Then it enforces a start condition on the bus, sends the address of the slave and then sends a clock pulse for the acknowledgement bit. It will configure the I2C interface as master (when previously in slave mode this will be temporary). ![]() Wire.requestFrom() doesn't block until it receives data. I won't explain the full I2C interface here, since that is a bit too much for this answer. You completely misunderstand how I2C communication (that's what the Wire library does) works. Am I understanding this function incorrectly or is there something wrong in my implementation? Even before I've gotten a chance to run the master's code, the slave's "finished" output has instantly triggered. The problem here is that it's not actually blocking. In Arduino 1 (slave)'s code, I've placed the requestFrom call that should block until Arduino 0 sends that connect byte. Here, the master code waits on a signal (pin 2) (which is given by Arduino 1) that it is available, and then on connect, will send one connect byte to Arduino 1. As such, I created a simple demo of this handshake between the two devices as follows: // slave It doesn't seem to send any signal to the slave device that it should send anything, just does a simple wait. ![]() From what I understand, this "request" simply entails the master device simply blocking until it receives the necessary data. From the wiki, this function "requests" the device at the specified address to send data. This seems simple enough, so what I'm doing to avoid any kind of multithreading or callback functions is to use Wire.requestFrom(). Arduino 1 sends a confirmation byte to Arduino 0 (say, 's').Arduino 0 sends a connect byte to Arduino 1 (say, 'c').Arduino 1 signals Arduino 0 it is available.I'm working on creating a simple ACK/NACK handshake between 2 Arduino's that will essentially go like this:
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