Diff: PCA9672.cpp

Revision:

0:9aab4157fdae

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/PCA9672.cpp	Sun Nov 24 12:34:47 2013 +0000
@@ -0,0 +1,48 @@
+#include "PCA9672.h"
+ 
+PCA9672::PCA9672(PinName sda, PinName scl) : _i2c(sda, scl)
+{
+    // Software Reset
+    _i2c.start();
+    while(_i2c.write(0x00) !=1);
+    while(_i2c.write(0x06) !=1);
+    _i2c.stop();
+ 
+    /* Software reset is not required. But, gives an 
+       indication if the selected I2C bus frequency works */
+}
+ 
+void PCA9672::frequency(int hz)
+{
+    _i2c.frequency(hz);
+}
+
+void PCA9672::direction(uint8_t inputs)
+{
+    _pins = inputs & 0xff;
+}
+ 
+void PCA9672::write(char value)
+{
+    if (_pins > 0)
+    {
+        _i2c.start();
+        _i2c.write(PCA9672_ADDR);
+        _i2c.write(value | _pins); // all input pins must have a logic 1 as value
+        _i2c.stop();
+    }
+}
+ 
+int PCA9672::read(void)
+{
+    _i2c.start();
+    _i2c.write(PCA9672_ADDR | 1);
+    uint8_t val = _i2c.read(0); // expect NACK
+    _i2c.stop();
+    return val;
+}
+ 
+PCA9672::~PCA9672()
+{
+ 
+}
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