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111 lines
4.9 KiB
111 lines
4.9 KiB
/*
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* Copyright 2023 jacqueline <me@jacqueline.id.au>
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*
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* SPDX-License-Identifier: GPL-3.0-only
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*/
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#include "display_init.hpp"
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namespace drivers {
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namespace displays {
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/* Bit to use to signify we should delay after part of an init sequence */
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const uint8_t kDelayBit = 0x80;
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// ST7735 commands and general format from the Adafruit library for these
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// displays. AFAICT it's the most complete implementation out there, and I
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// really don't want to have to derive this from the datasheet myself.
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// See https://github.com/adafruit/Adafruit-ST7735-Library/
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// clang-format off
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static const uint8_t kST7735RCommonHeader[]{
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15, // 15 commands in list:
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ST77XX_SWRESET, kDelayBit, // 1: Software reset, 0 args, w/delay
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150, // 150 ms delay
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ST77XX_SLPOUT, kDelayBit, // 2: Out of sleep mode, 0 args, w/delay
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255, // 500 ms delay
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ST7735_FRMCTR1, 3, // 3: Framerate ctrl - normal mode, 3 arg:
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0x01, 0x2C, 0x2D, // Rate = fosc/(1x2+40) * (LINE+2C+2D)
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ST7735_FRMCTR2, 3, // 4: Framerate ctrl - idle mode, 3 args:
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0x01, 0x2C, 0x2D, // Rate = fosc/(1x2+40) * (LINE+2C+2D)
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ST7735_FRMCTR3, 6, // 5: Framerate - partial mode, 6 args:
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0x01, 0x2C, 0x2D, // Dot inversion mode
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0x01, 0x2C, 0x2D, // Line inversion mode
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ST7735_INVCTR, 1, // 6: Display inversion ctrl, 1 arg:
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0x07, // No inversion
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ST7735_PWCTR1, 3, // 7: Power control, 3 args, no delay:
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0xA2,
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0x02, // -4.6V
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0x84, // AUTO mode
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ST7735_PWCTR2, 1, // 8: Power control, 1 arg, no delay:
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0xC5, // VGH25=2.4C VGSEL=-10 VGH=3 * AVDD
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ST7735_PWCTR3, 2, // 9: Power control, 2 args, no delay:
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0x0A, // Opamp current small
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0x00, // Boost frequency
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ST7735_PWCTR4, 2, // 10: Power control, 2 args, no delay:
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0x8A, // BCLK/2,
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0x2A, // opamp current small & medium low
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ST7735_PWCTR5, 2, // 11: Power control, 2 args, no delay:
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0x8A, 0xEE,
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ST7735_VMCTR1, 1, // 12: Power control, 1 arg, no delay:
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0x0E,
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ST77XX_INVOFF, 0, // 13: Don't invert display, no args
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ST77XX_MADCTL, 1, // 14: Mem access ctl (directions), 1 arg:
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0xA0, // row/col addr, bottom-top refresh
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ST77XX_COLMOD, 1, // 15: set color mode, 1 arg, no delay:
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0x05
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};
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// Commands to include for the variant of the panel that has a green pull tab on
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// the screen protector.
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static const uint8_t kST7735RCommonGreen[]{
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2, // 2 commands in list:
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ST77XX_CASET, 4, // 1: Column addr set, 4 args, no delay:
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0x00, 0x02, // XSTART = 0
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0x00, 0x7F+0x02, // XEND = 127
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ST77XX_RASET, 4, // 2: Row addr set, 4 args, no delay:
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0x00, 0x01, // XSTART = 0
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0x00, 0x9F+0x01};
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// Commands to include for the variant of the panel that has a red pull tab on
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// the screen protector.
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static const uint8_t kST7735RCommonRed[]{
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3, // 2 commands in list:
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ST77XX_CASET, 4, // 1: Column addr set, 4 args, no delay:
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0x00, 0x00, // XSTART = 0
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0x00, 0x7F, // XEND = 127
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ST77XX_RASET, 4, // 2: Row addr set, 4 args, no delay:
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0x00, 0x00, // XSTART = 0
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0x00, 0x9F,
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ST77XX_MADCTL, 1,
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0xC0,
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};
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static const uint8_t kST7735RCommonFooter[]{
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4, // 4 commands in list:
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ST7735_GMCTRP1, 16 , // 1: Gamma Adjustments (pos. polarity), 16 args + delay:
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0x02, 0x1c, 0x07, 0x12, // (Not entirely necessary, but provides
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0x37, 0x32, 0x29, 0x2d, // accurate colors)
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0x29, 0x25, 0x2B, 0x39,
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0x00, 0x01, 0x03, 0x10,
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ST7735_GMCTRN1, 16 , // 2: Gamma Adjustments (neg. polarity), 16 args + delay:
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0x03, 0x1d, 0x07, 0x06, // (Not entirely necessary, but provides
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0x2E, 0x2C, 0x29, 0x2D, // accurate colors)
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0x2E, 0x2E, 0x37, 0x3F,
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0x00, 0x00, 0x02, 0x10,
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ST77XX_NORON, kDelayBit, // 3: Normal display on, no args, w/delay
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10, // 10 ms delay
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ST77XX_DISPON, kDelayBit, // 4: Main screen turn on, no args w/delay
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100
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};
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// clang-format on
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const InitialisationData kST7735R = {
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.width = 160,
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.height = 128,
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.num_sequences = 3,
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.sequences = {kST7735RCommonHeader, kST7735RCommonGreen,
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kST7735RCommonFooter}};
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} // namespace displays
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} // namespace drivers
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