Difference between revisions of "Keypad"
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| Description || This function waits till a key is pressed and returns its ASCII Value. | | Description || This function waits till a key is pressed and returns its ASCII Value. | ||
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==Usage guide== | ==Usage guide== | ||
Revision as of 12:05, 28 December 2014
Contents
[hide]KEYPAD
KEYPAD_Init
{{#Widget:LibTable}}| Defination | void KEYPAD_Init() |
| Input Arguments | none |
| Return Value | none |
| Description | This function configures the rows and columns for keypad scan.
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| Usage |
KEYPAD_GetKey
{{#Widget:LibTable}}| 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. |
| Usage |
Usage guide
- #include"keypad.h"
- #include"lcd.h"
- #include "delay.h"
- /* Program to demonstrate the hex-Keypad interface*/
- int main()
- {
- uint8_t key;
- LCD_Init(8,2,16); /*Initialize the 2x16 LCD in 8-bit mode */
- KEYPAD_Init(); /*Configure the ROWs and COLUMNs for keypad scanning*/
- while(1)
- {
- key = KEYPAD_GetKey(); /*Get the Ascii value of the key Pressed */
- LCD_DisplayChar(key); /*Display the key pressed */
- }
- return 0;
- }