HELP WITH NRF24L01+ AND ACK_PAYLOAD (not working)

[markiv]

I have two NRF24L01+ devices. My aim is to have one as PTX and the other as PRX replying with ACK_PAYLOAD. It is working with ACK enabled (without payload). However when ACK_PAYLOAD is enabled (through feature and dynamic payload registers), the PTX does not receive RX payload (TX_DS and RX_DR flags are not set) even though PRX is sending the payload (TX_DS on PRX is set). Can someone provide a config and implementation setting that has worked for them, since i am struggling to get mine to work. PTX config:

1. TX_ADDRESS = {0x34,0x43,0x10,0x10,0x01}
2. RX_ADDR_P0 = {0x34,0x43,0x10,0x10,0x01}
3. Enable Pipe0, Auto acknowledge
4. SETUP_RETR: 500us, 10 retransmit
5. RF_SETUP: 250 kbps (have tried with 1 mbps and 2 mbps without success as well)
6. FEATURE: enable ack payload, dynamic payload
7. DYNPD: enable dynamic payload pipe 0
8. CONFIG: 0x0e (disable all interrupts on IRQ, power up PTX, 2 bit CRC)

PRX config: same as PTX except RX_PW_0: number of bytes sent by PTX. CONFIG: 0x0f (disable all interrupts on IRQ, power up PRX, 2 bit CRC)

Thanks!

[Håkon Alseth]

Hi,

Your ARD setting is too low for 250kBit mode. Here's the table from the datasheet: ARD ACK packet size (in bytes) 1500μs All ACK payload sizes 1250μs < 24 1000μs < 16 750μs < 8 500μs Empty ACK with no payload

Best regards Håkon

[Håkon Alseth]

I was a bit quick on the trigger. I see that you've already tested on 1M/2M w/o success. Can you upload your source code (init and RF ISR) ?