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lokken
Joined: 21 Feb 2010
Posts: 17
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| Basic Read/Write Operation at SPI module |
 Posted: Tue Jan 25, 2011 1:46 am |
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I want to use SPI module of PIC 18f14k50. And first of all I wrote basic read/write commands for testing but I didn't achieve. My aim is sending a byte (data=15) with SPI module of 18f14k50. But I see wrong value at the serial port monitor. My compiler verison is 4.114. My codes:
Master
| Code: |
#include <18f14k50.h>
#include <PIC18f14k50_registers.h>
#FUSES NOWDT,XT,NOPUT,NOBROWNOUT,NOLVP,NOCPD,NOMCLR
#use delay(clock=4000000)
int16 timeout;
int temp,data;
void main(void)
{
data=21;
TRISC=0x00;
TRISB=0b00110000;
sspcon1=0b00100000;
sspstat=0b00100000;
temp=SSPBUF;
while(1)
{
SSPBUF=data;
while(!BF&&timeout<5000){
delay_us(1);
timeout++;
}
timeout=0;
temp=SSPBUF;
delay_ms(100);
}
} |
SLAVE
| Code: |
#include <18f14k50.h>
#include <PIC18f14k50_registers.h>
#FUSES NOWDT,XT,NOPUT,NOBROWNOUT,NOLVP,NOCPD,NOMCLR
#use delay(clock=4000000)
#use rs232(baud=9600, xmit=PIN_B7,rcv=PIN_B5)
int16 timeout;
int temp,data;
void main(void)
{
TRISB=0b01110000;
TRISC=0x00;
SSPCON1=0b00100101;
SSPSTAT=0b01000000;
temp=SSPBUF;
while(1)
{
data=SSPBUF;
while(!BF&&timeout<5000){
delay_us(1);
timeout++;
}
timeout=0;
printf("%d\r",data);
}
}
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I just want basic read/write operation in SPI modes. Could you propose anything? I tried same codes for PIC16f877 and it is worked but I couldn't do it for 18f14k50.
Thanks |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue Jan 25, 2011 3:03 pm |
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I don't know why you are writing directly to registers. I tested the
setup_spi() and spi_write() functions with vs. 4.114 and they work OK.
I see pulses on SDO (pin C7) and SCK (pin B6). Here is the test program:
| Code: |
#include <18F14K50.H>
#fuses INTRC_IO, NOWDT, PUT, BROWNOUT, NOLVP, CPUDIV1
#use delay(clock=4000000)
#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)
//=================================
void main()
{
setup_spi(SPI_MASTER | SPI_MODE_0 | SPI_CLK_DIV_16);
while(1)
{
spi_write(0x33);
delay_us(100);
}
} |
This thread has an example of an SPI Master/Slave program for two PICs:
http://www.ccsinfo.com/forum/viewtopic.php?t=39145
Here's an SPI slave test program for a single PIC:
http://www.ccsinfo.com/forum/viewtopic.php?t=26888 |
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