请教 M051串口的问题

只看该作者 · 2010-11-19 00:44

本帖最后由 zhangyang86 于 2010-11-21 23:56 编辑

运行新唐给的串口例程，有个地方有疑问；
发现 中断不停的发生，发生之后(u32IntStatus & DRVUART_THREINT)一直是为true的，
这是为什么？？？
谁知道，我大致看了一下串口的知识，没发现哪里有这样的说明！
按我的理解，当发送FIFO为空，也就是发送FIFO里面的数据消费之后这个中断发生，为什么会一直中断呢？
有谁能帮助讲解一下？？

/*---------------------------------------------------------------------------------------------------------*/
/*                                                                                                       */
/* Copyright(c) 2009 Nuvoton Technology Corp. All rights reserved.                                        */
/*                                                                                                       */
/*---------------------------------------------------------------------------------------------------------*/
#include <stdio.h>
#include "Driver\DrvUART.h"
#include "Driver\DrvGPIO.h"
#include "Driver\DrvSYS.h"

#define RXBUFSIZE 1024

/*---------------------------------------------------------------------------------------------------------*/
/* Global variables                                                                                     */
/*---------------------------------------------------------------------------------------------------------*/
volatile uint8_t comRbuf[RXBUFSIZE];
volatile uint16_t comRbytes = 0;       /* Available receiving bytes */
volatile uint16_t comRhead    = 0;
volatile uint16_t comRtail    = 0;
volatile int32_t g_bWait    = TRUE;

uint8_t u8SendData[12] ={0};
uint8_t u8RecData[RXBUFSIZE]  ={0};
int32_t w_pointer =0;
volatile int32_t r_pointer = 0;
int32_t IsRS485ISR_TX_PORT = FALSE;
int32_t IsRS485ISR_RX_PORT = FALSE;

/*---------------------------------------------------------------------------------------------------------*/
/* Define functions prototype                                                                            */
/*---------------------------------------------------------------------------------------------------------*/
void UART_INT_HANDLE(uint32_t u32IntStatus);

/*---------------------------------------------------------------------------------------------------------*/
/* UART Callback function                                                                               */
/*---------------------------------------------------------------------------------------------------------*/
void UART_INT_HANDLE(uint32_t u32IntStatus)
{
   uint8_t bInChar[1]={0xFF};

         if(u32IntStatus & DRVUART_RDAINT)
{
      /* Get all the input characters */
      while(UART0->ISR.RDA_IF==1)
      {
         /* Get the character from UART Buffer */
         DrvUART_Read(UART_PORT0,bInChar,1);

         if(bInChar[0] == '0')
         {
            g_bWait = FALSE;
         }
         /* Check if buffer full */
         if(comRbytes < RXBUFSIZE)
         {
            /* Enqueue the character */
            comRbuf[comRtail] = bInChar[0];
            comRtail = (comRtail == (RXBUFSIZE-1)) ? 0 : (comRtail+1);
            comRbytes++;
         }
      }
}
else if(u32IntStatus & DRVUART_THREINT)
{

      uint16_t tmp;
      tmp = comRtail;
      if(comRhead != tmp)
      {
         bInChar[0] = comRbuf[comRhead];
         DrvUART_Write(UART_PORT0,bInChar,1);
         comRhead = (comRhead == (RXBUFSIZE-1)) ? 0 : (comRhead+1);
         comRbytes--;
      }
}

}

/*---------------------------------------------------------------------------------------------------------*/
/*  UART Function Test                                                                                     */
/*---------------------------------------------------------------------------------------------------------*/

void UART_FunctionTest()
{
/* Enable Interrupt and install the call back function */
DrvUART_EnableInt(UART_PORT0, (DRVUART_RLSINT | DRVUART_THREINT | DRVUART_RDAINT),UART_INT_HANDLE);
while(g_bWait);

/* Disable Interrupt */
DrvUART_DisableInt(UART_PORT0,DRVUART_RLSINT | DRVUART_THREINT | DRVUART_RDAINT);
g_bWait =TRUE;

}
/*---------------------------------------------------------------------------------------------------------*/
/* UART Test Sample                                                                                     */
/* Test Item                                                                                              */
/* It sends the received data to HyperTerminal.                                                             */
/*---------------------------------------------------------------------------------------------------------*/

int32_t main()
{
// int8_t item;

STR_UART_T sParam;

/* SYSCLK =>12Mhz*/
UNLOCKREG();
SYSCLK->PWRCON.XTL12M_EN = 1;

   /* Run 48Mhz */
DrvSYS_Open(48000);

   /* Set UART Pin */
DrvGPIO_InitFunction(E_FUNC_UART0);

/* UART Setting */
sParam.u32BaudRate       = 19200;
sParam.u8cDataBits       = DRVUART_DATABITS_8;
sParam.u8cStopBits       = DRVUART_STOPBITS_1;
sParam.u8cParity       = DRVUART_PARITY_NONE;
sParam.u8cRxTriggerLevel= DRVUART_FIFO_1BYTES;

/* Set UART Configuration */
   if(DrvUART_Open(UART_PORT0,&sParam) != E_SUCCESS)
{
      return FALSE;
}

   DrvGPIO_Open(E_PORT3,E_PIN6,E_IO_OUTPUT) ;
            DrvGPIO_ClrBit(E_PORT3,E_PIN6);
   DrvSYS_Delay(500000);
   DrvGPIO_SetBit(E_PORT3,E_PIN6);
   DrvSYS_Delay(500000);

do
{
  DrvSYS_Delay(500000);
   DrvGPIO_SetBit(E_PORT3,E_PIN6);
   DrvSYS_Delay(500000);
            DrvGPIO_ClrBit(E_PORT3,E_PIN6);

   UART_FunctionTest();

}while(g_bWait);

}

}