代码：
#include "main.h"
#include "tim.h"
#include "usart.h"
#include "gpio.h"
uint8_t i = 0;
float Duty = 0;
float Frequency = 0;
uint16_t Cap_val1 = 0;
uint16_t Cap_val2 = 0;
int main(void)
{
HAL_Init();
SystemClock_Config();
MX_GPIO_Init();
MX_TIM1_Init();
MX_TIM3_Init();
MX_USART1_UART_Init();
MX_TIM2_Init();
/* USER CODE BEGIN WHILE */
printf("串口通信测试\r\n");
HAL_TIM_Base_Start_IT(&htim2); // 使能定时器及其更新中断
HAL_TIM_PWM_Start(&htim3, TIM_CHANNEL_1); // 使能定时器及其PWM输出
HAL_TIM_IC_Start_IT(&htim1, TIM_CHANNEL_1); // 使能定时器及其输入捕获
HAL_TIM_IC_Start_IT(&htim1, TIM_CHANNEL_2); // 使能定时器及其输入捕获
__HAL_TIM_SET_COMPARE(&htim3, TIM_CHANNEL_1, 10); // 设置一个PWM波形进行测量
while (1)
{
// 串口发送 频率 占空比
printf("Cap_val1 is :%d , Cap_val2 is : %d \r\n", Cap_val1, Cap_val2);
printf("Duty is :%0.2f%% Frequency is : %0.2f ms\r\n", Duty, Frequency);
HAL_Delay(1000);
}
}
// 定时TIM2 定时亮灯的中断函数
void HAL_TIM_PeriodElapsedCallback(TIM_HandleTypeDef *tim)
{
if (tim == &htim2)
{
HAL_GPIO_TogglePin(GPIOC, GPIO_PIN_13);
}
}
// 定时输入捕获回调函数 计算占空比和频率
void HAL_TIM_IC_CaptureCallback(TIM_HandleTypeDef *htim)
{
if (htim->Instance == TIM1)
{
if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_1)
{
Cap_val1 = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_1);
}
if (htim->Channel == HAL_TIM_ACTIVE_CHANNEL_2)
{
Cap_val2 = HAL_TIM_ReadCapturedValue(htim, TIM_CHANNEL_2);
Duty = 100 - (float)Cap_val2 / (float)Cap_val1 * 100;
Frequency = 0.001 * Cap_val1;
}
}
}
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