kopia lustrzana https://github.com/pimoroni/pimoroni-pico
131 wiersze
4.0 KiB
C++
131 wiersze
4.0 KiB
C++
#pragma once
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#include "hardware/spi.h"
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#include "hardware/dma.h"
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#include "hardware/gpio.h"
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#include "hardware/pio.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 "libraries/pico_graphics/pico_graphics.hpp"
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#include "st7789_parallel.pio.h"
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#include <algorithm>
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namespace pimoroni {
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class ST7789 : public DisplayDriver {
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spi_inst_t *spi = PIMORONI_SPI_DEFAULT_INSTANCE;
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public:
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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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uint parallel_sm;
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PIO parallel_pio;
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uint parallel_offset;
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uint parallel_dma;
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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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// Parallel init
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ST7789(uint16_t width, uint16_t height, Rotation rotation, ParallelPins pins) :
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DisplayDriver(width, height, rotation),
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spi(nullptr), 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) {
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parallel_pio = pio1;
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parallel_sm = pio_claim_unused_sm(parallel_pio, true);
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parallel_offset = pio_add_program(parallel_pio, &st7789_parallel_program);
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//gpio_init(wr_sck);
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//gpio_set_dir(wr_sck, GPIO_OUT);
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//gpio_set_function(wr_sck, GPIO_FUNC_SIO);
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pio_gpio_init(parallel_pio, wr_sck);
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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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//gpio_init(d0 + 0); gpio_set_dir(d0 + i, GPIO_OUT);
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pio_gpio_init(parallel_pio, d0 + i);
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}
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pio_sm_set_consecutive_pindirs(parallel_pio, parallel_sm, d0, 8, true);
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pio_sm_set_consecutive_pindirs(parallel_pio, parallel_sm, wr_sck, 1, true);
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pio_sm_config c = st7789_parallel_program_get_default_config(parallel_offset);
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sm_config_set_out_pins(&c, d0, 8);
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sm_config_set_sideset_pins(&c, wr_sck);
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sm_config_set_fifo_join(&c, PIO_FIFO_JOIN_TX);
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sm_config_set_out_shift(&c, false, true, 8);
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sm_config_set_clkdiv(&c, 4);
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pio_sm_init(parallel_pio, parallel_sm, parallel_offset, &c);
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pio_sm_set_enabled(parallel_pio, parallel_sm, true);
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parallel_dma = dma_claim_unused_channel(true);
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dma_channel_config config = dma_channel_get_default_config(parallel_dma);
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channel_config_set_transfer_data_size(&config, DMA_SIZE_8);
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channel_config_set_bswap(&config, false);
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channel_config_set_dreq(&config, pio_get_dreq(parallel_pio, parallel_sm, true));
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dma_channel_configure(parallel_dma, &config, ¶llel_pio->txf[parallel_sm], NULL, 0, false);
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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, SPIPins pins) :
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DisplayDriver(width, height, rotation),
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spi(pins.spi), round(round),
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cs(pins.cs), dc(pins.dc), wr_sck(pins.sck), d0(pins.mosi), bl(pins.bl) {
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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 cleanup() override;
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void update(PicoGraphics *graphics) override;
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void set_backlight(uint8_t brightness) override;
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private:
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void common_init();
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void configure_display(Rotation rotate);
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void write_blocking_parallel_dma(const uint8_t *src, size_t len);
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void write_blocking_parallel(const uint8_t *src, size_t len);
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void command(uint8_t command, size_t len = 0, const char *data = NULL);
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};
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}
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