stm32 使用定时器定时500ms 循环发送2组数

以下是使用STM32定时器定时500ms循环发送2组数的代码示例：

#include "stm32f4xx.h"

#define LED_GREEN GPIO_Pin_12
#define LED_ORANGE GPIO_Pin_13
#define LED_RED GPIO_Pin_14
#define LED_BLUE GPIO_Pin_15

#define USART_TX_PIN GPIO_Pin_9
#define USART_RX_PIN GPIO_Pin_10

USART_InitTypeDef USART_InitStruct;
GPIO_InitTypeDef GPIO_InitStruct;
NVIC_InitTypeDef NVIC_InitStruct;
TIM_TimeBaseInitTypeDef TIM_TimeBaseInitStruct;

uint16_t data1[2] = {0x01, 0x02};
uint16_t data2[2] = {0x03, 0x04};

void GPIO_Config(void) {
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);
    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);

    GPIO_InitStruct.GPIO_Pin = LED_GREEN | LED_ORANGE | LED_RED | LED_BLUE;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_Init(GPIOD, &GPIO_InitStruct);

    GPIO_InitStruct.GPIO_Pin = USART_TX_PIN | USART_RX_PIN;
    GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
    GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(GPIOA, &GPIO_InitStruct);

    GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
    GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
}

void USART_Config(void) {
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

    USART_InitStruct.USART_BaudRate = 115200;
    USART_InitStruct.USART_WordLength = USART_WordLength_8b;
    USART_InitStruct.USART_StopBits = USART_StopBits_1;
    USART_InitStruct.USART_Parity = USART_Parity_No;
    USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
    USART_InitStruct.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
    USART_Init(USART1, &USART_InitStruct);

    USART_Cmd(USART1, ENABLE);
}

void NVIC_Config(void) {
    NVIC_InitStruct.NVIC_IRQChannel = TIM2_IRQn;
    NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStruct);
}

void TIM_Config(void) {
    RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE);

    TIM_TimeBaseInitStruct.TIM_Prescaler = 84 - 1;
    TIM_TimeBaseInitStruct.TIM_CounterMode = TIM_CounterMode_Up;
    TIM_TimeBaseInitStruct.TIM_Period = 500 - 1;
    TIM_TimeBaseInitStruct.TIM_ClockDivision = TIM_CKD_DIV1;
    TIM_TimeBaseInit(TIM2, &TIM_TimeBaseInitStruct);

    TIM_ITConfig(TIM2, TIM_IT_Update, ENABLE);

    TIM_Cmd(TIM2, ENABLE);
}

void send_data(uint16_t *data, uint8_t len) {
    for (uint8_t i = 0; i < len; i++) {
        USART_SendData(USART1, data[i]);
        while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
    }
}

void TIM2_IRQHandler(void) {
    if (TIM_GetITStatus(TIM2, TIM_IT_Update) != RESET) {
        TIM_ClearITPendingBit(TIM2, TIM_IT_Update);

        GPIO_ToggleBits(GPIOD, LED_GREEN);

        send_data(data1, 2);
        send_data(data2, 2);
    }
}

int main(void) {
    GPIO_Config();
    USART_Config();
    NVIC_Config();
    TIM_Config();

    while (1);
}

这个程序中，我们使用了STM32的定时器2来实现定时500ms的功能。在定时器中断中，我们通过USART1串口发送了两组数据data1和data2，每组数据包含两个16位的无符号整数。我们还使用了STM32的GPIO来控制4个LED灯的亮灭。在主函数中，我们只需要调用GPIO、USART、NVIC和TIM的配置函数即可。在while循环中，我们什么也不做，只是让程序不停止运行。