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lpc111x-isp/test/: proof of concept LED-blinking code

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This commit is contained in:
Werner Almesberger
2012-12-31 03:19:59 -03:00
parent c7a7d358bb
commit 49ff81fa70
3 changed files with 140 additions and 0 deletions
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69
lpc111x-isp/test/test.c Normal file
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/*
* Test code for the Tornado CPU board
*/
#include <stddef.h>
#include <stdint.h>
extern uint32_t _data_flash;
extern uint32_t _data_begin;
extern uint32_t _data_end;
extern uint32_t _bss_end;
extern uint32_t _stack_end;
extern uint32_t _neg_stack_end;
#define IOCONFIG 0x40044000
#define GPIO_BASE_0 0x50000000
#define GPIO0DATA (GPIO_BASE_0+0x3ffc)
#define GPIO0DIR (GPIO_BASE_0+0x8000)
/* LED is on PIO0_5 */
int main(int argc, char **argv)
{
volatile uint32_t *data = (void *) GPIO0DATA;
volatile uint32_t *dir = (void *) GPIO0DIR;
uint32_t mask = 0;
uint32_t loop;
*dir = 1 << 5;
while (1) {
*data = mask;
mask ^= 1 << 5;
for (loop = 100000; loop; loop--);
}
}
void __attribute__((naked, section(".init"))) __init(void)
{
register uint32_t *t = &_data_begin;
register uint32_t *s = &_data_flash;
while (t != &_data_end)
*t++ = *s++;
while (t != &_bss_end)
*t++ = 0;
main(0, NULL);
}
#define INITIAL_SP ((uint32_t) &_stack_end)
#define NEG_INITIAL_SP ((uint32_t) &_neg_stack_end)
#define VECTORS 8
uint32_t __vectors[VECTORS] __attribute__((section(".vectors"))) = {
INITIAL_SP, /* initial SP value @@@ */
VECTORS*4+1, /* reset */
0, /* NMI */
0, /* HardFault */
0, /* reserved */
0, /* reserved */
0, /* reserved */
NEG_INITIAL_SP-(VECTORS*4+1),/* checksum */
};