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
KEYPAD
KEYPAD_Init
| 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
| 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; }