[Oberon] FPGA - nRF24L01 `RPI Net' server

Jörg joerg.straube at iaeth.ch
Wed May 2 22:15:11 CEST 2018

Silly enough, my first change in the code was to rename netSelet and netEnable...

> Am 02.05.2018 um 21:36 schrieb Paul Reed <paulreed at paddedcell.com>:
> Hi Tomas,
>> Looking into `PI' low level `SPI' code, chip is controlled by `CE' and
>> `CSN' pins. Reading `SCC.Mod' and `SPI.v' code I do not see these
>> signals used, possible?
> Not possible - the radio in the chip does not listen/transmit when CE is
> not used, and doesn't receive commands if CSN is not used.
> But because of possible confusion between CE (radio enable) and CSN (SPI
> slave select) I called the former NEN (network enable) and the latter SS
> in hardware.
> They are SPI control register bits 3 and 1 respectively; see SCC.Mod, bits
> netEnable and netSelect, respectively. netSelect is inverted by the
> hardware, so writing a 1 to the control port activates the signal (sends
> it low) - this does not apply to netEnable.
> By the way, notice from the datasheet that you can't write to the nRF
> registers when the radio is on.
> Paul
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