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SPI freezes PIC16f690

 
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peter-storm



Joined: 26 Jan 2008
Posts: 11

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SPI freezes PIC16f690
PostPosted: Tue Feb 26, 2008 6:33 pm     Reply with quote
Hi all,

If I implement my code using spi_write() the program works. If I use spi_xfer instead, it hangs at the first instance of this command and I'm not sure why. The help doesn't really explain the difference between spi_write() and spi_xfer(), but it appears that spi_xfer() uses much less memory.

Here is a segment of my code, any help is appreciated.

Code:

#fuses HS, NOWDT, NOPROTECT, BROWNOUT
#use delay(clock=8000000)
#use rs232(baud=19200,parity=N,xmit=PIN_B7,rcv=PIN_B5,bits=8,STREAM=ETRX)
#use spi(FORCE_HW,SPI1,MASTER, BITS=8, LSB_FIRST,ENABLE=PIN_C6)
#include <string.h>
#include <vl1001.c>
#include <ascii-bitmapping.c>

here is the function where it crashes:


void upd_lcd()
{
char time1[18];
char time2[18];
char activity1[18];
char activity2[18];


gets(time1);
gets(activity1);
gets(time2);
gets(activity2);

spi_xfer(0xa3); << this is where it stops working
spi_xfer(0x1a);
etc...
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Tue Feb 26, 2008 7:05 pm     Reply with quote
1. Make it into a complete test program. Only put lines of code in
the program that are needed to show the problem. For example,
if you can demonstrate the problem without all those #include files
and without all the gets() statements, then delete them.

See my post in this thread, where I show some test programs:
http://www.ccsinfo.com/forum/viewtopic.php?t=33372
This is what I mean. If you can strip your code down to a program
as short as that, then I can probably find the problem.


2. Very important: Post your compiler version.
peter-storm



Joined: 26 Jan 2008
Posts: 11

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PostPosted: Wed Feb 27, 2008 5:01 am     Reply with quote
Code:

#include <16f690.h>

#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT
#use delay(clock=8000000)
#use rs232(baud=19200,parity=N,xmit=PIN_B7,rcv=PIN_B5,bits=8,STREAM=ETRX)
#use spi(FORCE_HW,SPI1,MASTER, BITS=8, LSB_FIRST,ENABLE=PIN_C6)


void main()
{
   set_tris_c (0x00);
   setup_adc_ports (NO_ANALOGS | VSS_VDD);
   setup_adc (ADC_OFF);
   setup_spi (SPI_MASTER | SPI_L_TO_H | SPI_CLK_DIV_4);
   setup_timer_0 (RTCC_INTERNAL | RTCC_DIV_1);
   
   setup_timer_1 (T1_DISABLED);
   setup_timer_2 (T2_DISABLED, 0, 1);
   setup_comparator (NC_NC_NC_NC);
   setup_oscillator (OSC_8MHZ);

   

   
     
 

  printf("AT+SCAST:UPD\r");
   
   delay_ms(2000);
   spi_xfer(01010101);
   
   printf("AT+SCAST:BAT\r");
   
 
 

}


My compiler version is 4.057.

thanks
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Wed Feb 27, 2008 12:53 pm     Reply with quote
Quote:
#include <16f690.h>

#fuses HS, NOWDT, NOPROTECT, BROWNOUT, PUT
#use delay(clock=8000000)
#use rs232(baud=19200,parity=N,xmit=PIN_B7,rcv=PIN_B5,bits=8,STREAM=ETRX)
#use spi(FORCE_HW,SPI1,MASTER, BITS=8, LSB_FIRST,ENABLE=PIN_C6)

void main()
{
set_tris_c (0x00);
setup_adc_ports (NO_ANALOGS | VSS_VDD);
setup_adc (ADC_OFF);
setup_spi (SPI_MASTER | SPI_L_TO_H | SPI_CLK_DIV_4);
setup_timer_0 (RTCC_INTERNAL | RTCC_DIV_1);

setup_timer_1 (T1_DISABLED);
setup_timer_2 (T2_DISABLED, 0, 1);
setup_comparator (NC_NC_NC_NC);
setup_oscillator (OSC_8MHZ);

printf("AT+SCAST:UPD\r");

delay_ms(2000);
spi_xfer(01010101);

printf("AT+SCAST:BAT\r");

}


CCS has two methods of using SPI. The original method uses
setup_spi() to configure the SPI module, and spi_write(), spi_read(),
etc., to do the SPI transfers.

The new method does the SPI setup with a #use spi() statement,
and it does the transfers with spi_xfer().

You should not mix these two methods. In your code above, you're
using the new method, so you should delete the setup_spi() statement.
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