src/sdram_test.c


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#include <io.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include "system.h"


#define msleep(msec) usleep(1000*msec);

pio_write (unsigned int data)
{
  IOWR (PIO_0_BASE, 0, data);
}

static void
show (int v)
{
  // int to seven segment lookup: MSB dp g f e d c b a LSB
  const uint8_t lookup[10] =
    { 0x3F, 0x6, 0x5B, 0x4F, 0x66, 0x6D, 0x7D, 0x7, 0x7F, 0x6F };

  uint8_t pio = 0;

  // show negative with DP
  if (v < 0)
    {
      pio |= 0x80;
      v = -v;
    }

  if (v > 9)
    v = 9;

  pio |= lookup[v];

  pio_write (pio);
}


int
main (void)
{
  int i;
  printf ("Working...\n");
  for (;;) {
  for (i=-9;i<10;++i) {
	printf("Showing %d\n",i);
	show(i);
	msleep(1000);
  }
 }
	
}