esp-idf/components/esp_lcd/README.md

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# esp_lcd Driver Design
## Class Diagram
`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.
```mermaid
classDiagram
class esp_lcd_panel_t {
<<interface>>
+reset() esp_err_t
+init() esp_err_t
+draw_bitmap(int x_start, int y_start, int x_end, int y_end, const void *color_data) esp_err_t
+mirror(bool x_axis, bool y_axis) esp_err_t
+swap_xy(bool swap_axes) esp_err_t
+set_gap(int x_gap, int y_gap) esp_err_t
+invert_color(bool invert_color_data) esp_err_t
+disp_on_off(bool on_off) esp_err_t
}
esp_lcd_rgb_panel_t --|> esp_lcd_panel_t : Inheritance
class esp_lcd_rgb_panel_t {
-int panel_id
-size_t data_width
-int disp_gpio
-intr_handle_t intr
-uint8_t* frame_buffer
-gdma_channel_handle_t gdma_channel
-dma_descriptor_t* dma_nodes
-on_vsync(void* user_data) bool
}
esp_lcd_panel_model_t --|> esp_lcd_panel_t : Inheritance
esp_lcd_panel_model_t "1" --> "1" esp_lcd_panel_io_t : Use
class esp_lcd_panel_model_t {
-esp_lcd_panel_io_t* io
-int reset_gpio_num
}
class esp_lcd_panel_io_t {
<<interface>>
+rx_param(int lcd_cmd, void *param, size_t param_size)
+tx_param(int lcd_cmd, const void *param, size_t param_size)
+tx_color(int lcd_cmd, const void *color, size_t color_size)
}
esp_lcd_panel_io_i2c_t --|> esp_lcd_panel_io_t : Inheritance
class esp_lcd_panel_io_i2c_t {
-int i2c_bus_id
-int ctrl_phase_cmd
-int ctrl_phase_data
-on_color_trans_done(void* user_data) bool
}
esp_lcd_panel_io_spi_t --|> esp_lcd_panel_io_t : Inheritance
class esp_lcd_panel_io_spi_t {
-spi_device_handle_t spi_dev
-int dc_gpio_num
-spi_transaction_t trans_worker
-on_color_trans_done(void* user_data) bool
}
esp_lcd_panel_io_i80_t --|> esp_lcd_panel_io_t : Inheritance
class esp_lcd_panel_io_i80_t {
-esp_lcd_i80_bus_t* bus
-int cs_gpio_num
-int dc_level
-size_t pclk_hz
-QueueHandle_t trans_queue
-QueueHandle_t done_queue
-on_color_trans_done(void* user_data) bool
}
esp_lcd_i80_bus_t "1" --> "1..*" esp_lcd_panel_io_i80_t : Has
class esp_lcd_i80_bus_t {
-int bus_id
-size_t data_width
-intr_handle_t intr
-gdma_cannel_handle_t dma_chan
-dma_descriptor_t* dma_nodes
-list_t i80_devices
}
```