Serial ISR for ADUC842

Hello sir,

I need to write an ISR for serial interrupt.

void serial_int (void) interrupt 4 //ISR for Serial interrupt

{

if((IE & BIT4) == BIT4) //UART interrupt source

REN = 1; // enables serial port reception { while(RI == 0) {} RI = 0; ucRxChar1 = SBUF;
} this is how i have written the ISR...
I am unable to run my program...
it is giving error...
is der any other way to write ISR?

REGARDS
MAYURI

 RE: Serial ISR for ADUC842

Do you really think an interrrupt handler should have a busy-loop where it waits for the hardware to be ready for something? Isn't the intention with an interrupt handler that the processor interrupts the normal program execution when the hardware gets ready for something?

What hapens if you have an ISR that gets stuck in an infinite loop? Will the main program ever run then?

By the way - did you seriously dislike the look of your post with the code posted using the proper tags as described directly above the message input box? What made you think using the tags was a bad idea best avoided?

 RE: Serial ISR for ADUC842

if((IE & BIT4) == BIT4) //UART interrupt source
do you really think the interrupt will fire if it is not enabled?

did you seriously dislike the look of your post with the code posted using the proper tags as described directly above the message input box? What made you think using the tags was a bad idea best avoided?
easy - requirs reading instructions

Erik

 RE: Serial ISR for ADUC842

i have enabled all interrupts.

Am i suppose to include any registry/look up table or something?

Am i missing out something?

Regards
Mayuri

 RE: Am i missing out something?

Basic study of the 8051 architecture, and how to use it?

The 8051 has been around for years - there are plenty of examples, tutorials, etc; eg,

http://www.keil.com/books/8051books.asp
http://www.keil.com/download/list/c51.htm

http://www.8052.com/tutorial
http://www.8052.com/faqs/120112

 RE: Serial ISR for ADUC842

#include<8051.h>
unsigned char str;

void init_serial()        // Initialize serial port
{
        TMOD=0x20;        // Mode=2
        TH1=0xfd;         // 9600 baud
        SCON=0x50;        // Serial mode=1 ,8-Bit data,1 Stop bit ,1 Start bit  , Receiving on
        TR1=1;            // Start timer
}

void transmit_data(unsigned char str)           // Function to transmit data through serial port
{
        SBUF=str;                               // Store data in sbuf
        while(TI==0);                           // Wait till data transmit
        TI=0;
}

void receive_data()  interrupt 4         // Function to recieve data serialy from RS232 into microcontroller
 {
         str=SBUF;                       // Read sbuf
         RI=0;
         transmit_data(str);             // Transmit to HyperTerminal
 }

void main()
{
        init_serial();           // Initialize serial port
        IE=0x90;
        while(1);
}

Try this to check the interrupt..

 that would require

Try this to check the interrupt..
that would require that someone had an ICE for the ADUC842, or, at least, an ADUC842. '51 derivatives are NOT identical re I/O

I do not know the ADUC but does it have separate UART interrupts for recieve and transmit? code assumes so

Erik