static void writeBindAckPayload(uint8_t *payload)
{
#ifdef USE_AUTO_ACKKNOWLEDGEMENT
memcpy(ackPayload, payload, BIND_PAYLOAD_SIZE);
// send back the payload with the first two bytes set to zero as the ack
ackPayload[0] = BIND_ACK_PAYLOAD0;
ackPayload[1] = BIND_ACK_PAYLOAD1;
// respond to request for rfChannelCount;
ackPayload[7] = inavRfChannelHoppingCount;
// respond to request for payloadSize
switch (payloadSize) {
case INAV_PROTOCOL_PAYLOAD_SIZE_MIN:
case INAV_PROTOCOL_PAYLOAD_SIZE_DEFAULT:
case INAV_PROTOCOL_PAYLOAD_SIZE_MAX:
ackPayload[8] = payloadSize;
break;
default:
ackPayload[8] = INAV_PROTOCOL_PAYLOAD_SIZE_DEFAULT;
break;
}
writeAckPayload(ackPayload, BIND_PAYLOAD_SIZE);
#else
UNUSED(payload);
#endif
}
static void inavNrf24Setup(rx_spi_protocol_e protocol, const uint32_t *rxSpiId, int rfChannelHoppingCount)
{
UNUSED(protocol);
UNUSED(rfChannelHoppingCount);
// sets PWR_UP, EN_CRC, CRCO - 2 byte CRC, only get IRQ pin interrupt on RX_DR
NRF24L01_Initialize(BV(NRF24L01_00_CONFIG_EN_CRC) | BV(NRF24L01_00_CONFIG_CRCO) | BV(NRF24L01_00_CONFIG_MASK_MAX_RT) | BV(NRF24L01_00_CONFIG_MASK_TX_DS));
#ifdef USE_AUTO_ACKKNOWLEDGEMENT
NRF24L01_WriteReg(NRF24L01_01_EN_AA, BV(NRF24L01_01_EN_AA_ENAA_P0)); // auto acknowledgment on P0
NRF24L01_WriteReg(NRF24L01_02_EN_RXADDR, BV(NRF24L01_02_EN_RXADDR_ERX_P0));
NRF24L01_WriteReg(NRF24L01_03_SETUP_AW, NRF24L01_03_SETUP_AW_5BYTES); // 5-byte RX/TX address
NRF24L01_WriteReg(NRF24L01_04_SETUP_RETR, 0);
NRF24L01_Activate(0x73); // activate R_RX_PL_WID, W_ACK_PAYLOAD, and W_TX_PAYLOAD_NOACK registers
NRF24L01_WriteReg(NRF24L01_1D_FEATURE, BV(NRF24L01_1D_FEATURE_EN_ACK_PAY) | BV(NRF24L01_1D_FEATURE_EN_DPL));
NRF24L01_WriteReg(NRF24L01_1C_DYNPD, BV(NRF24L01_1C_DYNPD_DPL_P0)); // enable dynamic payload length on P0
//NRF24L01_Activate(0x73); // deactivate R_RX_PL_WID, W_ACK_PAYLOAD, and W_TX_PAYLOAD_NOACK registers
NRF24L01_WriteRegisterMulti(NRF24L01_10_TX_ADDR, rxTxAddr, RX_TX_ADDR_LEN);
#else
NRF24L01_SetupBasic();
#endif
NRF24L01_WriteReg(NRF24L01_06_RF_SETUP, NRF24L01_06_RF_SETUP_RF_DR_250Kbps | NRF24L01_06_RF_SETUP_RF_PWR_n12dbm);
// RX_ADDR for pipes P1-P5 are left at default values
NRF24L01_WriteRegisterMulti(NRF24L01_0A_RX_ADDR_P0, rxTxAddr, RX_TX_ADDR_LEN);
NRF24L01_WriteReg(NRF24L01_11_RX_PW_P0, payloadSize);
#ifdef USE_BIND_ADDRESS_FOR_DATA_STATE
inavSetBound();
UNUSED(rxSpiId);
#else
rxSpiId = NULL; // !!TODO remove this once configurator supports setting rx_id
if (rxSpiId == NULL || *rxSpiId == 0) {
rxSpiIdPtr = NULL;
protocolState = STATE_BIND;
inavRfChannelCount = 1;
inavRfChannelIndex = 0;
NRF24L01_SetChannel(INAV_RF_BIND_CHANNEL);
} else {
rxSpiIdPtr = (uint32_t*)rxSpiId;
// use the rxTxAddr provided and go straight into DATA_STATE
memcpy(rxTxAddr, rxSpiId, sizeof(uint32_t));
rxTxAddr[4] = RX_TX_ADDR_4;
inavSetBound();
}
#endif
NRF24L01_SetRxMode(); // enter receive mode to start listening for packets
// put a null packet in the transmit buffer to be sent as ACK on first receive
writeAckPayload(ackPayload, payloadSize);
}
static void writeTelemetryAckPayload(void)
{
#ifdef TELEMETRY_NRF24_LTM
// set up telemetry data, send back telemetry data in the ACK packet
static uint8_t sequenceNumber = 0;
static ltm_frame_e ltmFrameType = LTM_FRAME_START;
ackPayload[0] = sequenceNumber++;
const int ackPayloadSize = getLtmFrame(&ackPayload[1], ltmFrameType) + 1;
++ltmFrameType;
if (ltmFrameType > LTM_FRAME_COUNT) {
ltmFrameType = LTM_FRAME_START;
}
writeAckPayload(ackPayload, ackPayloadSize);
#ifdef DEBUG_NRF24_INAV
debug[1] = ackPayload[0]; // sequenceNumber
debug[2] = ackPayload[1]; // frame type, 'A', 'S' etc
debug[3] = ackPayload[2]; // pitch for AFrame
#endif
#endif
}
