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Diffstat (limited to 'src/drivers/display_init.cpp')
| -rw-r--r-- | src/drivers/display_init.cpp | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/src/drivers/display_init.cpp b/src/drivers/display_init.cpp new file mode 100644 index 00000000..e66d6a47 --- /dev/null +++ b/src/drivers/display_init.cpp @@ -0,0 +1,103 @@ +#include "display_init.hpp" + +namespace drivers { +namespace displays { + +/* Bit to use to signify we should delay after part of an init sequence */ +const uint8_t kDelayBit = 0x80; + +// ST7735 commands and general format from the Adafruit library for these +// displays. AFAICT it's the most complete implementation out there, and I +// really don't want to have to derive this from the datasheet myself. +// See https://github.com/adafruit/Adafruit-ST7735-Library/ + +// clang-format off +static const uint8_t kST7735RCommonHeader[]{ + 15, // 15 commands in list: + ST77XX_SWRESET, kDelayBit, // 1: Software reset, 0 args, w/delay + 150, // 150 ms delay + ST77XX_SLPOUT, kDelayBit, // 2: Out of sleep mode, 0 args, w/delay + 255, // 500 ms delay + ST7735_FRMCTR1, 3, // 3: Framerate ctrl - normal mode, 3 arg: + 0x01, 0x2C, 0x2D, // Rate = fosc/(1x2+40) * (LINE+2C+2D) + ST7735_FRMCTR2, 3, // 4: Framerate ctrl - idle mode, 3 args: + 0x01, 0x2C, 0x2D, // Rate = fosc/(1x2+40) * (LINE+2C+2D) + ST7735_FRMCTR3, 6, // 5: Framerate - partial mode, 6 args: + 0x01, 0x2C, 0x2D, // Dot inversion mode + 0x01, 0x2C, 0x2D, // Line inversion mode + ST7735_INVCTR, 1, // 6: Display inversion ctrl, 1 arg: + 0x07, // No inversion + ST7735_PWCTR1, 3, // 7: Power control, 3 args, no delay: + 0xA2, + 0x02, // -4.6V + 0x84, // AUTO mode + ST7735_PWCTR2, 1, // 8: Power control, 1 arg, no delay: + 0xC5, // VGH25=2.4C VGSEL=-10 VGH=3 * AVDD + ST7735_PWCTR3, 2, // 9: Power control, 2 args, no delay: + 0x0A, // Opamp current small + 0x00, // Boost frequency + ST7735_PWCTR4, 2, // 10: Power control, 2 args, no delay: + 0x8A, // BCLK/2, + 0x2A, // opamp current small & medium low + ST7735_PWCTR5, 2, // 11: Power control, 2 args, no delay: + 0x8A, 0xEE, + ST7735_VMCTR1, 1, // 12: Power control, 1 arg, no delay: + 0x0E, + ST77XX_INVOFF, 0, // 13: Don't invert display, no args + ST77XX_MADCTL, 1, // 14: Mem access ctl (directions), 1 arg: + 0xC8, // row/col addr, bottom-top refresh + ST77XX_COLMOD, 1, // 15: set color mode, 1 arg, no delay: + 0x05 +}; + +// Commands to include for the variant of the panel that has a green pull tab on +// the screen protector. +static const uint8_t kST7735RCommonGreen[]{ + 2, // 2 commands in list: + ST77XX_CASET, 4, // 1: Column addr set, 4 args, no delay: + 0x00, 0x02, // XSTART = 0 + 0x00, 0x7F+0x02, // XEND = 127 + ST77XX_RASET, 4, // 2: Row addr set, 4 args, no delay: + 0x00, 0x01, // XSTART = 0 + 0x00, 0x9F+0x01}; + +// Commands to include for the variant of the panel that has a red pull tab on +// the screen protector. +static const uint8_t kST7735RCommonRed[]{ + 3, // 2 commands in list: + ST77XX_CASET, 4, // 1: Column addr set, 4 args, no delay: + 0x00, 0x00, // XSTART = 0 + 0x00, 0x7F, // XEND = 127 + ST77XX_RASET, 4, // 2: Row addr set, 4 args, no delay: + 0x00, 0x00, // XSTART = 0 + 0x00, 0x9F, + ST77XX_MADCTL, 1, + 0xC0, +}; + +static const uint8_t kST7735RCommonFooter[]{ + 4, // 4 commands in list: + ST7735_GMCTRP1, 16 , // 1: Gamma Adjustments (pos. polarity), 16 args + delay: + 0x02, 0x1c, 0x07, 0x12, // (Not entirely necessary, but provides + 0x37, 0x32, 0x29, 0x2d, // accurate colors) + 0x29, 0x25, 0x2B, 0x39, + 0x00, 0x01, 0x03, 0x10, + ST7735_GMCTRN1, 16 , // 2: Gamma Adjustments (neg. polarity), 16 args + delay: + 0x03, 0x1d, 0x07, 0x06, // (Not entirely necessary, but provides + 0x2E, 0x2C, 0x29, 0x2D, // accurate colors) + 0x2E, 0x2E, 0x37, 0x3F, + 0x00, 0x00, 0x02, 0x10, + ST77XX_NORON, kDelayBit, // 3: Normal display on, no args, w/delay + 10, // 10 ms delay + ST77XX_DISPON, kDelayBit, // 4: Main screen turn on, no args w/delay + 100 +}; +// clang-format on + +const InitialisationData kST7735R = { + .num_sequences = 3, + .sequences = {kST7735RCommonHeader, kST7735RCommonRed, + kST7735RCommonFooter}}; + +} // namespace displays +} // namespace drivers |