From 58f7ce498dfe3f6c1312b28c6cb3d7d2604f6732 Mon Sep 17 00:00:00 2001
From: Pavel 'LEdoian' Turinsky <ledoian@matfyz.cz>
Date: Sun, 12 Apr 2020 22:45:39 +0200
Subject: [PATCH] Comment the setup a bit

---
 Makefile | 4 ++++
 main.c   | 8 ++++++++
 2 files changed, 12 insertions(+)

diff --git a/Makefile b/Makefile
index 8c4e287..4def1c0 100644
--- a/Makefile
+++ b/Makefile
@@ -12,3 +12,7 @@ CPU_FLAGS := -mthumb -mcpu=cortex-m3 -msoft-float -mfix-cortex-m3-ldrd
 %.bin: %.elf
 	arm-none-eabi-objcopy -Obinary $*.elf $*.bin
 
+flash: main.bin
+	st-flash write /dev/stlinkv1_4 main.bin 0x08000000
+
+.PHONY: flash
diff --git a/main.c b/main.c
index 83f03a4..00aa67a 100644
--- a/main.c
+++ b/main.c
@@ -18,10 +18,18 @@
 #define STM32F1 1			// Needed for libopencm3
 
 void setup (void) {			// All the blackbox code
+
+	// Set up clock
 	rcc_clock_setup_in_hse_8mhz_out_24mhz();
+
+	// Enable the two GPIOs
 	rcc_periph_clock_enable(RCC_GPIOC);
 	rcc_periph_clock_enable(RCC_GPIOA);
+
+	// GPIO C8 amd C9 are the two LEDs
 	gpio_set_mode(GPIOC, GPIO_MODE_OUTPUT_50_MHZ, GPIO_CNF_OUTPUT_PUSHPULL, GPIO8 | GPIO9);
+
+	// GPIO A0 is the push button
 	gpio_set_mode(GPIOA, GPIO_MODE_INPUT, GPIO_CNF_INPUT_FLOAT, GPIO0);
 }