SS=subsystem -> chapter 25 Am Montag, 20. Januar 2020 07:12:34 UTC+1 schrieb Andrew P. Lentvorski: > > Okay, then I'm just missing something obvious. What is a GPIO-SS? What > unit and what register address? I see no mention of "GPIO-SS" anywhere in > the AM335x Technical Reference Manual. > > Normally, I associate SS with "slave select" which means SPI. I see that > you *can* turn around the CS lines on the McSPI subsystem, but you have to > switch from Master to Slave Mode. That doesn't seem like what you are > suggesting. > > On Sunday, January 19, 2020 at 12:38:28 AM UTC-8, TJF wrote: >> >> >> It was your idea to use the PRU-IEP module. I recommended to use a pin on >> a GPIO-SS. >> > > I went hunting for GPIO-SS--I didn't find anything. I went hunting for OE > (output enable) in the PRU docs. I found one on the digio. I also found > that TI used the IEP to implement the 1-Wire interface on the PRUCAPE. You > were also implementing bidirectionality on a 1-Wire interface. I drew an, > incorrect in retrospect, inference that people were using the IEP digio for > bidirectional and tri-state functions. >
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