kopia lustrzana https://github.com/pimoroni/pimoroni-pico
119 wiersze
3.2 KiB
C++
119 wiersze
3.2 KiB
C++
#pragma once
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#include "hardware/spi.h"
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#include "hardware/gpio.h"
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#include "hardware/pwm.h"
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#include "common/pimoroni_common.hpp"
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#include "common/pimoroni_bus.hpp"
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#include <algorithm>
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namespace pimoroni {
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class ST7789 {
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spi_inst_t *spi = PIMORONI_SPI_DEFAULT_INSTANCE;
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public:
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// screen properties
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uint16_t width;
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uint16_t height;
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Rotation rotation;
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bool round;
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//--------------------------------------------------
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// Variables
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//--------------------------------------------------
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private:
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// interface pins with our standard defaults where appropriate
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uint cs;
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uint dc;
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uint wr_sck;
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uint rd_sck = PIN_UNUSED;
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uint d0;
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uint bl;
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uint vsync = PIN_UNUSED; // only available on some products
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// The ST7789 requires 16 ns between SPI rising edges.
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// 16 ns = 62,500,000 Hz
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static const uint32_t SPI_BAUD = 62'500'000;
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public:
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// frame buffer where pixel data is stored
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void *frame_buffer;
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// Parallel init
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ST7789(uint16_t width, uint16_t height, Rotation rotation, void *frame_buffer, ParallelPins pins) :
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spi(nullptr),
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width(width), height(height), rotation(rotation), round(false),
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cs(pins.cs), dc(pins.dc), wr_sck(pins.wr_sck), rd_sck(pins.rd_sck), d0(pins.d0), bl(pins.bl), frame_buffer(frame_buffer) {
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gpio_set_function(wr_sck, GPIO_FUNC_SIO);
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gpio_set_dir(wr_sck, GPIO_OUT);
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gpio_set_function(rd_sck, GPIO_FUNC_SIO);
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gpio_set_dir(rd_sck, GPIO_OUT);
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for(auto i = 0u; i < 8; i++) {
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gpio_set_function(d0 + i, GPIO_FUNC_SIO);
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gpio_set_dir(d0 + i, GPIO_OUT);
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}
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gpio_put(rd_sck, 1);
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common_init();
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}
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// Serial init
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ST7789(uint16_t width, uint16_t height, Rotation rotation, bool round, void *frame_buffer, SPIPins pins) :
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spi(pins.spi),
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width(width), height(height), rotation(rotation), round(round),
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cs(pins.cs), dc(pins.dc), wr_sck(pins.sck), d0(pins.mosi), bl(pins.bl), frame_buffer(frame_buffer) {
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// configure spi interface and pins
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spi_init(spi, SPI_BAUD);
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gpio_set_function(wr_sck, GPIO_FUNC_SPI);
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gpio_set_function(d0, GPIO_FUNC_SPI);
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common_init();
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}
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void init();
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void command(uint8_t command, size_t len = 0, const char *data = NULL);
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void set_backlight(uint8_t brightness);
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void update();
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void update(uint16_t *palette);
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private:
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void configure_display(Rotation rotate);
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void write_blocking_parallel(const uint8_t *src, size_t len);
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void common_init() {
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if(!this->frame_buffer) {
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this->frame_buffer = new uint8_t[width * height];
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}
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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 a backlight pin is provided then set it up for
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// pwm control
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if(bl != PIN_UNUSED) {
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pwm_config cfg = pwm_get_default_config();
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pwm_set_wrap(pwm_gpio_to_slice_num(bl), 65535);
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pwm_init(pwm_gpio_to_slice_num(bl), &cfg, true);
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gpio_set_function(bl, GPIO_FUNC_PWM);
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set_backlight(0); // Turn backlight off initially to avoid nasty surprises
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}
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}
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};
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}
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