Reorganize examples with STM32 and new frameworks

examples/stm32/stm32-spl-blink/src/main.c

@@ -0,0 +1,49 @@
+#include <stm32l1xx_gpio.h>
+#include <stm32l1xx_rcc.h>
+#include <misc.h>
+
+/* timing is not guaranteed :) */
+void simple_delay(uint32_t us)
+{
+	/* simple delay loop */
+	while (us--) {
+		asm volatile ("nop");
+	}
+}
+
+/* system entry point */
+int main(void)
+{
+	/* gpio init struct */
+	GPIO_InitTypeDef gpio;
+
+	/* reset rcc */
+	RCC_DeInit();
+
+	/* enable clock to GPIOB */
+	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);
+
+	/* use pin 7 */
+	gpio.GPIO_Pin = GPIO_Pin_7;
+	/* mode: output */
+	gpio.GPIO_Mode = GPIO_Mode_OUT;
+	/* output type: push-pull */
+	gpio.GPIO_OType = GPIO_OType_PP;
+	/* apply configuration */
+	GPIO_Init(GPIOB, &gpio);
+
+	/* main program loop */
+	for (;;) {
+		/* set led on */
+		GPIO_SetBits(GPIOB, GPIO_Pin_7);
+		/* delay */
+		simple_delay(100000);
+		/* clear led */
+		GPIO_ResetBits(GPIOB, GPIO_Pin_7);
+		/* delay */
+		simple_delay(100000);
+	}
+
+	/* never reached */
+	return 0;
+}