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84 lines
2.8 KiB
Markdown
84 lines
2.8 KiB
Markdown
# esp_lcd Driver Design
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## Class Diagram
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`esp_lcd` driver focuses on two parts: panel driver and IO driver. The panel driver is a bunch of operations on the **frame-buffer**, no matter where the frame-buffer is located. The IO driver is mainly consumed by the controller-based LCD panel drivers (e.g. ST7789). Usually such LCD controller can support various IO interfaces (e.g. I80, SPI, I2C, etc). So we define an abstract interface for the IO driver.
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```mermaid
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classDiagram
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class esp_lcd_panel_t {
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<<interface>>
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+reset() esp_err_t
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+init() esp_err_t
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+draw_bitmap(int x_start, int y_start, int x_end, int y_end, const void *color_data) esp_err_t
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+mirror(bool x_axis, bool y_axis) esp_err_t
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+swap_xy(bool swap_axes) esp_err_t
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+set_gap(int x_gap, int y_gap) esp_err_t
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+invert_color(bool invert_color_data) esp_err_t
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+disp_on_off(bool on_off) esp_err_t
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}
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esp_lcd_rgb_panel_t --|> esp_lcd_panel_t : Inheritance
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class esp_lcd_rgb_panel_t {
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-int panel_id
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-size_t data_width
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-int disp_gpio
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-intr_handle_t intr
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-uint8_t* frame_buffer
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-gdma_channel_handle_t gdma_channel
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-dma_descriptor_t* dma_nodes
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-on_vsync(void* user_data) bool
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}
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esp_lcd_panel_model_t --|> esp_lcd_panel_t : Inheritance
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esp_lcd_panel_model_t "1" --> "1" esp_lcd_panel_io_t : Use
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class esp_lcd_panel_model_t {
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-esp_lcd_panel_io_t* io
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-int reset_gpio_num
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}
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class esp_lcd_panel_io_t {
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<<interface>>
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+rx_param(int lcd_cmd, void *param, size_t param_size)
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+tx_param(int lcd_cmd, const void *param, size_t param_size)
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+tx_color(int lcd_cmd, const void *color, size_t color_size)
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}
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esp_lcd_panel_io_i2c_t --|> esp_lcd_panel_io_t : Inheritance
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class esp_lcd_panel_io_i2c_t {
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-int i2c_bus_id
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-int ctrl_phase_cmd
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-int ctrl_phase_data
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-on_color_trans_done(void* user_data) bool
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}
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esp_lcd_panel_io_spi_t --|> esp_lcd_panel_io_t : Inheritance
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class esp_lcd_panel_io_spi_t {
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-spi_device_handle_t spi_dev
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-int dc_gpio_num
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-spi_transaction_t trans_worker
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-on_color_trans_done(void* user_data) bool
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}
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esp_lcd_panel_io_i80_t --|> esp_lcd_panel_io_t : Inheritance
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class esp_lcd_panel_io_i80_t {
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-esp_lcd_i80_bus_t* bus
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-int cs_gpio_num
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-int dc_level
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-size_t pclk_hz
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-QueueHandle_t trans_queue
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-QueueHandle_t done_queue
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-on_color_trans_done(void* user_data) bool
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}
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esp_lcd_i80_bus_t "1" --> "1..*" esp_lcd_panel_io_i80_t : Has
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class esp_lcd_i80_bus_t {
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-int bus_id
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-size_t data_width
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-intr_handle_t intr
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-gdma_cannel_handle_t dma_chan
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-dma_descriptor_t* dma_nodes
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-list_t i80_devices
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}
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```
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