* Set the length of the tick marks on the y axis * @param chart pointer to the chart * @param major_tick_len the length of the major tick or `LV_CHA

* Get style of a color_picker. * @param cpicker pointer to color_picker object * @param type which style should be get * @return style pointer to t

* Draw an image * @param coords the coordinates of the image * @param mask the image will be drawn only in this area * @param src pointer to a lv_c

* Create a gauge objects * @param par pointer to an object, it will be the parent of the new gauge * @param copy pointer to a gauge object, if not N

* Set the value of a needle * @param gauge pointer to a gauge * @param needle_id the id of the needle * @param value the new value */

* Send a control character to the focuses object of a group * @param group pointer to a group * @param c a character (use LV_KEY_.. to navigate) *

* Set the color of a pixel of an image. The alpha channel won't be affected. * @param dsc pointer to an image descriptor * @param x x coordinate of

* Create a keyboard objects * @param par pointer to an object, it will be the parent of the new keyboard * @param copy pointer to a keyboard object,

* Insert a text to the label. The label text can not be static. * @param label pointer to a label object * @param pos character index to insert. Exp

* Light off a LED * @param led pointer to a LED object */

* Set the style of a led * @param led pointer to a led object * @param type which style should be set (can be only `LV_LED_STYLE_MAIN`) * @param st

* Set a new value on the line meter * @param lmeter pointer to a line meter object * @param value new value */

* Set the options on a roller * @param roller pointer to roller object * @param options a string with '\n' separated options. E.g. "One\nTwo\nThree"

* Get a style of a slider * @param slider pointer to a slider object * @param type which style should be get * @return style pointer to a style */

* Get the value of a slider * @param slider pointer to a slider object * @return the value of the slider */

* Clear the selection on the text area. * @param ta Text area object */

* Get the current cursor type. * @param ta pointer to a text area object * @return element of 'lv_ta_cursor_type_t' */

* Delete a lv_task * @param task pointer to task created by task */

* Get the next line of text. Check line length and break chars too. * * A line of txt includes the \n character. * * @param txt a '\0' terminated

* @brief 获取单片机自上电以来经过的微秒数 * @param 无 * @retval 当前系统时钟微秒数 */

* Hide all characters (convert them to '*') * @param ta: pointer to text area object */

* Refresh the position of the roller. It uses the id stored in: ext->ddlist.selected_option_id * @param roller pointer to a roller object * @param a

* Realign and resize the elements of Tab view * @param tabview pointer to a Tab view object */

* @brief Writes/upadtes variable data in EEPROM. The value is written only if differs from the one already saved at the same address. *

* @brief Generic DSI packet header configuration * @param DSIx: Pointer to DSI register base * @param ChannelID: Virtual channel ID of the head

* @brief Forces or releases AHB2 peripheral reset. * @param RCC_AHB2Periph: specifies the AHB2 peripheral to reset. * This parameter ca

* @brief Exits the RTC Initialization mode. * @note When the initialization sequence is complete, the calendar restarts * counting aft

internal itoa for 'long' type

* Read bits from an input buffer. The read can cross byte boundary. * @param in the input buffer to read from. * @param bit_pos index of teh first b

* Get the day of the week * @param year a year * @param month a month * @param day a day * @return [0..6] which means [Sun..Sat] */

* Convert a hexadecimal characters to a number (0..15) * @param hex Pointer to a hexadecimal character (0..9, A..F) * @return the numerical value of

* Create a arc object * @param par pointer to an object, it will be the parent of the new arc * @param copy pointer to a arc object, if not NULL the

* Calculate the atan2 of a vector. * @param x * @param y * @return the angle in degree calculated from the given parameters in range of [0..360] *

* Get a style of a bar * @param bar pointer to a bar object * @param type which style should be get * @return style pointer to a style */

* Set the text of a check box. `txt` will be copied and may be deallocated * after this function returns. * @param cb pointer to a check box * @par

* Set the minimal and maximal y values * @param chart pointer to a graph background object * @param ymin y minimum value * @param ymax y maximum va

* Set the length of the tick marks on the x axis * @param chart pointer to the chart * @param major_tick_len the length of the major tick or `LV_CHA

* Set the x-axis tick count and labels of a chart * @param chart pointer to a chart object * @param list_of_values list of string values, termin

* Set the position of list when it is closed to show the selected item * @param ddlist pointer to a drop down list */

* Return with the sys. layer. (Same on every screen and it is above the normal screen and the top * layer) * @param disp pointer to display which sy

* Make a screen active * @param scr pointer to a screen */

* Give a pointer to a driver from its letter * @param letter the driver letter * @return pointer to a driver or NULL if not found */

* Get information about an image. * Try the created image decoder one by one. Once one is able to get info that info will be used. * @param src the

* Set images for a state of the image button * @param imgbtn pointer to an image button object * @param state for which state set the new image (fro

