Matrix-orbital DD-DB1 LCD/VFD Dev Board Manual de usuario descargar pdf (Pagina 30)

6. Keypad

6.1.Auto Transmit

Key Presses On

Dec

Hex

ASCII

254 65

FE 41

A■

Key presses are automatically sent to the host when received by the display. Default is auto transmit on.

6.2.Auto Transmit

Key Presses Off

Dec

Hex

ASCII

254 79

FE 4F

O■

Key presses are held in the 10 key buffer to be polled by the host. Use this mode for I

C transactions. Default is on.

6.3.Poll Key

Press

Dec

Hex

ASCII

254 38

FE 26

&■

Reads the last unread key press from the 10 key display buffer. If another key is stored in the buffer the MSB will be 1,

the MSB will be 0 when the last key press is read. If there are no stored key presses a value of 0 will be returned. Auto

transmit key presses must be turned off for this command to be successful.

Response 1 byte, value of key pressed (MSB determines additional keys to be read)

6.4.Clear Key

Buffer

Dec

Hex

ASCII

254 69

FE 45

E■

Clears all key presses from the display buffer.

6.5.Set

Debounce

Time

Dec

Hex

ASCII

254 85

FE 55

U■

Time

Sets the time between a key press and a key read by the display. Most switches will bounce when pressed, the debounce

time allows the switch to settle for an accurate read. Default is 8 representing a debounce time of approximately 52ms.

Time 1 byte, debounce increment (debounce time = time * 6.554ms)

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 46 47

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Matrix-orbital DD-DB1 LCD/VFD Dev Board Manual de usuario Pagina 30

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