Diff: main.cpp

Revision:

0:62e4724eaaaf

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Jun 16 15:40:24 2013 +0000
@@ -0,0 +1,27 @@
+/*Program Example 14.1: Sets up a digital output pin using control registers, and flashes an led.                                      
+                                                                         */
+// function prototypes                                   
+void delay(void);
+
+//Define addresses of digital i/o control registers, as pointers to volatile data
+#define FIO2DIR0       (*(volatile unsigned char *)(0x2009C040)) 
+#define FIO2PIN0       (*(volatile unsigned char *)(0x2009C054))
+
+int main() {
+  FIO2DIR0=0xFF;     // set port 2, lowest byte to output
+  while(1) {
+    FIO2PIN0 |= 0x01;     // OR bit 0 with 1 to set pin high
+    delay();
+    FIO2PIN0 &= ~0x01;   // AND bit 0 with 0 to set pin low
+    delay();
+  }
+}
+//delay function
+void delay(void){                                         
+  int j;                      //loop variable j
+  for (j=0;j<1000000;j++) {     
+    j++;
+    j--;                      //waste time
+  }
+}
+