text: /**
   * @file il3820.h
   *
   */
  
  #ifndef IL3820_H
  #define IL3820_H
  
  #ifdef __cplusplus
  extern "C"
  {
  #endif
  
  #ifdef LV_LVGL_H_INCLUDE_SIMPLE
  #include "lvgl.h"
  #else
  #include "lvgl/lvgl.h"
  #endif
  #include "sdkconfig.h"
  
  /* Values for Waveshare 2.9inch e-Paper Module, this values shouldn't be
   * swapped to change display orientation */
  #if defined (LV_HOR_RES_MAX)
  #define EPD_PANEL_WIDTH         LV_HOR_RES_MAX   /* 128 */
  #else
      /* Fallback to default value */
  #define EPD_PANEL_WIDTH         128u
  #endif
  
  #if defined (LV_VER_RES_MAX)
  #define EPD_PANEL_HEIGHT        LV_VER_RES_MAX  /* 296 */
  #else
      /* Fallback to default value */
  #define EPD_PANEL_HEIGHT        296u
  #endif
  
  /* 128 = panel width */
  #define IL3820_COLUMNS          (EPD_PANEL_WIDTH / 8)
  
  #define IL3820_DC_PIN           CONFIG_LV_DISP_PIN_DC
  #define IL3820_RST_PIN          CONFIG_LV_DISP_PIN_RST
  #define IL3820_USE_RST          CONFIG_LV_DISP_USE_RST
  #define IL3820_BUSY_PIN         CONFIG_LV_DISP_PIN_BUSY
  #define IL3820_BUSY_LEVEL       1
  
  /* IL3820 commands */
  #define IL3820_CMD_GDO_CTRL			0x01
  #define IL3820_CMD_GDV_CTRL			0x03
  #define IL3820_CMD_SDV_CTRL			0x04
  #define IL3820_CMD_SOFTSTART			0x0c
  #define IL3820_CMD_GSCAN_START			0x0f
  #define IL3820_CMD_SLEEP_MODE			0x10
  #define IL3820_CMD_ENTRY_MODE			0x11
  #define IL3820_CMD_SW_RESET			0x12
  #define IL3820_CMD_TSENS_CTRL			0x1a
  #define IL3820_CMD_MASTER_ACTIVATION		0x20
  #define IL3820_CMD_UPDATE_CTRL1		0x21
  #define IL3820_CMD_UPDATE_CTRL2		0x22
  #define IL3820_CMD_WRITE_RAM			0x24
  #define IL3820_CMD_WRITE_RED_RAM		0x26
  #define IL3820_CMD_VCOM_SENSE			0x28
  #define IL3820_CMD_VCOM_SENSE_DURATON		0x29
  #define IL3820_CMD_PRGM_VCOM_OTP		0x2a
  #define IL3820_CMD_VCOM_VOLTAGE		0x2c
  #define IL3820_CMD_PRGM_WS_OTP			0x30
  #define IL3820_CMD_UPDATE_LUT			0x32
  #define IL3820_CMD_PRGM_OTP_SELECTION		0x36
  #define IL3820_CMD_OTP_SELECTION_CTRL		0x37
  #define IL3820_CMD_DUMMY_LINE			0x3a
  #define IL3820_CMD_GATE_LINE_WIDTH		0x3b
  #define IL3820_CMD_BWF_CTRL			0x3c
  #define IL3820_CMD_RAM_XPOS_CTRL		0x44
  #define IL3820_CMD_RAM_YPOS_CTRL		0x45
  #define IL3820_CMD_RAM_XPOS_CNTR		0x4e
  #define IL3820_CMD_RAM_YPOS_CNTR		0x4f
  #define IL3820_CMD_TERMINATE_FRAME_RW  0xff
  
  /* Data entry sequence modes */
  #define IL3820_DATA_ENTRY_MASK			0x07
  #define IL3820_DATA_ENTRY_XDYDX		0x00
  #define IL3820_DATA_ENTRY_XIYDX		0x01
  #define IL3820_DATA_ENTRY_XDYIX		0x02
  #define IL3820_DATA_ENTRY_XIYIX		0x03
  #define IL3820_DATA_ENTRY_XDYDY		0x04
  #define IL3820_DATA_ENTRY_XIYDY		0x05
  #define IL3820_DATA_ENTRY_XDYIY		0x06
  #define IL3820_DATA_ENTRY_XIYIY		0x07
  
  /* Options for display update */
  #define IL3820_CTRL1_INITIAL_UPDATE_LL		0x00
  #define IL3820_CTRL1_INITIAL_UPDATE_LH		0x01
  #define IL3820_CTRL1_INITIAL_UPDATE_HL		0x02
  #define IL3820_CTRL1_INITIAL_UPDATE_HH		0x03
  
  /* Options for display update sequence */
  #define IL3820_CTRL2_ENABLE_CLK		0x80
  #define IL3820_CTRL2_ENABLE_ANALOG		0x40
  #define IL3820_CTRL2_TO_INITIAL		0x08
  #define IL3820_CTRL2_TO_PATTERN		0x04
  #define IL3820_CTRL2_DISABLE_ANALOG	0x02
  #define IL3820_CTRL2_DISABLE_CLK		0x01
  
  #define IL3820_SLEEP_MODE_DSM			0x01
  #define IL3820_SLEEP_MODE_PON			0x00
  
  /* time constants in ms */
  #define IL3820_RESET_DELAY			20
  #define IL3820_BUSY_DELAY			1
  // normal wait time max 200ms
  #define IL3820_WAIT                20
  
  void il3820_init(void);
  void il3820_flush(lv_disp_drv_t *drv, const lv_area_t *area, lv_color_t *color_map);
  void il3820_fullflush(lv_disp_drv_t *drv, const lv_area_t *area, lv_color_t *color_map);
  void il3820_rounder(lv_disp_drv_t * disp_drv, lv_area_t *area);
  void il3820_set_px_cb(lv_disp_drv_t * disp_drv, uint8_t * buf, lv_coord_t buf_w, lv_coord_t x, lv_coord_t y, lv_color_t color, lv_opa_t opa);
  void il3820_sleep_in(void);
  
  #ifdef __cplusplus
  } /* extern "C" */
  #endif
  
  
  #endif /* __IL3820_REGS_H__ */
  
  