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No SPI DO pin on PIC16LF15325 [Solved]

 
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colin382



Joined: 03 Jun 2020
Posts: 25
Location: UK

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No SPI DO pin on PIC16LF15325 [Solved]
PostPosted: Mon May 09, 2022 7:36 am     Reply with quote

Attempting to set up an SPI facility on 16LF15325 using statement
#use spi(MASTER, DI = PIN_C0, DO = PIN_C1, CLK = PIN_C2, FORCE_SW, BITS = 8)

followed by: spi_xfer(0xF8);

I note that DO in #use spi() is printed in blue, the rest of the characters are in black. Why is this? There is no variable named DO.

The code compiles and I see eight clock pulses on the correct pin but nothing on the DO pin, or any other pin.
The clock rate is quite slow, about 100KHz on a 1MHz internal clock so I think it is using software as intended.

The device data sheet does not have an explicit assignment for SPI data out, but by using FORCE_SW I expected to get round this limitation.

Should I write my own SPI function, the CCS compiler normally would do a better job.
colin382



Joined: 03 Jun 2020
Posts: 25
Location: UK

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PostPosted: Mon May 09, 2022 7:50 am     Reply with quote

SOLVED
A previous SPI setup had not been deleted.
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