TI中文支持网Part Number:TMS320F280049
根据图示进行通信时，MCU2的所有SCI相关引脚都有数据信号，但MCU1的SCI-A的TX引脚经常没有数据发送，重新上电几次后MCU1的SCI-A又可以重新通信
每次开机都要连续重新上电几次才能正常根据图示通信，两款芯片均为TMS320F280049芯片
Green Deng：
两块板子的硬件都相同吗？有没有互换一下位置测试一下？或者说，硬件上能确保MCU1能运行正常吗？
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YingJed Ying：
两块板子硬件相同，当我用XDS110调试器，调试MCU2时，MCU2的所有SCI都正常，而MCU1的SCI-A的发送端没有任何数据，其余SCI的数据正常
当我用XDS110调试器调试MCU1时，MCU1的所有SCI都正常，而MCU2的SCI-A的发送端没有任何数据，其余SCI的数据正常
当其中一个不正常时，重复上电又都能正常通信
MCU的代码都是从电脑接收到SCI-A的数据时将数据从SCI-B发送给另一个MCU，另一个MCU在SCI-B接收到数据时将数据从SCI-A发送到电脑
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YingJed Ying：
以下是SCI-A的初始化
void HAL_setupSCI(void) {//// GPIO28 is the SCI Rx pin.//GPIO_setPinConfig(DEVICE_GPIO_CFG_SCIRXDA);GPIO_setDirectionMode(DEVICE_GPIO_PIN_SCIRXDA, GPIO_DIR_MODE_IN);GPIO_setPadConfig(DEVICE_GPIO_PIN_SCIRXDA, GPIO_PIN_TYPE_STD);GPIO_setQualificationMode(DEVICE_GPIO_PIN_SCIRXDA, GPIO_QUAL_ASYNC);//// GPIO29 is the SCI Tx pin.//GPIO_setPinConfig(DEVICE_GPIO_CFG_SCITXDA);GPIO_setDirectionMode(DEVICE_GPIO_PIN_SCITXDA, GPIO_DIR_MODE_OUT);GPIO_setPadConfig(DEVICE_GPIO_PIN_SCITXDA, GPIO_PIN_TYPE_STD);GPIO_setQualificationMode(DEVICE_GPIO_PIN_SCITXDA, GPIO_QUAL_ASYNC);//// Map the ISR to the wake interrupt.//Interrupt_register(INT_SCIA_TX, &sciaTxISR);Interrupt_register(INT_SCIA_RX, &sciaRxISR);//// Initialize SCIA and its FIFO.//SCI_performSoftwareReset(SCIA_BASE);//// 50000000 is the LSPCLK or the Clock used for the SCI Module// 57600 is the Baudrate desired of the SCI module// 1 stop bit,No parity, 8 char bits,//SCI_setConfig(SCIA_BASE, LSPCLK_FREQ_H, 19200,(SCI_CONFIG_WLEN_8 |SCI_CONFIG_STOP_ONE |SCI_CONFIG_PAR_NONE));////No loopback//SCI_disableLoopback(SCIA_BASE);SCI_resetChannels(SCIA_BASE);SCI_resetRxFIFO(SCIA_BASE);SCI_resetTxFIFO(SCIA_BASE);SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_TXFF | SCI_INT_RXFF);SCI_enableFIFO(SCIA_BASE);SCI_enableModule(SCIA_BASE);SCI_performSoftwareReset(SCIA_BASE);//// Set the transmit FIFO level to 0 and the receive FIFO level to 2.// Enable the TXFF and RXFF interrupts.//SCI_setFIFOInterruptLevel(SCIA_BASE, SCI_FIFO_TX0, SCI_FIFO_RX1);SCI_enableInterrupt(SCIA_BASE, SCI_INT_TXFF | SCI_INT_RXFF);//// Clear the SCI interrupts before enabling them.//SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_TXFF | SCI_INT_RXFF);//// Enable the interrupts in the PIE: Group 9 interrupts 1 & 2.//Interrupt_enable(INT_SCIA_RX);Interrupt_enable(INT_SCIA_TX);Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9); }以下是SCI-A的中断服务函数
