Define TX and RX buffer size

[elademir]

Hi Rambo, congratulation for your job, your library works fine, thanks!

I have a question, the max value for .available() is TWI_RX_BUFFER_SIZE-1, by default this value is 16-1=15. I cannot change the value defining TWI_RX_BUFFER_SIZE with 32,64,etc. into a sketch, always gives me a max value of 15. Why this occurs?

A part of my code(the relevant for this issue)

define TWI_RX_BUFFER_SIZE ( 64 )

define TWI_TX_BUFFER_SIZE ( 64 ) //This do not works

void receiveEvent(byte howMany)
{ tws_delay(40); //waits all data reg=TinyWireS.available(); //this value has a max value of 15 while(TinyWireS.available()) { char c = TinyWireS.receive(); //Flush buffer } i2c_regs[0]=reg; //prepare "reg" value to send into the next request reg_position = 0; }

[rambo]

You need to define the constants before including the library so

define TWI_RX_BUFFER_SIZE ( 64 )

define TWI_TX_BUFFER_SIZE ( 64 )

include

But there might be some issue with the order of defines and the Arduino preprocessor.

In any case that is a horrible way to do whatever you are trying to do (I can't quite figure it out), if you want to transfer text to write out on a display look at https://github.com/HelsinkiHacklab/reactor/blob/master/software/mwdisplay/mwdisplay.ino (it only has a few 7-segment displays but the same idea can be applied to any lenght of string you can fit into RAM).

[elademir]

Thanks Rambo, it works perfect. In fact the sketch only sends the data recibed packet size to the master. I want to control the attiny for different tasks like a mini DAQ system. I will check your example as guideline for my project.

regards!