Protocal:ESB
Devices: 1:central(PTX) 2:peripheral(PRX)
Description:
1、Central transmits data to Peripheral,and then Central receives respond data from Peripheral
2、CRC mode：NRF_ESB_CRC_16BIT
tx_mode:NRF_ESB_TXMODE_MANUAL
retransmit_count:0
selective_auto_ack:false
protocal:NRF_ESB_PROTOCOL_ESB_DPL
3、When central get the response of the peripheral,the crc error will occur,the code like this,
static void on_radio_disabled_tx_wait_for_ack()
{
// This marks the completion of a TX_RX sequence (TX with ACK)
nrf_gpio_pin_set(DATA_SENDING_P2);
nrf_gpio_pin_clear(DATA_SENDING_P2);
// Make sure the timer will not deactivate the radio if a packet is received
NRF_PPI->CHENCLR = (1 << NRF_ESB_PPI_TIMER_START) |
(1 << NRF_ESB_PPI_RX_TIMEOUT) |
(1 << NRF_ESB_PPI_TIMER_STOP);
// If the radio has received a packet and the CRC status is OK
if (NRF_RADIO->EVENTS_END && (NRF_RADIO->CRCSTATUS != 0))
{
NRF_ESB_SYS_TIMER->TASKS_SHUTDOWN = 1;
NRF_PPI->CHENCLR = (1 << NRF_ESB_PPI_TX_START);
m_interrupt_flags |= NRF_ESB_INT_TX_SUCCESS_MSK;
m_last_tx_attempts = m_config_local.retransmit_count - m_retransmits_remaining + 1;
(void) nrf_esb_skip_tx();
if (m_config_local.protocol != NRF_ESB_PROTOCOL_ESB && m_rx_payload_buffer[0] > 0)
{
if (rx_fifo_push_rfbuf((uint8_t)NRF_RADIO->TXADDRESS, m_rx_payload_buffer[1] >> 1))
{
m_interrupt_flags |= NRF_ESB_INT_RX_DATA_RECEIVED_MSK;
}
}
if ((m_tx_fifo.count == 0) || (m_config_local.tx_mode == NRF_ESB_TXMODE_MANUAL))
{
m_nrf_esb_mainstate = NRF_ESB_STATE_IDLE;
NVIC_SetPendingIRQ(ESB_EVT_IRQ);
}
else
{
NVIC_SetPendingIRQ(ESB_EVT_IRQ);
start_tx_transaction();
}
}
else
{
if (m_retransmits_remaining-- == 0)
{
NRF_ESB_SYS_TIMER->TASKS_SHUTDOWN = 1;
NRF_PPI->CHENCLR = (1 << NRF_ESB_PPI_TX_START);
// All retransmits are expended, and the TX operation is suspended
m_last_tx_attempts = m_config_local.retransmit_count + 1;
m_interrupt_flags |= NRF_ESB_INT_TX_FAILED_MSK;
m_nrf_esb_mainstate = NRF_ESB_STATE_IDLE;
NVIC_SetPendingIRQ(ESB_EVT_IRQ);
if(NRF_RADIO->CRCSTATUS != 0)
{
nrf_gpio_pin_set(DATA_SENDING_P2);
nrf_gpio_pin_clear(DATA_SENDING_P2);
}
}
else
{
// There are still more retransmits left, TX mode should be
// entered again as soon as the system timer reaches CC[1].
NRF_RADIO->SHORTS = m_radio_shorts_common | RADIO_SHORTS_DISABLED_RXEN_Msk;
update_rf_payload_format(mp_current_payload->length);
NRF_RADIO->PACKETPTR = (uint32_t)m_tx_payload_buffer;
on_radio_disabled = on_radio_disabled_tx;
m_nrf_esb_mainstate = NRF_ESB_STATE_PTX_TX_ACK;
NRF_ESB_SYS_TIMER->TASKS_START = 1;
NRF_PPI->CHENSET = (1 << NRF_ESB_PPI_TX_START);
if (NRF_ESB_SYS_TIMER->EVENTS_COMPARE[1])
{
NRF_RADIO->TASKS_TXEN = 1;
}
}
}
}
when the crc error occur,the indication will be shown like this:
" if(NRF_RADIO->CRCSTATUS != 0)
{
nrf_gpio_pin_set(DATA_SENDING_P2);
nrf_gpio_pin_clear(DATA_SENDING_P2);
}"
4、Is there some way to avoid the CRC error occurred?
Thanks
