I2C ReSTART returns Success

[stickbreaker]

This change restores compatibility with preexisting Arduino libraries that use Wire(). The ReSTART queuing operation is now hidden. Wire.endTransmission(id,len,FALSE); now returns I2C_ERROR_OK(0) to indicate success, though, Wire.lastError() will correctly return I2C_ERROR_CONTINUE to indicate the last Wire() operation was added to the command queue, and not executed. Since Wire.lastError() does not exist in main branch Arduino, this dichotomy is not obvious.

The number of queued operation is limited by the depth of the Wire() Tx/Rx buffers, currently 128 bytes each. Each Wire.Write() operation uses one byte of the Tx buffer, Wire.requestFrom(id,LEN,false); uses LEN bytes of the 128byte Rx buffer. If either buffer is exhausted before a STOP condition is issued, I2C_ERROR_MEMORY will be returned.

[digi-z]

Hello Stickbreaker
I use your wire.cpp and wire,h but get compilation erros for nodeMCU: i2cDebug and i2cGetStatus not declared. If I try to include esp32-hal-i2c.h I get faults that #includes are nested too deeply. How do I have to configure the libraries to be able to compile them?
Regards!

[stickbreaker]

@digi-z If you are using V1.0.1, either from an Arduino Boards Manager install, or the Cloned Github repo, All you need to do is include the Wire.h library in your sketch:

#include <Wire.h>

void setup(){
Serial.begin(115200);
Wire.begin(); // default 100khz, SDA and SCL as defined in pins.h
}

void loop(){
// use it
}

Chuck.