wimbeaumont Project / DevInterfaces

This are general defs and base class interfaces. ( DACInterface, I2CInterface) to be used with I2C devices

Dependents:   MCP23009tst AT30TSE752TST MCP4728setaddrProg mbedSerialInterface_talkback2 ... more

The DevInterfaces class is used for a more general support of a number of I2C devices.

For the moment this is MCP4728 Quad DAC.

The idea is to write a libs for the I2C devices (and perhaps later SPI , ... devices) not restricted to a certain hardware platform.

So there is the I2CInterface. This is a ( not pure) virtual class. A pointer to this class is used for the I2C device lib (like the MCP4728 class https://developer.mbed.org/users/wbeaumont/code/MCP4728/ ) to communicate with the I2C interface. The I2C interface is kept simple as possible. So it has to be applied for "tested environments". I2C Bus timeouts etc. are hard to debug with such a simple interface. This kind of interface is also not suitable for optimal performance. The user has to take care of issues of blocking devices, parallel processes etc. This can be dealt with in the implementation of the I2CInterface class

The aim of this project is to generate code for these devices on different platforms without doing the painstaking work of looking up all the register details.

There is an implementation of the I2CInterface for the MBED , tested with the FRDM-KL05Z platform. https://developer.mbed.org/users/wbeaumont/code/I2Cinterfaces/

A very simple application on a MBED can be found in https://developer.mbed.org/users/wbeaumont/code/MCP4728test/

I2CInterface.h@0:da1fb7dd363f, 2015-10-23 (annotated)

Committer:
wbeaumont
Date:
Fri Oct 23 19:34:53 2015 +0000
Revision:
0:da1fb7dd363f
Child:
5:b5c9eb2330dc
basics works

Who changed what in which revision?

UserRevisionLine numberNew contents of line
wbeaumont 0:da1fb7dd363f 1 #ifndef __I2CINTERFACE__
wbeaumont 0:da1fb7dd363f 2 #define __I2CINTERFACE__
wbeaumont 0:da1fb7dd363f 3
wbeaumont 0:da1fb7dd363f 4 #include "getVersion.h"
wbeaumont 0:da1fb7dd363f 5
wbeaumont 0:da1fb7dd363f 6 #define I2CINTERFACE_HDR_VER "0.33"
wbeaumont 0:da1fb7dd363f 7
wbeaumont 0:da1fb7dd363f 8 class I2CInterface : public virtual getVersion{
wbeaumont 0:da1fb7dd363f 9 private:
wbeaumont 0:da1fb7dd363f 10 protected :
wbeaumont 0:da1fb7dd363f 11 void* callback();
wbeaumont 0:da1fb7dd363f 12
wbeaumont 0:da1fb7dd363f 13 public :
wbeaumont 0:da1fb7dd363f 14 I2CInterface():getVersion( I2CINTERFACE_HDR_VER ,I2CINTERFACE_HDR_VER , __TIME__, __DATE__){}; //Create an I2C Master interface
wbeaumont 0:da1fb7dd363f 15 virtual void frequency (int hz){};// Set the frequency of the I2C interface.
wbeaumont 0:da1fb7dd363f 16 virtual int read (int address, char *data, int length, bool repeated=false){
wbeaumont 0:da1fb7dd363f 17 return 0;};//Read from an I2C slave.
wbeaumont 0:da1fb7dd363f 18 virtual int read (int ack){return 0;};// Read a single byte from the I2C bus.
wbeaumont 0:da1fb7dd363f 19 virtual int write (int address, const char *data, int length, bool repeated=false){
wbeaumont 0:da1fb7dd363f 20 return 0;
wbeaumont 0:da1fb7dd363f 21 };// Write to an I2C slave.
wbeaumont 0:da1fb7dd363f 22 virtual int write (int data){return 0;};// Write single byte out on the I2C bus.
wbeaumont 0:da1fb7dd363f 23 virtual void start (void){};// Creates a start condition on the I2C bus.
wbeaumont 0:da1fb7dd363f 24 virtual void stop (void){};// Creates a stop condition on the I2C bus.
wbeaumont 0:da1fb7dd363f 25 virtual int transfer (int address, const char *tx_buffer, int tx_length, char *rx_buffer, int rx_length, void* callbackptr, bool repeated=false){
wbeaumont 0:da1fb7dd363f 26 return 0;
wbeaumont 0:da1fb7dd363f 27 }; // Start non-blocking I2C transfer. not yet clear how to deal with the callback
wbeaumont 0:da1fb7dd363f 28 // proposol here is for the implementation a spefic call back function ,that includes the event type
wbeaumont 0:da1fb7dd363f 29
wbeaumont 0:da1fb7dd363f 30 };
wbeaumont 0:da1fb7dd363f 31
wbeaumont 0:da1fb7dd363f 32 #endif