IWR6843AOP: iwr6843aop 使用串口UART-B，初始化后，使用UART_read接口，其运行情况跟初始化配置的不对应

houguo chen

Part Number: IWR6843AOP

串口配置如下，

int32_t UartInit(void)

{

int32_t errCode;

UART_Params uartParams;

DMA_Params dmaParams;

DMA_Handle dmaHandle;

gUartLastError = UART_ERROR;

/* Initialize the UART */

UART_init();

/* Initialize the DMA for UART */

DMA_init();

/* Open the DMA Instance */

DMA_Params_init(&dmaParams);

dmaHandle = DMA_open(0, &dmaParams, &errCode);

if (dmaHandle == NULL)

{

printf("Error: Unable to open the DMA Instance [Error code %d]\n", errCode);

return gUartLastError;

}

/* Platform specific configuration */

UartPlatformInit(&gMmwMssMCB.cfg.platformCfg);

/* Setup the default UART Parameters */

UART_Params_init(&uartParams);

uartParams.writeDataMode = UART_DATA_BINARY;

uartParams.readDataMode = UART_DATA_BINARY;

uartParams.clockFrequency = MSS_SYS_VCLK;

uartParams.baudRate = 921600;

uartParams.isPinMuxDone = 1U;

uartParams.dmaHandle = dmaHandle;

uartParams.txDMAChannel = UART_DMA_TX_CHANNEL;

uartParams.rxDMAChannel = UART_DMA_RX_CHANNEL;

uartParams.readEcho = UART_ECHO_OFF;

uartParams.readReturnMode = UART_RETURN_FULL;

/* Open the Logging UART Instance: */

gMmwMssMCB.loggingUartHandle = UART_open(1, &uartParams);

if (gMmwMssMCB.loggingUartHandle == NULL)

{

System_printf("Error: Unable to open the Logging UART Instance\n");

Pcount3DDemo_debugAssert(0);

return gUartLastError;

}

gUartLastError = UART_OK;

return gUartLastError;

}

在使用UART_read接口：

static void UartRead_Task(UArg arg0, UArg arg1)

{

uint8_t rx;

CLI_write ("[%s]\n", __FUNCTION__);

while(1)

{

int32_t ret = UART_read(gMmwMssMCB.loggingUartHandle, (uint8_t *)&rx, 1U);

if(ret > 0)

CLI_write ("UART_read(%d):%u\n", ret, rx);

}

问题点：

1）该 UART_read接口未处于等待接收数据状态，而是一直重复被调用，按照配置是一直等待数据的。

2）另外该task中如果加入Task_sleep()就会系统崩溃，不知啥原因。

但将UART-B换为UART-A，初始化UART-A,则该接口正常.

UART-B的接收处理是怎么做的才正常呢？

1 年多前

0 Shine 1 年多前

TI__Guru**** 357097 points

请问是自己的板子吗？UARTA和UARTB硬件上接法一样吗？uart TX, RX管脚上的时序正确么？

0 houguo chen 1 年多前回复 Shine

1）自己的硬件板子，用的是6843。

2）UARTA和UARTB硬件上接法一样，因为软件上的配置pinmux将他们都可以绑定到相同的引脚出来。

3）管脚时序看不出，我软件上的配置就是Uart_open时换了一个口，一个是0一个是1，然后UART_read就会有区别，个人感觉应该是驱动层面上的原因。

4）在ti众多的工程中没看到用UARTB的接收实现例子，只有用它的发送接口。

请问：

1）有用过这个UARTB的接收实现参考没？
2）接收处理这块你们能否测试一下，就是Uart_open时把0换为1（uartA换为uartB），然后pinmux时，引脚绑定改到对应串口，然后观察现象如何？

0 Chris Meng 1 年多前回复 houguo chen

TI__Guru*** 144693 points

你好，

你是否有修改下面标黄部分代码为UartSci_Duplexity_FULL？

mmwave_sdk_03_05_00_04\packages\ti\drivers\uart\platform\uart_xwr68xx.c

/**
* @brief This is the XWR18xx MSS specific UART configuration. There are
* 2 UART instances available on the MSS. UART1 is tied to SCI-A and UART3 is
* tied to SCI-B. This should *NOT* be modified by the customer.
*/
UartSci_HwCfg gUartSciHwCfg[2] =
{
/* UART1 Hardware configuration:
* - Capable of sending and receiving data
* - PIN MUX is required */
{
((volatile SCIRegs*)SOC_XWR18XX_MSS_SCI_A_BASE_ADDRESS),
UartSci_Duplexity_FULL,
UartSci_PinMux_REQUIRED,
SOC_XWR18XX_MSS_SCIA_LVL0_INT,
SOC_XWR18XX_MSS_SCIA_TX_DMA_REQ,
SOC_XWR18XX_MSS_SCIA_RX_DMA_REQ,
&UartSci_openDMA,
&UartSci_closeDMA,
&UartSci_isDMAEnabled,
&UartSci_initiateRxDMA,
&UartSci_initiateTxDMA
},

/* UART3 Hardware configuration:
* - Capable of only sending data
* - PIN MUX is required */
{
((volatile SCIRegs*)SOC_XWR18XX_MSS_SCI_B_BASE_ADDRESS),
UartSci_Duplexity_TX_ONLY,
UartSci_PinMux_REQUIRED,
SOC_XWR18XX_MSS_SCIB_LVL0_INT,
SOC_XWR18XX_MSS_SCIB_TX_DMA_REQ,
SOC_XWR18XX_MSS_SCIB_RX_DMA_REQ,
&UartSci_openDMA,
&UartSci_closeDMA,
&UartSci_isDMAEnabled,
&UartSci_initiateRxDMA,
&UartSci_initiateTxDMA
}
};

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IWR6843AOP: iwr6843aop 使用串口UART-B，初始化后，使用UART_read接口，其运行情况跟初始化配置的不对应