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f.c
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f.c
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//
// simple program to test binary file-reading
//
#include <stdio.h>
#include <wiringPi.h>
#include <wiringPiSPI.h>
// function declarations
int initializePiGPIO();
int sendFrame(unsigned char *data, int length);
int main()
{
initializePiGPIO();
char data[4];
*(data + 0) = 66;
*(data + 1) = 66;
*(data + 2) = 66;
*(data + 3) = 66;
sendFrame(data,4);
return 0;
}
int sendFrame(unsigned char *data, int length) {
printf("sendFrame received %s, %d\n",data,length);
wiringPiSPIDataRW(0, data, length);
printf("received data: %s\n",data);
}
int initializePiGPIO()
{
wiringPiSetup(); // initialize GPIO
int fd = wiringPiSPISetupMode(0,500000,0); // initialize SPI channel 0
if (fd <= -1)
{
printf("SPI setup failed\n");
return 1;
}
printf("wiringPiSPISetup returned status = %d\n",fd);
return 0;
}