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[SOLVED] Trouble getting SPI to work on PIC16F1509

 
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picj1984



Joined: 01 Mar 2010
Posts: 51

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[SOLVED] Trouble getting SPI to work on PIC16F1509
PostPosted: Wed Jul 11, 2018 4:30 pm     Reply with quote

Hello,

I'm looking at the pins with a scope and I can't seem to get anything going for SPI. Been working on in all day and I figure I must be doing something incredibly stupid. I simplified as much as possible here and still nothing:

DETAILS:

PCM Compiler V4.140
PIC161509
Target Voltage is 5V
Osc Speed 16MHz internal
Code:


#include <16f1509.h>
#fuses HS, NOWDT, NOLVP, PROTECT
#device ADC=10
#use delay(clock=16000000, int)
#use spi(MASTER, IDLE=1, SAMPLE_RISE, SPI1, FORCE_HW, ENABLE=PIN_C6, STREAM=STREAM1)




void main ()
{

while(1)
{

spi_xfer(STREAM1,80,16);
delay_ms(1000);

}
}


Last edited by picj1984 on Thu Jul 12, 2018 11:10 am; edited 1 time in total
PCM programmer



Joined: 06 Sep 2003
Posts: 20318

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PostPosted: Wed Jul 11, 2018 4:47 pm     Reply with quote

Without even looking at your program too closely, I can say the loop delay
is way too long. See this thread:
http://www.ccsinfo.com/forum/viewtopic.php?t=56768
He shortened his loop delay and then he could see the SPI pulses.
Ttelmah



Joined: 11 Mar 2010
Posts: 13156

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PostPosted: Wed Jul 11, 2018 11:20 pm     Reply with quote

Also, 'be aware', that SPI, if specified without a baud rate, will run as fast as possible, so without reading the data sheet and checking, I'd guess yours will be running at 4MHz. A fast clock to see especially with just 16 pulses sent once per second (a lot less if you are looking at the data line)....
picj1984



Joined: 01 Mar 2010
Posts: 51

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solved!
PostPosted: Thu Jul 12, 2018 11:12 am     Reply with quote

y'all are a bunch of geniuses.
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