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Help with interruptions please.

 
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PIT!
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Help with interruptions please.
PostPosted: Thu Oct 04, 2007 2:55 pm     Reply with quote
Hello,

I guess I posted before, but I can´t find the post sorry! =/

First thing, I use MPLAB 7.61 with CCS 3.184.


I´m using this 2 programs:


Master:

Code:

#include <16F877.h>

#fuses HS,NOWDT,NOPROTECT,NOLVP,NOBROWNOUT
#use delay(clock=20000000)

#use rs232 (baud=9600, xmit=pin_c6, rcv=pin_c7, parity=n, bits=8)

#use i2c(Master, sda=PIN_C4, scl=PIN_C3)

...

void main(void)
{
   int c;

   glcd_gotoxy(1,1,1);
   glcd_putc("Pic:");

      // Write the letter 'B' to the slave board.
      i2c_start();
      i2c_write(0x70);
      i2c_write(0x00);
      i2c_write('B');
      i2c_stop();
      
      i2c_start();
      i2c_write(0x70);
      i2c_write(0x01);
      i2c_write('C');
      i2c_stop();

      i2c_start();
      i2c_write(0x70);
      i2c_write(0x02);
      i2c_write('D');
      i2c_stop();


      // Read from the slave board and display the data.
      i2c_start();
      i2c_write(0x70);
      i2c_write(0x00);
      i2c_start();
      i2c_write(0x71);
      dado_com[0] = i2c_read(0);
      i2c_stop();
           
      posx=1;
      posy=2;
   
      for (i=0; i<8; i++)
      {
         if (bit_test(dado_com[0],7-i)==1)
         {
               glcd_gotoxy(posx,posy,1);
               glcd_putc("1");
         }
         else if (bit_test(dado_com[0],7-i)==0)
         {
               glcd_gotoxy(posx,posy,1);
               glcd_putc("0");
         }
         posx++;
      }
   

      posx=1;
      posy=3;

      i2c_start();
      i2c_write(0x70);
      i2c_write(0x01);
      i2c_start();
      i2c_write(0x71);
      dado_com[1] = i2c_read(0);
      i2c_stop();

      for (i=0; i<8; i++)
      {
         if (bit_test(dado_com[1],7-i)==1)
         {
               glcd_gotoxy(posx,posy,1);
               glcd_putc("1");
         }
         else if (bit_test(dado_com[1],7-i)==0)
         {
               glcd_gotoxy(posx,posy,1);
               glcd_putc("0");
         }
         posx++;
      }
   

      posx=1;
      posy=4;

      i2c_start();
      i2c_write(0x70);
      i2c_write(0x02);
      i2c_start();
      i2c_write(0x71);
      dado_com[2] = i2c_read(0);
      i2c_stop();

      for (i=0; i<8; i++)
      {
         if (bit_test(dado_com[2],7-i)==1)
         {
               glcd_gotoxy(posx,posy,1);
               glcd_putc("1");
         }
         else if (bit_test(dado_com[2],7-i)==0)
         {
               glcd_gotoxy(posx,posy,1);
               glcd_putc("0");
         }
         posx++;
      }


      glcd_gotoxy(1,6,1);
      glcd_putc("Memoria:");

      i2c_start();
      i2c_write(0xA0);
      i2c_write(0x00);
      i2c_start();
      i2c_write(0xA1);
      dado_com[0] = i2c_read(0);
      i2c_stop();
           
      posx=1;
      posy=7;
   
      for (i=0; i<8; i++)
      {
         if (bit_test(dado_com[0],7-i)==1)
         {
               glcd_gotoxy(posx,posy,1);
               glcd_putc("1");
         }
         else if (bit_test(dado_com[0],7-i)==0)
         {
               glcd_gotoxy(posx,posy,1);
               glcd_putc("0");
         }
         posx++;
      }
   

      posx=1;
      posy=8;

      i2c_start();
      i2c_write(0xA0);
      i2c_write(0x01);
      i2c_start();
      i2c_write(0xA1);
      dado_com[1] = i2c_read(0);
      i2c_stop();

      for (i=0; i<8; i++)
      {
         if (bit_test(dado_com[1],7-i)==1)
         {
               glcd_gotoxy(posx,posy,1);
               glcd_putc("1");
         }
         else if (bit_test(dado_com[1],7-i)==0)
         {
               glcd_gotoxy(posx,posy,1);
               glcd_putc("0");
         }
         posx++;
      }
   

      posx=1;
      posy=9;

      i2c_start();
      i2c_write(0xA0);
      i2c_write(0x02);
      i2c_start();
      i2c_write(0xA1);
      dado_com[2] = i2c_read(0);
      i2c_stop();

      for (i=0; i<8; i++)
      {
         if (bit_test(dado_com[2],7-i)==1)
         {
               glcd_gotoxy(posx,posy,1);
               glcd_putc("1");
         }
         else if (bit_test(dado_com[2],7-i)==0)
         {
               glcd_gotoxy(posx,posy,1);
               glcd_putc("0");
         }
         posx++;
      }



