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/*
* Small test program to check GPIOs
*
* LED chaser until keypress
*
*/
// addresses refer to Phi memory layout
#define GPIO_DATA *((volatile unsigned int *) 0x080a0004)
#define GPIO_DIR *((volatile unsigned int *) 0x080a0008)
#define BUTTON_EAST (3)
#define BUTTON_NORTH (2)
#define BUTTON_SOUTH (1)
#define BUTTON_WEST (0)
#define bit_is_set(var, bit) ((var) & (1 << (bit)))
#define bit_is_clear(var, bit) ((!(var)) & (1 << (bit)))
#define loop_until_bit_is_set(var, bit) do { } while (bit_is_clear(var, bit))
#define loop_until_bit_is_clear(var, bit) do { } while (bit_is_set(var, bit))
void led_test( void)
{
unsigned char runs;
unsigned char leds;
runs = 1;
leds = 0x01;
while( runs)
{
// output
GPIO_DATA = leds;
// read button status
if bit_is_set(GPIO_DATA, BUTTON_NORTH)
{
runs = 0;
}
// LED chaser
leds = leds << 1;
if (leds == 0)
{
leds = 0x01;
}
}
}
void header_test( void)
{
// this test is special for the SP601 header connector
// check the output in simulation
GPIO_DATA = 0x00550000;
GPIO_DIR = 0xff00ffff;
GPIO_DATA = 0x00aa0000;
GPIO_DIR = 0xffffffff;
}
int main(int argc, char **argv)
{
led_test();
header_test();
abort();
}
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