Difference between revisions of "Keypad"
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=KEYPAD= | =KEYPAD= | ||
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==KEYPAD_Init== | ==KEYPAD_Init== | ||
| − | {| | + | {|{{Widget:LibCol}} |
{{#Widget:LibTable}} | {{#Widget:LibTable}} | ||
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| Return Value|| none | | Return Value|| none | ||
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| − | | Description || This function configures the rows and columns for keypad scan. | + | | Description || This function configures the rows and columns for keypad scan.<br /> |
| + | *ROW lines are configured as Output.<br /> | ||
| + | *Column Lines are configured as Input. | ||
|- | |- | ||
| Usage || | | Usage || | ||
|} | |} | ||
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| + | |||
| + | |||
==KEYPAD_GetKey== | ==KEYPAD_GetKey== | ||
| − | {| | + | {|{{Widget:LibCol}} |
{{#Widget:LibTable}} | {{#Widget:LibTable}} | ||
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| Input Arguments || none | | Input Arguments || none | ||
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| − | | Return Value|| uint8_t | + | | Return Value|| uint8_t: ASCII value of the Key Pressed |
|- | |- | ||
| − | | 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. |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
|- | |- | ||
| Usage || | | Usage || | ||
|} | |} | ||
| − | == | + | ==Usage guide== |
| − | + | <syntaxhighlight> | |
| − | + | #include"keypad.h" | |
| − | + | #include"lcd.h" | |
| − | + | #include "delay.h" | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
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| − | + | /* 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> | ||
Latest revision as of 17:22, 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.
|
| 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; }