/* 	This program is distributed under the GPL, version 2	
	Requirement libftdi-dev, libftdi packages.
	Compilation
		gcc -o ledshift -l ftdi ledshift.c
*/

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

int main(int argc, char **argv)
{
	struct ftdi_context ftdic;
	int f,i;
	unsigned char buf[1];
	char c;

	ftdi_init(&ftdic);
	f = ftdi_usb_open(&ftdic, 0x0403, 0x6001);
	if(f < 0 && f != -5) {
		fprintf(stderr, "unable to open ftdi device: %d (%s)\n", f, ftdi_get_error_string(&ftdic));
		exit(-1);
	}
	printf("ftdi open succeeded: %d\n",f);
	printf("enabling bitbang mode\n");
	ftdi_enable_bitbang(&ftdic, 0xFF);

	sleep(1);
	buf[0]=0x01;
	do {
		buf[0] = (buf[0]==0x80)?0x01:buf[0]<<1;
		f = ftdi_write_data(&ftdic, buf, 1);
		if(f < 0) {
			fprintf(stderr,"write failed for 0x%x, error %d (%s)\n",buf[0],f, ftdi_get_error_string(&ftdic));
		}
		printf("%02hhx \n",buf[0]);
		fflush(stdout);
		usleep(500000);
		//c=getchar();
	  } while (c != ' ');
	printf("disabling bitbang mode\n");
	ftdi_disable_bitbang(&ftdic);
	ftdi_usb_close(&ftdic);
	ftdi_deinit(&ftdic);
}