Setting timing parameters

Timing parameters

Setting timing parameters

The timing parameters that Wfdcfg requires are available in, or can be derived from, the product specfication of your display hardware. Below is a table of typical timings based on display resolutions and refresh rates:

For example,

struct mode {
	const struct wfdcfg_timing timing;
	const struct wfdcfg_keyval *ext_list;
};

static const struct mode sample_timings[] = {
	{
		// 800x480 @ 60 Hz
		.timing = {
			.pixel_clock_kHz =  29760,
			.hpixels =  800, .hfp= 24, .hsw= 72, .hbp= 96,  //  992 total
			.vlines  =  480, .vfp=  3, .vsw= 10, .vbp=  7,  //  500 total
			.flags = WFDCFG_INVERT_HSYNC,
		},
		.ext_list = (const struct wfdcfg_keyval[]){
			{ "ext_1_example", .i = 1 },
			{ "ext_2_example", .i = 2 },
			{ NULL }  // marks end of list
		},
	},
	{
		// 1024x768 @ 60 Hz (CVT)
		.timing = {
			.pixel_clock_kHz =  63500,
			.hpixels = 1024, .hfp= 48, .hsw=104, .hbp=152,  // 1328 total
			.vlines  =  768, .vfp=  3, .vsw=  4, .vbp= 23,  //  798 total
			.flags = WFDCFG_INVERT_VSYNC,
		},
		.ext_list = NULL,
	},
	{
		// 1280x1024 @ 60 Hz (CVT)
		.timing = {
			.pixel_clock_kHz = 109000,
			.hpixels = 1280, .hfp= 88, .hsw=128, .hbp=216,  // 1712 total
			.vlines  = 1024, .vfp=  3, .vsw=  7, .vbp= 29,  // 1063 total
			.flags = WFDCFG_INVERT_VSYNC,
		},
		.ext_list = NULL,
	},
	{
		// 1080p @ 60 Hz (1920x1080)
		.timing = {
			.pixel_clock_kHz = 148500,
			.hpixels = 1920, .hfp= 88, .hsw= 44, .hbp=148,  // 2200 total
			.vlines  = 1080, .vfp=  4, .vsw=  5, .vbp= 36,  // 1125 total
			.flags = 0,
		},
		.ext_list = NULL,
	},
	{
		// 720p @ 60 Hz (1280x720)
		.timing = {
			.pixel_clock_kHz =  74250,
			.hpixels = 1280, .hfp=110, .hsw= 40, .hbp=220,  // 1650 total
			.vlines  =  720, .vfp=  5, .vsw=  5, .vbp= 20,  //  750 total
			.flags = 0,
		},
		.ext_list = NULL,
	},
	{
		// marks end of list
		.timing = {.pixel_clock_kHz = 0},
	},
};