Problem after swaping nrf24l01+ modules with nrf24l01+ with PA and LNA

[MadSciencist]

Hello.

I'm using Tielen Marjle STM32 library for nrf24l01+ (https://stm32f4-discovery.net/2014/06/library-17-nrf24l01-stm32f4xx/) which worked great till now, when I decided to swap old modules with PA LNA versions. Basically I have no SPI communication with these modules (I'm not receiving status byte). I have 4 of these modules to test - each one behaves the same.

I'm using custom PCB with LDO 3.3V, properly voltage filtration and added even an extra capacitor 100uF on radio module pins. I can even hot-swap to old modules and application is working great. 

I ran out of ideas.

[Kenneth]

Hi, I suggest you start by verify you have connected all pins correctly, maybe you have swapped some of them (e.g. MISO and MOSI). If you have access to a logic analyzer you may check the serial interface in more details. There is no known issue with the SPI interface of the nRF24L01, so likely it is an issue with conflicting pins.