当nRF24L01无线通信模块发送数据时，起初应该把nRF24L01设

When the nRF24L01 wireless communication module sends data, the nRF24L01 should be set to the transmission mode at first, and then connect the nRF24L01 wireless communication module to the STC89C51 microcontroller through the serial peripheral interface SPI, and then the receiving node address TX_ADDR and valid data TX_PLD according to the order It is sequentially input into the memory of the nRF24L01 wireless communication module. In this process, it only needs to input the receiving node address TX_ADDR once, and valid data TX_PLD must be continuously input when the condition of CSN is high. Next set the CE pin to high level and maintain it for more than 10μs, and finally send the data after 130μs. If the receiver of the nRF24L01 wireless communication module has turned on the automatic response mode, then after the data is sent, it waits for the response of the signal from the receiver, and judges the accuracy of the information through the feedback data of the receiver. If the feedback address is consistent with the sent address, Then the data transmission is successful. At this time, set TX_DS to high level and delete the data in the TX_FIFO register: but if the address fed back by the receiver does not match the address sent, the data in the TX_FIFO register is retained at this time, and the sender passes The automatic retransmission function sends data until the data transmission is successful or the number of retransmissions ARC is greater than the set value; if the number of transmissions is greater than the set value, then set MAX_RT or TX_DS to high level and interrupt Request IRQ to be set to low level, inform the MCU through the data interface, and then the micro control unit will process until the data transmission is successful []. Then after successful communication between the sender and the receiver, if there is data to be sent, the system enters the normal transceiver mode, and if there is no data to be sent, the system enters the idle mode. As shown in Figure 3-9 below is the timing diagram of nRF24L01 sending data:

When the nRF24L01 wireless communication module sends data, the nRF24L01 should be set to the transmit mode at first, and then the nRF24L01 wireless communication module is connected to the STC89C51 microcontroller through the serial peripheral interface SPI, and then the receiving node address TX_ADDR and valid data TX_PLD entered into the nRF24L01 wireless communication module in sequence, in this process, the receiving address TX_ The ADDR only needs to be entered once, while for valid dataTX_PLD must be entered continuously when the CSN is high. The CE pin is then set to high and maintained above 10 s, and the data is sent after 130?s. If the receiving end of the nRF24L01 wireless communication module turns on the automatic answer mode, then the data is sent and waits for the response of the receiving signal, the accuracy of the information is judged by the feedback data of the receiving end, if the address of the feedback is consistent with the address sent, the data transmission is successful, then the TX_DS is set to a high level and delete the data in the TX_FIFO register: but if the address of the receiving feed does not match the address sent, the TX_ is retained at this time Data in the FIFO register, the sender sends the data through the automatic retransmission function until the data transmission is successful or the number of reissues ARC is greater than the set value, then the MAX_RT or TX_DS is then set to a high level, the interrupt request IRQ is set to a low level, the microcontrol unit MCU is informed through the data interface, and then the microcontrol unit is processed until the data transmission is successful. Then after the successful communication of the sender and receiver, if there is data to be sent, then the system goes into normal send and receive mode, and if no data needs to be sent, then the system goes into idle mode. The time series of data sent by nRF24L01 is shown in Figure 3-9 below:

When nRF24L01 wireless communication module sends data, nRF24L01 should be set as the transmitting mode at first, then nRF24L01 wireless communication module is connected with STC89C51 single chip microcomputer through SPI, and then the receiving node address TX ﹣ addr and effective data TX ﹣ PLD are input to the memory of nRF24L01 wireless communication module in sequence. In this process, for The receiving node address TX ﹣ addr only needs to be input once, while the valid data TX ﹣ PLD must be input continuously when the CSN is high. Next, set the CE pin to high level and maintain above 10 μ s, and finally send the data after 130 μ s. If the receiving end of nRF24L01 wireless communication module turns on the automatic response mode, the data will wait for the signal response of the receiving end after transmission, and judge the accuracy of the information through the feedback data of the receiving end. If the feedback address is consistent with the transmitted address, then the data transmission is successful. At this time, set TX ﹤ DS as the high level and delete the data in TX ﹤ FIFO register: However, if the address fed back by the receiver does not match the address sent, the data in the TX FIFO register shall be reserved at this time, and the sender shall send the data through the automatic retransmission function until the data transmission is successful or the number of retransmissions arc is greater than the set value; if the number of transmissions is greater than the set value, then the max? RT or TX? DS shall be set to the high level, and the interrupt request IRQ shall be set Set to low level, inform MCU through data interface, and then process by MCU until data transmission is successful []. After the successful communication between the sender and the receiver, if there is still data to be sent, the system will enter the normal receiving and sending mode. If there is no data to be sent, the system will enter the idle mode. As shown in Figure 3-9 below is the sequence diagram of nRF24L01 transmitting data:<br>