TI中文支持网各位开发者：
大家好。我最近在BIOS下开发C6748的UART程序，之前没弄过DSP，所以有很多问题不太明白。在TMDLCDK6748的开发板上跑了一个TI提供的例程，例程在biospsp_03_00_01_00\drivers\examples\evm6748\uart，例程的代码如下：
uartSample_main.c
#include <xdc/std.h>
#include <ti/sysbios/BIOS.h>
#include <ti/sysbios/io/GIO.h>
#include <xdc/runtime/log.h>
#include <ti/sysbios/knl/Task.h>
#include <xdc/runtime/Error.h>
#include <xdc/runtime/System.h>
#include <ti/sdo/edma3/drv/edma3_drv.h>
#include <psc/include/Psc.h>
#include <uart/include/Uart.h>
#include <uart/include/UartLocal.h>
#include <platforms/evm6748/Uart_evmInit.h>
/* ========================================================================== */
/* EXTERNAL VARIABLES */
/* ========================================================================== */
/* ========================================================================== */
/* EXTERNAL REFERENCES */
/* ========================================================================== */
Void startUartSample(Void);
EDMA3_DRV_Handle edma3init(unsigned int edma3Id, EDMA3_DRV_Result *);
/* ========================================================================== */
/* MACRO DEFINITIONS */
/* ========================================================================== */
#define UART_NUM_IOP (1u)
/* ========================================================================== */
/* LOCAL FUNCTION PROTOTYPES */
/* ========================================================================== */
static Void uartEdmaInit(Void);
static Void tskHeartBeat(Void);
/* ========================================================================== */
/* GLOBAL VARIABLES */
/* ========================================================================== */
/* Handle to the EDMA driver instance */
EDMA3_DRV_Handle hEdma;
/* UART handle for input stream */
GIO_Handle uartRxHandle;
/* UART handle for output stream */
GIO_Handle uartTxHandle;
Uart_Params uartParams;
/* Global function prototypes */
void user_uart_init(void);
/* ========================================================================== */
/* FUNCTION DEFINITIONS */
/* ========================================================================== */
/**
* \brief Void main(Void)
*
* Main function of the sample application. This function enables
* the uart instance in the power sleep controller and also
* enables the pinmux for the Uart 0 instance.
*
* \param None
* \return None
*/
Void main(Void)
{
System_printf("\r\nUart Sample Main\n");
/* Call the EVM specific initialization function */
configureUart();
BIOS_start();
return;
}
/**
* \brief Entry point for the main task. This creates the required channels
* and calls the required functions for demonstrating the UART
* driver
*
* \param arg1 [IN] unused
* \param arg2 [IN] unused *
* \return None
*/
Void uartSampleTask(UArg arg1, UArg arg2)
{
Uart_ChanParams chanParams;
Error_Block eb;
GIO_Params ioParams;
Error_init(&eb);
/*
* Initialize channel attributes.
*/
GIO_Params_init(&ioParams);
/* initialise the edma library and get the EDMA handle */
uartEdmaInit();
/* update the edma Handle */
chanParams.hEdma = hEdma;
ioParams.chanParams = (Ptr)&chanParams;
/* create the required streams for the UART demo */
uartTxHandle = GIO_create("/uart2", GIO_OUTPUT, &ioParams, &eb);
uartRxHandle = GIO_create("/uart2",GIO_INPUT, &ioParams, &eb);
if ((NULL == uartRxHandle) || (NULL == uartTxHandle))
{
System_printf("\nStream creation failed\n");
}
else
{
/* Run the uart sample application */
startUartSample();
/* Start the Heart Beat Print */
tskHeartBeat();
}
}
/**
* \brief Function to initialize the edma driver and get the handle to the
* edma driver;
*
* \param arg1 [IN] unused
* \param arg2 [IN] unused *
* \return None
*/
static Void uartEdmaInit(Void)
{
EDMA3_DRV_Result edmaResult = 0;
hEdma = edma3init(0, &edmaResult);
if (edmaResult != EDMA3_DRV_SOK)
{
/* Report EDMA Error */
System_printf("\nEDMA driver initialization FAIL\n");
}
else
{
System_printf("\nEDMA driver initialization PASS.\n");
}
}
/*
* UART0 init function called when creating the driver.
