Trouble Shooting I²C on PIC24FJ32GA102

Below are several steps to take when debugging I²C on a 16-bit PIC®:

  • Try configuring the I²C module using MPLAB® Code Configurator (MCC) to ensure the registers are initialized correctly.
  • Make sure the pins to be used are configured as digital pins as the I²C module is a digital peripheral.
  • Once enabled, the I²C module must have ownership of the pins. Make sure no other module with higher priority has control over the pins to be used. According to the device datasheet, the I²C pins (14 and 15) are shared with several other peripherals. These peripherals cannot be active if I²C is being used.
  • Make sure to have the latest MPLAB X IDE and MPLAB XC16 compiler installed.
  • Make sure the firmware is running by entering debug mode.
© 2018 Microchip Technology, Inc.
Notice: ARM and Cortex are the registered trademarks of ARM Limited in the EU and other countries.
Information contained on this site regarding device applications and the like is provided only for your convenience and may be superseded by updates. It is your responsibility to ensure that your application meets with your specifications. MICROCHIP MAKES NO REPRESENTATIONS OR WARRANTIES OF ANY KIND WHETHER EXPRESS OR IMPLIED, WRITTEN OR ORAL, STATUTORY OR OTHERWISE, RELATED TO THE INFORMATION, INCLUDING BUT NOT LIMITED TO ITS CONDITION, QUALITY, PERFORMANCE, MERCHANTABILITY OR FITNESS FOR PURPOSE. Microchip disclaims all liability arising from this information and its use. Use of Microchip devices in life support and/or safety applications is entirely at the buyer's risk, and the buyer agrees to defend, indemnify and hold harmless Microchip from any and all damages, claims, suits, or expenses resulting from such use. No licenses are conveyed, implicitly or otherwise, under any Microchip intellectual property rights.