keil5rs485发送数组

以下是在Keil 5中使用RS485发送数组的示例代码：

#include<stm32f4xx.h>
#include<stdio.h>

#define RS485_UART USART3 //定义RS485所使用的USART
#define RS485_DIR_PIN GPIO_Pin_15 //定义RS485转换方向控制引脚
#define RS485_DIR_PORT GPIOA //定义RS485转换方向控制引脚所在的端口

void RS485_Init(void)
{
    USART_InitTypeDef USART_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;

    RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); //使能GPIOA时钟

    //配置PA15为推挽输出引脚
    GPIO_InitStructure.GPIO_Pin = RS485_DIR_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
    GPIO_Init(RS485_DIR_PORT, &GPIO_InitStructure);

    RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); //使能USART3时钟

    //USART3配置
    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_Rx | USART_Mode_Tx;
    USART_Init(RS485_UART, &USART_InitStructure);

    USART_Cmd(RS485_UART, ENABLE); //使能USART3
}

void RS485_SendArray(u8 *data, u8 len)
{
    GPIO_SetBits(RS485_DIR_PORT, RS485_DIR_PIN); //设置RS485为发送状态

    for (u8 i = 0; i < len; i++)
    {
        USART_SendData(RS485_UART, data[i]); //向USART3发送数据
        while (USART_GetFlagStatus(RS485_UART, USART_FLAG_TXE) == RESET); //等待发送完成
    }

    while (USART_GetFlagStatus(RS485_UART, USART_FLAG_TC) == RESET); //等待发送完成

    GPIO_ResetBits(RS485_DIR_PORT, RS485_DIR_PIN); //设置RS485为接收状态
}

int main(void)
{
    RS485_Init(); //初始化RS485

    u8 data[] = {0x01, 0x02, 0x03, 0x04, 0x05}; //定义要发送的数组
    RS485_SendArray(data, sizeof(data)); //发送数组数据

    while (1);
}

在上述代码中，首先通过`RS485_Init()`函数初始化RS485的USART和控制引脚。然后，通过`RS485_SendArray()`函数发送数组数据。在发送数组数据之前，需要设置RS485为发送状态，发送完数据后，再将RS485设置为接收状态。