# lv_draw_eve_target.h (/api/draw/eve/lv_draw_eve_target_h)



<ApiSummary enums="1" structs="1" typedefs="1" />

Enums [#enums]

<ApiMember kind="enum" name="lv_draw_eve_operation_t" file="draw/eve/lv_draw_eve_target.h" line="45" url="https://github.com/lvgl/lvgl/tree/a7b95c5b0839ce901c09c205610bc2c77cc3345d/src/draw/eve/lv_draw_eve_target.h#L45">
  lv_draw_eve_operation_t [#lv_draw_eve_operation_t]

  | Name                                    | Description                                 |
  | --------------------------------------- | ------------------------------------------- |
  | `LV_DRAW_EVE_OPERATION_POWERDOWN_SET`   | set the "PD\_N" pin low                     |
  | `LV_DRAW_EVE_OPERATION_POWERDOWN_CLEAR` | set the "PD\_N" pin high                    |
  | `LV_DRAW_EVE_OPERATION_CS_ASSERT`       | set the "CS\_N" pin low                     |
  | `LV_DRAW_EVE_OPERATION_CS_DEASSERT`     | set the "CS\_N" pin high                    |
  | `LV_DRAW_EVE_OPERATION_SPI_SEND`        | send `length` bytes of `data` over SPI      |
  | `LV_DRAW_EVE_OPERATION_SPI_RECEIVE`     | receive `length` bytes into `data` from SPI |
</ApiMember>

Structs [#structs]

<ApiMember kind="struct" name="lv_draw_eve_parameters_t">
  lv_draw_eve_parameters_t [#lv_draw_eve_parameters_t]

  | Member           | Type                        | Description                                                                                |
  | ---------------- | --------------------------- | ------------------------------------------------------------------------------------------ |
  | `hor_res`        | <ApiLink name="uint16_t" /> | active display width                                                                       |
  | `ver_res`        | <ApiLink name="uint16_t" /> | active display height                                                                      |
  | `hcycle`         | <ApiLink name="uint16_t" /> | total number of clocks per line, incl front/back porch                                     |
  | `hoffset`        | <ApiLink name="uint16_t" /> | start of active line                                                                       |
  | `hsync0`         | <ApiLink name="uint16_t" /> | start of horizontal sync pulse                                                             |
  | `hsync1`         | <ApiLink name="uint16_t" /> | end of horizontal sync pulse                                                               |
  | `vcycle`         | <ApiLink name="uint16_t" /> | total number of lines per screen, including pre/post                                       |
  | `voffset`        | <ApiLink name="uint16_t" /> | start of active screen                                                                     |
  | `vsync0`         | <ApiLink name="uint16_t" /> | start of vertical sync pulse                                                               |
  | `vsync1`         | <ApiLink name="uint16_t" /> | end of vertical sync pulse                                                                 |
  | `swizzle`        | <ApiLink name="uint8_t" />  | FT8xx output to LCD - pin order                                                            |
  | `pclkpol`        | <ApiLink name="uint8_t" />  | LCD data is clocked in on this PCLK edge                                                   |
  | `cspread`        | <ApiLink name="uint8_t" />  | helps with noise, when set to 1 fewer signals are changed simultaneously, reset-default: 1 |
  | `pclk`           | <ApiLink name="uint8_t" />  | 60MHz / pclk = pclk frequency                                                              |
  | `has_crystal`    | <ApiLink name="bool" />     | has an external clock crystal                                                              |
  | `has_gt911`      | <ApiLink name="bool" />     | has a touch controller                                                                     |
  | `backlight_pwm`  | <ApiLink name="uint8_t" />  | backlight PWM duty cycle 0 = off, 128 = max                                                |
  | `backlight_freq` | <ApiLink name="uint16_t" /> | backlight PWM frequency. try 4000 if unsure                                                |
</ApiMember>

<TypeUsedBy name="lv_draw_eve_parameters_t" count="2">
  * `lv_draw_eve_set_display_data` — param `params`
  * `lv_draw_eve_display_create` — param `params`
</TypeUsedBy>

Typedefs [#typedefs]

<ApiMember kind="typedef" name="lv_draw_eve_operation_cb_t" file="draw/eve/lv_draw_eve_target.h" line="54" url="https://github.com/lvgl/lvgl/tree/a7b95c5b0839ce901c09c205610bc2c77cc3345d/src/draw/eve/lv_draw_eve_target.h#L54">
  lv_draw_eve_operation_cb_t [#lv_draw_eve_operation_cb_t]

  ```c title=" " lineNumbers=1
  typedef void(* lv_draw_eve_operation_cb_t) (lv_display_t *disp, lv_draw_eve_operation_t operation, void *data, uint32_t length)
  ```
</ApiMember>

<TypeUsedBy name="lv_draw_eve_operation_cb_t" count="2">
  * `lv_draw_eve_set_display_data` — param `op_cb`
  * `lv_draw_eve_display_create` — param `op_cb`
</TypeUsedBy>

Dependencies [#dependencies]

<FileIncludes includes="[&#x22;lv_conf_internal.h&#x22;, &#x22;lv_types.h&#x22;, &#x22;stdbool.h&#x22;, &#x22;stdint.h&#x22;]" includedBy="[&#x22;lv_draw_eve.h&#x22;, &#x22;lv_draw_eve_private.h&#x22;, &#x22;lv_draw_eve_display.h&#x22;]" transitiveIncludes="[&#x22;lv_conf_kconfig.h&#x22;]" />