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using interrupt spi1 with button.c

 
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salgulsen



Joined: 16 Sep 2009
Posts: 21

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using interrupt spi1 with button.c
PostPosted: Sat Feb 13, 2010 9:55 am     Reply with quote
Hi,

I'm trying to use button command that is in code library with the int_spi1 of dspic30f4013. But it doesnt work quite correctly. Here is my code :
Code:

#include <30F4013.h>
#FUSES NOWDT, HS, PR, NOCKSFSM, WPSB16, WPSA512, PUT64, NOBROWNOUT, BORV47, LPOL_HIGH, HPOL_HIGH, NOPWMPIN, MCLR, NOPROTECT, NOWRT, NODEBUG, NOCOE, ICSP1, RESERVED
#use delay(clock=20000000)
#include <button.c>

#byte SPI1BUF = 0x224  // Register address for dspic30f4013

int8 resp=0,B0,B1,B2,B3,sendit=0x00,counter;

#int_spi1
void spi1_isr(void)
{
int8 command;
command = SPI1BUF;

switch (command){
   case 0xFF:  SPI1BUF = 0;
               break;
   case 0xFE:  SPI1BUF = sendit;
               break;
   case 0xFD:  resp++;
               SPI1BUF = resp;
               break;
}

}

void main()
{
   int1 menubut,upbut,downbut,selbut,startbut,stopbut,bolusbut;
   int8 cnt,anl81=0,anl82;
   int16 anl16=0;
   //int16 TRISDE;
   
   setup_spi(spi_slave | spi_L_to_H);
   clear_interrupt(INT_SPI1);
   enable_interrupts(INT_SPI1);
   setup_wdt(WDT_OFF);
   setup_timer1(TMR_DISABLED|TMR_DIV_BY_1);
   //TRISDE = GET_TRIS_D();
   //TRISDE = TRISDE && 65279;
   //Set_TRIS_D(TRISDE);
   
   while(1)
   { 
      //menubut = input(pin_b0);
      //upbut = input(pin_b1);
      //downbut = input(pin_b3);
      //selbut = input(pin_b4);
      menubut = button(pin_b0,0,100,50,B0,1);
      upbut = button(pin_b1,0,100,50,B1,1);
      downbut = button(pin_b3,0,100,50,B2,1);
      selbut = button(pin_b4,0,100,50,B3,1);
     
      if(menubut){
            bit_set(sendit,0);
         }else{
            bit_clear(sendit,0);
         }
         
         if(upbut){
            bit_set(sendit,1);
         }else{
            bit_clear(sendit,1);
         }
         
         if(downbut){
            bit_set(sendit,2);
         }else{
            bit_clear(sendit,2);
         }
         
         if(selbut){
            bit_set(sendit,3);
         }else{
            bit_clear(sendit,3);
         }
         
         delay_ms(10);
   }
}


By the way if I use input(pin) command that are slashed out in code instead of the button commands, it works. I just want to suppress the buttons while I'm using the interrupts.
Thanks in advance.
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Sat Feb 13, 2010 12:25 pm     Reply with quote
The button.c code was written and tested only with the PCM and PCH
compilers (for 16F and 18F PICs). Also, it was written back in version 3
of the compiler (at about vs 3.229). With that version, the input()
function would not take a variable for the PIN number. It required a
constant. So I wrote a macro that would accept a variable pin number.
(Note: Vs. 4 of the compiler allows variables for the input() function).

If you look at the button.c code, you'll see this macro:
Code:
#define read_bit_var(x)  bit_test(*(int8 *)(x >> 3), x & 7)

This macro probably doesn't work with the PCD compiler. I don't have
that compiler, so I don't know for sure. But there I believe there is a
work-around. Edit the button.c file. Comment out the call to the
read_bit_var() function, and add a call to the input() function, as shown
below. See if that fixes the problem with PCD.
Code:

int8 button(int16 pin, int8 downstate, int8 delay,
            int8 rate, int8 &BVar, int8 action)
{
int8 pin_value;

// Read the button pin.
//pin_value = read_bit_var(pin);  // *** Comment out this line

pin_value = input(pin);  // *** Add this line
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