[ts-7000] interrupts using the VIC

["JD" <>]

Hi all,

I am trying to use ep9302 without running linux, booting out of
redbhoot to my program.

I have written up some code which uses the latest newlib that uses the
reboot services for printf etc, with the latest gcc and binutils
comnpiled for arm-elf. I can print stuff out using printf but am stuck
at using the interrupt controller, so am guessing I am doing something
stupid?

I am trying (at the moment) to just fire off a timer 2 interrupt say
100 times per second which toggles the state of the LED on PE.0.

A simple version of the code is below, where the printfs all work, but
I never seem to get an interrupt (or least the LED never changes state)

Any ideas what I am (not) doing?

- - - - - - - - - - - 
#include <stdio.h>

#define EP93XX_APB_BASE 0x80800000UL

#define GPIO_BASE (EP93XX_APB_BASE|0x00040000UL)
#define GPIO_PEDR                (GPIO_BASE+0x20)
#define GPIO_PEDDR               (GPIO_BASE+0x24)

#define IRQ_TIMER2              5
#define TIMER_BASE              (EP93XX_APB_BASE|0x00010000UL)
#define TIMER2_LOAD             (TIMER_BASE+0x20)
#define TIMER2_VALUE            (TIMER_BASE+0x24)
#define TIMER2_CONTROL          (TIMER_BASE+0x28)
#define TIMER2_CLEAR            (TIMER_BASE+0x2C)

#define EP93XX_AHB_BASE      0x80000000
#define VIC1_BASE (EP93XX_AHB_BASE|0x000b0000)

#define VIC1_INT_SELECT     (VIC1_BASE + 0x0c)    /* 1 = FIQ, 0 = IRQ */
#define VIC1_INT_ENABLE      (VIC1_BASE + 0x10)    /* 1 = enable, 0 =
disable */
#define VIC1_INT_ENABLE_CLEAR (VIC1_BASE + 0x14)
#define VIC1_VECT_ADDR  (VIC1_BASE + 0x30)
#define VIC1_DEF_VECT_ADDR  (VIC1_BASE + 0x34)

#define VIC1_VECT_ADDR0   (VIC1_BASE + 0x100)   /* 0 to 15 */
#define VIC1_VECT_CNTL0   (VIC1_BASE + 0x200)   /* 0 to 15 */



void timer2_int()  __attribute__((interrupt ("IRQ")));

void timer2_int()
{
  /* tell VIC we are starting proecessing of thsi int */
   unsigned int c = *((unsigned int *)(VIC1_VECT_ADDR));

  /* toggle led */
  *((unsigned int *)(GPIO_PEDR)) ^= 1;

  /* tell VIC we have finished */
  *((unsigned int *)(VIC1_VECT_ADDR)) = c;
}


void delay()
{
  unsigned int i;
  for(i=0;i<1000000;i++) { i=i; }
}

int main()
{
  printf("starting\n");

  /* init LED output and direction */
  *((unsigned int *)(GPIO_PEDDR)) = 0xff;
  *((unsigned int *)(GPIO_PEDR)) = 0x00;

  printf("LEDs off\n");

  /* setup the VIC */

  /* disable this int ( using int 0 for timer 2) */
  *((unsigned int *)(VIC1_INT_ENABLE_CLEAR)) = (1<<0);
  /* set address of service routine */
  *((unsigned int *)(VIC1_VECT_ADDR0)) = (unsigned int)timer2_int;
  /* what interrtpt will generate this interrupt (and enableit)*/
  *((unsigned int *)(VIC1_VECT_CNTL0)) = (0x20 | IRQ_TIMER2);
  /* enable it */
  *((unsigned int *)(VIC1_INT_ENABLE)) =(1<<0);


  printf("VIC setup ok\n");

  /* init timer 2 to interrupt 100 x per second */
  *((unsigned int *)(TIMER2_CONTROL)) = 0x48;
  *((unsigned int *)(TIMER2_LOAD)) = (508469/100)-1;
  *((unsigned int *)(TIMER2_CONTROL)) = 0xc8;

  printf("Timer 2 enabled\n");


  while(1)
  {
    delay();
    printf(".");
    fflush(stdout);
  }
}





 
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