empro +

docs/Embedded Programming.md

@@ -110,12 +110,38 @@ So after uploading the blink code + serial, connect the ftdi board to hello boar
 
 4. Programming with avr-gcc
 ---
-http://archive.fabacademy.org/archives/2016/doc/makefile.html
+I used Arduino IDE and the same physical setup (FabISP+ribbon cable+ hello board) and wrote the code in avr-gcc.
+Arduino IDE operates avr-gcc in the background. And has an interface over it. So it works easily.
 
+This is the [code file](docs/images/empro/t45-blink-avr-gcc.zip).  
+```
+#include <avr/io.h>
+#include <util/delay.h>
+
+const int led=PB4;
+const int sw=PB3;
+
+ int main(){
+  DDRB |= (1<<led);
+  DDRB &= ~(1<<sw);
+
+  while (1){
+    if (!(PINB & (1<<sw)))
+      PORTB |= (1<<led);
+    else
+      PORTB &= ~(1<<led);  
+  }
+ }
+```
+
+Basically you inlcude avr/io and delay libraries so that you can use the arduino commands.  
+Also, the pin numbers are recognised by their ports PB# instead of pin #.  
+
+![](./images/empro/gif.gif)  
 
 5. Programming with Atmel Studio
 ---
-
+can't in mac. will do this later on a windows system...   
 
 
 5. References