1 files changed, 9 insertions(+), 10 deletions(-)

M src/main.c

@@ 1,28 1,27 @@
 #include <libopencm3/stm32/rcc.h>
 #include <libopencm3/stm32/gpio.h>
 
-void setup(void);
-
-void setup(void) {
-    rcc_periph_clock_enable(RCC_GPIOC);
-
-    gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO13);
-}
-
 int main(void) {
+    // sets the clock to 84Mhz & HSE to 25Mhz (change depending on board)
     rcc_clock_setup_pll(&rcc_hse_25mhz_3v3[RCC_CLOCK_3V3_84MHZ]);
+
+    // enable peripheral clock for GPIO port c
     rcc_periph_clock_enable(RCC_GPIOC);
 
+    // set port c pin 13 to output
     gpio_mode_setup(GPIOC, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO13);
 
-    setup();
-
     while (1) {
+        // toggles the state of pin 13
         gpio_toggle(GPIOC, GPIO13);
+
+        // "delay" by wasting cycles
         for (int i = 0;i < 10000000; i++) {
+            // this means an assembly instruction for "no operation"
             __asm__("nop");
         }
     }
     
+    // we should never reach here, but return 0 anyway
     return 0;
 }