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It only puts the data into the libraries internal buffer. Wire.write () does not send anything over the I2C lines. Maybe you are misunderstanding how the Wire library works. Or is there any other library which could send these variables from the Uno to the Mega. Is it another Arduino If yes, you need to show us the code for that too. The slave (Arduino Uno) is sending the data to the master (Arduino Mega). Ugh.Is there any way I can increase the buffer size? Note that prepareCommandBitsWire doesn't capitalize the whole word WIRE. Obviously substitute your sercom for sercom3 if you are creating another I2C interface or moving the default one, but all of the stuff needed is in SERCOM.h - sendDataMasterWIRE and similar. Granted, I have to keep track of when the array is empty to know when to stop, but otherwise not a big deal. Sercom3.prepareCommandBitsWire(WIRE_MASTER_ACT_STOP) equivalent to Wire.write() but does not use the txbuffer Sercom3.startTransmissionWIRE(0x21, WIRE_WRITE_FLAG) equivalent to Wire.beginTransmission() use Wire library to send three bytes to device 0x21

Is there anything stopping me from addressing the SERCOM directly? This is a little difference since I may have to transfer slightly over 4k bytes in one go. Writing big arrays to an EEPROM isn't a huge deal since it has a 32 byte page size anyway, just split at page boundaries and the Wire lib can handle 32 byte transfers without issue. If you want continuous streaming, write your own handler to work like Serial. you only block when the buffer does not empty fast enough to keep up with your writes. Is there any way I can increase the buffer size The slave (Arduino Uno) is sending the data to the master (Arduino Mega). To avoid blocking calls to Serial.write (), you can first check the amount of free space in the transmit. If the transmit buffer is full then Serial.write () will block until there is enough space in the buffer. But I could not find the buffer size definition in the corresponding file for the Arduino Due. If there is enough empty space in the transmit buffer, Serial.write () will return before any characters are transmitted over serial. Allowed data types: array of char or byte. buffer: the buffer to store the bytes in. See the list of available serial ports for each board on the Serial main page. Syntax Serial.readBytes (buffer, length) Parameters Serial: serial port object. 702 opened on May 20 mgrusin Error: unable to find CMSIS-DAP device. To change the serial buffer size for the Mega, I know the buffer size is defined in the Hardwareserial.h at C:Arduinohardwarearduinoavrcoresarduino. Serial.readBytes () inherits from the Stream utility class. Other interrupt driven peripherals handle transparently e.g. Issues list Please implement setWireTimeout() in SAMD Wire library. You have to handle the splitting into small bursts that fit the Wire buffer.

Repeat with the next few bytes until finished. It blocks until the whole buffer send has been completed. Then it starts the I2C interrupt sequence. The Wire llibrary expects you to fill its small buffer.