由上图可得出以下结论：发送端：每当发送一个新的数据包，PID值就会加1

The following conclusions can be drawn from the above figure: <br>Sending end: Every time a new data packet is sent, the PID value will increase by 1. <br>Receiving end: For the receiving end, the PID value of the newly received data packet is compared with the PID value of the last received data packet. If the two PID values ​​are different, the data packet is regarded as a new data packet and the system Receive. If the two PID values ​​are different, then compare the two cyclic redundancy codes CRC, if the two are the same, it is considered that the old data packet is directly discarded. If the cyclic redundancy code CRC is different, it is regarded as a new data packet and the system receives it. <br>(5) Carrier detection <br>When using the enhanced ShockBurstTM mode for packet processing, carrier detection will play a very important role. In the process of packet transmission, if the packet loss rate increases, then we will detect the CD value of the transmission channel at the receiving end. When the CD value is high, it indicates that this channel transmits too much data and congestion occurs At this time, the way we take is to change the transmission channel. When the CD value is low, this channel can carry out normal data transmission. <br>(6) Data channel <br>When the nRF24L01 wireless communication module is set to receive mode, the receiver can simultaneously receive data with six channels, different addresses, and the same rate. For the data channel, it is set by the register EN_RXADDR. In general, only channel 0 and channel 1 are turned on. In addition, these data channels are given different addresses through the register RX_ADDR_Px (the value of x is 0 to 5, where the addresses of RX_ADDR_P0 and RX_ADDR_P1 are 40 bits, and the addresses of RX_ADDR_P2 to RX_ADDR_P5 are 32-bit common addresses plus the respective adjusted Lower 8-bit address)

The figure above leads to the following conclusions:<br>Sender: Whenever a new packet is sent, the PID value is added by 1.<br>Receiver: For the receiving end, the newly received packet PID value is compared to the PID value of the last received packet, and if the two PID values are different, the packet is considered to be the new packet and the system receives it. If the two PID values are different, and then the two cycle redundant code CRC is compared, if the two are the same, the old packet is considered to be dropped directly. If the cycle redundant code CRC is different, it is considered a new packet and is received by the system.<br>(5) Carrier detection<br>Carrier detection plays an important role in packet processing using the enhanced ShockBurstTM mode. In the packet transmission process, if the packet loss rate increases, then we are at the receiving end of the transmission channel CD value detection, when the CD value is high, indicating that this channel transmission data too much, congestion phenomenon, then we take the approach is to change the transmission channel. When the CD value is low, this channel can be transmitted normally.<br>(6) Data Channel<br> When the nRF24L01 wireless communication module is set to receive mode, the receiving end can simultaneously receive data with different channels, different addresses and the same rate. For a data channel, it is set by register EN_RXADDR, and in general, only channel 0 and channel 1 are open. In addition, these data channels are given different addresses through register RX_ADDR_Px (x is valued from 0 to 5, where the RX_ADDR_P0 and RX_ADDR_P1 addresses are 40 bits, and the addresses from RX_ADDR_P2 to RX_ADDR_P5 are 32-bit common addresses plus their respective adjusted low 8-bit addresses)

From the above figure, the following conclusions can be drawn:<br>Sender: every time a new packet is sent, the PID value will be increased by 1.<br>Receiver: for the receiver, compare the PID value of the newly received data packet with the PID value of the last received data packet. If the two PID values are different, the data packet is considered as a new data packet, and the system receives it. If the two PID values are different, then compare the two cyclic redundancy codes CRC. If the two are the same, it is considered that the old packets are discarded directly. If the CRC of cyclic redundancy code is different, it is considered as a new packet, which is received by the system.<br>(5) Carrier detection<br>When the enhanced ShockBurst TM mode is used for packet processing, carrier detection will play an important role. In the process of packet transmission, if the packet loss rate increases, then we will detect the CD value of the transmission channel at the receiving end. When the CD value is high, it indicates that there is too much data transmission and congestion in this channel. At this time, we will change the transmission channel. When the CD value is low, it indicates that this channel can carry out normal data transmission.<br>(6) Data channel<br>When nRF24L01 wireless communication module is set to receive mode, the receiver can receive data with different six channels, different addresses and the same rate at the same time. For data channels, it is set by the register en? Rxaddr. Generally, only channel 0 and channel 1 are on. In addition, these data channels are given different addresses by register Rx ﹣ addr ﹣ PX (the value of X is 0 to 5, where the addresses of Rx ﹣ addr ﹣ P0 and Rx ﹣ addr ﹣ P1 are 40 bits, the addresses of Rx ﹣ addr ﹣ P2 to Rx ﹣ addr ﹣ P5 are 32-bit common addresses plus the lower 8-bit addresses adjusted respectively)