Use of W5500 and nRF24L01 with the same arduino through SPI.

Using Arduino Networking, Protocols, and Devices
1

Hello everyone, I have a question about the SPI protocol. I have a project that requires the use of two devices:

  • W5500 (ethernet module)
  • nRF24L01 (2.4GHz radio module)

These two devices must communicate with a single arduino.
From what I understand, the SCLK, MOSI and MISO pins are in common for both, while the SS or CS pins must be changed according to the device that I have to use.

Now I have written a code to prove it works (both these devices are enabled on a low level):

#define PIN_W5500_SS 10
#define PIN_RADIO_SS 8

void loop() {
  digitalWrite(PIN_RADIO_SS, HIGH);
  digitalWrite(PIN_W5500_SS, LOW);
  int packetSize = Udp.parsePacket();
  if (packetSize) {
    Udp.read(recvData, 5);
    digitalWrite(PIN_W5500_SS, HIGH);
    digitalWrite(PIN_RADIO_SS, LOW); 
    radio.write(recvData, 5);
  }
}

What I do is to disable the unnecessary device and enable the one I have to request data from here.
Everything seems to work perfectly, but I have doubts:

  • Do I have to set a delay after changing the SS pin, to allow time for the device to do its thing or is it okay even without it?
  • In my case the change of the device happens very quickly (<10ms), can there be problems in the long run or not?

I hope I have been clear, thanks in advance.

2

let the libraries handle the CS pin

Ethernet.init(PIN_W5500_SS);

3

mcelcovan:
Everything seems to work perfectly, but I have doubts:

  • Do I have to set a delay after changing the SS pin, to allow time for the device to do its thing or is it okay even without it?
  • In my case the change of the device happens very quickly (<10ms), can there be problems in the long run or not?

I don't know but I suspect the answer is in the product datasheets for the different devices.

...R