1 files changed, 33 insertions, 0 deletions
diff --git a/src/main.c b/src/main.c
new file mode 100644
index 0000000..e9a7b77
--- /dev/null
+++ b/src/main.c
@@ -0,0 +1,33 @@
+#include <stm32f0xx.h>
+
+// Quick and dirty delay
+static void delay (unsigned int time) {
+    for (unsigned int i = 0; i < time; i++)
+        for (volatile unsigned int j = 0; j < 2000; j++);
+}
+
+int main (void) {
+    // Turn on the GPIOA peripheral
+    RCC->AHBENR |= RCC_AHBENR_GPIOAEN;
+
+    // Put pin in general purpose output mode (B01)
+    GPIOA->MODER |= GPIO_MODER_MODER4_0;
+    // Set the output type to push pull (B0 = default)
+    // GPIOA->OTYPER = ~GPIO_OTYPER_OT_4;
+    // Set the output speed to low (B00 = default)
+    // GPIOA->OSPEEDR &= ~GPIO_OSPEEDER_OSPEEDR4;
+    // Set the pull up/down resistors (B00 = default)
+    // GPIOA->PUPDR &= ~GPIO_PUPDR_PUPDR4;
+
+    while (1) {
+        // Reset the bit for port A4
+        GPIOA->BSRR = GPIO_BSRR_BR_4;
+
+        delay(500);
+
+        // Set the bit for port A4
+        GPIOA->BSRR = GPIO_BSRR_BS_4;
+
+        delay(500);
+    }
+}