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PIC24F16KA102 SPI

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cinginanewlight

Joined: 29 Feb 2012
Posts: 1

PIC24F16KA102 SPI

Posted: Wed Feb 29, 2012 6:33 am

I'm new to PIC's and I am probably missing something very simple, but I can't get the h/w SPI to work.

The serial clock pin is pulled high and the data pin stays low.

My code is as follows, I've loaded it into two24F16KA102's, and I am using a scope to view the IC pins.

Code:

#include <24F16KA102.h>
// compiler v4.120

#device ICD=TRUE

#fuses MCLR,NOWDT,NOPROTECT,NOBROWNOUT,HS

#use delay (clock=4M)

void main() {

/* while (true) {
output_toggle (PIN_B10); // check port h/w works- OK squarewaves can be seen
output_toggle (PIN_B11); // tried another chip too!
delay_ms(20);
} */

// setup_spi(SPI_MASTER | SPI_H_TO_L | SPI_XMIT_L_TO_H | SPI_CLK_DIV_16);
setup_spi(SPI_MASTER | SPI_H_TO_L | SPI_CLK_DIV_16);

while (true)

{
spi_write (0xFF); // RB10 sclk is pulled high
delay_ms(500); // RB11 sdata is 0V
spi_write (0x00);
delay_ms(500);

output_toggle(PIN_A4); //heartbeat LED OK!
}

}

Any suggestions and help for a newbie will be gladly received.

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