RE: Trouble with Ack payloads, nrf51822 to nrf24L01+

m.wagner — Wed, 15 May 2019 09:43:16 GMT

I just stumbled across this issue, too and wondered why Nordic did this change and break compatibility with nRF24 devices. It still is like this in the SDK 15.3 ESB implementation. It's a bit of a shame that the known issues of the nrf_esb component were never addressed.

RE: Trouble with Ack payloads, nrf51822 to nrf24L01+

Matt — Tue, 01 Dec 2015 02:16:25 GMT

I seem to have found the solution. In the latest github release of the micro-esb library, the polarity of the NOACK bit was reversed. Reverting to the previous commit in micro-esb.c fixed my problem.

Steps:

1.) in the start_tx_transaction() function change

m_tx_payload_buffer[1] = m_pid << 1 | ((ack == 0 && m_config_local.dynamic_ack_enabled) ? 0x00 : 0x01);

m_tx_payload_buffer[1] = m_pid << 1 | ((ack == 0 && m_config_local.dynamic_ack_enabled) ? 0x01 : 0x00);

around line #327

2.) in the on_radio_disabled_esb_dpl_rx() function change

if (1 == (m_rx_payload_buffer[1] & 0x01))
{
      send_ack = true;
}

if (0 == (m_rx_payload_buffer[1] & 0x01))
{
      send_ack = true;
}

around line #746