Pull-Up setting registers and ports 328uP

[Tinker]

I have a project which uses an Arduino pro mini (328P uP), and I2C display and a 3x4 keypad.
The keypad fails to work and I note one of the Column pins is always low. Looks like I need to turn on the pull up resisters, but my attempts at using C code cause an error which prevents me from compiling to target.

The on screen simulation works ok.

the Keypad is connected PD2-Col2, PD3-R0w1, PD4 Col3, PD5-Row4, PD6-Col1,PD7 Row3, PB0-Row2
it appears that PD2 is always low and even an external pullup will not change its state.

I looked for same C code to embed in the Supplementary code, but found not that work, and all give an error which stops the writing to device.
Any advice or help gratefully received
Tinker

[mnfisher]

See https://flowcode.co.uk/forums/viewtopic ... 1307#p1307

Martin

[Tinker]

Thanks for the info Mnfisher, the two boards I have are looking duff, so for the project I am doing I am switching to ESP32-C

[mnfisher]

Unlucky to get two duff boards? Check that the keypad isn't faulty - and the Col2 pin shorted to ground?

Martin