Diff: main.cpp

Revision:

0:a93ac8eaed5e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Oct 21 15:43:13 2014 +0000
@@ -0,0 +1,34 @@
+#include "mbed.h"
+#include "SX1509.h"
+ 
+#define WAIT_TIME 0.1
+ 
+DigitalOut led1(LED1);
+SX1509  expander(p9, p10); // sda, scl
+ 
+int main()
+{
+    // Setup the I/O pins for open drain outputs to allow controlling grid of LEDs
+    expander.setOpenDrain(A,ON);
+    
+    // Main loop
+    while (1) {
+        
+        // Set the "A" rows to high, then shift the open drain outputs so they open for each row of LEDs
+        for (int i=0; i<8 ; i++) {
+            expander.setA(0xFF<<i+1);
+            expander.set(i+8);
+            wait(WAIT_TIME);
+        }
+ 
+        // Toggle the on-board led to indicate activity
+        led1=!led1;
+ 
+        // Now shift the rows off the led grid array
+        for (int i=0; i<8 ; i++) {
+            expander.setB(0xFF>>i+1);
+            expander.clear(i);
+            wait(WAIT_TIME);
+        }
+    }
+}
\ No newline at end of file