*/
void user_uart_init()
{
Uart_init();
uartParams = Uart_PARAMS;
uartParams.opMode = Uart_OpMode_POLLED;
uartParams.baudRate = Uart_BaudRate_115_2K;
uartParams.hwiNumber = 9;
uartParams.rxThreshold = Uart_RxTrigLvl_1;
uartParams.softTxFifoThreshold = 1;
if(Uart_OpMode_POLLED == uartParams.opMode)
{
System_printf("\r\nUart is configured in polled mode");
}
else if (Uart_OpMode_INTERRUPT == uartParams.opMode)
{
System_printf("\r\nUart is configured in interrupt mode");
}
else if (Uart_OpMode_DMAINTERRUPT == uartParams.opMode)
{
System_printf("\r\nUart is configured in dma mode");
}
else
{
System_printf("\r\nError: Unknown mode of operation!!!!!!!!!!");
}
}
/**
* \brief Function to print an log to the console every one second(Approx)
*
* \param None
*
* \return None
*
*/
static Void tskHeartBeat()
{
static Uint32 counter = 0;
while (counter < 0xFFFFFFFF)
{
Task_sleep(1000u);
System_printf("\r\n\r\n!!! PSP HrtBt %l", counter);
counter++;
}
}
/* ========================================================================== */
/* END OF FILE */
/* ========================================================================== */
uartSample_io.c
/*
* uartSample_io.c
*
* This file contains the test / demo code to demonstrate the UART driver
* functionality on SYS/BIOS 6.
*
* Copyright (C) 2009 Texas Instruments Incorporated – http://www.ti.com/
*
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the
* distribution.
*
* Neither the name of Texas Instruments Incorporated nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
/**
* \file uartSample_io.c
*
* \brief This file contains the test / demo code to demonstrate the
* UART driver implemented for SYS/BIOS 6.
*
* (C) Copyright 2009, Texas Instruments, Inc
*
* \author PSG
*
* \version 0.1 created for the OMAPL138 and C6748 platforms.
*
*/
/* ========================================================================== */
/* INCLUDE FILES */
/* ========================================================================== */#include <xdc/std.h>
#include <string.h>
#include <xdc/runtime/Memory.h>
#include <xdc/runtime/Log.h>
#include <xdc/runtime/Error.h>
#include <xdc/runtime/System.h>
#include <xdc/runtime/log.h>
#include <ti/sysbios/knl/task.h>
#include <ti/sysbios/io/GIO.h>
#include <psc/include/Psc.h>
#include <uart/include/Uart.h>
#include <uart/include/UartLocal.h>
#include <platforms/evm6748/Uart_evmInit.h>
/* ========================================================================== */
/* EXTERNAL VARIABLES */
/* ========================================================================== */
/* UART handle for input stream */
extern GIO_Handle uartRxHandle;
/* UART handle for output stream */
extern GIO_Handle uartTxHandle;
/* ========================================================================== */
/* MACRO DEFINITIONS */
/* ========================================================================== */
#define SIZEOF_UART_START_STRING 100
/* ========================================================================== */
/* GLOBAL VARIABLES */
/* ========================================================================== */
/** * \brief Variable to hold the starting message printing string.
*
* \note Buffer alignement is required only when working in DMA Mode.
*/
#pragma DATA_ALIGN(uartTestStringStart, 128);
static char uartTestStringStart[SIZEOF_UART_START_STRING];
/** * \brief Variable to hold the user supplied 1000 bytes
*
* \note Buffer alignement is required only when working in DMA Mode.
*/
#pragma DATA_ALIGN(uartBuffer, 128);
// static char uartBuffer[1000];
static char uartBuffer[10];
/* ========================================================================== */
/* FUNCTION DEFINITIONS */
/* ========================================================================== */
/**
* \brief Function to demonstrate the UART functionality.This function * requests the user to input 1000 bytes and reads the same and * tranmits the same back to the user.
* * \param None
*
* \return None
*
*/
Void startUartSample(Void)
{
size_t len = 0;
char *string = NULL;
Int status = IOM_COMPLETED;
string = "UART Demo Starts: INPUT a file of size 1000 bytes";
/* Copy to start string to Cache aligned buffer */
strcpy(uartTestStringStart,string);
/* calculate the length of data */
len = strlen(uartTestStringStart);
/* Transmit the string */
status = GIO_write(uartTxHandle,&uartTestStringStart,&len);
if (IOM_COMPLETED != status)
{
System_printf("\r\nGIO_write failed. returned : %d", status); }
/* Now the user will input a string of 1000 bytes. Hence submit a read *
* request for 1000 bytes */
len = 1000u;
status = GIO_read(uartRxHandle,&uartBuffer,&len);
if (IOM_COMPLETED != status)
{
System_printf("\r\nGIO_read failed. returned : %d", status); }
/* Echo the input data to User for verification */
len = 1000u;
/* Wait until all submit requests completed */
Task_sleep(1);
status = GIO_write(uartTxHandle,&uartBuffer,&len);
if (IOM_COMPLETED != status)
{
System_printf("\r\nGIO_write failed. returned : %d", status); }
}
在Build成功后，把生成的.out文件下载到开发板上，然后加断点调试，发现执行到红色代码部分时，就卡住了。按照注释说明，应该是让输入一个1000字节的字符串。我想知道这个UART程序应该怎么调试啊？需要在开发板上进行硬件的连接吗？
Tony Tang：
在安装目录下有说明文档，要跟PC连接串口，产在上位机打开串口工具，运行程序后就会有显示/提示了。
