Difference between revisions of "Keypad"
| Line 50: | Line 50: | ||
| − | =Usage guide== | + | ==Usage guide== |
| + | <syntaxhighlight> | ||
| + | #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; | ||
| + | } | ||
| + | |||
| + | </syntaxhighlight> | ||
Revision as of 17:44, 27 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.
|
| 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 |
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; }