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Add function to adjust gamma #28

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Merged
sajattack merged 3 commits into from
May 28, 2025
Merged

Add function to adjust gamma #28

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cb17edc
Add function to adjust gamma. Include constants that seem to work wel…
austinleroy May 20, 2025
2063202
Move magic values for gamma from code to comment
austinleroy May 21, 2025
ff3ac6b
Remove leading & trailing lines from comment
austinleroy May 27, 2025
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12 changes: 12 additions & 0 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -245,6 +245,18 @@ where
self.set_address_window(sx, sy, ex, ey)?;
self.write_pixels_buffered(colors)
}

/// Allows adjusting gamma correction on the display.
///
/// Takes in an array `pos` for positive polarity correction and an array `neg` for negative polarity correction.
///
/// The following values worked well on an ST7735S test device:
/// pos: &[0x10, 0x0E, 0x02, 0x03, 0x0E, 0x07, 0x02, 0x07, 0x0A, 0x12, 0x27, 0x37, 0x00, 0x0D, 0x0E, 0x10]
/// neg: &[0x10, 0x0E, 0x03, 0x03, 0x0F, 0x06, 0x02, 0x08, 0x0A, 0x13, 0x26, 0x36, 0x00, 0x0D, 0x0E, 0x10]
pub fn adjust_gamma(&mut self, pos: &[u8;16], neg: &[u8;16]) -> Result<(), ()> {
self.write_command(Instruction::GMCTRP1, pos)?;
self.write_command(Instruction::GMCTRN1, neg)
}
}

#[cfg(feature = "graphics")]
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