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SPI mode change

 
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GusA



Joined: 28 Mar 2020
Posts: 5
Location: York, PA

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SPI mode change
PostPosted: Tue Mar 30, 2021 1:43 pm     Reply with quote

I am working with a PIC18F67K22 microcontroller, using the PCWH compiler ver 5.093.
I have a working SPI bus configured as follows:

#use spi (MASTER, SPI1, BAUD=500000, MODE=0, BITS=8, STREAM=SPI_1)

The bus is operational with all spi devices except for one that requires the MODE=1 (IDLE=0 and SAMPLE_FALL). I have not found a library function that can change modes within the program (when communicating with the particular device).

Is there any way, besides using assembly (#asm.....#endasm)?

Thanks!
GusA



Joined: 28 Mar 2020
Posts: 5
Location: York, PA

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PostPosted: Tue Mar 30, 2021 2:29 pm     Reply with quote

CCS technical support replied as follows, which BTW I tried and worked fine:

You can do this:

#use spi (MASTER, SPI1, BAUD=100000, MODE=0, BITS=8, STREAM=SPI_1A) #use spi (MASTER, SPI1, BAUD=100000, MODE=1, BITS=8, STREAM=SPI_1B)

Call spi_init() to change the mode and always use the right stream ID for the SPI calls.
Ttelmah



Joined: 11 Mar 2010
Posts: 19195

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PostPosted: Tue Mar 30, 2021 11:31 pm     Reply with quote

Yes, this has been answered here before. Using two (or more) streams. Very Happy
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