From db0e59da962e53ba84b961a1b3d5e6a3badb2726 Mon Sep 17 00:00:00 2001 From: Uwe Hermann Date: Mon, 20 Jul 2009 15:35:12 +0200 Subject: Rename example subdir to examples, we'll have more than one. --- examples/blink.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 62 insertions(+) create mode 100644 examples/blink.c (limited to 'examples/blink.c') diff --git a/examples/blink.c b/examples/blink.c new file mode 100644 index 0000000..7c7da78 --- /dev/null +++ b/examples/blink.c @@ -0,0 +1,62 @@ +/* + * This file is part of the libopenstm32 project. + * + * Copyright (C) 2009 Uwe Hermann + * + * This program is free software: you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation, either version 3 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program. If not, see . + */ + +#include + +int main(void) +{ + int i; + + /* Enable GPIOC clock. */ + RCC_APB2ENR = IOPCEN; + + /* 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) { + /* 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). */ + } + + return 0; +} + +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