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#include <ftdi.h>
#include <time.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
// FTDI Vendor ID
#define VID 0x0403
// FTDI Product ID
#define PID 0x6001
#define DMX_CHANNELS 512
// One "official" DMX frame can take (1s/44Hz) = 22727272ns
#define DMX_FRAMETIME 22727272
#define DMX_BREAK 110000
#define DMX_MAB 16000
#define MAX_STR 64
inline void ts_diffadd(struct timespec *res, struct timespec *a, struct timespec *b, struct timespec *c) {
time_t rem;
res->tv_nsec=a->tv_nsec-b->tv_nsec+c->tv_nsec;
rem=res->tv_nsec/1000000000;
res->tv_nsec=res->tv_nsec%1000000000;
res->tv_sec=a->tv_sec-b->tv_sec+c->tv_sec+rem;
if (res->tv_nsec<0 && res->tv_sec>0) res->tv_sec--; res->tv_nsec+=1000000000;
if (res->tv_nsec>0 && res->tv_sec<0) res->tv_nsec-=1000000000; res->tv_sec++;
}
void e(int res, const char *funcname, struct ftdi_context *ftdi, int exit_val) {
char *reason;
if ( res < 0 ) {
reason=ftdi_get_error_string(ftdi);
fprintf(stderr, "Error in %s : %s\n", funcname, reason);
exit(exit_val);
}
}
/*
struct ftdi_device_list
{
// pointer to next entry
struct ftdi_device_list *next;
// pointer to libusb's usb_device
struct usb_device *dev;
}
*/
int main() {
int res;
char *manufacturer, *description, *serial;
char universe[DMX_CHANNELS+1];
struct ftdi_context ftdi;
struct ftdi_device_list *devlist=NULL;
struct usb_device *dev=NULL;
struct timespec ts_frame_time, ts_dmx_break, ts_dmx_mab, ts_to_sleep, ts_trame_begin, ts_now;
ts_frame_time.tv_sec=0;
ts_frame_time.tv_nsec=DMX_FRAMETIME;
ts_dmx_break.tv_sec=0;
ts_dmx_break.tv_nsec=DMX_BREAK;
ts_dmx_mab.tv_sec=0;
ts_dmx_mab.tv_nsec=DMX_MAB;
(void) memset(universe, 0, DMX_CHANNELS);
(void) memset(&ftdi, 0, sizeof(ftdi));
universe[DMX_CHANNELS]=0;
manufacturer=malloc(MAX_STR);
description=malloc(MAX_STR);
serial=malloc(MAX_STR);
e(ftdi_init(&ftdi),"ftdi_init",&ftdi,10);
e(ftdi_usb_find_all(&ftdi, &devlist, VID, PID),"ftdi_usb_find_all",&ftdi,11);
//Always take the first device
if (devlist==NULL || devlist->dev==NULL) {
fprintf(stderr, "No usb device detected (looking for 0x%04X:0x%04X)\n", VID, PID);
exit(2);
}
dev=devlist->dev;
// fprintf(stderr, "DEBUG : next==%p\n", devlist->next);
e(ftdi_usb_get_strings(&ftdi, dev, manufacturer, MAX_STR, description, MAX_STR, serial, MAX_STR),"ftdi_usb_get_strings",&ftdi,12);
fprintf(stderr, "Connecting to USB device ('%s','%s','%s')\n", manufacturer, description, serial);
e(ftdi_usb_open_dev(&ftdi,dev),"ftdi_usb_open_dev",&ftdi,13);
fprintf(stderr, "Connected\n");
//Init the device
e(ftdi_usb_reset(&ftdi),"ftdi_usb_reset",&ftdi,15);
e(ftdi_set_baudrate(&ftdi, 250000),"ftdi_set_baudrate",&ftdi,16);
e(ftdi_set_line_property(&ftdi, BITS_8, STOP_BIT_2, NONE),"ftdi_set_line_property",&ftdi,17);
e(ftdi_setflowctrl(&ftdi, SIO_DISABLE_FLOW_CTRL),"ftdi_setflowctrl",&ftdi,18);
e(ftdi_usb_purge_buffers(&ftdi),"ftdi_usb_purge_buffers",&ftdi,19);
e(ftdi_setrts(&ftdi, 0),"ftdi_setrts",&ftdi,20);
// 1ms pause for initialization completion
ts_to_sleep.tv_sec=0;
ts_to_sleep.tv_nsec=1000000;
nanosleep(&ts_to_sleep,NULL);
ts_trame_begin.tv_sec=0;
ts_trame_begin.tv_nsec=0;
// Wait the end of the previous timeslot
clock_gettime(CLOCK_MONOTONIC, &ts_now);
ts_diffadd(&ts_to_sleep,&ts_frame_time,&ts_now,&ts_trame_begin);
nanosleep(&ts_to_sleep,NULL);
clock_gettime(CLOCK_MONOTONIC, &ts_trame_begin);
e(ftdi_set_line_property2(&ftdi, BITS_8, STOP_BIT_2, NONE, BREAK_ON),"ftdi_set_line_property2",&ftdi,30);
nanosleep(&ts_dmx_break,NULL);
e(ftdi_set_line_property2(&ftdi, BITS_8, STOP_BIT_2, NONE, BREAK_OFF),"ftdi_set_line_property2",&ftdi,31);
nanosleep(&ts_dmx_mab,NULL);
// Tests
universe[2]=120;
universe[3]=120;
universe[4]=120;
//e(ftdi_write_data(&ftdi, universe, DMX_CHANNELS),"ftdi_write_data",&ftdi,32);
res=ftdi_write_data(&ftdi, universe, DMX_CHANNELS);
//fprintf(stderr, "DEBUG : to_sleep=={%li,%li}\n", ts_to_sleep.tv_sec, ts_to_sleep.tv_nsec);
fprintf(stderr, "DEBUG : res==%i\n", res);
// fprintf(stderr, "DEBUG : universe==%s\n", universe);
e(ftdi_usb_close(&ftdi),"ftdi_usb_close",&ftdi,50);
ftdi_list_free(&devlist);
ftdi_deinit(&ftdi);
free(manufacturer);
free(description);
free(serial);
exit(0);
}
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