13 #define EXPANDER_ADDR ((0x20|(MCP23017_A0<<0)|(MCP23017_A1<<1)|(MCP23017_A2<<2)) << 1)
14 enum EXPANDER_REG_BANK0 {
15 EXPANDER_REG_IODIRA = 0,
19 EXPANDER_REG_GPINTENA,
20 EXPANDER_REG_GPINTENB,
40 void expander_init(void);
41 void expander_scan(void);
42 void expander_read_cols(void);
43 uint8_t expander_get_col(uint8_t col);
44 matrix_row_t expander_read_row(void);
45 void expander_unselect_rows(void);
46 void expander_select_row(uint8_t row);