fate of packets in esb fifo on ptx transmission failure

RE: fate of packets in esb fifo on ptx transmission failure

bjorn-spockeli — Wed, 14 Jun 2017 11:21:11 GMT

Have you tried stopping and starting the transmission using nrf_esb_stop_tx and nrf_esb_start_tx respectively?

RE: fate of packets in esb fifo on ptx transmission failure

Adrien Rapeaux — Wed, 14 Jun 2017 09:52:08 GMT

Contrary to my expectations, it actually worked this time! But upon further exploration, I could reproduce the behaviour if I filled the FIFO multiple times with failed transmissions. However, the transmissions were stopped not because of a full FIFO, but because the timer responsible for regularly sending packets was disabled. I am not sure why or how this happens, but deactivating and reactivating it allowed the program to send packets again. One remaining question is if the packets are kept in the FIFO upon transmission failure, is there any way to get them transmitted again, or out of the FIFO? We don't have access to FIFO memory.

RE: fate of packets in esb fifo on ptx transmission failure

bjorn-spockeli — Wed, 14 Jun 2017 09:00:27 GMT

Does nrf_esb_flush_tx() return NRF_SUCCESS?

RE: fate of packets in esb fifo on ptx transmission failure

Adrien Rapeaux — Tue, 13 Jun 2017 13:59:01 GMT

Calling nrf_esb_flush_tx() does not resolve the issue: the error code when attempting to write a new packet to the FIFO is still 4 (no memory)

RE: fate of packets in esb fifo on ptx transmission failure

bjorn-spockeli — Tue, 13 Jun 2017 13:49:30 GMT

You should only have to call nrf_esb_flush_tx() to empty the FIFO.

RE: fate of packets in esb fifo on ptx transmission failure

Adrien Rapeaux — Tue, 13 Jun 2017 13:32:42 GMT

Hello Bjorn, and thank you for your comment. What I'm wondering is then how to resume transmission of failed packets when my FIFO is full, assuming it was filled because packets failed to be acked. Is there a special function, or must I uninitialize and then reinitialize esb?

RE: fate of packets in esb fifo on ptx transmission failure

bjorn-spockeli — Tue, 13 Jun 2017 12:25:47 GMT

Yes, the payload will stay in the FIFO when you get NRF_ESB_EVENT_TX_FAILED so that you're able to retransmit the payload in the FIFO. You should get the NRF_ERROR_NO_MEM error code from nrf_esb_write_payload() if you try to write to a full FIFO.