C code to use baconbits two 7 segment displays

7segment.c

#include <stdio.h>
#include <unistd.h>

int main() {
	FILE * spidev = fopen("/dev/spidev2.1", "wb");
	//Left 7 Segment
	fwrite("\x40\x00\xc0", 1, 3, spidev);//"0's" are on, "1's" are off
	//Right 7 Segment
	fwrite("\x40\x01\xc0", 1, 3, spidev); 
  //You should see the segments look like zeroes. 
	fflush(spidev);
}