Keyboard matrix scan code

KeyMatrix.c

/* A single pin of the microcontroller to which a row or column is connected. */
typedef struct {
    volatile uint8_t *Direction;
    volatile uint8_t *Name;
    uint8_t Number;
} Pin_t;

/* This part of the key matrix is stored in the Flash to save SRAM space. */
typedef struct {
    const uint8_t ColNum;
    const uint8_t RowNum;
    const Pin_t *ColPorts;
    const Pin_t *RowPins;
} KeyMatrixInfo_t;

/* This Part of the key matrix is stored in the SRAM. */
typedef struct {
    const __flash KeyMatrixInfo_t *Info;
    uint8_t *Matrix;
} KeyMatrix_t;

const __flash KeyMatrixInfo_t KeyMatrix = {
    .ColNum = 2,
    .RowNum = 2,
    .RowPins = (Pin_t[]) {
        { .Direction=&DDRA, .Name=&PINA, .Number=PINA0 },
        { .Direction=&DDRA, .Name=&PINA, .Number=PINA1 }
    },
    .ColPorts = (Pin_t[]) {
        { .Direction=&DDRB, .Name=&PORTB, .Number=PORTB0 },
        { .Direction=&DDRB, .Name=&PORTB, .Number=PORTB1 },
    }
};

void KeyMatrix_Scan(KeyMatrix_t *KeyMatrix)
{
    for (uint8_t Col=0; Col<KeyMatrix->Info->ColNum; Col++) {
        const Pin_t *ColPort = KeyMatrix->Info->ColPorts + Col;
        for (uint8_t Row=0; Row<KeyMatrix->Info->RowNum; Row++) {
            const Pin_t *RowPin = KeyMatrix->Info->RowPins + Row;
            uint8_t IsKeyPressed = *RowPin->Name & 1<<RowPin->Number;
            KeyMatrix_SetElement(KeyMatrix, Row, Col, IsKeyPressed);
        }
    }
}