@ -1,5 +1,4 @@
/*
Copyright 2013 Oleg Kostyuk < cub . uanic @ gmail . com >
Copyright 2017 Erin Call < hello @ erincall . com >
@ -16,10 +15,6 @@ GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program . If not , see < http : //www.gnu.org/licenses/>.
*/
/*
* scan matrix
*/
# include <stdint.h>
# include <stdbool.h>
# include <avr/io.h>
@ -31,47 +26,66 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
# include "matrix.h"
# include "dactyl.h"
# include "i2cmaster.h"
# ifdef DEBUG_MATRIX_SCAN_RATE
# include "timer.h"
# include "timer.h"
/* Set 0 if debouncing isn't needed */
# ifndef DEBOUNCING_DELAY
# define DEBOUNCING_DELAY 5
# endif
/*
* This constant define not debouncing time in msecs , but amount of matrix
* scan loops which should be made to get stable debounced results .
*
* On the Dactyl , the matrix scan rate is relatively low , because
* communicating with the left hand ' s I / O expander is slower than simply
* selecting local pins .
* Now it ' s only 317 scans / second , or about 3.15 msec / scan .
* According to Cherry specs , debouncing time is 5 msec .
*
* And so , there is no sense to have DEBOUNCE higher than 2.
*/
# ifndef DEBOUNCE
# define DEBOUNCE 5
# if (DEBOUNCING_DELAY > 0)
static uint16_t debouncing_time ;
static bool debouncing = false ;
# endif
# ifdef MATRIX_MASKED
extern const matrix_row_t matrix_mask [ ] ;
# endif
# if (DIODE_DIRECTION == ROW2COL) || (DIODE_DIRECTION == COL2ROW)
static const uint8_t onboard_row_pins [ MATRIX_ROWS ] = MATRIX_ONBOARD_ROW_PINS ;
static const uint8_t onboard_col_pins [ MATRIX_COLS ] = MATRIX_ONBOARD_COL_PINS ;
static const bool col_expanded [ MATRIX_COLS ] = COL_EXPANDED ;
static const uint8_t expander_row_pins [ MATRIX_ROWS ] = MATRIX_EXPANDER_ROW_PINS ;
static const uint8_t expander_col_pins [ MATRIX_COLS ] = MATRIX_EXPANDER_COL_PINS ;
# endif
/* matrix state(1:on, 0:off) */
static matrix_row_t matrix [ MATRIX_ROWS ] ;
// Debouncing: store for each key the number of scans until it's eligible to
// change. When scanning the matrix, ignore any changes in keys that have
// already changed in the last DEBOUNCE scans.
static uint8_t debounce_matrix [ MATRIX_ROWS * MATRIX_COLS ] ;
static matrix_row_t read_cols ( uint8_t row ) ;
static void init_cols ( void ) ;
static void unselect_rows ( void ) ;
static void select_row ( uint8_t row ) ;
static matrix_row_t matrix_debouncing [ MATRIX_ROWS ] ;
# if (DIODE_DIRECTION == COL2ROW)
static void init_cols ( void ) ;
static bool read_cols_on_row ( matrix_row_t current_matrix [ ] , uint8_t current_row ) ;
static void unselect_rows ( void ) ;
static void select_row ( uint8_t row ) ;
static void unselect_row ( uint8_t row ) ;
# elif (DIODE_DIRECTION == ROW2COL)
static void init_rows ( void ) ;
static bool read_rows_on_col ( matrix_row_t current_matrix [ ] , uint8_t current_col ) ;
static void unselect_cols ( void ) ;
static void select_col ( uint8_t col ) ;
static void unselect_col ( uint8_t col ) ;
# endif
static uint8_t mcp23018_reset_loop ;
static uint8_t expander_reset_loop ;
uint8_t expander_status ;
uint8_t expander_input_pin_mask ;
bool i2c_initialized = false ;
# ifdef DEBUG_MATRIX_SCAN_RATE
uint32_t matrix_timer ;
uint32_t matrix_scan_count ;
# endif
# define ROW_SHIFTER ((matrix_row_t)1)
# if (DIODE_DIRECTION == COL2ROW)
// bitmask to ensure the row state from the expander only applies to its columns
# define EXPANDER_MASK ((matrix_row_t)0b00111111)
# endif
__attribute__ ( ( weak ) )
void matrix_init_user ( void ) { }
@ -103,20 +117,20 @@ uint8_t matrix_cols(void)
void matrix_init ( void )
{
// initialize row and col
mcp23018_status = init_mcp23018 ( ) ;
init_expander ( ) ;
# if (DIODE_DIRECTION == COL2ROW)
unselect_rows ( ) ;
init_cols ( ) ;
# elif (DIODE_DIRECTION == ROW2COL)
unselect_cols ( ) ;
init_rows ( ) ;
# endif
// initialize matrix state: all keys off
for ( uint8_t i = 0 ; i < MATRIX_ROWS ; i + + ) {
matrix [ i ] = 0 ;
for ( uint8_t j = 0 ; j < MATRIX_COLS ; + + j ) {
debounce_matrix [ i * MATRIX_COLS + j ] = 0 ;
}
matrix_debouncing [ i ] = 0 ;
