nrf24l01 NRF2401 How to set the CRC function without chip

All the configuration work of the NRF2401 is done through the three pins of CS, CLK1 and Data, and it requires a 15-byte configuration word to configure it in ShockburstTM transceiver mode, while only a 2-byte configuration word is required to configure it to direct transceiver mode. From the above introduction of the working mode of the NRF2401, we can know that the NRF2401 generally works in the ShockburstTM transceiver mode, so that the programming of the system will be simpler, and the stability will be higher, therefore, the following focuses on the device configuration method of configuring the NRF2401 as the ShockburstTM transceiver mode.

The configuration word of the shockburstTM enables the NRF2401 to handle the RF protocol, and after the configuration is complete, only the contents of the NRF2401 need to be changed by the lowest byte during its operation to switch between receive and transmit modes. The configuration word of shockburstTM can be divided into the following four parts:

Data Width: Declares the number of bits occupied by data in an RF packet. This enables the NRF2401 to distinguish between data in received packets and CRC checksums;

CRC: Enables the NRF2401 to generate CRC checksum codes and decoding.

When using the NRF2401's on-chip CRC technology, make sure that CRC checksum is enabled in the configuration word and that the same protocol is used for sending and receiving.

In configuration mode, make sure that the PWR up pin is high and the CE pin is low. The configuration word starts at the highest digit and feeds into the nrf2401 in turn. On the falling edge of the CS pin, the newly fed configuration word starts working.

PCB design.

PCB design has a great impact on the overall performance of NRF2401, so PCB design is one of the main tasks in the development process of NRF2401 transceiver system.

The PCB of NRF2401 is generally a double-layer board, the bottom layer generally does not place components, it is a stratum, and the spare space of the top layer is generally coated with copper, which is connected to the ground at the bottom layer through vias. The DC power supply and the power supply filter capacitor are as close as possible to the VDD pin. The power supply of the NRF2401 should be separated by capacitors, which is conducive to providing a stable power supply to the NRF2401.

In the PCB, try to make as many through holes as possible so that the top and bottom floors can be fully contacted.

NRF2401 uses the ShockburstTM transceiver mode for wireless data transmission, reliable transceiving, small dimensions, and fewer peripheral components, therefore, it is easy to use and has broad application prospects in various fields such as industrial control and consumer electronics.

The NRF2401 has built-in address decoders, first-in, first-out stack areas, demodulation processors, clock processors, GFSK filters, low-noise amplifiers, frequency synthesizers, power amplifiers and other functional modules, which require few peripheral components, so it is very convenient to use. The QFN is available in a 24-pin package with a form factor of only 5 5mm.