您好：

        目前我在使用CC1310的SPI   Master模式，需求是SPI MASTER模式下可以一次发送256个字节， 按照API中的例程，可以正常发送Hello World，但是将需要发送的数组赋值为100个字节运行后，发现只能打出前28个字节。

     按照API说明：SPI的TX每次最多可以发送1024个字节：

        Transfer Size Limit

       The UDMA controller only supports data transfers of up to 1024 data frames. A transfer with more than 1024 frames will be transmitted/received in multiple 1024 sized portions until all data has been transmitted/received. A data frame can be 4 to 16 bits in length.

   目前有怀疑是不是超时时间没有设置好？？  

Timeout

Timeout can occur in SPI_MODE_BLOCKING, there's no timeout in SPI_MODE_CALLBACK. When in SPI_MODE_CALLBACK, the transfer must be cancelled by calling SPI_transferCancel().
If a timeout happens in either SPI_SLAVE or SPI_MASTER mode, the receive buffer will contain the bytes received up until the timeout occurred. The SPI transaction status will be set to SPI_TRANSFER_FAILED. The SPI transaction count will be set to the number of bytes sent/received before timeout. The remaining bytes will be flushed from the TX FIFO so that the subsequent transfer can be executed correctly. Note that specifying a timeout prevents the driver from performing a polling transfer when in slave mode.

代码如下：

void *mainThread(void *arg0)
{GPIO_init();SPI_init();uint8_t x;SPI_Handle handle;SPI_Params params;SPI_Transaction transaction;uint8_t txBufdata[100];uint8_t rxBuf[11];SPI_Params_init(&params);params.bitRate= 4000000;params.frameFormat = SPI_POL1_PHA1;params.mode= SPI_MASTER;transaction.count = sizeof(txBufdata);transaction.txBuf = txBufdata;transaction.rxBuf = rxBuf;handle = SPI_open(Board_SPI_MASTER, &params);while(1){for(x=0;x<100;x++){txBufdata[x]=x;}SPI_transfer(handle, &transaction);}
}

       麻烦您看下或者提供下可用例程，谢谢！

Katherine Wang：

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,

Katherine Wang：

您是说想发送 256 字节，但 tx 缓冲区是 100 字节？

我测试了以下内容，发送 256 字节没有任何问题：

#define THREADSTACKSIZE (2048)
#define SPI_MSG_LENGTH(256)unsigned char masterTxBuffer[SPI_MSG_LENGTH];void *masterThread(void *arg0)
{SPI_HandlemasterSpi;SPI_ParamsspiParams;SPI_Transaction transaction;uint16_ti;SPI_Params_init(&spiParams);spiParams.frameFormat = SPI_POL0_PHA1;spiParams.bitRate = 4000000;masterSpi = SPI_open(Board_SPI_MASTER, &spiParams);for(i = 0; i <= 255; i++){masterTxBuffer[i] = i;}transaction.count = SPI_MSG_LENGTH;transaction.txBuf = (void *) masterTxBuffer;transaction.rxBuf = NULL;SPI_transfer(masterSpi, &transaction);while(1);
}