Component: Keyboard (Controls )

Author	Matrix TSL
Version	1.0
Category	Controls

Keyboard component

Component to allow you to get direct input from the keyboard. Specific keys can be polled to test if they are pressed and provide interaction with the runtime panel. A full list of virtual key codes can be found here: https://docs.microsoft.com/en-gb/windows/win32/inputdev/virtual-key-codes?redirectedfrom=MSDN

Detailed description

No detailed description exists yet for this component

Examples

Here is an example of how to use the keyboard component to map key pressed to various functions on the panel.

Keyboard Example

You can define keys that can be changed by the user by right clicking the keys in the keyboard component property and exposing them to the top level.

Once the properties have been exposed you can double click the top level property and rename to give a meaningful name in your application.

The user can then easily select which key they would like to assign to each function.

Downloadable macro reference

	GetKeyPress
Checks a single virtual key code to test if the button is pressed or not.
- BYTE	KeyCode
Virtual Key Code Number
- BYTE	Return

	CheckMultipleKeys
Checks all of the keys enabled in the component properties. If any keys are pressed then their scan index number is returned. If no keys are pressed then 0 is returned.
- BYTE	Return

	ReadByteFromIndex
Reads an arbitrary byte of data from the current open file. Return = Data byte read from the local sector buffer. Experimental and potentially slow if navigating backwards through the file.
- ULONG	Address
Contains the position of the byte to be read from the file
- BYTE	Return

	CreateFile
Creates a file in the current folder location on the card. Default = Root Returns 0 for success File must be opened using "Open_File" after creation before writing any data.
- STRING	Filename
8.3 format filename e.g."file.txt"
- BYTE	Return

	ScanCurrentFolder
Method for retreiving file or folder names for the card to allow for dynamic file opening or playback. Does not currently simulate. 0 - Filetype found and stored into string array, 1 - End of folder reached, 2 - Filetype mismatch 3 - Empty
- UINT	Current_Idx
Contains the current pointer in the directory table. Values from 0 to 511 to completley search the current folder for a files or folders
- BYTE	Scan_Type
Sets the scan to search for Files or Folders. 0 = Scan for files, 1 = Scan for folders
- BYTE	Return

	ReadByteFromScan
Returns a byte of the name of the file or folder retreived from the Scan_Current_folder function. Return = ASCII byte at position Idx from the folder name or file name at position Current_Idx in the directory
- BYTE	idx
0 - 11 for a file, 0 - 7 for a folder
- BYTE	Return

	OpenFolder
".." - Jumps up a directory, if at root then remains in root "root" - Jumps directly back to the root directory "foldername" - Opens folder named foldername
- STRING	Folder_Name
- BYTE	Return

	ReadByteFromBuffer
Reads a byte of data from the local sector buffer. Return = Data byte read from the local sector buffer.
- UINT	Address
0 - 511 - Contains the position of the byte to be read
- BYTE	Return

	ReadFileLength
Returns the number of bytes in the current sector that are used by the current open file. Return = 512 - Sector is filled with file data Return < 512 - Last sector of the file, Retval specifies how many bytes of data are remaining in the sector
[[File:]] -	Return

	OpenFile
Searches for and opens a file for reading or writing from within the current directory on the disk. Returns 0 for success.
- STRING	Filename
8.3 filename of the file we are trying to open e.g. "file.txt"
- BYTE	Return

	WriteFileSector
Overwrites the current sector on the memory card with the contents of the local sector buffer. See write_byte_to_buffer function. Return = 0 - File sector written successfully. Return > 0 - File sector write error
- BYTE	Return

	SetFileIndex
Sets the current file index and used to switch between several open file streams. Default = 0.
- BYTE	File_Index
File index ranges from 0 to (Max Concurrent Files - 1)
- VOID	Return

	AppendStringToFile
Adds the contents of the data string parameter to the end of the currently open file. Returns 0 for success.
- STRING	Data_String
Data to append to the end of the file
- BYTE	Return

	ReadFileSize
Reads the entire size of the current file in bytes.
- ULONG	Return

	SetTimeAndDate
Sets the current time and date. Time = (Hour << 11) + (Min << 5) + (Sec >> 1) Date = (YearFrom1980 << 9) + (Month << 5) + (Day) Additional details can be found here: http://www.maverick-os.dk/FileSystemFormats/FAT16_FileSystem.html#TimeFormat
- UINT	Time
Sets the current Time in FAT Time format hhhhhmmmmmmsssss - S=Secs/2
- UINT	Date
Sets the current Date in FAT Date format yyyyyyymmmmddddd - Y=Years since 1980
- VOID	Return

	Initialise
Attempts to communicate with the SD card and if successful sets up the file system. Returns 0 for success.
- BYTE	Return

	Initialise
Initialise the comms to the Arduino board ready for commands to be sent.
- VOID	Return

Property reference

	Properties
	Number of Scan Keys
Sets the number of keys to scan through when calling the CheckMultipleKeys function.
	Scan Key 1
Virtual Keycode assigned to the scan index
	Scan Key 2
Virtual Keycode assigned to the scan index
	Scan Key 3
Virtual Keycode assigned to the scan index
	Scan Key 4
Virtual Keycode assigned to the scan index
	Connections
	Simulations