Diff: mcp4725.cpp

Revision:

0:3214e3bbf25c

Child:

5:3e6ffce1eea2

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mcp4725.cpp	Sun Oct 27 13:49:35 2013 +0000
@@ -0,0 +1,80 @@
+#include "mcp4725.h"
+#include "mbed.h"
+
+MCP4725::MCP4725(PinName sda, PinName scl, BusFrequency bus_frequency, int device_address_bits)
+{
+    _i2c_interface = new I2C(sda, scl);
+    
+    //Set the frequency
+    int freq=0;
+    switch(bus_frequency)
+    {
+        case Standard100kHz:
+            freq = 100000;
+            break;
+        case Fast400kHz:
+            freq = 400000;
+            break;
+        case HighSpeed3_4Mhz:
+            freq = 3400000;
+            break;
+    }
+    _i2c_interface->frequency(freq);
+    
+    // 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::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::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);
+}
\ No newline at end of file