}
# ifdef DEBUG_MATRIX_SCAN_RATE
@ -125,59 +139,100 @@ void matrix_init(void)
# endif
matrix_init_quantum ( ) ;
}
void matrix_power_up ( void ) {
mcp23018_status = init_mcp23018 ( ) ;
unselect_rows ( ) ;
init_cols ( ) ;
void init_expander ( void ) {
if ( ! i2c_initialized ) {
i2c_init ( ) ;
wait_us ( 1000000 ) ;
}
// initialize matrix state: all keys off
for ( uint8_t i = 0 ; i < MATRIX_ROWS ; i + + ) {
matrix [ i ] = 0 ;
if ( ! expander_input_pin_mask ) {
# if (DIODE_DIRECTION == COL2ROW)
for ( int col = 0 ; col < MATRIX_COLS ; col + + ) {
if ( col_expanded [ col ] ) {
expander_input_pin_mask | = ( 1 < < expander_col_pins [ col ] ) ;
}
}
# elif (DIODE_DIRECTION == ROW2COL)
for ( int row = 0 ; row < MATRIX_ROWS ; row + + ) {
expander_input_pin_mask | = ( 1 < < expander_row_pins [ row ] ) ;
}
# endif
}
# ifdef DEBUG_MATRIX_SCAN_RATE
matrix_timer = timer_read32 ( ) ;
matrix_scan_count = 0 ;
expander_status = i2c_start ( I2C_ADDR_WRITE ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( IODIRA ) ; if ( expander_status ) goto out ;
/*
Pin direction and pull - up depends on both the diode direction
and on whether the column register is 0 ( " A " ) or 1 ( " B " ) :
+ - - - - - - - + - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - +
| | ROW2COL | COL2ROW |
+ - - - - - - - + - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - +
| Reg 0 | input , output | output , input |
+ - - - - - - - + - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - +
| Reg 1 | output , input | input , output |
+ - - - - - - - + - - - - - - - - - - - - - - - + - - - - - - - - - - - - - - - +
*/
# if (EXPANDER_COLUMN_REGISTER == 0)
# if (DIODE_DIRECTION == COL2ROW)
expander_status = i2c_write ( expander_input_pin_mask ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( 0 ) ; if ( expander_status ) goto out ;
# elif (DIODE_DIRECTION == ROW2COL)
expander_status = i2c_write ( 0 ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( expander_input_pin_mask ) ; if ( expander_status ) goto out ;
# endif
# elif (EXPANDER_COLUMN_REGISTER == 1)
# if (DIODE_DIRECTION == COL2ROW)
expander_status = i2c_write ( 0 ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( expander_input_pin_mask ) ; if ( expander_status ) goto out ;
# elif (DIODE_DIRECTION == ROW2COL)
expander_status = i2c_write ( expander_input_pin_mask ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( 0 ) ; if ( expander_status ) goto out ;
# endif
# endif
}
// Returns a matrix_row_t whose bits are set if the corresponding key should be
// eligible to change in this scan.
matrix_row_t debounce_mask ( uint8_t row ) {
matrix_row_t result = 0 ;
for ( uint8_t j = 0 ; j < MATRIX_COLS ; + + j ) {
if ( debounce_matrix [ row * MATRIX_COLS + j ] ) {
- - debounce_matrix [ row * MATRIX_COLS + j ] ;
} else {
result | = ( 1 < < j ) ;
}
}
return result ;
}
i2c_stop ( ) ;
// set pull-up
// - unused : off : 0
// - input : on : 1
// - driving : off : 0
expander_status = i2c_start ( I2C_ADDR_WRITE ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( GPPUA ) ; if ( expander_status ) goto out ;
# if (EXPANDER_COLUMN_REGISTER == 0)
# if (DIODE_DIRECTION == COL2ROW)
expander_status = i2c_write ( expander_input_pin_mask ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( 0 ) ; if ( expander_status ) goto out ;
# elif (DIODE_DIRECTION == ROW2COL)
expander_status = i2c_write ( 0 ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( expander_input_pin_mask ) ; if ( expander_status ) goto out ;
# endif
# elif (EXPANDER_COLUMN_REGISTER == 1)
# if (DIODE_DIRECTION == COL2ROW)
expander_status = i2c_write ( 0 ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( expander_input_pin_mask ) ; if ( expander_status ) goto out ;
# elif (DIODE_DIRECTION == ROW2COL)
expander_status = i2c_write ( expander_input_pin_mask ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( 0 ) ; if ( expander_status ) goto out ;
# endif
# endif
// Report changed keys in the given row. Resets the debounce countdowns
// corresponding to each set bit in 'change' to DEBOUNCE.
