大神们。。。又遇到一个问题，我用串口助手PC发串口帧给STM32无返回。。。。。 我的帧定义如下：单片机接收的数据帧(其中不包括帧头：0x55)typedef struct{unsigned charucIndex; //从器件编号unsigned charucOprType; //操作类型，读00写01unsigned charucOprAddr2; //Addr2 地址低位unsigned charucOprAdd1； //Addr1 地址中间unsigned charucOprAdd0; //Addr0 地址高位unsigned charucOprDataLen; //len 数据长度（ucDataBuffer内的数据长度）unsigned charucXorValue; //Xor 校验数据（异或）unsigned charucDataBuffer[256]; //DataBuffer 数据}所有数据均为16进制即HEX，请自觉在前面加上0x）第一个字节为帧头0x55第二个字节代表操作从器件编码：00：selfTestResult（0xffff的状态字，如发55 00 则返回，后面位没用到）01： ADC02: IIC_INA22003: IIC_EEPROM04: EPLD_GPIO05: Ethernet（KSZ8041）06: FSMC_Flash(暂留)07: FSMC_SRAM(暂留)第三个字节代表读写操作类型：00-读，01-写第四个字节代表待读写寄存器的地址低位第五六个字节代表待读写寄存器的地址高位第七个字节代表数据长度第八个字节为第2,3,4,5,6,7,9个字节数据的异或，用于数据校验第九个字节代表往对应寄存器写入的数据（读命令下该字节无意义）注：所有命令下发正确后都会首先返回：AA 50 FF(EE)，文中描述的返回值皆是指在这之后的数据。AA：收到帧头 50：校验正确 FF：写入正确（EE：写入错误） 我的串口采用接收中断：串口配置：static void USART_Config(void){ USART_InitTypeDef USART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; u32 tm; /* USARTx configured as follows: - BaudRate = 115200 baud - Word Length = 8 Bits - One Stop Bit - No parity - Hardware flow control disabled (RTS and CTS signals) - Receive and transmit enabled */ 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; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); GPIO_PinAFConfig(GPIOA, GPIO_PinSource9,GPIO_AF_USART1); //PA9 GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1); //PA10 GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure.GPIO_Pin = (GPIO_Pin_9|GPIO_Pin_10); GPIO_Init(GPIOA,&GPIO_InitStructure); USART_Init(USART1, &USART_InitStructure); USART_Cmd(USART1, ENABLE); tm = GetTimeBaseMs(); while((GetTimeBaseMs() - tm) < 1){} USART_ClearFlag(USART1,USART_FLAG_TC); USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); ///********************USART4**************************/ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE); RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE); GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_UART4); //PC10 GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_UART4); //PC11 GPIO_InitStructure.GPIO_Pin = (GPIO_Pin_10|GPIO_Pin_11); GPIO_Init(GPIOC,&GPIO_InitStructure); USART_Init(UART4, &USART_InitStructure); //USART_ITConfig(UART4, USART_IT_RXNE, ENABLE); USART_Cmd(UART4, ENABLE); } 串口中断配置static void NVIC_config(void){NVIC_InitTypeDef NVIC_InitStructure; /* NVIC configuration *//* Configure the Priority Group to 2 bits */NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); /* Enable the USARTx Interrupt */NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } 判断帧有无接收完全u8 IsUART1FrameReady(){u8 ucSum = 0; u8 Txbuf[1]; if(RecComplete == 0) { return 0; } else { RecComplete = 0; ucSum ^= Uartpkt.ucPortType;ucSum ^= Uartpkt.ucOprType;ucSum ^= Uartpkt.ucOprDUT;ucSum ^= Uartpkt.ucOprChannel;ucSum ^= Uartpkt.ucOprControl;ucSum ^= Uartpkt.ucOprDataLen;ucSum ^= Uartpkt.ucDataBuffer[0]；if(Uartpkt.ucXorValue == ucSum){ Txbuf[0] = 0x50; //校验正确返回50 UART1_SendData(Txbuf,sizeof(Txbuf)); return 1;}else{ return 0;} }} 串口中断函数void USART1_IRQHandler(void){u8 ReceiveChar; u8 buf[1]; /* 接收 */ if (USART_GetITStatus(USART1, USART_IT_RXNE) == SET) //收到字符 { ReceiveChar = USART_ReceiveData(USART1); if(ReceiveChar == PKT_HEAD){ RxIndex = 0; buf[0] = 0xaa; //收到帧头返回AA UART1_SendData(buf,1);}else if(RxIndex < 7) //{ *((u8*)&Uartpkt + RxIndex) = ReceiveChar; RxIndex++; }else if((RxIndex-7) < Uartpkt.ucOprDataLen) { Uartpkt.ucDataBuffer[RxIndex-7] = ReceiveChar; RxIndex++;}else{ //USART_ClearFlag(USART1,USART_FLAG_RXNE); RecComplete = 1; //} } /* 发送*/ if (USART_GetITStatus(USART1, USART_IT_TXE) == SET) { if (TxIndex < DataLength) { /* Send Transaction data */ USART_SendData(USART1, TxBuf[TxIndex++]); } else { /* Disable the Tx buffer empty interrupt */ USART_ITConfig(USART1, USART_IT_TXE, DISABLE); TxBufEmpty = 1; // } }} 主函数while (1) { if(IsUART1FrameReady() == 1){ ParsePaket();//分析串口帧}} 目前只能实现用串口助手发55返回AA，如果我在串口助手里发整串帧命令，比如第一个获取selftestresult的命令：55 00 00 00 00 00 00 00 00 也只能返回AA，而返回不了0xffff的状态量串口帧有长有短，比如第一个其实只发55 00就应该有返回的，帧里面余下的字节定义都没用到，而其他的第二以后的命令有的会用到余下的字节定义，现在是用串口助手模拟发整个帧命令无返回，不知道各位大神是否明白我的意思？ 我的代码是否有问题？为啥不到返回值呢？
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