[讨论] lpc1700 uart通信中出现的问题，求助

lqm880219 2012-3-26 18:55 楼主

#include"uart.h"

static uint8  UART0_Rec_Buffer[UART0_LEN];
volatile static uint8 UART0_Rec_pWrite = 0;
volatile static uint8 UART0_Rec_pRead = 0;

static uint8  UART0_Send_Buffer[UART0_LEN];
volatile static uint8 UART0_Send_Num = 0;
volatile static uint8 UART0_Send_pRead = 0;
volatile static uint8 UART0_Send_pWrite = 0;

void UART0_Init(void)
{
uint16 temp;
U0LCR |= 0X80;
temp = 11059200/(8*9600);
U0DLL = temp &0xff;
U0DLM = temp >> 8;
U0LCR = 0x1B;    //0001 1011
U0IER = 0x03;
//U0FCR = 0X80       A(本想先置为触发，然后开中断，然后使能uart0，中断进入错误)
NVIC_EnableIRQ(UART0_IRQn);
//U0FCR = 0X80       B（调整到开中断后设置触发，使能UART0，中断进入错误）
//U0FCR |= 0X01;
U0FCR = 0x87;          一次性写入触发和使能中断，正确的进入中断


}

uint8 UART0_Send(uint8* pData,uint8 num)
{
   uint8 i=0;
   if(pData == NULL || num == 0)
      return 0;
   while(UART0_Send_Num0)
   {
        UART0_Send_Buffer[UART0_Send_pWrite++] = *pData++;
   if(UART0_Send_pWrite >= UART0_LEN)
   {
     UART0_Send_pWrite = 0;
   }
   UART0_Send_Num++;
   num--;
   i++;
   }
   if((U0LSR & 0X20)&&UART0_Send_Num>0)
   {
     U0THR = UART0_Send_Buffer[UART0_Send_pRead++];
if(UART0_Send_pRead >= UART0_LEN)
{
UART0_Send_pRead = 0;
}
UART0_Send_Num--;
   }
   return i;
}
uint8 UART0_Read(uint8* pData,uint8 num,uint8 offset)
{
return 0;
}

uint8 UART0_Copy(uint8* pData,uint8 num)
{
uint8 i = 0;
if(pData == NULL || num == 0 || UART0_Rec_pWrite == UART0_Rec_pRead)
   return 0;
for(;num>0;num--)
{
   *pData++ = UART0_Rec_Buffer[UART0_Rec_pRead++];
   if(UART0_Rec_pRead >= UART0_LEN)
   {
      UART0_Rec_pRead = 0;
   }
   i++;
   if(UART0_Rec_pRead == UART0_Rec_pWrite)
      break;
}
return i;
}

void UART0_IRQHandler(void)
{
uint8 list = (U0IIR & 0X0F)>>1;
uint8 i;
switch(list)
{
      case 0x02:
   {
     for(i=0;i<8;i++)
{
   UART0_Rec_Buffer[UART0_Rec_pWrite++] = U0RBR;
   if(UART0_Rec_pWrite >= UART0_LEN)
   {
      UART0_Rec_pWrite = 0;
   }
}

   }break;
   case 0x06:
   {
     while(U0LSR &0X01)
{
   UART0_Rec_Buffer[UART0_Rec_pWrite++] = U0RBR;
   if(UART0_Rec_pWrite >= UART0_LEN)
   {
      UART0_Rec_pWrite = 0;
   }
}

   }break;
   case 0x01:
   {
if(UART0_Send_Num == 0)
      break;
      for(i=0;i<16;i++)
{
   U0THR = UART0_Send_Buffer[UART0_Send_pRead++];
   if(UART0_Send_pRead >= UART0_LEN)
   {
      UART0_Send_pRead = 0;
   }
   UART0_Send_Num--;
   if(UART0_Send_Num == 0)
      break;
}


   }break;
   default:break;
}
}

中断错误的主要现象是进入RDA和CTI错误，无论发送几个字节数据，总是进入RDA中断；
这是为什么啊？哪位高手给指点下，分两次操作UOFCR为何会错误，我也只是在不经意间发现的这个问题