From 74db299094a2745f1113b8b8173bce2911350fd5 Mon Sep 17 00:00:00 2001 From: Uwe Hermann Date: Sat, 18 Jul 2009 16:22:45 +0200 Subject: Add examples for LED blinking code, both, manually and using the API. --- example/blink.c | 30 +++++++++++++++++++++++------- 1 file changed, 23 insertions(+), 7 deletions(-) diff --git a/example/blink.c b/example/blink.c index 21ac147..7e83710 100644 --- a/example/blink.c +++ b/example/blink.c @@ -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. */ }; - -- cgit v1.2.3