Diff: mcp4725.cpp

Revision:

5:fa31978934fd

Child:

6:e83ec147be06

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mcp4725.cpp	Fri Apr 01 08:40:34 2016 +0000
@@ -0,0 +1,97 @@
+#include "mcp4725.h"
+#include "mbed.h"
+ 
+ 
+#define VERSION_MCP4725_SRC "0.20"
+ 
+MCP4725::MCP4725(I2CInterface* i2cinterface, int device_address_bits, float Vdd_):
+     _i2c_interface(i2cinterface),getVersion( VERSION_MCP4725_HDR,VERSION_MCP4725_SRC, __TIME__, __DATE__)
+{
+    Vdd=Vdd_;
+    // Assemble the full I2C device address.
+    _device_address = 0xC0; // Prime the full device address with the device code.
+    _device_address |= (device_address_bits<<1);
+}
+ 
+int MCP4725::getDACvalue(int& value, int ch){
+    // has to limit to reading only the dac value not the other items. 
+    enum PowerMode mode; enum PowerMode mode_eeprom; int dac_value; int dac_value_eeprom; bool eeprom_write_in_progress;
+    int status = read( mode, mode_eeprom,  dac_value, dac_value_eeprom,  eeprom_write_in_progress);
+    value=dac_value;
+    return status;
+}
+ 
+ 
+int MCP4725::getVoltage(float &voltage, int ch){
+  int value;
+  int status =getDACvalue(value);
+  voltage  =  Vdd * (float) value / 4096;
+  return status; 
+ }   
+ 
+ 
+int MCP4725::read(enum PowerMode& mode, enum PowerMode& mode_eeprom, int& dac_value, int& dac_value_eeprom, bool& eeprom_write_in_progress)
+{
+    char data[5];
+    int result;
+    
+    // Read the raw data from the device.
+    result = _i2c_interface->read(_device_address, data, sizeof(data)/sizeof(*data), false);
+    
+    // Parse the raw data, extracting our fields. Refer to MCP4725 ref manual, section 6.2
+    if (result == 0)
+    {
+        eeprom_write_in_progress = (data[0] & 0x80)? false:true;
+        
+        mode = (enum PowerMode) ((data[0] & 0x06)>>1);
+        
+        dac_value  = (data[1]<<4) + (data[2]>>4);
+        
+        mode_eeprom = (enum PowerMode)((data[3] & 0x60)>>5);
+        
+        dac_value_eeprom = ((data[3] & 0x0F) <<8) + data[4];
+    }
+     
+    return result;
+}
+ 
+ 
+int MCP4725::setDACvalue( int value, int ch){
+    return write( Normal, value, false);
+}
+ 
+ 
+int MCP4725::setVoltage (float voltage, int ch){
+    int value = 4096 * voltage /Vdd; 
+    return write( Normal, value, false);
+}    
+    
+ 
+ 
+ 
+ 
+int MCP4725::write(enum PowerMode mode, int dac_value, bool writeToEeprom)
+{
+    char data[3]={0};
+    int write_command;
+    
+    //Which write command are we to use?
+    if (writeToEeprom == true)
+    {
+        //Write DAC Register and EEPROM
+        write_command = 3;
+    }
+    else
+    {
+        //Write DAC Register
+        write_command = 2;
+    }
+    
+    //Assemble our three bytes of data - Refer to MCP4725 ref manual, section 6.
+    data[0] = (write_command <<5) | ((int)mode<<1);
+    data[1] = (dac_value>>4);
+    data[2] = (dac_value<<4);
+    
+    // Now write them to the device.
+    return _i2c_interface->write(_device_address, data, sizeof(data)/sizeof(*data), false);
+}
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