SPIM - MISO connection has very low level

[uC_newbie]

Hi,

i used the SPIM example to create a connection with my ads1256. on my breadboard it worked properly. now i switched to a layouted board and every SPI pin is working nicely EXCEPT for the Miso pin. Thing is when i measure the voltage level with an oscilloscop i see maybe 300 mV max. the signal looks roughly like the ADC is trying to output the proper data but for some reason cannot create suffiencent voltage levels.

things i did:

• tried Spi1 Module: no effect
• tried using a different pin for MISO - no effect: it then shows the same behaviour on the newly configurated MISO pin. this indicates to me that something is wrong with the programming
• tried different hardware - no effect, so the issue is unlikely to be related to a damaged component.

anyone got an idea?

[bjorn-spockeli]

So the ADS1256 is a breakout board that you connect to a custom nRF51/52 board? Have you been developing on one of our DKs?