Classes to interact with our Mbed.
Dependents: MCP4725I2Ctest MCP4725Translator
Fork of MCP4728 by
mcp4725.cpp
- Committer:
- katrijnverhasselt
- Date:
- 2016-04-01
- Revision:
- 5:fa31978934fd
- Child:
- 6:e83ec147be06
File content as of revision 5:fa31978934fd:
#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); }