SPI 16F877A

[ph]

Hello, I need some help. I need to write to SPI but when I do it nothing happens, the oscilloscope doesn’t show anything. I think I’m forgetting to put something in my code.


#include "D:\PF\CCS\CCS\PIC16F877A\projetofinal\main.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


void main() {
char ch[4]; // ch --> contém o número
int8 j,total,i[96]; //i --> armazena a matriz com os valores para gravação

setup_adc_ports(NO_ANALOGS);
setup_adc(ADC_OFF);
setup_psp(PSP_DISABLED);
setup_spi(SPI_MASTER|SPI_L_TO_H|SPI_CLK_DIV_4);
setup_counters(RTCC_INTERNAL,RTCC_DIV_2);
setup_timer_1(T1_DISABLED);
setup_timer_2(T2_DISABLED,0,1);
setup_comparator(NC_NC_NC_NC);
setup_vref(FALSE);

i[0]=0;
j=0;
while(true)
{

gets(ch);

switch (ch[0])
{
case 'p':
{
gets(ch);
total=atoi(ch);

for (j=0;j<total;j++)
{
gets(ch);
i[j]=atoi(ch);
}

printf("Dados emitidos: %u\n ",total);

for (j=0;j<total;j++)
{
printf("PIC %u\n",i[j]);
}

for (j=0;j<total;j++)
{
spi_write(i[j]);
}

}
}
total=atoi(ch);
printf("Dados invalidos %u\n ",total);
}


}

[PCM programmer]

Try a very simple test program like the code below.
If your crystal or oscillator is running at a different frequency
than 4 MHz, then change the #use delay() statement.
Also, if your crystal is at a higher frequency than 4 MHz,
change the fuse from "XT" to "HS".

Then look at pins 18 and 24 (on the 40-pin DIP package)
and you should see SCLK and SDO pulses. It worked for
me with the PicDem2-Plus board, and PCM compiler vs. 3.236.