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???
10/01/09 04:47
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 		 #169319 - This was the Exact Problem
Responding to: ???'s previous message
Maarten Brock said:

You already found out that the interrupt vector for timer 2 is not at the same place as for an intel 8052. Yet you still include < 8052.h >. Who knows what else they moved around. (Well, since I looked, I know. ET2 is at 0xE8 instead of 0xAD.)
I think you'd better include < p89v66x.h >. It contains the correct sfr and sbit definitions.
Maarten


The program works now! I have hard coded the sfr and sbit definitions and the interrupt is generated. Here is the updated code:


Save test_capture.c
#include <8051.h>

#define WAIT    1
#define READY   0
#define CLEAR   0
#define SET     1

volatile bit ovf = 0;   /* record the overflow */
volatile bit bit_status = READY;

void isr_byte_recv(void) __interrupt 7;


__sfr __at (0xC9) T2MOD;
__sfr __at (0xC8) T2CON;
__sfr __at (0xCA) RCAP2L;
__sfr __at (0xCB) RCAP2H;

/* T2CON register bits */
__sbit __at (0xC8) CP;
__sbit __at (0xC9) CT2;
__sbit __at (0xCA) TR2;
__sbit __at (0xCB) EXEN2;
__sbit __at (0xCE) EXF2;
__sbit __at (0xCF) TF2;

__sbit __at (0xE8) ET2;

main()
{
        T2CON |= 0x01;
        EXEN2 = 1;
        EA = 1;
        ET2 = 1;
        TR2 = 1;
        while (1) {
                /* my application code here */
        }
}


void isr_byte_recv(void) __interrupt 7
{
        if (TF2 == 1) {         /* check overflow */
                P1_5 = !P1_5;   /* LED2 */
                TF2 = 0;
        }
        if (EXF2 == 1) {
                P3_4 = !P3_4;   /* buzzer */
                EXF2 = 0;
        }
}

 


Thank you all for your suggestions. This is a new lesson.

cheers,
Sarma


List of 13 messages in thread
TopicAuthorDate
Timer 2 Interrupt Enable?            01/01/70 00:00      
   do you actually clock the T2EX?            01/01/70 00:00      
      Yes I am            01/01/70 00:00      
   prototype visible to main            01/01/70 00:00      
      Some Differences Found in Documentation            01/01/70 00:00      
         who know the most about NXP chips ?            01/01/70 00:00      
            Can't Get Your Point            01/01/70 00:00      
               YES            01/01/70 00:00      
   One Problem Fixed            01/01/70 00:00      
      wrong include            01/01/70 00:00      
         This was the Exact Problem            01/01/70 00:00      
            re include files            01/01/70 00:00      
   Please check .RST file            01/01/70 00:00      

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