//Press any switch & display that number.
//Ex: 1 - > 1, 2 ->2, … 8 -> 8,9 -> 9,0 -> 0.
#include "register.h"
#include "functions.h"
#define ROWS 4
#define COLS 4
// Define keypad array globally
char keypad[ROWS][COLS] = {
{'1', '2', '3', 'A'},
{'4', '5', '6', 'B'},
{'7', '8', '9', 'C'},
{'*', '0', '#', 'D'}
};
// Function to read the keypad
char read_keypad()
{
uint8_t row, column;
for (row = 0; row < ROWS; row++)
{
*outf = (1 << row); // Activate one row at a time
for (column = 0; column < COLS; column++)
{
if ((*ink & (1 << column))) // Check each column in the active row
{
return keypad[row][column];
}
}
}
}
void setup()
{
*dirf = 0x0F; // Set first four pins of PORT F as o/p. KEYPAD row pins are connected to port f.
*dirk = 0x00; // Set PORT K as i/p port. KEYPAD column pins are connected to port k.
*dira = 0x0F; // Set first 4 pins of PORT A as o/p.
*dirc = 0x0F; // Set first 4 pins of PORT C as o/p.
char key;
int index;
while (1)
{
key = read_keypad();
if (key >= '0' && key <= '9') // If a numeric key is pressed
{
index = key - '0';// Convert the key to an index
*outa=0x0E;
*outc = display(index);
}
else if (key >= 'A' && key <= 'D') // If a letter key is pressed
{
index = key - 'A' + 10;// Convert the key to an index
*outa=0x0E;
*outc = display(index);
}
else //if anything other than 0-9 or A-D is pressed display nothing
{
*outc = 0x00;
}
}
}