43 lines
1.8 KiB
Markdown
43 lines
1.8 KiB
Markdown
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# Debug VGA param
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## Params for custom VGA
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Modify file: `sudo nano /boot/config.txt` then restart to apply
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dpi_group=2
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dpi_mode=87
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dpi_timings= xxxx
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## Tests:
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- 640x480 60Hz : `dpi_timings=640 0 16 96 48 480 0 11 2 31 0 0 0 60 0 25175000 1 `
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Visible but only halph of the screen...
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- 320x240 60Hz : 'dpi_timings=320 1 12 32 44 240 1 6 10 6 0 0 0 60 0 6400000 1`
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Not working
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## Syntax:
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`hdmi_timings=<h_active_pixels> <h_sync_polarity> <h_front_porch> <h_sync_pulse> <h_back_porch> <v_active_lines> <v_sync_polarity> <v_front_porch> <v_sync_pulse> <v_back_porch> <v_sync_offset_a> <v_sync_offset_b> <pixel_rep> <frame_rate> <interlaced> <pixel_freq> <aspect_ratio>`
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- <h_active_pixels> = horizontal pixels (width)
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- <h_sync_polarity> = invert hsync polarity
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- <h_front_porch> = horizontal forward padding from DE acitve edge
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- <h_sync_pulse> = hsync pulse width in pixel clocks
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- <h_back_porch> = vertical back padding from DE active edge
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- <v_active_lines> = vertical pixels height (lines)
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- <v_sync_polarity> = invert vsync polarity
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- <v_front_porch> = vertical forward padding from DE active edge in horizontal sync pulse
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- <v_sync_pulse> = vsync pulse width in pixel clocks
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- <v_back_porch> = vertical back padding from DE active edge in horizontal sync pulse
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- <v_sync_offset_a> = leave at zero
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- <v_sync_offset_b> = leave at zero
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- <pixel_rep> = leave at zero
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- <frame_rate> = screen refresh rate in Hz
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- <interlaced> = leave at zero
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- <pixel_freq> = clock frequency (width*height*framerate)
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- <aspect_ratio> = *
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HDMI_ASPECT_4_3 = 1
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HDMI_ASPECT_14_9 = 2
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HDMI_ASPECT_16_9 = 3
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HDMI_ASPECT_5_4 = 4
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HDMI_ASPECT_16_10 = 5
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HDMI_ASPECT_15_9 = 6
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HDMI_ASPECT_21_9 = 7
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HDMI_ASPECT_64_27 = 8
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