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keypad.c
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keypad.c
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#include <stdbool.h>
#include <pigpio.h>
uint8_t Matrix[4][4] = {
{0x1,0x2,0x3,0xA},
{0x4,0x5,0x6,0xB},
{0x7,0x8,0x9,0xC},
{0xE,0x0,0xF,0xD}
};
int Row[4] = {26,19,13,6};
int Col[4] = {21,20,16,12};
bool keypadInitialised = false;
void cleanup_keypad(void) {
if (!keypadInitialised) return;
for (int j = 0; j < 4; j++) {
gpioWrite(Col[j], 0);
gpioSetMode(Col[j], PI_INPUT);
}
for (int i = 0; i < 4; i++)
gpioSetPullUpDown(Row[i], PI_PUD_OFF);
keypadInitialised = false;
}
void init_keypad(void) {
for (int j = 0; j < 4; j++) {
gpioSetMode(Col[j], PI_OUTPUT);
gpioWrite(Col[j], 1);
}
for (int i = 0; i < 4; i++) {
gpioSetMode(Row[i], PI_INPUT);
gpioSetPullUpDown(Row[i], PI_PUD_UP);
}
keypadInitialised = true;
}
void set_key(bool * key) {
if (!keypadInitialised)
init_keypad();
for (int j = 0; j < 4; j++) {
gpioWrite(Col[j], 0);
for (int i = 0; i < 4; i++) {
key[Matrix[i][j]] = (gpioRead(Row[i]) == 0);
}
gpioWrite(Col[j], 1);
}
}