I have spent many hours trying to upgrade a Mega-based application to the Due. The application is heavily I2C dependent. The I2C devices include: PCF8574 and MCP30317 I/O expanders DS1307 RTC EEPROMS Segment displays So far, everything works on the MEGA, nothing works on the DUE, either on SDA0…

Anyone had success with I2C on the Due?

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