kopia lustrzana https://github.com/pimoroni/pimoroni-pico
ST7789 driver
Jonathan Williamson
rodzic
88ceb123b4
commit
cf86122d56
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@ -0,0 +1,151 @@
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#include "st7789.hpp"
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#include "hardware/dma.h"
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namespace pimoroni {
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void ST7789::init() {
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spi_init(spi, spi_baud);
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gpio_set_function(dc, GPIO_FUNC_SIO);
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gpio_set_dir(dc, GPIO_OUT);
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gpio_set_function(cs, GPIO_FUNC_SIO);
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gpio_set_dir(cs, GPIO_OUT);
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// if framesync is enabled then the fs pin is toggled
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// high during vsync
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if(vsync != -1) {
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gpio_set_function(fs, GPIO_FUNC_SIO);
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gpio_set_dir(fs, GPIO_IN);
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gpio_set_pulls(fs, false, true)
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}
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// if a backlight pin is provided then set it up for
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// pwm control
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if(bl != -1) {
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pwm_config cfg = pwm_get_default_config();
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pwm_config_wrap(&cfg, 65535);
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pwm_init(pwm_gpio_to_slice(bl), &cfg, true);
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gpio_set_function(bl, GPIO_FUNC_PWM);
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}
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gpio_set_function(sck, GPIO_FUNC_SPI);
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gpio_set_function(mosi, GPIO_FUNC_SPI);
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if(miso != -1) {
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gpio_set_function(miso, GPIO_FUNC_SPI);
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}
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// initialise dma channel for transmitting pixel data to screen
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dma_channel = dma_claim_unused_channel(true);
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dma_channel_config config = dma_channel_get_default_config(dma_channel);
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//channel_config_set_bswap(&config, true); // byte swap to reverse little endian
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dma_channel_configure(
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dma_channel,
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&config,
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&spi_get_hw(spi)->dr,
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buffer,
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sizeof(uint16_t) * width * height,
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false);
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}
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void ST7789::init_240x240() {
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init();
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width = 240;
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height = 240;
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row_stride = width * sizeof(uint16_t);
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// only initialise the buffer if one hasn't been supplied
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if(!buffer) {
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buffer = malloc(sizeof(uint16_t) * width * height);
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}
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// initialise our standard 240x240 LCD as 16-bit colour
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// with an RGB subpixel element order.
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command(register::SWRESET);
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sleep_ms(150);
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command(register::MADCTL, 1, "\x04"); // row/column addressing order - rgb pixel order
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command(register::TEON, 1, "\x00"); // enable frame sync signal if used
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command(register::COLMOD, 1, "\x05"); // 16 bits per pixel
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command(register::SLPOUT); // leave sleep mode
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command(register::DISPON); // turn display on
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sleep_ms(100);
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// set writing "window" to the full display
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command(register::CASET, 4, "\x00\x00\x00\xef"); // 0 .. 239 columns
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command(register::RASET, 4, "\x00\x00\x00\xef"); // 0 .. 239 rows
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// put into write mode
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command(register::RAMWR);
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}
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void ST7789::init_240x135() {
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init();
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width = 240;
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height = 135;
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row_stride = width * sizeof(uint16_t);
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// only initialise the buffer if one hasn't been supplied
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if(!buffer) {
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buffer = malloc(sizeof(uint16_t) * width * height);
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}
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// initialise our standard 240x135 LCD as 16-bit colour
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// with an RGB subpixel element order.
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command(register::SWRESET);
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sleep_ms(150);
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command(register::MADCTL, 1, "\x70");
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command(register::COLMOD, 1, "\x05");
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command(register::SLPOUT); // leave sleep mode
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command(register::DISPON); // turn display on
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sleep_ms(100);
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command(register::RASET, 4, "\x00\x35\x00\xbb"); // 53 .. 187 (135 rows)
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command(register::CASET, 4, "\x00\x28\x01\x17"); // 40 .. 279 (240 columns)
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}
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void ST7789::command(uint8_t command, size_t len = 0, const char *data = NULL) {
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gpio_put(pin::CS, 0);
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gpio_put(pin::DC, 0); // command mode
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spi_write_blocking(spi0, &command, 1);
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if(data) {
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gpio_put(pin::DC, 1); // data mode
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spi_write_blocking(spi0, (const uint8_t*)data, len);
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}
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gpio_put(pin::CS, 1);
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}
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void ST7789::update() {
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dma_channel_wait_for_finish_blocking(dma_channel);
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command(register::RAMWR);
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dma_channel_start(dma_channel);
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}
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void ST7789::set_backlight(uint8_t brightness) {
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// gamma correct the provided 0-255 brightness value onto a
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// 0-65535 range for the pwm counter
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float gamma = 2.8;
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uint16_t value = (uint16_t)(pow((float)(brightness) / 255.0f, gamma) * 65536.0f + 0.5f);
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pwm_set_gpio_level(bl, value);
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}
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void ST7789::vsync_callback(gpio_irq_callback_t callback) {
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gpio_set_irq_enabled_with_callback(vsync, GPIO_IRQ_EDGE_RISE, true, &callback);
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}
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}
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#pragma once
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#include "hardware/spi.h"
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namespace pimoroni {
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class ST7789 {
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spi_inst_t *spi = spi0_hw;
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// framebuffer for storing pixel data
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uint16_t *buffer;
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uint32_t dma_channel;
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// screen properties
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uint16_t width;
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uint16_t height;
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uint16_t row_stride;
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// interface pins with our standard defaults where appropriate
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int8_t sck = 18;
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int8_t mosi = 19;
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int8_t miso = -1; // we generally don't use this pin
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int8_t cs = 17;
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int8_t dc = 16;
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int8_t bl = 20;
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int8_t vsync = -1; // only available on some products
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uint32_t spi_baud = 64 * 1024 * 1024;
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public:
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ST7789(spi_inst_t *spi, uint8_t cs, uint8_t dc, uint8_t sck, uint8_t mosi, uint8_t miso = -1) :
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spi(spi), cs(cs), dc(dc), sck(sck), mosi(mosi), miso(miso) {}
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void init();
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void init_240x240();
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void init_240x235();
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void vsync_callback(gpio_irq_callback_t callback);
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void update();
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uint16_t pen(uint8_t r, uint8_t g, uint8_t b);
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enum register {
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SWRESET = 0x01,
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TEON = 0x35,
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MADCTL = 0x36,
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COLMOD = 0x3A,
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GCTRL = 0xB7,
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VCOMS = 0xBB,
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LCMCTRL = 0xC0,
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VDVVRHEN = 0xC2,
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VRHS = 0xC3,
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VDVS = 0xC4,
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FRCTRL2 = 0xC6,
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PWRCTRL1 = 0xD0,
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FRMCTR1 = 0xB1,
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FRMCTR2 = 0xB2,
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GMCTRP1 = 0xE0,
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GMCTRN1 = 0xE1,
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INVOFF = 0x20,
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SLPOUT = 0x11,
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DISPON = 0x29,
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GAMSET = 0x26,
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DISPOFF = 0x28,
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RAMWR = 0x2C,
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INVON = 0x21,
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CASET = 0x2A,
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RASET = 0x2B
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};
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};
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}
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