uint8_t rf_dngl_recv(__xdata void* buff, uint8_t buff_size)
{
uint8_t ret_val = 0;
// check if there's data in the RX FIFO
nRF_ReadReg(FIFO_STATUS);
if ((nRF_data[1] & vRX_EMPTY) == 0)
{
LED_on();
// read the payload
nRF_ReadRxPayloadWidth();
ret_val = nRF_data[1];
// the nRF specs state I have to drop the packet if the length is > 32
if (ret_val > 32)
{
nRF_FlushRX();
ret_val = 0;
} else {
nRF_ReadRxPayload(ret_val);
memcpy_X(buff, nRF_data + 1, ret_val > buff_size ? buff_size : ret_val);
}
// reset the TX_DS
if (nRF_data[0] & vTX_DS)
nRF_WriteReg(STATUS, vTX_DS);
LED_off();
}
return ret_val;
}
uint8_t rf_ctrl_read_ack_payload(void* buff, const uint8_t buff_size)
{
uint8_t ret_val = 0;
nRF_ReadReg(FIFO_STATUS);
uint8_t fifo_status = nRF_data[1];
if ((fifo_status & vRX_EMPTY) == 0)
{
nRF_ReadRxPayloadWidth();
uint8_t ack_bytes = nRF_data[1];
// the max ACK payload size has to be 2
if (ack_bytes <= 32)
{
// read the entire payload
nRF_ReadRxPayload(ack_bytes);
// copy up to buff_size bytes
ret_val = ack_bytes < buff_size ? ack_bytes : buff_size;
memcpy(buff, nRF_data + 1, ret_val);
} else {
nRF_FlushRX();
}
}
return ret_val;
}
void rf_ctrl_init(void)
{
nRF_Init();
// write the addresses
nRF_WriteAddrReg(TX_ADDR, DongleAddr, 5);
// we need to set the RX address to the same as TX to be
// able to receive ACK
nRF_WriteAddrReg(RX_ADDR_P0, DongleAddr, 5);
#ifdef NRF_CHECK_MODULE
nRF_data[1] = 0;
nRF_data[2] = 0;
nRF_data[3] = 0;
nRF_data[4] = 0;
nRF_data[5] = 0;
nRF_ReadAddrReg(TX_ADDR, 5); // read the address back
// compare
if (memcmp_P(nRF_data + 1, &DongleAddr, 5) != 0)
{
//printf("buff=%02x %02x %02x %02x %02x\n", buff[0], buff[1], buff[2], buff[3], buff[4]);
//printf("nRF_=%02x %02x %02x %02x %02x\n", nRF_data[1], nRF_data[2], nRF_data[3], nRF_data[4], nRF_data[5]);
// toggle the CAPS LED forever
//uint8_t c;
//for (c = 0; c < 10; ++c)
for (;;)
{
TogBit(PORT(LED_CAPS_PORT), LED_CAPS_BIT);
_delay_ms(300);
}
}
#endif // NRF_CHECK_MODULE
nRF_WriteReg(EN_AA, vENAA_P0); // enable auto acknowledge
nRF_WriteReg(EN_RXADDR, vERX_P0); // enable RX address (for ACK)
nRF_WriteReg(SETUP_RETR, vARD_250us // auto retransmit delay - ARD
| 0x0f); // auto retransmit count - ARC
nRF_WriteReg(FEATURE, vEN_DPL | vEN_ACK_PAY); // enable dynamic payload length and ACK payload
nRF_WriteReg(DYNPD, vDPL_P0); // enable dynamic payload length for pipe 0
nRF_FlushRX();
nRF_FlushTX();
nRF_WriteReg(STATUS, vRX_DR | vTX_DS | vMAX_RT); // reset the IRQ flags
nRF_WriteReg(RF_CH, CHANNEL_NUM); // set the channel
// reset the the lost packet counters
plos_total = arc_total = rf_packets_total = 0;
}
void rf_dngl_init(void)
{
nRF_Init();
// set the addresses
nRF_WriteAddrReg(RX_ADDR_P0, DongleAddr, NRF_ADDR_SIZE);
#if defined(NRF_CHECK_MODULE) && defined(AVR)
nRF_data[1] = 0;
nRF_data[2] = 0;
nRF_data[3] = 0;
nRF_data[4] = 0;
nRF_data[5] = 0;
nRF_ReadAddrReg(RX_ADDR_P0, 5); // read the address back
// compare
if (memcmp(nRF_data + 1, &DongleAddr, NRF_ADDR_SIZE) != 0)
{
//printf("buff=%02x %02x %02x %02x %02x\n", buff[0], buff[1], buff[2], buff[3], buff[4]);
//printf("nRF_=%02x %02x %02x %02x %02x\n", nRF_data[1], nRF_data[2], nRF_data[3], nRF_data[4], nRF_data[5]);
// toggle the LED forever
for (;;)
{
TogBit(PORT(LED1_PORT), LED1_BIT);
_delay_ms(300);
}
}
#endif // NRF_CHECK_MODULE
nRF_WriteReg(EN_AA, vENAA_P0); // enable auto acknowledge
nRF_WriteReg(SETUP_RETR, vARD_250us); // ARD=250us, ARC=disabled
nRF_WriteReg(RF_SETUP, vRF_DR_2MBPS // data rate
| vRF_PWR_0DBM); // output power
nRF_WriteReg(FEATURE, vEN_DPL | vEN_ACK_PAY); // enable dynamic payload length and ACK payload
nRF_WriteReg(DYNPD, vDPL_P0); // enable dynamic payload length for pipe 0
nRF_FlushRX();
nRF_FlushTX();
nRF_WriteReg(EN_RXADDR, vERX_P0); // enable RX address
nRF_WriteReg(STATUS, vRX_DR | vTX_DS | vMAX_RT); // reset the IRQ flags
nRF_WriteReg(RF_CH, CHANNEL_NUM); // set the channel
nRF_WriteReg(CONFIG, vEN_CRC | vCRCO // enable a 2 byte CRC
| vMASK_TX_DS // we don't care about the TX_DS status flag
| vPRIM_RX // RX mode
| vPWR_UP); // power up the transceiver
nRF_CE_hi(); // start receiving
}