void debounce_report ( matrix_row_t change , uint8_t row ) {
for ( uint8_t i = 0 ; i < MATRIX_COLS ; + + i ) {
if ( change & ( 1 < < i ) ) {
debounce_matrix [ row * MATRIX_COLS + i ] = DEBOUNCE ;
}
}
out :
i2c_stop ( ) ;
}
uint8_t matrix_scan ( void )
{
if ( mcp23018 _status) { // if there was an error
if ( + + mcp23018 _reset_loop = = 0 ) {
// since mcp23018 _reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
if ( expander_status ) { // if there was an error
if ( + + expander_reset_loop = = 0 ) {
// since expander _reset_loop is 8 bit - we'll try to reset once in 255 matrix scans
// this will be approx bit more frequent than once per second
print ( " trying to reset mcp23018 \n " ) ;
mcp23018_status = init_mcp23018 ( ) ;
if ( mcp23018 _status) {
print ( " trying to reset expander \n " ) ;
init_expander ( ) ;
if ( expander _status) {
print ( " left side not responding \n " ) ;
} else {
print ( " left side attached \n " ) ;
@ -199,37 +254,71 @@ uint8_t matrix_scan(void)
}
# endif
for ( uint8_t i = 0 ; i < MATRIX_ROWS ; i + + ) {
select_row ( i ) ;
wait_us ( 30 ) ; // without this wait read unstable value.
matrix_row_t mask = debounce_mask ( i ) ;
matrix_row_t cols = ( read_cols ( i ) & mask ) | ( matrix [ i ] & ~ mask ) ;
debounce_report ( cols ^ matrix [ i ] , i ) ;
matrix [ i ] = cols ;
unselect_rows ( ) ;
# if (DIODE_DIRECTION == COL2ROW)
for ( uint8_t current_row = 0 ; current_row < MATRIX_ROWS ; current_row + + ) {
# if (DEBOUNCING_DELAY > 0)
bool matrix_changed = read_cols_on_row ( matrix_debouncing , current_row ) ;
if ( matrix_changed ) {
debouncing = true ;
debouncing_time = timer_read ( ) ;
}
# else
read_cols_on_row ( matrix , current_row ) ;
# endif
}
matrix_scan_quantum ( ) ;
# elif (DIODE_DIRECTION == ROW2COL)
for ( uint8_t current_col = 0 ; current_col < MATRIX_COLS ; current_col + + ) {
# if (DEBOUNCING_DELAY > 0)
bool matrix_changed = read_rows_on_col ( matrix_debouncing , current_col ) ;
if ( matrix_changed ) {
debouncing = true ;
debouncing_time = timer_read ( ) ;
}
# else
read_rows_on_col ( matrix , current_col ) ;
# endif
}
# endif
# if (DEBOUNCING_DELAY > 0)
if ( debouncing & & ( timer_elapsed ( debouncing_time ) > DEBOUNCING_DELAY ) ) {
for ( uint8_t i = 0 ; i < MATRIX_ROWS ; i + + ) {
matrix [ i ] = matrix_debouncing [ i ] ;
}
debouncing = false ;
}
# endif
matrix_scan_quantum ( ) ;
return 1 ;
}
bool matrix_is_modified ( void ) // deprecated and evidently not called.
