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Add examples for LED blinking code, both, manually and using the API.

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This commit is contained in:
Uwe Hermann 2009-07-18 16:22:45 +02:00
parent 3262983d27
commit 74db299094
1 changed files with 23 additions and 7 deletions
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30
example/blink.c
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@ -24,16 +24,33 @@ int main(void)
{
int i;
/* GPIO setup: Enable GPIOC clock, set GPIO12 to 'output push-pull'. */
/* Enable GPIOC clock. */
RCC_APB2ENR = RCC_IOPCEN;
GPIOC_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << (((12 - 8) * 4) + 2));
GPIOC_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << ((12 - 8) * 4));
/* Set GPIO12 (in GPIO port C) to 'output push-pull'. */
/* Manually: */
// GPIOC_CRH = (GPIO_CNF_OUTPUT_PUSHPULL << (((12 - 8) * 4) + 2));
// GPIOC_CRH |= (GPIO_MODE_OUTPUT_2_MHZ << ((12 - 8) * 4));
/* Using API functions: */
gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_2_MHZ,
GPIO_CNF_OUTPUT_PUSHPULL, GPIO12);
/* Blink the LED (PC12) on the board. */
while (1) {
GPIOC_BSRR = GPIO12; /* LED off */
for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
GPIOC_BRR = GPIO12; /* LED on */
/* Manually: */
// GPIOC_BSRR = GPIO12; /* LED off */
// for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
// GPIOC_BRR = GPIO12; /* LED on */
// for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
/* Using API functions gpio_set()/gpio_clear(): */
// gpio_set(GPIOC, GPIO12); /* LED off */
// for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
// gpio_clear(GPIOC, GPIO12); /* LED on */
// for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
/* Using API function gpio_toggle(): */
gpio_toggle(GPIOC, GPIO12); /* LED on/off */
for (i = 0; i < 80000; i++); /* Wait (needs -O0 CFLAGS). */
}
@ -44,4 +61,3 @@ u32 *vector_table[2] __attribute__ ((section(".vectors"))) = {
(u32 *)0x20000800, /* Use 2 KB stack (0x800 bytes). */
(u32 *)main, /* Use main() as reset vector for now. */
};