From 5d54be33f95f6ba2a6984cf29898c619e5482db7 Mon Sep 17 00:00:00 2001
From: xengineering <mail2xengineering@protonmail.com>
Date: Sun, 20 Sep 2020 12:06:38 +0200
Subject: Implement gpio_blink

---
 gpio_blink/main.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 47 insertions(+)
 create mode 100644 gpio_blink/main.c

(limited to 'gpio_blink/main.c')

diff --git a/gpio_blink/main.c b/gpio_blink/main.c
new file mode 100644
index 0000000..7a5290f
--- /dev/null
+++ b/gpio_blink/main.c
@@ -0,0 +1,47 @@
+
+
+#include <libopencm3/stm32/rcc.h>
+#include <libopencm3/stm32/gpio.h>
+
+
+#define DELAY 1000000
+
+
+void clock_init(void);
+void gpio_init(void);
+void delay(void);
+
+
+int main(void)
+{
+	clock_init();
+	gpio_init();
+
+	while(1){
+		gpio_toggle(GPIOC, GPIO13);
+		delay();
+	}
+
+	return 0;
+}
+
+
+void clock_init(void)
+{
+	rcc_periph_clock_enable(RCC_GPIOC);  // for PC13 blinking
+}
+
+
+void gpio_init(void)
+{
+	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO13);
+	gpio_set(GPIOC, GPIO13);
+}
+
+
+void delay(void)
+{
+	for (int i = 0; i < DELAY; i++) {
+		__asm__("nop");
+	}
+}
-- 
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