{
# if (DEBOUNCING_DELAY > 0)
if ( debouncing ) return false ;
# endif
return true ;
}
inline
bool matrix_is_on ( uint8_t row , uint8_t col )
{
return ( matrix [ row ] & ( ( matrix_row_t ) 1 < < col ) ) ;
return ( matrix [ row ] & ( ROW_SHIFTER < < col ) ) ;
}
inline
matrix_row_t matrix_get_row ( uint8_t row )
{
# ifdef MATRIX_MASKED
return matrix [ row ] & matrix_mask [ row ] ;
# else
return matrix [ row ] ;
# endif
}
void matrix_print ( void )
@ -251,143 +340,203 @@ uint8_t matrix_key_count(void)
return count ;
}
/* Column pin configuration
*
* Teensy
* col : 0 1 2 3 4 5
* pin : F0 F1 F4 F5 F6 F7
*
* MCP23018
* col : 0 1 2 3 4 5
* pin : B5 B4 B3 B2 B1 B0
*/
static void init_cols ( void )
{
// init on mcp23018
// not needed, already done as part of init_mcp23018()
# if (DIODE_DIRECTION == COL2ROW)
// init on teensy
// Input with pull-up(DDR:0, PORT:1)
DDRF & = ~ ( 1 < < 7 | 1 < < 6 | 1 < < 5 | 1 < < 4 | 1 < < 1 | 1 < < 0 ) ;
PORTF | = ( 1 < < 7 | 1 < < 6 | 1 < < 5 | 1 < < 4 | 1 < < 1 | 1 < < 0 ) ;
static void init_cols ( void ) {
for ( uint8_t x = 0 ; x < MATRIX_COLS ; x + + ) {
if ( ! col_expanded [ x ] ) {
uint8_t pin = onboard_col_pins [ x ] ;
_SFR_IO8 ( ( pin > > 4 ) + 1 ) & = ~ _BV ( pin & 0xF ) ; // IN
_SFR_IO8 ( ( pin > > 4 ) + 2 ) | = _BV ( pin & 0xF ) ; // HI
}
}
}
static matrix_row_t read_cols ( uint8_t row )
{
if ( row < 6 ) {
if ( mcp23018_status ) { // if there was an error
return 0 ;
} else {
uint8_t data = 0 ;
mcp23018_status = i2c_start ( I2C_ADDR_WRITE ) ; if ( mcp23018_status ) goto out ;
mcp23018_status = i2c_write ( GPIOB ) ; if ( mcp23018_status ) goto out ;
mcp23018_status = i2c_start ( I2C_ADDR_READ ) ; if ( mcp23018_status ) goto out ;
data = i2c_readNak ( ) ;
data = ~ data ;
static bool read_cols_on_row ( matrix_row_t current_matrix [ ] , uint8_t current_row ) {
// Store last value of row prior to reading
matrix_row_t last_row_value = current_matrix [ current_row ] ;
// Clear data in matrix row
current_matrix [ current_row ] = 0 ;
// Select row and wait for row selection to stabilize
select_row ( current_row ) ;
wait_us ( 30 ) ;
// Read columns from expander, unless it's in an error state
if ( ! expander_status ) {
expander_status = i2c_start ( I2C_ADDR_WRITE ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( GPIOA ) ; if ( expander_status ) goto out ;
expander_status = i2c_start ( I2C_ADDR_READ ) ; if ( expander_status ) goto out ;
current_matrix [ current_row ] | = ( ~ i2c_readNak ( ) ) & EXPANDER_MASK ;
out :
i2c_stop ( ) ;
return data ;
}
// Read columns from onboard pins
for ( uint8_t col_index = 0 ; col_index < MATRIX_COLS ; col_index + + ) {
if ( ! col_expanded [ col_index ] ) {
uint8_t pin = onboard_col_pins [ col_index ] ;
uint8_t pin_state = ( _SFR_IO8 ( pin > > 4 ) & _BV ( pin & 0xF ) ) ;
current_matrix [ current_row ] | = pin_state ? 0 : ( ROW_SHIFTER < < col_index ) ;
}
} else {
// read from teensy
return
( PINF & ( 1 < < 0 ) ? 0 : ( 1 < < 0 ) ) |
( PINF & ( 1 < < 1 ) ? 0 : ( 1 < < 1 ) ) |
( PINF & ( 1 < < 4 ) ? 0 : ( 1 < < 2 ) ) |
( PINF & ( 1 < < 5 ) ? 0 : ( 1 < < 3 ) ) |
( PINF & ( 1 < < 6 ) ? 0 : ( 1 < < 4 ) ) |
( PINF & ( 1 < < 7 ) ? 0 : ( 1 < < 5 ) ) ;
}
unselect_row ( current_row ) ;
return ( last_row_value ! = current_matrix [ current_row ] ) ;
}
/* Row pin configuration
*
* Teensy
* row : 6 7 8 9 10 11
* pin : B1 B2 B3 D2 D3 C6
*
* MCP23018
* row : 0 1 2 3 4 5
