1 | // Initialises nRF24L01+ registers with default values and puts it into power down state.
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2 | // Note: this function can also be used to reset the nRF24L01+.
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3 | // Parameters:
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4 | // mode lib_nRF24L01_TXmode | lib_nRF24L01_RXmode
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5 | // groupID the middle byte of the address of the nRF24L01+. This lib uses this byte as common address part of a multiceiver-group.
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6 | // deviceID the LSByte of the address of the nRF24L01+. This lib uses default values from 1...6 for the transmitters of a multiceiver-group.
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7 | // rf_channel RF frequency channel to use: F(RF) = 2400 + x [MHz], where x = 0..125
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8 | void lib_nRF24L01_init_nRF24L01( uint8_t mode, uint8_t groupID, uint8_t deviceID, uint8_t rf_channel)
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9 | {
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10 | // the nRF24L01+ power on reset procedure needs 100ms after operating voltage is supplied
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11 | if ( ! (currentState & STATE_BITMASK_INIT ) )
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12 | _delay_us( nRF24L01_DELAY_POWERON_RESET);
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13 |
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14 | if ( (currentState & STATE_BITMASK_PWR_UP) )
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15 | {
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16 | // flush all data pipes, reset all interrupt flags (IRQ-pin), then go down
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17 | lib_nRF24L01_flush_TX_FIFO();
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18 | lib_nRF24L01_flush_RX_FIFO();
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19 | lib_nRF24L01_clear_IRQ( nRF_REGBITMASK_STATUS_TX_DS);
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20 | lib_nRF24L01_clear_IRQ( nRF_REGBITMASK_STATUS_RX_DR);
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21 | lib_nRF24L01_clear_IRQ( nRF_REGBITMASK_STATUS_MAX_RT);
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22 | lib_nRF24L01_power_down();
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23 | }
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24 |
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25 | // Set RF channel
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26 | lib_nRF24L01_set_regbyte( nRF_REG_RF_CH, rf_channel);
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27 | // Set data speed & Output Power as preconfigured in lib_nRF24L01_RF_SETUP (set in lib_nRF24L01.h)
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28 | lib_nRF24L01_set_regbyte( nRF_REG_RF_SETUP, lib_nRF24L01_RF_SETUP);
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29 |
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30 | // Set Device Address Width
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31 | lib_nRF24L01_set_regbyte( nRF_REG_SETUP_AW, nRF_REGBITVAL_SETUP_AW_3BYTES);
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32 |
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33 | // Set device addresses for a "multiceiver group" (a star topology consisting of 1 receiver and up to 6 transmitters) with auto acknowledge
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34 | if ( mode == lib_nRF24L01_TXmode )
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35 | {
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36 | // Set Device Address (which identifies the transmitter)
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37 | lib_nRF24L01_set_tx_addr( groupID, deviceID);
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38 | // Enable only RX data pipe 0 for receiving data (to receive acknowledge-packets from a listening receiver)
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39 | lib_nRF24L01_set_regbyte( nRF_REG_EN_RXADDR, nRF_REGBITMASK_EN_RXADDR_ERX_P0);
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40 | // addresses to listen to
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41 | lib_nRF24L01_set_rx_addr( 0, groupID, deviceID); // Note: when using auto acknowledgement, RX pipe 0 of a nRF24L01+ in TX-mode has to be set to the own device address
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42 | // just for tidiness: write unused (§ thats just my personal convention!) addresses to all unsed data pipes
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43 | lib_nRF24L01_set_rx_addr( 1, 0xFF, 0xFF);
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44 | lib_nRF24L01_set_rx_addr( 2, 0xFF, 0xFF);
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45 | lib_nRF24L01_set_rx_addr( 3, 0xFF, 0xFF);
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46 | lib_nRF24L01_set_rx_addr( 4, 0xFF, 0xFF);
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47 | lib_nRF24L01_set_rx_addr( 5, 0xFF, 0xFF);
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48 | }
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49 | else // i.e. mode == lib_nRF24L01_RXmode (multiceiver)
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50 | {
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51 | // In order to avoid address conflicts which could occur when the PRX is switched to TX mode on the fly,
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52 | // the Device Address is set even in RX-mode
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53 | lib_nRF24L01_set_tx_addr( groupID, deviceID > 6 ? deviceID : 0); // ensure the deviceID does not collide with one of the transmitters of the same group
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54 | // Enable all RX data pipe addresses for receiving data
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55 | lib_nRF24L01_set_regbyte( nRF_REG_EN_RXADDR, nRF_REGBITMASK_EN_RXADDR_ERX_ALL);
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56 | // addresses to listen to
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57 | lib_nRF24L01_set_rx_addr( 0, groupID, 1);
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58 | lib_nRF24L01_set_rx_addr( 1, groupID, 2);
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59 | lib_nRF24L01_set_rx_addr( 2, groupID, 3);
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60 | lib_nRF24L01_set_rx_addr( 3, groupID, 4);
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61 | lib_nRF24L01_set_rx_addr( 4, groupID, 5);
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62 | lib_nRF24L01_set_rx_addr( 5, groupID, 6);
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63 | }
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64 |
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65 | // Enable the nice "Enhanced ShockBurst" features:
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66 | // ... Automatic Retransmission
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67 | // Note 1: use nRF_REG_SETUP_RETR ARD setting faster than 500us with caution: read note (d) at the end of the Register Map Table (page 60 of manual)!
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68 | // Note 2: § in order to avoid repeated transmission collisions, ensure different values for each device working on the same RF-channel
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69 | if ( mode == lib_nRF24L01_TXmode )
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70 | {
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71 | uint8_t delay = (0x10 * (1+deviceID)) & nRF_REGBITMASK_SETUP_RETR_ARD; // see nRF_REGVAL_SETUP_RETR_ARD_*-constants
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72 | lib_nRF24L01_set_regbyte( nRF_REG_SETUP_RETR, (delay | nRF_REGVAL_SETUP_RETR_ARC_15) );
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73 | }
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74 | else
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75 | {
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76 | lib_nRF24L01_set_regbyte( nRF_REG_SETUP_RETR, (nRF_REGVAL_SETUP_RETR_ARD_500 | nRF_REGVAL_SETUP_RETR_ARC_15) );
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77 | }
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78 | // ... Dynamic Payload Length as well as Automatic Acknowledgement Payloads
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79 | lib_nRF24L01_set_regbyte( nRF_REG_FEATURE, nRF_REGBITMASK_FEATURE_EN_DPL // enables Dynamic Payload Length
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80 | | nRF_REGBITMASK_FEATURE_EN_DYN_ACK // enables use of nRF_CMD_W_TX_PAYLOAD_NOACK command
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81 | | nRF_REGBITMASK_FEATURE_EN_ACK_PAY // enables "Acknowledge Payloads"
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82 | );
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83 | // ... enable Automatic Acknowledgement for all data pipes
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84 | lib_nRF24L01_set_regbyte( nRF_REG_EN_AA, nRF_REGBITMASK_EN_AA_ENAA_ALL);
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85 | // ... enable Dynamic Payload Length for all data pipes
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86 | lib_nRF24L01_set_regbyte( nRF_REG_DYNPD, nRF_REGBITMASK_DYNPD_ALL);
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87 |
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88 | currentState = STATE_BITMASK_INIT; // initialised, powered down
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89 | }
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