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#include <stdbool.h>
#include "action.h"
#include "i2c_master.h"
#include "expander.h"
#include "debug.h"
#define I2C_TIMEOUT 100
static uint8_t expander_status = 0;
static uint8_t expander_input = 0;
void expander_config(void);
uint8_t expander_write(uint8_t reg, uint8_t data);
uint8_t expander_read(uint8_t reg, uint8_t *data);
void expander_init(void)
{
i2c_init();
expander_scan();
}
void expander_scan(void)
{
dprintf("expander status: %d ... ", expander_status);
uint8_t ret = i2c_start(EXPANDER_ADDR | I2C_WRITE, I2C_TIMEOUT);
if (ret == 0) {
i2c_stop();
if (expander_status == 0) {
dprintf("attached\n");
expander_status = 1;
expander_config();
clear_keyboard();
}
}
else {
if (expander_status == 1) {
dprintf("detached\n");
expander_status = 0;
clear_keyboard();
}
}
dprintf("%d\n", expander_status);
}
void expander_read_cols(void)
{
expander_read(EXPANDER_REG_GPIOA, &expander_input);
}
uint8_t expander_get_col(uint8_t col)
{
if (col > 4) {
col++;
}
return expander_input & (1<<col) ? 1 : 0;
}
matrix_row_t expander_read_row(void)
{
expander_read_cols();
/* make cols */
matrix_row_t cols = 0;
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
if (expander_get_col(col)) {
cols |= (1UL << (MATRIX_COLS - 1 - col));
}
}
return cols;
}
void expander_unselect_rows(void)
{
expander_write(EXPANDER_REG_IODIRB, 0xFF);
}
void expander_select_row(uint8_t row)
{
expander_write(EXPANDER_REG_IODIRB, ~(1<<(row+1)));
}
void expander_config(void)
{
expander_write(EXPANDER_REG_IPOLA, 0xFF);
expander_write(EXPANDER_REG_GPPUA, 0xFF);
expander_write(EXPANDER_REG_IODIRB, 0xFF);
}
uint8_t expander_write(uint8_t reg, uint8_t data)
{
if (expander_status == 0) {
return 0;
}
return i2c_writeReg(EXPANDER_ADDR, reg, &data, 1, I2C_TIMEOUT);
}
uint8_t expander_read(uint8_t reg, uint8_t *data)
{
if (expander_status == 0) {
return 0;
}
return i2c_readReg(EXPANDER_ADDR, reg, data, 1, I2C_TIMEOUT);
}
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