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Can't get the I2C LPCOpen example to work (LPC812)

Question asked by zzzmqp on Jun 28, 2019
Latest reply on Jun 28, 2019 by Sabina Bruce

Hello,

 

sorry about such a basic question, but I can't get the LPCOpen I2C example to run out of the box.

It compiles and runs fine, but *nothing* happens on the I2C bus. (I have an oscilloscope hooked up to the I2C lines)

 

Environment:

  • MCUXpresso IDE v10.3.1 [Build 2233] [2019-02-20]
  • "periph_i2cm_interrupt" example from "lpcopen_2_19_lpcxpresso_nxp_lpcxpresso_812.zip" (came with IDE)
  • LPCXpresso LPC812 REV A board

 

I also tried the other I2C examples (i2cm_polling, i2cm_rom), but the result is the same. Neither I2C line will ever see any signal change.

I must be missing some super basic setting. Any ideas?

 

Thank you!

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