Large system, i2C to go with Freepascal on AVR, code help

[pascalbythree]

Code: Pascal  [Select][+][-]

1. unit i2c;
2.  
3. interface
4.  
5. type
6.   { TI2CMaster }
7.   TI2CMaster = object
8.     retVal: byte;
9.     procedure init(bitRate: byte);
10.     // Low level functions
11.     // Address should be left adjusted 7-bit value
12.     function start(address: byte; readTransaction: boolean): boolean;
13.     function readByte(out data: byte; ack: boolean): boolean;
14.     function writeByte(data: byte): boolean;
15.     function stop: boolean;
16.  
17.     // Higher level implementation
18.     function ReadByteFromReg(i2caddress, regAddress: byte; out data: byte): boolean; overload;
19.     function ReadBytesFromReg(i2caddress, regAddress: byte; data: PByte; size: byte): boolean; overload;
20.     function ReadBytes(i2caddress: byte; const data: PByte; size: byte): boolean; overload;
21.  
22.     function WriteByteToReg(i2caddress, regAddress: byte; const data: byte): boolean; overload;
23.     function WriteBytesToReg(i2caddress, regAddress: byte; data: PByte; size: byte
24.       ): boolean; overload;
25.     function WriteBytes(address: byte; const data: PByte; size: byte): boolean;
26.  
27.     // data pointer should be pointer to flash memory
28.     function WriteBytesToReg_P(i2caddress, regAddress: byte; data: PByte; size: byte
29.       ): boolean;
30.  
31.     function clearStalledBus: boolean;
32.   end;

Still working on my system, in the meanwhile i want to know, if there is a better solution using:

Code: Pascal  [Select][+][-]

1. function readByte(out data: byte; ack: boolean): boolean;

Because it is a bi-directional bus.

[ccrause]

Still working on my system, in the meanwhile i want to know, if there is a better solution using:

Code: Pascal  [Select][+][-]

1. function readByte(out data: byte; ack: boolean): boolean;

Because it is a bi-directional bus.

It isn't clear what you want to implement.  I2C has a bi-directional bus yes, but it is limited to half-duplex communication where a master must initiate a transaction with a slave (read or write).  So a master can a) write data to a slave -> the slave reads the data, or b) request (read) data from a slave -> the slave writes the data.

[pascalbythree]

I more alike neem example code to send a byte from master to slave AND slave to master

So from i2c.pas back to i2cslave_unit.pas

through the same  init, like from TI2CMaster and backwards

without starting a new i2c_master.init(I2C_50kHz);

Is this possible somehow or do i always have to use 2 settings fore, fore and back ?

Reformulation: read and write not possible over the same stack ? Ju always need to start a new one? is this "half-duplex" ?

[pascalbythree]

Than you it got to work! Now to the etching!