Diff: main.cpp

Revision:

0:7def09334278

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed May 07 10:02:43 2014 +0000
@@ -0,0 +1,43 @@
+/***********************************
+name:   BERTL14_I2C_TEST
+author: Wolfgang Raimann
+email:  rai@bulme.at
+description:
+    Die Taster vom I2C Expander werden direkt auf die LED's des Expander geschalten
+***********************************/
+
+#include "mbed.h"
+
+const int PCA9555_ADR = 0x40;
+#define I2C_WRITE   0
+#define I2C_READ    1
+
+I2C i2c(p28, p27);
+
+
+int main() {
+    char btn = 0;
+    // Config PCA9555 I0 as output    
+    i2c.start();
+    i2c.write(PCA9555_ADR + I2C_WRITE);
+    i2c.write(0x06);
+    i2c.write(0x00);
+    i2c.stop();    
+    
+    while(1) {
+        // Einlesen der Taster
+        i2c.start();
+        i2c.write(PCA9555_ADR + I2C_WRITE);
+        i2c.write(0x01);
+        i2c.start();
+        i2c.write(PCA9555_ADR + I2C_READ);
+        btn = i2c.read(0);
+        i2c.stop();
+        // Schreiben auf die LED's
+        i2c.start();
+        i2c.write(PCA9555_ADR + I2C_WRITE);
+        i2c.write(0x02);
+        i2c.write(~btn);
+        i2c.stop();
+    }
+}