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  • Case ID: 339411
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First byte of payload interpreted as device address, changing BALEN has no effect

alex101

Hi,

I'm transmitting using the nRF24L01P and using the nRF52810 as the receiver, 5 byte address.

We send a 2 byte packet usually 0x00, 0x00 until data is ready.
If I set any bits on the 2nd byte it receives fine but setting bits on the first byte, it stops receiving any data until those bits are set back to 0x00.

I think it's just luck that the receiver is working due to the payload first byte is 0x00 and the PREFIX is also 0x00. Changing BALEN from 4 to 3 or 2 makes no difference.
On the nRF24 TX side the prefix/LSB of the address is actually 0x01 but somehow the nRF52 is ignoring that and I also don't know where the nRF24 Packet Address Field 9bit is going, might be ignored too. I set PCNF0 to 0 to try and see if any of that data shows up in the PACKETPTR but it doesn't.

NRF52 setup:

NRF_RADIO->BASE0 = 0xEEE6464E;
NRF_RADIO->PREFIX0 = 0x00;
NRF_RADIO->PCNF0 = 0;
NRF_RADIO->PCNF1 = (RADIO_PCNF1_WHITEEN_Disabled << RADIO_PCNF1_WHITEEN_Pos) | (RADIO_PCNF1_ENDIAN_Big << RADIO_PCNF1_ENDIAN_Pos) | (4 << RADIO_PCNF1_BALEN_Pos) | (4 << RADIO_PCNF1_STATLEN_Pos) | (2 << RADIO_PCNF1_MAXLEN_Pos);
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