c++ to c for stm32 firmware

1 files changed, 21 insertions, 0 deletions

diff --git a/stm32f091/main.c b/stm32f091/main.c
new file mode 100644
index 0000000..180240e
--- /dev/null
+++ b/stm32f091/main.c
@@ -0,0 +1,21 @@
+#include <stm32f0xx.h>
+#include <stdint.h>
+
+#define PORT GPIOA
+#define PIN 5
+
+int main() {
+	RCC->AHBENR |= RCC_AHBENR_GPIOAEN | RCC_AHBENR_GPIOBEN;
+
+	PORT->MODER &= ~(0b11 << (PIN * 2));
+	PORT->MODER |= (0b01 << (PIN * 2));
+
+	uint8_t led = 1;
+
+	while (1) {
+		PORT->ODR &= ~(1 << PIN);
+		PORT->ODR |= (led << PIN);
+		led ^= 1;
+		for (unsigned long i = 0; i < 50000; i++) asm("nop");
+	}
+}