ENTTEC OPEN DMX USB

lsusb | grep FT232
Bus 004 Device 005: ID 0403:6001 Future Technology Devices International, Ltd FT232 USB-Serial (UART) IC


On peut communiquer avec ce périphérique Série via la libftdi

i   libftdi1                                                                          - Library to control and program the FTDI USB controller 


Dans l'ordre :

#include <time.h>

static const int VID = 0x0403; //! FTDI Vendor ID
static const int PID = 0x6001; //! FTDI Product ID

// One "official" DMX frame can take (1s/44Hz) = 22727272ns
#define DMX_FRAMETIME 22727272
#define DMX_BREAK 110000
#define DMX_MAB 16000
#define DMX_CHANNELS 512

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/1e9
	res.tv_nsec=res.tv_nsec%1e9;
	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+=1e9;
	if (res.tv_nsec>0 && res.tv_sec<0) res.tv_nsec-=1e9; res.tv_sec++;
}


ftdi_usb_find_all(&ftdi, &list, QLCFTDI::VID, QLCFTDI::PID);

ftdi_usb_open_desc(&m_handle, QLCFTDI::VID, QLCFTDI::PID, name().toAscii(), serial().toAscii())
ftdi_usb_reset(&m_handle)
ftdi_set_baudrate(&m_handle, 250000)
ftdi_set_line_property(&m_handle, BITS_8, STOP_BIT_2, NONE)
ftdi_setflowctrl(&m_handle, SIO_DISABLE_FLOW_CTRL)
ftdi_usb_purge_buffers(&m_handle)
ftdi_setrts(&m_handle, 0)

frame_time.tv_sec=0;
frame_time.tv_nsec=DMX_FRAMETIME;

// Attente initiale (juste après ouverture periph)
to_sleep.tv_sec=0;
to_sleep.tv_nsec=1e6;
nanosleep(to_sleep,NULL);


clock_gettime(CLOCK_MONOTONIC, now);

ts_diffadd(to_sleep,frame_time,now,trame_begin);
nanosleep(to_sleep);

clock_gettime(CLOCK_MONOTONIC, trame_begin);
ftdi_set_line_property2(&m_handle, BITS_8, STOP_BIT_2, NONE, BREAK_ON)
usleep(DMX_BREAK); 
ftdi_set_line_property2(&m_handle, BITS_8, STOP_BIT_2, NONE, BREAK_OFF)
usleep(DMX_MAB);
m_ftdi->write(m_universe)
ftdi_write_data(&m_handle, m_universe, sizeof(m_universe))



ftdi_usb_close(&m_handle) 



rq : si résultat <0, affichage erreur avec ftdi_get_error_string(&m_handle)