Slave:
Code:


#include <16F877.h>
#fuses HS,NOWDT,NOPROTECT,NOLVP
#use delay(clock=20000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7)  // Jumpers: 8 to 11, 7 to 12

#use i2c(SLAVE, SDA=PIN_C4, SCL=PIN_C3, address=0x70)

typedef enum {NOTHING, CONTROL_READ,
              ADDRESS_READ, READ_COMMAND_READ} I2C_STATE;

I2C_STATE fState;
BYTE address, buffer[0x10];

#INT_SSP
void ssp_interupt ()
{
   BYTE incoming;

   if (i2c_poll() == FALSE) {
      if (fState == ADDRESS_READ) {  //i2c_poll() returns false on the
         i2c_write (buffer[address]);//interupt receiving the second
         fState = NOTHING;           //command byte for random read operation
      }
   }
   else {
      output_b(0x55);
      incoming = i2c_read();

      if (fState == NOTHING){
         fState = CONTROL_READ;
      }
      else if (fState == CONTROL_READ) {
         address = incoming;
         fState = ADDRESS_READ;
      }
      else if (fState == ADDRESS_READ) {
         buffer[address] = incoming;
         fState = NOTHING;
      }
   }
}


void main ()
{
   int i;

   fState = NOTHING;
   address = 0x00;
   for (i=0;i<0x10;i++)
      buffer[i] = 0x00;

   enable_interrupts(GLOBAL);
   enable_interrupts(INT_SSP);

   output_b(0xAA);

   while (TRUE) {
   }
}





My problem is that every time I use interruptions, it reloads all the main!

Exemple:

With the output_b(0xAA) my led´s stay green, with the output_b(0x55) they stay red.

So when I get a interrupt, it stays like 1 second red, then goes back to green. It should never go back to green.

I have a 24c08 and the pic on the i2c line. The read memory part works fine, but the pic part gets only 11111111 ( because of the pull-up resistors ).

I hope you understand it!

Thanks
Ttelmah
Guest
PostPosted: Thu Oct 04, 2007 3:06 pm     Reply with quote
There is a problem in your thinking.
Don't use I2C_POLL for this. It says a byte has been received. You need to load the byte to be read back, for your 'read' operation on the master,_when the address has been received, with the low bit set_. I2C_POLL, will still be true at this point. This is why there is I2C_ISR_STATE, which allows you to detect the read/write bit.

Best Wishes
PIT!
Guest
PostPosted: Fri Oct 05, 2007 5:04 am     Reply with quote
But that is the ex_slave.c

Just added the output_b lines, to see where my error was!

And my version of ccs does not have i2c_isr_state.

Here is the notice from the CCS versions page of when it was added:
3.231 New function added: I2C_ISR_STATE()

Mine is CCS 3.184. =/

Thanks
Ttelmah
Guest
PostPosted: Fri Oct 05, 2007 5:13 am     Reply with quote
Do a search on the forum. There has been a replacement I2C_ISR_STATE function published in the past for use in the older compilers. I'm afraid I don't think CCS, actually tried what they posted, and when they did, they realised that they needed to check the R/W bit, and added I2C_ISR_STATE....

Best Wishes
PIT!
Guest
PostPosted: Fri Oct 05, 2007 5:16 am     Reply with quote
Yeh i found it, thanks.

But i don´t think the problem is the actual function, is the fact that is reload the main.

Because every interruption i make, it reloads the constants of the initialize program. So it is impossible to work with any program.

Thanks.
Ttelmah
Guest
PostPosted: Fri Oct 05, 2007 6:57 am     Reply with quote
The only thing wrong with the master main, is that it'll drop off the end (need something to stop this...). However this won't cause a restart (since WDT is disabled).
There are some 'nasties' in the slave (for instance, what happens if the master accidentally sends bore than 0x10 bytes?....

Best Wishes
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