发送中断：
interrupt void sciaTxISR(void) {//// Disable the TXRDY interrupt.//SCI_disableInterrupt(SCIA_BASE, SCI_INT_TXFF);while (SciTxPointEnd != SciTxPointHead) {SCI_writeCharBlockingFIFO(SCIA_BASE,(uint16_t)SciTxBuf[SciTxPointEnd]);SciTxPointEnd ++ ;if (SciTxPointEnd == TxLen)SciTxPointEnd = 0;}SciTxPointEnd = SciTxPointHead = 0;memset(SciTxBuf,0,TxLen);//// Acknowledge the PIE interrupt.//Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9); }接收中断：
interrupt void sciaRxISR(void) {//// Read characters from the FIFO.////每次中断接收到数据SciRxPointHead就相当于指针在数组上后移一位//如果SciRxPointHead已经指到数组最后一位，那么又重头开始指SciRxBuf[SciRxPointHead] = SCI_readCharBlockingFIFO(SCIA_BASE);SciRxPointHead ++;if (SciRxPointHead == RxLen)SciRxPointHead = 0;//// Clear the SCI RXFF interrupt and acknowledge the PIE interrupt.//SCI_clearInterruptStatus(SCIA_BASE, SCI_INT_RXFF);Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9);}以下是SCI-B的初始化代码
void HAL_setupSCIB(void) {//// GPIO13 is the SCI Rx pin.//GPIO_setPinConfig(DEVICE_GPIO_CFG_SCIRXDB);GPIO_setDirectionMode(DEVICE_GPIO_PIN_SCIRXDB, GPIO_DIR_MODE_IN);GPIO_setPadConfig(DEVICE_GPIO_PIN_SCIRXDB, GPIO_PIN_TYPE_STD);GPIO_setQualificationMode(DEVICE_GPIO_PIN_SCIRXDB, GPIO_QUAL_ASYNC);//// GPIO12 is the SCI Tx pin.//GPIO_setPinConfig(DEVICE_GPIO_CFG_SCITXDB);GPIO_setDirectionMode(DEVICE_GPIO_PIN_SCITXDB, GPIO_DIR_MODE_OUT);GPIO_setPadConfig(DEVICE_GPIO_PIN_SCITXDB, GPIO_PIN_TYPE_STD);GPIO_setQualificationMode(DEVICE_GPIO_PIN_SCITXDB, GPIO_QUAL_ASYNC);//// Map the ISR to the wake interrupt.//Interrupt_register(INT_SCIB_TX, &scibTxISR);Interrupt_register(INT_SCIB_RX, &scibRxISR);//// Initialize SCIB and its FIFO.//SCI_performSoftwareReset(SCIB_BASE);//// 50000000 is the LSPCLK or the Clock used for the SCI Module// 57600 is the Baudrate desired of the SCI module// 1 stop bit,No parity, 8 char bits,//SCI_setConfig(SCIB_BASE, LSPCLK_FREQ_H, 19200,(SCI_CONFIG_WLEN_8 |SCI_CONFIG_STOP_ONE |SCI_CONFIG_PAR_NONE));////No loopback//SCI_disableLoopback(SCIB_BASE);SCI_resetChannels(SCIB_BASE);SCI_resetRxFIFO(SCIB_BASE);SCI_resetTxFIFO(SCIB_BASE);SCI_clearInterruptStatus(SCIB_BASE, SCI_INT_TXFF | SCI_INT_RXFF);SCI_enableFIFO(SCIB_BASE);SCI_enableModule(SCIB_BASE);SCI_performSoftwareReset(SCIB_BASE);//// Set the transmit FIFO level to 0 and the receive FIFO level to 2.// Enable the TXFF and RXFF interrupts.