Diff: main.cpp

Revision:

0:b0247e85bf0e

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Dec 07 13:56:12 2014 +0000
@@ -0,0 +1,30 @@
+#include "mbed.h"
+#include "my_i2c.h"
+
+DigitalOut myled(LED1);
+
+// Connections made:
+// SDA to pin9  of LPC4088 QSB
+// SCL to pin10 of LPC4088 QSB
+// on I2C bus is PCF8574 connected at sub-address 0 (0x40).
+// all supplied at 3.3V
+// no external pullup (5K internal pullup used by my_i2c functions)
+// 
+// note in the my_i2c functions a delay of 1us is added after each transition of the pin.
+//      so this means an absolute maximum frequency of 500kHz.
+
+int main() {
+    
+    while(1) {
+        myled = 1;
+        my_i2cStart(0x40);
+        my_i2cWrite (0x55);
+        my_i2cStop();
+        wait(0.5);
+        myled = 0;
+        my_i2cStart(0x40);
+        my_i2cWrite (0xAA);
+        my_i2cStop();
+        wait(0.5);
+    }
+}