SPI questions

Hardware
1

  1. Is it possible to read the pin status of a pin once configured to SPI?
    Example: pin 9 is Spi189 MISO if SPI is configured. In my case I would need to know when MISO goes low - that’s how CC1101 RF chip works (after enable the MISO goes low when the chip is ready). I suppose I could do it with some kind of imp.sleep but if it’s working I would use the normal way how all TI examples are doing it.

  2. Does the dummy write still necessary to read something on SPI?

2

  1. You can configure pin 9 to digital input, the configure it back to SPI after you determine things are ready.

  2. Yes, we’ll update the API docs when this is not necessary any more.

3

1a. In the next release, hardware.pin9.read() will work to obtain the pin state even while it’s still configured as SPI.

Peter

4

@Brown - have you seen my thread on the CC1101?

http://forums.electricimp.com/discussion/168

I never got around to testing out the actual communication. Apparently I misread that when using 915Mhz, you need a special circuit board (I dunno!). Anyway, if you happen to use any of my code, lemme know how well it works for you.

5

I’we seen it, TY for sharing it. It doesn’t works for me since in my solutiom I don’t have the extended pins (GDO0 etc. ) - I simply wait a bit after CS and works that way.

The communication is strange in my case too - i do receive stuff when I do not send anything ( I do trials with two CC1101) and I don’t receive when I shouldn’t. Something is fishy, I ordered now a full devkit from TI and I’ll try with those since those let me control and debug the communication.