Messages in this thread | | | Subject | Re: [PATCH v3 3/3] drm/tinydrm: add driver for ST7735R panels | From | Noralf Trønnes <> | Date | Sun, 31 Dec 2017 17:19:04 +0100 |
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Den 21.12.2017 20.35, skrev David Lechner: > On 12/21/2017 01:23 PM, David Lechner wrote: >> This adds a new driver for Sitronix ST7735R display panels. >> >> This has been tested using an Adafruit 1.8" TFT. >> >> Signed-off-by: David Lechner <david@lechnology.com> >> --- > > <snip> > >> + mipi_dbi_command(mipi, ST7735R_GAMCTRP1, 0x0f, 0x1a, 0x0f, 0x18, >> 0x2f, >> + 0x28, 0x20, 0x22, 0x1f, 0x1b, 0x23, 0x37, 0x00, 0x07, >> + 0x02, 0x10); >> + mipi_dbi_command(mipi, ST7735R_GAMCTRN1, 0x0f, 0x1b, 0x0f, 0x17, >> 0x33, >> + 0x2c, 0x29, 0x2e, 0x30, 0x30, 0x39, 0x3f, 0x00, 0x07, >> + 0x03, 0x10); > By the way, how do you know what is the "right" gamma curve? I think I > copied this from the generic st7735r driver in fbtft, but I noticed > that there is also a different curve for the Adafruit 1.8" display in > fbtft. I'm wondering if I should have used that one instead. I can't > really tell a difference looking at the display.
From what I can tell this is the curve used by the Arduino library:
https://github.com/adafruit/Adafruit-ST7735-Library/blob/master/Adafruit_ST7735.cpp
static const uint8_t PROGMEM Rcmd3[] = { // Init for 7735R, part 3 (red or green tab) 4, // 4 commands in list: ST7735_GMCTRP1, 16 , // 1: Magical unicorn dust, 16 args, no delay: 0x02, 0x1c, 0x07, 0x12, 0x37, 0x32, 0x29, 0x2d, 0x29, 0x25, 0x2B, 0x39, 0x00, 0x01, 0x03, 0x10, ST7735_GMCTRN1, 16 , // 2: Sparkles and rainbows, 16 args, no delay: 0x03, 0x1d, 0x07, 0x06, 0x2E, 0x2C, 0x29, 0x2D, 0x2E, 0x2E, 0x37, 0x3F, 0x00, 0x00, 0x02, 0x10,
void Adafruit_ST7735::initR(uint8_t options) { commonInit(Rcmd1); ... commandList(Rcmd3);
Noralf.
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