RE: dynamic switching ptx and prx base on ESB

fangrui166 — Wed, 21 Mar 2018 06:16:59 GMT

thanks for your reply , I have implement a founction ,and it is works fine .but i'm not sure what side effect will be.

uint32_t nrf_esb_switch_to_ptx(void)
{
if(m_config_local.mode == NRF_ESB_MODE_PTX) return NRF_SUCCESS;
m_config_local.mode = NRF_ESB_MODE_PTX;
printf("%s\n",__func__);
nrf_esb_stop_rx();

// Clear PPI
NRF_PPI->CHENCLR = (1 << NRF_ESB_PPI_TIMER_START) |
(1 << NRF_ESB_PPI_TIMER_STOP) |
(1 << NRF_ESB_PPI_RX_TIMEOUT) |
(1 << NRF_ESB_PPI_TX_START);

m_nrf_esb_mainstate = NRF_ESB_STATE_IDLE;

reset_fifos();

memset(m_rx_pipe_info, 0, sizeof(m_rx_pipe_info));
memset(m_pids, 0, sizeof(m_pids));
NRF_RADIO->SHORTS = RADIO_SHORTS_READY_START_Enabled << RADIO_SHORTS_READY_START_Pos |
RADIO_SHORTS_END_DISABLE_Enabled << RADIO_SHORTS_END_DISABLE_Pos;
NRF_RADIO->TXADDRESS = 0;
NRF_RADIO->RXADDRESSES = 0;
NRF_RADIO->TASKS_RXEN = 0;

return NRF_SUCCESS;
}

RE: dynamic switching ptx and prx base on ESB

Kenneth — Mon, 19 Mar 2018 18:15:31 GMT

Hi, my suggestion is that the PTX periodically send a packet, and that the PRX then can send an ACK or an ACK with payload. Then you avoid switching between PTX and PRX.

The problem with switching is that you don't know if the PTX may still be transmitting waiting for an ACK, if the PRX change to PTX at the same time.