* Get the index of letter on a relative point of a label * @param label pointer to label object * @param pos pointer to point with coordinates on a

* Return with tail node of the linked list * @param ll_p pointer to linked list * @return pointer to the head of 'll_p' */

* Clear a bit or bits in the protect filed * @param obj pointer to an object * @param prot 'OR'-ed values from `lv_protect_t` */

* Get that width reduced by the left and right padding. * @param obj pointer to an object * @return the width which still fits into the container *

* Get the animation time * @param page pointer to a page object * @return the animation time in milliseconds */

* Refresh the position and size of the scroll bars. * @param page pointer to a page object */

* Set the animation time for the page * @param page pointer to a page object * @param anim_time animation time in milliseconds */

* Set the selected option * @param roller pointer to a roller object * @param sel_opt id of the selected option (0 ... number of option - 1); * @pa

* Turn ON the switch * @param sw pointer to a switch objec * @param anim LV_ANOM_ON: set the value with an animation; LV_ANIM_OFF: change the value

* Move the cursor one character left * @param ta pointer to a text area object */

* Move the cursor one character right * @param ta pointer to a text area object */

* Set a theme for the system. * From now, all the created objects will use styles from this theme by default * @param th pointer to theme (return va

* Swap two points * p1 pointer to the first point * p2 pointer to the second point */

Work in progress to support printf. Need to implement stream FILE to write individual chars to chosen serial port

* @brief Initializes the NVIC peripheral according to the specified * parameters in the NVIC_InitStruct. * @note To configure interrupt

* @brief Enables or disables access to the backup domain (RTC registers, RTC * backup data registers and backup SRAM). * @note If the

* @brief ҳ�������״̬�� * @param �� * @retval �� */

* @brief Initializes the SPIx peripheral according to the specified * parameters in the SPI_InitStruct. * @param SPIx: where x can be 1

output the specified string in reverse, taking care of any zero-padding

* Mix two colors. Both color can have alpha value. It requires ARGB888 colors. * @param bg_color background color * @param bg_opa alpha of the backg

* Get the height of a calendar's header based on it's style * @param calendar point to a calendar * @return the header's height */

* Get the number of days in a month * @param year a year * @param month a month. The range is basically [1..12] but [-11..1] is also supported to ha

* Set the start and end angles of an arc. 0 deg: bottom, 90 deg: right etc. * @param arc pointer to an arc object * @param start the start angle [0.

* Set the height of an area * @param area_p pointer to an area * @param h the new height of the area (h == 1 makes y1 == y2) */

* Calculate a value of a Cubic Bezier function. * @param t time in range of [0..LV_BEZIER_VAL_MAX] * @param u0 start values in range of [0..LV_BEZIE

* Set the layout on a button * @param btn pointer to a button object * @param layout a layout from 'lv_cont_layout_t' */

* Set the line width or point radius of the data series * @param chart pointer to a chart object * @param width the new width */

* Initialize the circle drawing * @param c pointer to a point. The coordinates will be calculated here * @param tmp point to a variable. It will sto

* Get the next point from the circle * @param c same as in circ_init. The next point stored here. * @param tmp same as in circ_init. */

* Get the layout of a container * @param cont pointer to container object * @return the layout from 'lv_cont_layout_t' */

* Set the fit policy in all 4 directions separately. * It tell how to change the container's size automatically. * @param cont pointer to a containe

* Get the `data` parameter of the current event * @return the `data` parameter */

* Leave the driver letters and / or \ letters from beginning of the path * @param path path string (E.g. S:/folder/file.txt) * @return pointer to th

* Read from a file * @param file_p pointer to a lv_fs_file_t variable * @param buf pointer to a buffer where the read bytes are stored * @param btr

* Get the minimum value of a gauge * @param gauge pointer to a gauge object * @return the minimum value of the gauge */

* Modify a style with the set 'style_mod' function. The input style remains unchanged. * @param group pointer to group * @param style pointer to a s

* Get the color of an image's pixel * @param dsc an image descriptor * @param x x coordinate of the point to get * @param y x coordinate of the poi

* Set the style of an image * @param img pointer to an image object * @param type which style should be set (can be only `LV_IMG_STYLE_MAIN`) * @pa

* Get the types.pointer.vector of dragging of an input device (for LV_INDEV_TYPE_POINTER and * LV_INDEV_TYPE_BUTTON) * @param indev pointer to an in

* Reset one or all input devices * @param indev pointer to an input device to reset or NULL to reset all of them */

* Set a destination group for a keypad input device (for LV_INDEV_TYPE_KEYPAD) * @param indev pointer to an input device * @param group point to a g

* Get that height reduced by the top an bottom padding. * @param obj pointer to an object * @return the height which still fits into the container

* Tell whether the object is the focused object of a group or not. * @param obj pointer to an object * @return true: the object is focused, false: t