forked from platformio/platformio-core
49 lines
895 B
C
49 lines
895 B
C
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#include <stm32l1xx_gpio.h>
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#include <stm32l1xx_rcc.h>
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#include <misc.h>
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/* timing is not guaranteed :) */
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void simple_delay(uint32_t us)
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{
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/* simple delay loop */
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while (us--) {
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asm volatile ("nop");
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}
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}
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/* system entry point */
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int main(void)
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{
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/* gpio init struct */
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GPIO_InitTypeDef gpio;
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/* reset rcc */
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RCC_DeInit();
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/* enable clock to GPIOB */
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RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
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/* use pin 7 */
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gpio.GPIO_Pin = GPIO_Pin_7;
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/* mode: output */
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gpio.GPIO_Mode = GPIO_Mode_OUT;
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/* output type: push-pull */
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gpio.GPIO_OType = GPIO_OType_PP;
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/* apply configuration */
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GPIO_Init(GPIOB, &gpio);
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/* main program loop */
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for (;;) {
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/* set led on */
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GPIO_SetBits(GPIOB, GPIO_Pin_7);
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/* delay */
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simple_delay(100000);
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/* clear led */
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GPIO_ResetBits(GPIOB, GPIO_Pin_7);
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/* delay */
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simple_delay(100000);
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}
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/* never reached */
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return 0;
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}
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