include "Key.h" /* ---------------------------------------------------------------------------- * @breif:发送按键信息给从机 * @input:NONE * @retval:NONE */ void Send_Key_Inf(void) { uint16_t crc16=0; //校验码 if(sending_flag[USART1_Locat] == 0) { //没有报文正在发送 if(Dealwith.Key1_REG != 0 || Dealwith.Key2_REG != 0) { //有按键按下 Txbuf[0] = SLAVE_ADDRESS; //装置地址 Txbuf[1] = MOD_WRITE_M_REGISTER; Txbuf[2] = (uint8_t)(ADR_KEY_START>>8); Txbuf[3] = (uint8_t)(ADR_KEY_START); Txbuf[4] = 0x00; Txbuf[5] = 0x02; Txbuf[6] = 0x04; Txbuf[7] = (uint8_t)(Dealwith.Key1_REG>>8); Txbuf[8] = (uint8_t)(Dealwith.Key1_REG); Txbuf[9] = (uint8_t)(Dealwith.Key2_REG>>8); Txbuf[10] = (uint8_t)(Dealwith.Key2_REG); crc16 = CRC16(Txbuf,11); Txbuf[11] = (uint8_t)(crc16); Txbuf[12] = (uint8_t)(crc16>>8); Txlen = 13; //发送数据 DMA_Usart1_Send(Txbuf,Txlen); } } }将代码修改为被动发送数据

下面是将代码修改为被动发送数据的版本：

#include "Key.h"

/* ----------------------------------------------------------------------------
 * @brief:发送按键信息给从机
 * @input:NONE
 * @retval:NONE
 */
void Send_Key_Inf(void)
{
    uint16_t crc16 = 0;         //校验码
    
    if (sending_flag[USART1_Locat] == 0)
    {
        //没有报文正在发送

        if (Dealwith.Key1_REG != 0 || Dealwith.Key2_REG != 0)
        {
            //有按键按下

            Txbuf[0] = SLAVE_ADDRESS;                     //装置地址
            Txbuf[1] = MOD_WRITE_M_REGISTER;
            Txbuf[2] = (uint8_t)(ADR_KEY_START >> 8); 
            Txbuf[3] = (uint8_t)(ADR_KEY_START); 
            Txbuf[4] = 0x00; 
            Txbuf[5] = 0x02; 
            Txbuf[6] = 0x04; 

            Txbuf[7] = (uint8_t)(Dealwith.Key1_REG >> 8);
            Txbuf[8] = (uint8_t)(Dealwith.Key1_REG);
            Txbuf[9] = (uint8_t)(Dealwith.Key2_REG >> 8);
            Txbuf[10] = (uint8_t)(Dealwith.Key2_REG);

            crc16 = CRC16(Txbuf, 11);
            Txbuf[11] = (uint8_t)(crc16);
            Txbuf[12] = (uint8_t)(crc16 >> 8);
            Txlen = 13;

            //发送数据
            DMA_Usart1_Send(Txbuf, Txlen);
            
            // 设置发送标志位，表示数据已被动发送
            sending_flag[USART1_Locat] = 1;
        }
    }
}

这里将原来的代码加了一行 `sending_flag[USART1_Locat] = 1;` ，设置发送标志位，表示数据已被动发送。这样在下次调用 `Send_Key_Inf` 函数时，会先检查 `sending_flag` 标志位，如果为1，则说明数据已经被动发送，不会再次发送。这样就实现了被动发送数据的功能。