Diff: main.cpp

Revision:

0:71c5512ccb49

diff -r 000000000000 -r 71c5512ccb49 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Jun 16 15:41:02 2013 +0000
@@ -0,0 +1,34 @@
+/*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))
+#define FIO0PIN0 (*( volatile unsigned char *)(0x2009C014))
+
+int main()
+{
+    FIO2DIR0=0xFF;     // set port 2, lowest byte to output
+    while(1) {
+        for (int i=1; i<=3; i++) {
+            FIO0PIN0 |= 0x02;       // set port 2 pin 1 high (mbed pin 25)
+            delay();
+            FIO0PIN0 &= ~0x02;      // set port 2 pin 1 low
+            delay();
+        }
+
+    }
+}
+//delay function
+void delay(void)
+{
+    int j;                      //loop variable j
+    for (j=0; j<1000000; j++) {
+        j++;
+        j--;                      //waste time
+    }
+}
+
+