Revision 2:1107ee23873a, committed 2017-12-12

Comitter:

sarahmarshy

Date:

Tue Dec 12 22:14:58 2017 +0000

Parent:

1:768491b5e55d

Commit message:

Update address of control register. Add function for checking which I2C channel is set.

Changed in this revision

diff -r 768491b5e55d -r 1107ee23873a tca9548a.cpp
--- a/tca9548a.cpp	Wed May 25 05:20:24 2016 +0000
+++ b/tca9548a.cpp	Tue Dec 12 22:14:58 2017 +0000
@@ -9,21 +9,25 @@
  
 #include "tca9548a.h"
  
-TCA9548A::TCA9548A( PinName sda, PinName scl, uint8_t i2c_address, PinName resetPin, uint32_t hz ) : i2c_(sda, scl), reset_pin(resetPin)
+TCA9548A::TCA9548A( PinName sda, PinName scl, uint8_t i2c_address, PinName resetPin) : i2c_(sda, scl), reset_pin(resetPin)
 {
     i2c_addr = i2c_address;
-    i2c_.frequency(hz);
 }
 
  
 void TCA9548A::select( uint8_t channel )
 {
-    char data; //create temporary char buffer
-    
     if(channel >= 8) return;
-    
-    data = 1 << channel;
-    i2c_.write( i2c_addr << 1, &data, 1);
+    char data[1];
+    data[0] = 1 << channel;
+    int err = i2c_.write(0xE0, data, 1);
+}
+
+char TCA9548A::check_set_channel()
+{
+    char data[1];
+    int err = i2c_.read(0xE1, data, 1);
+    return data[0];
 }
  
 void TCA9548A::reset( )

diff -r 768491b5e55d -r 1107ee23873a tca9548a.h
--- a/tca9548a.h	Wed May 25 05:20:24 2016 +0000
+++ b/tca9548a.h	Tue Dec 12 22:14:58 2017 +0000
@@ -92,7 +92,7 @@
      * @param reset TCA9546A reset pin (default: NC for simple pullup connected)
      * @param hz I2C bus frequency (default: 400kHz)
      */
-    TCA9548A( PinName sda, PinName scl, uint8_t i2c_address = 0x70, PinName resetPin = NC, uint32_t hz = 400000 );
+    TCA9548A( PinName sda, PinName scl, uint8_t i2c_address = 0x70, PinName resetPin = NC);
  
     /** Selecting a channel
      *
@@ -101,6 +101,11 @@
      * @param channel channel number
      */
     void select(uint8_t channel);
+    
+    /** Check which channel is enabled
+     * 
+     */
+    char check_set_channel();
  
     /** Reset TCA9546A
      *