nrf8001 Reset - RDYN and REQN behavior

[brian]

Hi,

I'm developing some code for an AVR MCU with the Adafruit nrf8001 and had a question about the expected behavior of the handshaking lines, REQN and RDYN

My understanding is, once the device comes out of Reset (Reset Low -> High) the RDYN line should output to logic low indicating that the DeviceStartedEvent is ready to be clocked out over SPI like so.

To clock the event out, the user application should then toggle the REQN line low and begin clocking data out over SPI. However, when the REQN line transitions (from either High to Low or vice versa) I see a small pulse on the RDYN line (like so)

Any ideas what this could be and if this is ok? So far my application only goes in an infinite loop of Reseting the device, and driving the REQN low once RDYN also goes low, waits ~100ms then resets the nrf8001 again

EDIT: Added new picture of "glitch" after device reset

[David Edwin]

What is the pull on the REQN and RDYN lines ?

[brian]

@david-edwin pull resistors? There is a 10k on board pull up to VDD for RDYN and no pull on REQN

[David Edwin]

Are you using the internal pulls in the AVR as well ?

[brian]

The behavior still remains both with and without the internal AVR pullups

[David Edwin]

More questions: Is this a new board that you have made or are you just wiring this up with a bread board ?

What is the nRF8001 version, this is on the markings on the top of the IC .

I find it odd that the glitch on the RDYN seems to be following the state transition on the REQN line. Is this true ?