update

sys/raspi_gpio/info.txt

@@ -1,11 +1,14 @@
 GPIO only HAL functions for Raspberry Pi
 
-Manly based of the following (german) web sites:
-
-https://www.elektronik-kompendium.de/sites/raspberry-pi/2202101.htm
-
-http://www.netzmafia.de/skripten/hardware/RasPi/RasPi_GPIO_C.html
+This example is based on the bcm2835 library from Mike McCauley
 
 The bcm2835.[hc] files are under GPL v3 copyright.
 taken from here:
 http://www.airspayce.com/mikem/bcm2835/
+
+The resulting code will work, bit will be slow because super user access is missing.
+To speed up the exection, run the result unter super user either with "sudo" or 
+by raising the rights of the generated executable:
+
+sudo chown root:root ./main
+sudo chmod u+s ./main

sys/raspi_gpio/u8g2_hello_world/main.c

@@ -1,3 +1,16 @@
+/*
+
+  main.c
+
+  hello world example for raspberry pi
+
+  For speedup run this example as root, either wis
+    sudo ./main
+  or by setting the superuser bit:
+    sudo chown root:root ./main
+    sudo chmod u+s ./main
+
+*/
 
 #include "raspi_gpio_hal.h"