![]() If (Wire.endTransmission(false) = 0) //false=send restart (IMPORTANT-THIS ENDTRANSMISSION DOES NOT SEND STOP!). No need to send stop as done automatically Uint8_t BytesReceived = Wire.available() //The slave can send less than was requested Wire.requestFrom(0x5a, 2) //Address, no of bytes ![]() Result: 0=success, 1=tx buff overrun, 2=NACK on address tx, 3=NACK on data tx, 4=other error Uint8_t Result = Wire.endTransmission(true) //true=send stop While (1 < Wire.Seems to be 7 bit value with bit0=lower bit (not I2C RW bit), so left shifted by 1 when sent over the wire. This make the communication not byte to byte controlled as I want it to be for my need. I realized that if I wanted to make an Arduino slave, when receiving from master, it actually reads from a buffer that is already previously received. But let’s start with the problem found in the Wire. ![]() When the limitations were somehow fixed, even though the small number of modifications (it is somehow a sort of hacking of the library) I found that the my final result were so useful to me that I thought was worth to write a short article about it. Then, when experimenting with a portability of a project in the Arduino environment, I started to trying the official Wire library, discovering some incompatibilities for my needs. I have spent a lot of time on playing and later working on the I2C buses. I almost always used self developed libraries, both for learning and job requirement purposes.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |