drivers/radio/nrf24l01: Optimized status reading. #955
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The value of the STATUS register is always transmitted by the chip when reading any command. So a R_REGISTER command and the turnaround time can be spared by issuing a NOP command instead. This implementation suggested by the datasheet. This operation is compatible with both nRF24L01 and nRF24L01+. Signed-off-by: Marcell Pünkösd <[email protected]>
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The value of the STATUS register is always transmitted by the chip when reading any command. So a R_REGISTER command and the turnaround time can be spared by issuing a NOP command instead.
This implementation suggested by the datasheet.
This operation is compatible with both nRF24L01 and nRF24L01+.
In my testing, this reduced the STATUS read time from 41 μs to 27 μs. This allows for quicker polling, and thus more responsive operation.
Old behavior:
New behavior: