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Calculator.ino
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#include <Wire.h>
#define FACES_KEYBOARD_I2C_ADDR 0x08
#define Set_Bit(val, bitn) (val |=(1<<(bitn)))
#define Clr_Bit(val, bitn) (val&=~(1<<(bitn)))
#define Get_Bit(val, bitn) (val &(1<<(bitn)) )
//L1 PD2
//L2 PD3
//L3 PD4
//L4 PD5
//L5 PD6
//C1 PC0
//C2 PC1
//C3 PC2
//C4 PC3
//IRQ PB0
#define IRQ_1 Set_Bit(PORTB,0)
#define IRQ_0 Clr_Bit(PORTB,0)
void setup()
{
Set_Bit(DDRB, 0);
IRQ_1;
DDRC = 0x00;
PORTC = 0xff;
DDRD = 0xff;
PORTD = 0x00;
Wire.begin(FACES_KEYBOARD_I2C_ADDR);
Wire.onRequest(requestEvent);
}
unsigned char i = 0;
unsigned char temp = 0, hadPressed = 0;
void requestEvent()
{
if (hadPressed == 1)
{
Wire.write(temp);
hadPressed = 0;
IRQ_1;
return;
}
}
int count = 0;
void loop()
{
// Serial.println(temp);
Clr_Bit(PORTD, 2);
Set_Bit(PORTD, 3);
Set_Bit(PORTD, 4);
Set_Bit(PORTD, 5);
Set_Bit(PORTD, 6);
delay(1);
switch (PINC & 0x0f)
{
case 0x0e:
count = 0;
while ((PINC & 0x0f) != 0x0f)
{
if (count++ > 400)
{
temp = 0x08; //backspace
hadPressed = 1; IRQ_0;
while ((PINC & 0x0f) != 0x0f) delay(1);
return; break;
}
delay(1);
}
temp = 'A'; hadPressed = 1; IRQ_0; return; break;
case 0x0d: temp = 'M'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x0b: temp = '%'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x07: temp = '/'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
}
Set_Bit(PORTD, 2);
Clr_Bit(PORTD, 3);
Set_Bit(PORTD, 4);
Set_Bit(PORTD, 5);
Set_Bit(PORTD, 6);
delay(1);
switch (PINC & 0x0f)
{
case 0x0e: temp = '7'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x0d: temp = '8'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x0b: temp = '9'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x07: temp = '*'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
}
Set_Bit(PORTD, 2);
Set_Bit(PORTD, 3);
Clr_Bit(PORTD, 4);
Set_Bit(PORTD, 5);
Set_Bit(PORTD, 6);
delay(1);
switch (PINC & 0x0f)
{
case 0x0e: temp = '4'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x0d: temp = '5'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x0b: temp = '6'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x07: temp = '-'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
}
Set_Bit(PORTD, 2);
Set_Bit(PORTD, 3);
Set_Bit(PORTD, 4);
Clr_Bit(PORTD, 5);
Set_Bit(PORTD, 6);
delay(1);
switch (PINC & 0x0f)
{
case 0x0e: temp = '1'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x0d: temp = '2'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x0b: temp = '3'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x07: temp = '+'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
}
Set_Bit(PORTD, 2);
Set_Bit(PORTD, 3);
Set_Bit(PORTD, 4);
Set_Bit(PORTD, 5);
Clr_Bit(PORTD, 6);
delay(1);
switch (PINC & 0x0f)
{
case 0x0e: temp = '.'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x0d: temp = '0'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x0b: temp = '`'; while ((PINC & 0x0f) != 0x0f)delay(1); hadPressed = 1; IRQ_0; return; break;
case 0x07:
count = 0;
while ((PINC & 0x0f) != 0x0f)
{
if (count++ > 400)
{
temp = 0x0d;
hadPressed = 1; IRQ_0;
while ((PINC & 0x0f) != 0x0f) delay(1);
return; break;
}
delay(1);
}
temp = '='; hadPressed = 1; IRQ_0; return; break;
}
delay(10);
}