diff options
Diffstat (limited to 'src/illuminate.c')
| -rw-r--r-- | src/illuminate.c | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/src/illuminate.c b/src/illuminate.c new file mode 100644 index 0000000..a0f146d --- /dev/null +++ b/src/illuminate.c @@ -0,0 +1,164 @@ +#include <ftdi.h> +#include <time.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include "illuminate.h" + +// FTDI Vendor ID +#define VID 0x0403 +// FTDI Product ID +#define PID 0x6001 + +#define DMX_CHANNELS 6 +//#define DMX_CHANNELS 512 +//#define DMX_FRAMETIME 24000000 +#define DMX_FRAMETIME 0 +#define DMX_BREAK 110000 +#define DMX_MAB 16000 + +#define MAX_STR 64 + +/* +struct ftdi_device_list +{ + // pointer to next entry + struct ftdi_device_list *next; + // pointer to libusb's usb_device + struct usb_device *dev; +} +*/ + +inline void ts_diffadd(struct timespec *res, struct timespec *a, struct timespec *b, struct timespec *c); +void e(int res, const char *funcname, struct ftdi_context *ftdi, int exit_val); +int dmx_universe_write(struct ftdi_context *ftdi, unsigned char *universe, int uni_len); + +struct ftdi_context ftdi; +struct ftdi_device_list *devlist=NULL; +char *manufacturer, *description, *serial; +unsigned char universe[DMX_CHANNELS+1]; + +int dmx_init() { + + struct usb_device *dev=NULL; + + struct timespec ts_to_sleep; + + (void) memset(universe, 0, sizeof(universe)); + (void) memset(&ftdi, 0, sizeof(ftdi)); + + 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 USB ID 0x%04X:0x%04X)\n", VID, PID); + return(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); + + return 0; +} + +int dmx_write_rgb(int r, int g, int b) { + if (! ftdi.usb_dev ) return -1; + + universe[2]=r; + universe[3]=g; + universe[4]=b; + + return dmx_universe_write(&ftdi, universe, DMX_CHANNELS); +} + +void dmx_deinit() { + e(ftdi_usb_close(&ftdi),"ftdi_usb_close",&ftdi,50); + ftdi_list_free(&devlist); + ftdi_deinit(&ftdi); + + free(manufacturer); + free(description); + free(serial); +} + +int dmx_universe_write(struct ftdi_context *ftdi, unsigned char *universe, int uni_len) { + //static struct timespec ts_frame_time={0,DMX_FRAMETIME}; + static struct timespec ts_dmx_break={0,DMX_BREAK}; + static struct timespec ts_dmx_mab={0,DMX_MAB}; + //static struct timespec ts_trame_begin={0,0}; + //struct timespec ts_to_sleep, ts_now; + + // http://www.opendmx.net/index.php/DMX512-A#Timings + // http://www.erwinrol.com/?s=dmx + // symbo_perdiod is 4us (250kHz) + // Full packet minimal timing : DMX_BREAK+DMX_MAB+(1+8+2)*513*symbol_period=22698us + + ftdi_async_complete(ftdi,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); + + //fprintf(stderr, "DEBUG : ts_to_sleep==%li.%09li\n", ts_to_sleep.tv_sec, ts_to_sleep.tv_nsec); +// ts_to_sleep.tv_sec=0; +// ts_to_sleep.tv_nsec=23000000; + 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); + + + //return ftdi_write_data(ftdi, universe, uni_len); + return ftdi_write_data_async(ftdi, universe, uni_len); +} + +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); + } + +} + |