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New protocol decoder: nrf24l01

libsigrokdecode has gained support for a new protocol decoder recently, the nrf24l01 PD.

Thanks a lot to Jens Steinhauser for contributing the decoder, as well as a bunch of test files that we're using for some automated decoder tests (and that you can use to easily try out the decoder as well).

This decoder stacks on top of the SPI PD, decoding some higher-level commands used by the Nordic Semiconductor nRF24L01(+) 2.4GHz RF transceiver ICs.

A short description of the chip and its protocol and pins is available on the respective wiki page, along with pointers to further reading.