LCD panel IO handle, which is created by other factory API like `esp_lcd_new_panel_io_spi()`
lcd_cmd
The specific LCD command, set to -1 if no command needed
param
Buffer for the command data
param_size
Size of `param` buffer
Return value
- ESP_ERR_INVALID_ARG if parameter is invalid - ESP_ERR_NOT_SUPPORTED if read is not supported by transport - ESP_OK on success
Notes
Commands sent by this function are short, so they are sent using polling transactions. The function does not return before the command transfer is completed. If any queued transactions sent by `esp_lcd_panel_io_tx_color()` are still pending when this function is called, this function will wait until they are finished and the queue is empty before sending the command(s).