stm32 使用定时器间隔500ms 循环发送2组数
时间: 2024-01-21 16:04:35 浏览: 22
以下是基于STM32的代码示例,使用定时器间隔500ms循环发送2组数:
```
#include "stm32f10x.h"
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "stm32f10x_usart.h"
#include "stm32f10x_tim.h"
int main(void)
{
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure;
// 初始化时钟
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
// 配置串口GPIO
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 配置串口
USART_InitStructure.USART_BaudRate = 115200;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
// 配置定时器
TIM_TimeBaseStructure.TIM_Period = 9999; // 1ms中断
TIM_TimeBaseStructure.TIM_Prescaler = 719; // 72MHz计数器时钟
TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up;
TIM_TimeBaseStructure.TIM_ClockDivision = TIM_CKD_DIV1;
TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure);
TIM_Cmd(TIM2, ENABLE);
uint32_t count = 0;
while(1)
{
if(TIM_GetFlagStatus(TIM2, TIM_FLAG_Update) == SET)
{
TIM_ClearFlag(TIM2, TIM_FLAG_Update);
count++;
if(count == 1000) // 500ms
{
count = 0;
uint8_t data1[2] = {0x01, 0x02};
uint8_t data2[2] = {0x03, 0x04};
USART_SendData(USART1, data1[0]);
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, data1[1]);
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, data2[0]);
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
USART_SendData(USART1, data2[1]);
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
}
}
}
}
```
在这个示例中,我们使用了定时器2以1ms的频率计数,并且在500ms时发送两组数据。每次发送数据时,我们使用USART_SendData函数向串口发送数据。我们还通过USART_GetFlagStatus函数检查是否已经发送完成,以确保数据被正确发送。请注意,本示例只发送了两个字节,如果需要发送更多字节,需要根据实际情况进行修改。