Keypad Library
The mikroC PRO for ARM provides a library for working with 4x4 keypad. The library routines can also be used with 4x1, 4x2, or 4x3 keypad.
External dependencies of Keypad Library
Stellaris
The following variable must be defined in all projects using Keypad Library: | Description : | Example : |
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extern sfr unsigned long keypadPort; |
Keypad Port. | unsigned long keypadPort at GPIO_PORTH_DATA; |
extern sfr unsigned long keypadPort_Direction; |
Keypad Port direction. | unsigned long keypadPort_Direction at GPIO_PORTH_DIR; |
MSP432
The following variable must be defined in all projects using Keypad Library: | Description : | Example : |
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extern sfr unsigned int keypadPort_Output; |
Keypad Port Output. | unsigned int keypadPort_Output at DIO_P5OUT; |
extern sfr unsigned int keypadPort_Input; |
Keypad Port Input. | unsigned int keypadPort_Input at DIO_P5IN; |
STM32
The following variable must be defined in all projects using Keypad Library: | Description : | Example : |
---|---|---|
extern sfr unsigned long keypadPort_Input; |
Keypad Input Port. | unsigned long keypadPort_Input at GPIOD_IDR; |
extern sfr unsigned long keypadPort_Output; |
Keypad Output Port. | unsigned long keypadPort_Output at GPIOD_ODR; |
CEC1x02
The following variable must be defined in all projects using Keypad Library: | Description : | Example : |
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extern sfr unsigned long keypadPort_Input; |
Keypad Input Port. | unsigned long keypadPort_Input at GPIO_INPUT_010_017; |
extern sfr unsigned long keypadPort_Output; |
Keypad Output Port. | unsigned long keypadPort_Output at GPIO_OUTPUT_010_017; |
Library Routines
Keypad_Init
Prototype |
void Keypad_Init(); |
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Description |
Initializes given port for working with keypad. |
Parameters |
None. |
Returns |
Nothing. |
Requires |
External dependencies of the library from the top of the page must be defined before using this function. |
Example |
Stellaris// Keypad module connections unsigned long keypadPort at GPIO_PORTH_DATA; unsigned long keypadPort_Direction at GPIO_PORTH_DIR; // End Keypad module connections ... Keypad_Init(); MSP432// Keypad module connections unsigned int keypadPort_Output at DIO_P5IN; unsigned int keypadPort_Input at DIO_P5OUT; // End Keypad module connections ... Keypad_Init(); STM32// Keypad module connections unsigned long keypadPort_Input at GPIOD_IDR; unsigned long keypadPort_Output at GPIOD_ODR; // End Keypad module connections ... Keypad_Init(); CEC1x02// Keypad module connections unsigned long keypadPort_Input at GPIO_INPUT_010_017; unsigned long keypadPort_Output at GPIO_OUTPUT_010_017; // End Keypad module connections ... Keypad_Init(); |
Notes |
The Keypad library uses lower byte (bits <7..0>) of |
Keypad_Key_Press
Prototype |
unsigned Keypad_Key_Press(); |
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Description |
Reads the key from keypad when key gets pressed. |
Parameters |
None. |
Returns |
The code of a pressed key (1..16). If no key is pressed, returns 0. |
Requires |
Port needs to be initialized for working with the Keypad library, see Keypad_Init. |
Example |
unsigned kp; ... kp = Keypad_Key_Press(); |
Notes |
None. |
Keypad_Key_Click
Prototype |
unsigned Keypad_Key_Click(); |
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Description |
Call to |
Parameters |
None. |
Returns |
The code of a clicked key (1..16). If no key is clicked, returns 0. |
Requires |
Port needs to be initialized for working with the Keypad library, see Keypad_Init. |
Example |
kp = Keypad_Key_Click(); |
Notes |
None. |
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