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spi_xfer_in usage on PIC16F15325

 
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Momboz



Joined: 03 Jun 2009
Posts: 29

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spi_xfer_in usage on PIC16F15325
PostPosted: Sun Dec 22, 2019 5:20 am     Reply with quote
I would like to use the function spi_xfer_in for reading an external signal with its clock and the compilation says:
"*** Error 51 "CCS_15325_Micro.c" Line 23(27,28): A numeric expression must appear here"

Here is my code:
Code:
#include <CCS_15325_Micro.h>
#define LED PIN_A0
#define DELAY 10

#use spi (SLAVE, CLK=PIN_C0, DI=PIN_C1, MODE=0, BITS=24, STREAM=SPI_1)

unsigned long data_in;

#INT_EXT
void  EXT_isr(void) {
  output_toggle(PIN_A1);
}

void main() {
  enable_interrupts(INT_EXT);
  enable_interrupts(GLOBAL);
 
  while(TRUE) {
    //Example blinking LED program
    output_toggle(LED);
    delay_ms(DELAY);
    //TODO: User Code
    data_in = spi_xfer_in();
  }
}


and the external signal is a clock with a BCD over 6 nibbles as shown in here:
https://www.yuriystoys.com/2013/07/chinese-caliper-data-format.html

Any help or advice?
Ttelmah



Joined: 11 Mar 2010
Posts: 19499

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PostPosted: Sun Dec 22, 2019 5:41 am     Reply with quote
All spi_xfer functions need the stream name....
They say they don't, but there are issues unless you use it.

What PIC are you using?.

If the C0/C1 pins are SPI2, then use 'SPI2'. You can't setup a hardware
SPI, without using all three pins. You can override the unused pin after
it is setup, but using only two pins will setup a software SPI, and this
will not support slave operation....
Momboz



Joined: 03 Jun 2009
Posts: 29

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spi_xfer_in usage on PIC16F15325
PostPosted: Mon Dec 23, 2019 5:34 am     Reply with quote
Ttelmah wrote:
All spi_xfer functions need the stream name....
They say they don't, but there are issues unless you use it.


Ok. I assume that would mean "data_in = spi_xfer_in(SPI_1,24); in my case"

Quote:

What PIC are you using?.
It's a PIC16F15325

Quote:

If the C0/C1 pins are SPI2, then use 'SPI2'. You can't setup a hardware
SPI, without using all three pins. You can override the unused pin after
it is setup, but using only two pins will setup a software SPI, and this
will not support slave operation....

In my case C0/C1 is SPI1 according to the Microchip datasheet.
Your statement is that I could use the hardware SPI in slave mode(since slave mode is not allowed in software SPI). That means my code will look like this:
Code:
...
#use spi(FORCE_HW, SLAVE, BITS=24, stream=SPI_STREAM)
...
data_in = spi_xfer_in(SPI_STREAM,24);
...


Te compiler still gives error during compilation:
"*** Error 99 "CCS_15325_Micro.c" Line 6(5,54): Option invalid Wrong pins for H/W"

Any advice? Thank you.
temtronic



Joined: 01 Jul 2010
Posts: 9221
Location: Greensville,Ontario

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PostPosted: Mon Dec 23, 2019 6:00 am     Reply with quote
I don't use that PIC but downloaded the datasheet..

That PIC has PPS which probably has to be configured BEFORE you use SPI.

There's a 'Sticky' at the top of this page which should help.
Others who use this PIC , or one with PPS, may reply with help.
jeremiah



Joined: 20 Jul 2010
Posts: 1345

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Re: spi_xfer_in usage on PIC16F15325
PostPosted: Mon Dec 23, 2019 11:11 am     Reply with quote
Momboz wrote:

In my case C0/C1 is SPI1 according to the Microchip datasheet.
Your statement is that I could use the hardware SPI in slave mode(since slave mode is not allowed in software SPI). That means my code will look like this:
Code:
...
#use spi(FORCE_HW, SLAVE, BITS=24, stream=SPI_STREAM)
...
data_in = spi_xfer_in(SPI_STREAM,24);
...


Te compiler still gives error during compilation:
"*** Error 99 "CCS_15325_Micro.c" Line 6(5,54): Option invalid Wrong pins for H/W"

Any advice? Thank you.


You need to tell it which hardware SPI you are using. Nothing in the #use spi() says which. Try adding SPI1
Code:
...
#use spi(SPI1,FORCE_HW, SLAVE, BITS=24, stream=SPI_STREAM)
...
data_in = spi_xfer_in(SPI_STREAM,24);
...


For some compiler versions, specifying the pins but not the SPI module puts it in software SPI mode instead of hardware.

EDIT: also what size is long for your pic (I don't know offhand for 8bit pics)? you will need to have a 32bit value. Specify it as unsigned int32 to be sure.
Ttelmah



Joined: 11 Mar 2010
Posts: 19499

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PostPosted: Mon Dec 23, 2019 2:39 pm     Reply with quote
Yes, his long is only 16bit. Needs to be unsigned int32.


Happy Christmas everyone
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