Revision 2:8a71db02417b, committed 2013-11-12

Comitter:

RodColeman

Date:

Tue Nov 12 12:57:07 2013 +0000

Parent:

1:64570234d7b5

Child:

3:f5b60d166896

Commit message:

v4.29: first release with RF Detect I2C trimmer (manual only)

Changed in this revision

--- a/AD5258.cpp	Mon Nov 11 13:08:08 2013 +0000
+++ b/AD5258.cpp	Tue Nov 12 12:57:07 2013 +0000
@@ -54,4 +54,17 @@
     foo[0] = 0xA0;                       // command to store RDAC to EE
     foo[1] = 0x80;                       // NOP to restore low power mode
     _i2c.write(_address, foo, 1);      
+  }
+  
+   // software write protect
+ void AD5258::writeProtect(bool enable)  {
+    char foo[2];
+    foo[0] = 0x40;                       // command to store RDAC to EE
+    if (enable) {
+        foo[1] = 0x01;                       // SET WP
+    }
+    else {
+        foo[1] = 0x010;                       // RESET WP (enable writes)
+    }
+    _i2c.write(_address, foo, 2);      
   }
\ No newline at end of file

--- a/AD5258.h	Mon Nov 11 13:08:08 2013 +0000
+++ b/AD5258.h	Tue Nov 12 12:57:07 2013 +0000
@@ -3,7 +3,21 @@
 #ifndef MBED_AD5258_H
 #define MBED_AD5258_H
  
-// Interface to the AD5258 I2C 6-Bit digital Potentiometer
+// Interface to the AD5258 I2C 64-step (0x00 to 0x3F)6-Bit digital Potentiometer
+
+// measure reference voltage on the pin6 of U3 LM293
+// be sure to remove R11, and check R4 is 220
+
+/*Examples: RDAC =
+0x00, Vref=1,0V
+0x03, Vref=1,1V
+0x05, Vref=1,2V
+0x0F, Vref=1,5V
+0x20, Vref=1,82V  // default
+0x30, Vref=2,0V
+0x3F, Vref=2,2V 
+*/
+
 
 class AD5258 {
 public:
@@ -55,6 +69,17 @@
     *
     */
     void restore(void);
+    
+    
+    /** update write protect bit
+    *
+    * @param enable: TRUE to SET WP, FALSE to lift WP
+    */
+ 
+    void writeProtect(bool enable);
+ 
+    //  TODO: tolerance register access
+ 
  
  
 private: