#ifndef MATRIX_SKEL_H
-#define MATRIX_SKEL_H 1
+#define MATRIX_SKEL_H 1
#include <stdbool.h>
/* number of matrix rows */
-int matrix_rows(void);
+uint8_t matrix_rows(void);
/* number of matrix columns */
-int matrix_cols(void);
+uint8_t matrix_cols(void);
/* intialize matrix for scaning. should be called once. */
void matrix_init(void);
/* scan all key states on matrix */
-int matrix_scan(void);
+uint8_t matrix_scan(void);
/* whether modified from previous scan. used after matrix_scan. */
bool matrix_is_modified(void);
/* whether ghosting occur on matrix. */
bool matrix_has_ghost(void);
+/* whether a swtich is on */
+bool matrix_is_on(uint8_t row, uint8_t col);
/* matrix state on row */
-uint16_t matrix_get_row(int row);
+#if (MATRIX_COLS <= 8)
+uint8_t matrix_get_row(uint8_t row);
+#else
+uint16_t matrix_get_row(uint8_t row);
+#endif
/* count keys pressed */
-int matrix_key_count(void);
+uint8_t matrix_key_count(void);
/* print matrix for debug */
void matrix_print(void);