Difference between revisions of "Keypad"
(→KEYPAD_GetKey) |
|||
| Line 23: | Line 23: | ||
{{#Widget:LibTable}} | {{#Widget:LibTable}} | ||
|- | |- | ||
| − | |Defination || unsigned char KEYPAD_GetKey() | + | |Defination || '''unsigned char KEYPAD_GetKey()''' |
|- | |- | ||
| Input Arguments || none | | Input Arguments || none | ||
|- | |- | ||
| − | | Return Value|| uint8_t--> ASCII value of the Key Pressed | + | | Return Value|| '''uint8_t'''--> ASCII value of the Key Pressed |
|- | |- | ||
| − | | Description || This function waits till a key is pressed and returns its ASCII Value. It follows the following sequences to decode the key pressed: | + | | Description || This function waits till a key is pressed and returns its ASCII Value. |
| − | + | It follows the following sequences to decode the key pressed: | |
| − | + | *Wait till the previous key is released.. | |
| − | + | *Wait for the new key press. | |
| − | + | *Scan all the rows one at a time for the pressed key. | |
| + | *Decodes the key pressed depending on ROW-COL combination and returns its | ||
ASCII value. | ASCII value. | ||
|- | |- | ||
Revision as of 23:13, 20 December 2014
Contents
KEYPAD
KEYPAD_Init
| Defination | void KEYPAD_Init() |
| Input Arguments | none |
| Return Value | none |
| Description | This function configures the rows and columns for keypad scan. 1.ROW lines are configured as Output. 2.Column Lines are configured as Input. |
| Usage |
KEYPAD_GetKey
| Defination | unsigned char KEYPAD_GetKey() |
| Input Arguments | none |
| Return Value | uint8_t--> ASCII value of the Key Pressed |
| Description | This function waits till a key is pressed and returns its ASCII Value.
It follows the following sequences to decode the key pressed:
ASCII value. |
| Usage |
KEYPAD_WaitForKeyRelease
| Defination | void KEYPAD_WaitForKeyRelease() |
| Input Arguments | none |
| Return Value | none |
| Description | This function waits till the previous key is released. |
| Usage |
KEYPAD_WaitForKeyPress
| Defination | void KEYPAD_WaitForKeyPress() |
| Input Arguments | none |
| Return Value | none |
| Description | This function waits till a new key is pressed. The new Key pressed can be decoded by the function KEYPAD_GetKey. |
| Usage |