RF communication data error detection

RE: RF communication data error detection

powerup — Tue, 28 Nov 2017 01:41:36 GMT

Thank you very much!!

RE: RF communication data error detection

ovrebekk — Mon, 27 Nov 2017 08:40:50 GMT

Without CRC checking the content of the payload is irrelevant.
As long as you have the correct address, RF bitrate and RF channel the packet will be received, even if the protocol is incorrect or there are bit errors in the packet.

This means that you can't really trust the data you receive, since it could be sent by some other device, or it could be a false packet caused by random noise in the receiver. As a fun experiment, try to set the address length to 2 or 3 bytes and disable the CRC, then you will receive a lot of false packets ;)

Best regards

RE: RF communication data error detection

powerup — Mon, 27 Nov 2017 07:53:50 GMT

The RX_PW_Px register setting was incorrect.

Thank you.

If you ever disable CRC, can you tell me why it was possible to communicate?

Best regards

RE: RF communication data error detection

ovrebekk — Fri, 24 Nov 2017 15:18:06 GMT

How do you configure the RX_PW_Px register in the PRX, and does it correspond to the length of the packet sent from the TX?

If there is a mismatch between the length of the TX packet, and the configuration in the RX, then the CRC check will fail.

Best regards

RE: RF communication data error detection

powerup — Fri, 24 Nov 2017 07:49:03 GMT

Tx(nRF24L01+)

  NRF_WriteRegister(0x07, 0x00);
  NRF_WriteRegister(0x01, 0x00); 
    
  NRF_FlushTX();
  NRF_FlushRX();
   
  nRF24_CSN_H();
  
  NRF_WriteRegister(0x05, 0x02); 
  NRF_WriteRegister(0x06, 0x06);
  NRF_WriteRegister(0x00, 0x0E);  // CRC 2byte
  NRF_WriteRegister(0x03, 0x03); 
  NRF_WriteRegister(0x07, 0x70);

Rx(nRF24LU1+)

CONFIG : 0x0F
EN_AA : 0x00
EN_RXADDR : 0x03
SETUP_RETR : 0x00
RF_CH : 0x02
RF_SETUP : 0x06

All remaining values are default.

Best regards

RE: RF communication data error detection

ovrebekk — Wed, 22 Nov 2017 16:11:50 GMT

There is no reason adding CRC should make the communication fail, unless the PTX and PRX had incompatible settings to begin with.
If they are configured differently in terms of mode, payload length, address length and so forth, then the CRC check will pick it up and discard the packet.

Could you attach the state of the configuration registers for the PTX and PRX?

Best regards