Is there some funky bug with internal pullup resistors on the RP2040.
I am using I2C1
If I try using GPIO2 SDA GPIO3 SCK and turn pullups on they sit at 0V
If I do it on GPIO6 & 7 or GPIO 10 & 11 they go correctly up to 3.3V
These lines of code don't work
I guess I am going to manually solder pullups under the PICO board ![:-(]( "Sad")
I am using I2C1
If I try using GPIO2 SDA GPIO3 SCK and turn pullups on they sit at 0V
If I do it on GPIO6 & 7 or GPIO 10 & 11 they go correctly up to 3.3V
These lines of code don't work
Code:
IO_BANK0->GPIO3_CTRL_b.FUNCSEL = 3; // Select GPIO3 function 3 PADS_BANK0_SET->GPIO3_b.PUE = 1; // Pullup GPIO3 IO_BANK0->GPIO2_CTRL_b.FUNCSEL = 3; // Select GPIO2 function 3 PADS_BANK0_SET->GPIO2_b.PUE = 1; // Pullup GPIO2
Statistics: Posted by LdB — Fri Jan 23, 2026 6:29 am