//SCI_setFIFOInterruptLevel(SCIB_BASE, SCI_FIFO_TX0, SCI_FIFO_RX1);SCI_enableInterrupt(SCIB_BASE, SCI_INT_TXFF | SCI_INT_RXFF);//// Clear the SCI interrupts before enabling them.//SCI_clearInterruptStatus(SCIB_BASE, SCI_INT_TXFF | SCI_INT_RXFF);//// Enable the interrupts in the PIE: Group 9 interrupts 3 & 4.//Interrupt_enable(INT_SCIB_RX);Interrupt_enable(INT_SCIB_TX);Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9); }以下是SCI-B的中断服务函数
发送中断：
interrupt void scibTxISR(void) {//// Disable the TXRDY interrupt.//SCI_disableInterrupt(SCIB_BASE, SCI_INT_TXFF);while (ScibTxPointEnd != ScibTxPointHead) {SCI_writeCharBlockingFIFO(SCIB_BASE,(uint16_t)ScibTxBuf[ScibTxPointEnd]);ScibTxPointEnd ++ ;if (ScibTxPointEnd == TxLen)ScibTxPointEnd = 0;}ScibTxPointEnd = ScibTxPointHead = 0;memset(ScibTxBuf,0,TxLen);//// Acknowledge the PIE interrupt.//Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9); }接收中断：
interrupt void scibRxISR(void) {//// Read characters from the FIFO.//////ScibRxBuf[ScibRxPointHead] = SCI_readCharBlockingFIFO(SCIB_BASE);ScibRxPointHead ++;if (ScibRxPointHead == RxLen)ScibRxPointHead = 0;//// Clear the SCI RXFF interrupt and acknowledge the PIE interrupt.//SCI_clearInterruptStatus(SCIB_BASE, SCI_INT_RXFF);Interrupt_clearACKGroup(INTERRUPT_ACK_GROUP9); }循环事件中的测试代码：
void SCI_Receive_Debug(void) {//SCIA的接收while(SciRxPointHead != SciRxPointEnd){//正在接收数据ReceiveCMD[SciDataRxLen] = SciRxBuf[SciRxPointEnd];//记录接收内容SciDataRxLen ++;//记录接收长度SciRxPointEnd ++;if (SciRxPointEnd == RxLen){SciRxPointEnd = 0;}if(SciDataRxLen == RxLen){SciDataRxLen = 0;}}if(ReceiveCMD[0] != 0x00)//无论A接收到什么，都从B重新发出{SendMessageToSCIB(SCIB_BASE,ReceiveCMD);memset(ReceiveCMD,0,RxLen);SciDataRxLen = 0;}//SCIB的接收while(ScibRxPointHead != ScibRxPointEnd){//正在接收数据ReceiveCMDB[SciDataRxLen] = ScibRxBuf[ScibRxPointEnd];//记录接收内容SciDataRxLen ++;//记录接收长度ScibRxPointEnd ++;if (ScibRxPointEnd == RxLen){ScibRxPointEnd = 0;}if(SciDataRxLen == RxLen){SciDataRxLen = 0;}}if(ReceiveCMDB[0] != 0x00)//无论B接收到什么，都从A重新发出{SendMessageToSCI(SCIA_BASE,ReceiveCMDB);memset(ReceiveCMDB,0,RxLen);SciDataRxLen = 0;} }
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Green Deng：
你好，这边看了一下你的程序，应该没有什么问题，“重启能运行”这点也基本说明程序可以运行。但是这个现象确实没有什么根据，我这边建议你在英文E2E论坛上咨询一下这个问题，英文论坛的工程师可能有其他建议可以参考。
e2e.ti.com/…/c2000-microcontrollers-forum
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YingJed Ying：
我去问问吧，先谢谢了
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YingJed Ying：
已经找到问题在哪了，两个芯片通信时IO配置有问题，输出IO应配置为开漏输出，输入IO应配置为内部上拉输入
