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Cant execute ISR second time

hello frens,

i written code for UART0, where ISR execute when data received from serial port.

 void received(void) __irq
        {
                 unsigned char i;
                 i = U0RBR;
                 UART0_SendByte(i+1);
        }

but it only execute only one time. please help me to solve this problem.

regards,
pankaj Jain

Parents

0 PANKAJ jain over 15 years ago in reply to edPer Westermark

dear fren,
thanks for reply, i am new be.

sorry for above short message.

i give code where i use LCD + UART0 Programming,LCD program is working fine.

I am using LPC2148. i able to receive data from polling method but when i use interrupt it execute only one time.

Please help me to solve this problem.





#include  <lpc214x.h>

#define  EN_HI() IO0SET = (1<<18)
#define  EN_LO() IO0CLR = (1<<18)
#define  CMD()   IO0CLR = (1<<16)
#define  DATA()  IO0SET = (1<<16)
#define  WRITE() IO0CLR = (1<<17)
#define  READ()  IO0SET = (1<<17)
#define  LCD_PORT IO0PIN
#define  SHIFT_HI        15
#define  SHIFT_LO        19


#define Fosc            12000000
#define Fcclk           (Fosc * 5)
#define Fcco            (Fcclk * 4)
#define Fpclk           (Fcclk / 4) * 1

#define  UART_BPS       9600     //Set Baud Rate here

void Serint(void) __irq;

unsigned char str1[] = " SAPCON Instrumets Pvt. Ltd., Indore";
unsigned char str2[] = " Pankaj Kumar Jain R & D    ";

void DELAY(unsigned char data2)
        {
                unsigned int j;
                for(;data2>0;data2--)
                for(j=0;j<60000;j++);
        }

const unsigned char SEND_STRING[] = "Nex Robotics PVT LTD\nARM7 LPC214x Development Board\nCommunication Test\nSend any character to continue\n";
const unsigned char SEND_STRING1[] = "Test Passed\n";





void  Init_UART0(void)                                  //This function setups UART0
{
   unsigned int Baud16;
   U0LCR = 0x83;                            // DLAB = 1
   Baud16 = (Fpclk / 16) / UART_BPS;
   U0DLM = Baud16 / 256;
   U0DLL = Baud16 % 256;
   U0LCR = 0x03;
}


void  UART0_SendByte(unsigned char data)           //A function to send a byte on UART0
{
   U0THR = data;
   while( (U0LSR&0x40)==0 );
}


void  UART0_SendStr(const unsigned char *str)    //A function to send a string on UART0
{
   while(1)
   {
      if( *str == '\0' ) break;
      UART0_SendByte(*str++);
   }
}


void WRITE_CMD(unsigned char data)
        {
          EN_LO();
          CMD();
          WRITE();
          IO0PIN&=0xFF87FFFF;
          IO0PIN|=(data & 0xF0) << SHIFT_HI;
          EN_HI();
          EN_LO();
          IO0PIN&=0xFF87FFFF;
          IO0PIN|=(data & 0x0F ) << SHIFT_LO;
          EN_HI();
          EN_LO();
          DELAY(1);
        }

void WRITE_DATA(unsigned char data)
        {

          EN_LO();
          DATA();
          WRITE();
          IO0PIN&=0xFF87FFFF;
          IO0PIN|=(data & 0xF0) << SHIFT_HI;
          EN_HI();
          EN_LO();
          IO0PIN&=0xFF87FFFF;
          IO0PIN|=((data & 0x0F)  << SHIFT_LO);
          EN_HI();
          EN_LO();
          DELAY(1);
        }

void Init_LCD(void)
        {
           WRITE_CMD(0x20);
           WRITE_CMD(0x28);
           WRITE_CMD(0x0C);
           WRITE_CMD(0x06);

        }

void INIT_PORT(void)
        {
        PINSEL0 = 0x00000005 ;
        PINSEL1 = 0x00000000 ;
        IO0DIR  = 0x007F0000 ;
        PINSEL2 = 0x00000000 ;
        IO1DIR  = 0x00000000 ;
        }

void LCD_STR(unsigned char *data1)
        {
         while(*data1){ WRITE_DATA(*data1); data1++;}
        }





int main(void)
        {

                 VICIntEnable = 0x40;                           // Enable UART0 Interrupt
                 VICIntSelect = 0x00;                           // Set UART0 is IRQ  all interrupt's are IRQ categary
                 VICVectCntl0 = 0x26;                           // Set SLOT0 for UART Interrupt
                                                                                        // i.e. set highest priority in IRQ
                 VICVectAddr0  = (unsigned int)Serint;//0x1E8;                          // Set interrupt vector

                 U0IER = 0x01;                                          // Enable Transmit interrupt and
                                                                                // Recieve line status interrupts
                INIT_PORT();
                Init_LCD();
                Init_UART0();
            WRITE_CMD(0x01);
                WRITE_CMD(0x80);
                LCD_STR(&str2[0]);
                WRITE_CMD(0xC0);
                LCD_STR(&str1[0]);
                DELAY(20);

                UART0_SendStr("hi dear");

                while(1)
                        {
                                WRITE_CMD(0x18);
                                DELAY(150);
                        }
        }

void Serint(void) __irq
        {
                 unsigned char i;
                 i = U0RBR;
                 UART0_SendStr("\n\n\n");
                 UART0_SendByte(i+1);

        }

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