From 5b2703bda216bafd6b4391f0d613fcf867cb64c0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?King=20K=C3=A9vin?= <kingkevin@cuvoodoo.info>
Date: Sun, 2 Apr 2017 13:47:52 +0200
Subject: [PATCH] fix doc

---
 lib/i2c_master.c  | 2 +-
 lib/led_max7219.c | 1 +
 main.c            | 4 +++-
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/lib/i2c_master.c b/lib/i2c_master.c
index abe8ec7..718bdfd 100644
--- a/lib/i2c_master.c
+++ b/lib/i2c_master.c
@@ -39,7 +39,7 @@
 #define I2C_MASTER_I2C 2 /**< I2C peripheral */
 /** @} */
 
-/** @defgroup i2c_timer timer peripheral used for timeouts
+/** @defgroup i2c_master_timer timer peripheral used for timeouts
  *  @{
  */
 #define I2C_MASTER_TIMER 4 /**< timer peripheral */
diff --git a/lib/led_max7219.c b/lib/led_max7219.c
index b594580..44f378f 100644
--- a/lib/led_max7219.c
+++ b/lib/led_max7219.c
@@ -161,6 +161,7 @@ uint8_t lex_max7219_displays = 0;
 
 /** write data on SPI bus and handle load signal
  *  @param[in] data bytes to write
+ *  @param[in] display display number in chain (0xff for all)
  */
 static void led_max7219_write(uint16_t data, uint8_t display)
 {
diff --git a/main.c b/main.c
index 1de147e..959ac45 100644
--- a/main.c
+++ b/main.c
@@ -56,7 +56,7 @@ volatile bool frame_flag = false; /**< flag set when a frame has passed */
 
 #define SQUARE_WAVE_PORT B /**< port connected to RTC DS1307 square wave output */
 #define SQUARE_WAVE_PIN 0 /**< pin connected to RTC DS1307 square wave output */
-volatile uint8_t rtc_seconds = 0; /** number of seconds passed incremented by the square wave */
+volatile uint8_t rtc_seconds = 0; /**< number of seconds passed incremented by the square wave */
 
 #define FRAME_TIMER 1 /**< timer to count frame time */
 #define FRAME_RATE 25 /**< frame rate */
@@ -378,6 +378,7 @@ void main(void)
 	} // main loop
 }
 
+/** RTC square wave input ISR to synchronize to seconds and count them */
 void EXTI_ISR(SQUARE_WAVE_PIN)(void)
 {
     exti_reset_request(EXTI(SQUARE_WAVE_PIN)); // reset interrupt
@@ -385,6 +386,7 @@ void EXTI_ISR(SQUARE_WAVE_PIN)(void)
     rtc_tick_flag = true; // let main know a second passed
 }
 
+/** frame timer ISR */
 #if FRAME_TIMER==1
 void tim1_up_isr(void)
 #else