CCS :: View topic - SPI Clock - how do I force on always ?

FAQ

Forum Help

Official CCS Support

Profile Log in to check your private messages Log in

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to CCS Technical Support

SPI Clock - how do I force on always ?

CCS Forum Index -> General CCS C Discussion

View previous topic :: View next topic

Author

Message

PCM programmer

Joined: 06 Sep 2003
Posts: 21708

Posted: Thu Dec 17, 2009 1:46 pm

Your program is too complicated. Make a simple program that will
just put out SPI clock and data. Example:

Code:

#include <18F4620.h>
#fuses HS,NOWDT,NOPROTECT,BROWNOUT,PUT,NOLVP
#use delay(clock=20000000)

#define SPI_MODE_0 (SPI_L_TO_H | SPI_XMIT_L_TO_H)
#define SPI_MODE_1 (SPI_L_TO_H)
#define SPI_MODE_2 (SPI_H_TO_L)
#define SPI_MODE_3 (SPI_H_TO_L | SPI_XMIT_L_TO_H)

//===============================
main(void)
{

setup_spi(SPI_MASTER | SPI_MODE_0 | SPI_CLK_DIV_16);

while(1)
{
spi_write(0x55);
delay_us(100);
}

}

Quote:

#INT_SSP
void ssp_handler()
{
disable_interrupts(GLOBAL); // Not necessary
printf("\r\n Interrupt on SPI");
enable_interrupts(GLOBAL); // Very bad
}

Don't ever do this. You have never seen us do this on the forum.
Read the forum and the PIC data sheet. Don't enable global interrupts
inside an interrupt service routine.

Display posts from previous:

	CCS Forum Index -> General CCS C Discussion	All times are GMT - 6 Hours
Page 1 of 1

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum