位timer_interrupt_enable(TIMER2, TIMER_INT_CH0);  // 使能通道0中断timer_enable(TIMER2);  // 使能定时器2
}int fputc(int ch, FILE *f)
{usart_data_transmit(EVAL_COM0, (uint8_t)ch);while (RESET == usart_flag_get(EVAL_COM0, USART_FLAG_TBE));return ch;
}extern __IO uint16_t dutycycle;
extern __IO uint16_t frequency;
int main(void)
{systick_config();TIM_PwmInit();gd_eval_com_init(EVAL_COM0);while(1){printf("dutycycle: %d%%, frequency: %dHz\n", dutycycle, frequency);delay_1ms(1000);}
}

2）中断函数如下所示(gd32f4xx_it.c)：

uint32_t ic1value = 0, ic2value = 0;
__IO uint16_t dutycycle = 0;
__IO uint16_t frequency = 0;void TIMER2_IRQHandler(void)
{if(SET == timer_interrupt_flag_get(TIMER2, TIMER_INT_CH0)){timer_interrupt_flag_clear(TIMER2, TIMER_INT_CH0);  // 清除中断标志位ic1value = timer_channel_capture_value_register_read(TIMER2, TIMER_CH_0) + 1;if(0 != ic1value){ic2value = timer_channel_capture_value_register_read(TIMER2, TIMER_CH_1) + 1;dutycycle = (ic2value * 100) / ic1value;  // 计算占空比frequency = (float)1000000 / ic1value;  // 计算频率}else{dutycycle = 0;frequency = 0;}}
}