TI中文支持网TI的工程师们好：
我现在遇到一个棘手的问题，我使用"utils_uart.c"文件里面的函数来配置UART3，配置完成后使用GIO_read函数来读取串口3收到的数据。
我把串口3配置为“中断模式”，使用过程中我才发现GIO_read是阻塞性函数，如果没有收到数据程序就一直卡在GIO_read函数里等待。
我的线程还需要处理别的信息，所以我想把GIO_read适配成非阻塞状态，有数据就接收，没有数据就继续运行后面的程序。
然后，我配置了“ioParams.timeout = 10000;”，把UART3配置成等待10ms没有数据后就放弃本次读取操作。配置完成后的好处是GIO_read不会被没有串口数据被阻塞，我的uart_link可以继续做别的事情。但是，有一个问题，程序运行一段时间就会挂掉。报错信息：“XDC ASSERT – ERROR CALLBACK START”。
我现在苦于无法按照我的需求使用GIO_read，特来请教TI的工程师们如何把GIO_read配置成非阻塞，能够让我的uart_link可以在串口没有数据的时候可以做别的事情。
下面附带我的代码： Private_uart3Init()配置UART3，uartRead3(Int8 *pOption)接受串口数据。
Void Private_uart3Init()
{Uart_ChanParams chanParams;Error_Block eb;GIO_Params ioParams;static char uartName[16]; /* device name MUST be global or static variable */static DEV_Struct uartDevObj;static GIO_Struct uartTxObj;static GIO_Struct uartRxObj;static SyncSem_Struct uartTxSyncSemObj;static SyncSem_Struct uartRxSyncSemObj;static Semaphore_Struct uartTxSemObj;static Semaphore_Struct uartRxSemObj;static IOM_PacketuartTxIomObj[UART_ASYNC_IOM_PACKET_MAX];static IOM_PacketuartRxIomObj[UART_ASYNC_IOM_PACKET_MAX];DEV_ParamsdevParams;Uart_ParamsuartParams;SyncSem_Params syncSemParams;Semaphore_Params semParams;Int32 devId;Error_init(&eb);/** Initialize channel attributes.*/GIO_Params_init(&ioParams);Uart_init();if(Bsp_platformIsTda2xxFamilyBuild()){strcpy(uartName, "/uart2");devId = 2;}else{Vps_printf("NOT TDA2XX!! PLEASE CHECK YOUR HARDWARE!!\n");}uartParams= Uart_PARAMS;uartParams.opMode= UART_OPMODE_POLLED;//UART_OPMODE_POLLED;UART_OPMODE_DMAINTERRUPTUART_OPMODE_INTERRUPTuartParams.hwiNumber= 8u;uartParams.rxThreshold = UART_RXTRIGLVL_8;uartParams.txThreshold = UART_TXTRIGLVL_56;uartParams.baudRate= UART_BAUDRATE_115_2K;uartParams.prcmDevId= 0;/* INVARIANT_CONDITION.UNREACH* MISRAC_2004_Rule_13.7* MISRAC_WAIVER:* Code is currently unreachable.* This is kept to ensure future updates to modes.*/if(uartParams.opMode == UART_OPMODE_POLLED){printf(" SYSTEM: UART: POLLED Mode is Selected \n");}else if(uartParams.opMode == UART_OPMODE_INTERRUPT){printf(" SYSTEM: UART: INTERRUPT Mode is Selected \n");}else{/* MISRA WARNING */}uartParams.enableCache = (Bool)FALSE;/* initialise the edma library and get the EDMA handle */chanParams.hEdma = NULL;/* If cross bar events are being used then make isCrossBarIntEn = TRUE and* choose appropriate interrupt number to be mapped (assign it to* intNumToBeMapped)*/chanParams.crossBarEvtParam.isCrossBarIntEn = (Bool)FALSE;chanParams.crossBarEvtParam.intNumToBeMapped = 0xFFU;ioParams.chanParams = (Ptr)&chanParams;DEV_Params_init(&devParams);devParams.deviceParams = &uartParams;devParams.initFxn = NULL;devParams.devid = devId;
/* MISRA.CAST.CONST
* MISRAC_2004 Rule_11.5
* MISRAC_WAIVER:
* External package errors like bios which are not
* part of VSDK package can't be fixed
*/DEV_construct(&uartDevObj, uartName, (Ptr)&Uart_IOMFXNS, &devParams, &eb);SyncSem_Params_init(&syncSemParams);Semaphore_Params_init(&semParams);semParams.mode = Semaphore_Mode_BINARY;Semaphore_construct(&uartTxSemObj, 0, &semParams);syncSemParams.sem = Semaphore_handle(&uartTxSemObj);SyncSem_construct(&uartTxSyncSemObj, &syncSemParams, &eb);ioParams.sync =SyncSem_Handle_upCast(SyncSem_handle(&uartTxSyncSemObj));if(ioParams.numPackets > UART_ASYNC_IOM_PACKET_MAX){UTILS_assert(ioParams.numPackets <= UART_ASYNC_IOM_PACKET_MAX);}memset(&uartTxIomObj[0], 0, ioParams.numPackets * sizeof (IOM_Packet));ioParams.packets = &uartTxIomObj[0];/* create the required channels(TX/RX) for the UART demo */GIO_construct(&uartTxObj, uartName, (UInt32)GIO_OUTPUT, &ioParams, &eb);SyncSem_Params_init(&syncSemParams);Semaphore_Params_init(&semParams);semParams.mode = Semaphore_Mode_BINARY;Semaphore_construct(&uartRxSemObj, 0, &semParams);syncSemParams.sem = Semaphore_handle(&uartRxSemObj);SyncSem_construct(&uartRxSyncSemObj, &syncSemParams, &eb);ioParams.sync =SyncSem_Handle_upCast(SyncSem_handle(&uartRxSyncSemObj));ioParams.timeout = 10000;memset(&uartRxIomObj[0], 0, ioParams.numPackets * sizeof (IOM_Packet));ioParams.packets = &uartRxIomObj[0];GIO_construct(&uartRxObj, uartName, (UInt32)GIO_INPUT, &ioParams, &eb);uartTxHandle2 = GIO_handle(&uartTxObj);uartRxHandle2 = GIO_handle(&uartRxObj);/* INVARIANT_CONDITION.UNREACH* MISRAC_2004_Rule_13.7* MISRAC_WAIVER:* Code is currently unreachable.* This is kept to ensure future updates by the called function.*/if ((NULL == uartRxHandle2) || (NULL == uartTxHandle2)){printf(" SYSTEM: UART: ERROR: GIO_create(%s) Failed !!!\n", uartName);}else{InitDone3 = (Bool)TRUE;}
}
Void uartRead3(Int8 *pOption)
{Int32nStatus = IOM_COMPLETED;size_t nLen= 1u;nStatus = GIO_read(uartRxHandle2, &uartReadBuffer2, &nLen);if (IOM_COMPLETED != nStatus){printf(" SYSTEM: UART: ERROR: GIO_read failed (status = %d) !!! \n",nStatus);}/* copy only one char */*pOption = (Int8)uartReadBuffer2[nLen - 1U];
}
user6238390：
这个问题对我来说很着急，请TI的工程师们帮我看看是否有办法解决我的问题。谢谢！
Shine：
回复 user6238390:
抱歉，TDAxx汽车芯片不通过e2echina论坛进行支持，可以联系您的TI销售获取技术支持或者到e2e英文论坛咨询。
e2e.ti.com/…/791