* pin : A0 A1 A2 A3 A4 A5
*/
static void unselect_rows ( void )
{
// unselect on mcp23018
if ( mcp23018_status ) { // if there was an error
// do nothing
} else {
// set all rows hi-Z : 1
mcp23018_status = i2c_start ( I2C_ADDR_WRITE ) ; if ( mcp23018_status ) goto out ;
mcp23018_status = i2c_write ( GPIOA ) ; if ( mcp23018_status ) goto out ;
mcp23018_status = i2c_write ( 0xFF ) ; if ( mcp23018_status ) goto out ;
static void select_row ( uint8_t row ) {
// select on expander, unless it's in an error state
if ( ! expander_status ) {
// set active row low : 0
// set other rows hi-Z : 1
expander_status = i2c_start ( I2C_ADDR_WRITE ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( GPIOB ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( 0xFF & ~ ( 1 < < row ) ) ; if ( expander_status ) goto out ;
out :
i2c_stop ( ) ;
}
// select on teensy
uint8_t pin = onboard_row_pins [ row ] ;
_SFR_IO8 ( ( pin > > 4 ) + 1 ) | = _BV ( pin & 0xF ) ; // OUT
_SFR_IO8 ( ( pin > > 4 ) + 2 ) & = ~ _BV ( pin & 0xF ) ; // LOW
}
static void unselect_row ( uint8_t row )
{
// No need to explicitly unselect expander pins--their I/O state is
// set simultaneously, with a single bitmask sent to i2c_write. When
// select_row selects a single pin, it implicitly unselects all the
// other ones.
// unselect on teensy
// Hi-Z(DDR:0, PORT:0) to unselect
DDRB & = ~ ( 1 < < 1 | 1 < < 2 | 1 < < 3 ) ;
PORTB & = ~ ( 1 < < 1 | 1 < < 2 | 1 < < 3 ) ;
DDRD & = ~ ( 1 < < 2 | 1 < < 3 ) ;
PORTD & = ~ ( 1 < < 2 | 1 < < 3 ) ;
DDRC & = ~ ( 1 < < 6 ) ;
PORTC & = ~ ( 1 < < 6 ) ;
uint8_t pin = onboard_row_pins [ row ] ;
_SFR_IO8 ( ( pin > > 4 ) + 1 ) & = ~ _BV ( pin & 0xF ) ; // OUT
_SFR_IO8 ( ( pin > > 4 ) + 2 ) | = _BV ( pin & 0xF ) ; // LOW
}
static void unselect_rows ( void ) {
for ( uint8_t x = 0 ; x < MATRIX_ROWS ; x + + ) {
unselect_row ( x ) ;
}
}
/* Row pin configuration
*
* Teensy
* row : 6 7 8 9 10 11
* pin : B1 B2 B3 D2 D3 C6
*
* MCP23018
* row : 0 1 2 3 4 5
* pin : A0 A1 A2 A3 A4 A5
*/
static void select_row ( uint8_t row )
# elif (DIODE_DIRECTION == ROW2COL)
static void init_rows ( void )
{
if ( row < 6 ) {
// select on mcp23018
if ( mcp23018_status ) { // if there was an error
for ( uint8_t x = 0 ; x < MATRIX_ROWS ; x + + ) {
uint8_t pin = onboard_row_pins [ x ] ;
_SFR_IO8 ( ( pin > > 4 ) + 1 ) & = ~ _BV ( pin & 0xF ) ; // IN
_SFR_IO8 ( ( pin > > 4 ) + 2 ) | = _BV ( pin & 0xF ) ; // HI
}
}
static bool read_rows_on_col ( matrix_row_t current_matrix [ ] , uint8_t current_col )
{
bool matrix_changed = false ;
uint8_t column_state = 0 ;
//select col and wait for selection to stabilize
select_col ( current_col ) ;
wait_us ( 30 ) ;
if ( current_col < 6 ) {
// read rows from expander
if ( expander_status ) {
// it's already in an error state; nothing we can do
return false ;
}
expander_status = i2c_start ( I2C_ADDR_WRITE ) ; if ( expander_status ) goto out ;
expander_status = i2c_write ( GPIOB ) ; if ( expander_status ) goto out ;
expander_status = i2c_start ( I2C_ADDR_READ ) ; if ( expander_status ) goto out ;
column_state = i2c_readNak ( ) ;
out :
i2c_stop ( ) ;
column_state = ~ column_state ;
} else {
for ( uint8_t current_row = 0 ; current_row < MATRIX_ROWS ; current_row + + ) {
if ( ( _SFR_IO8 ( onboard_row_pins [ current_row ] > > 4 ) & _BV ( onboard_row_pins [ current_row ] & 0xF ) ) = = 0 ) {
column_state | = ( 1 < < current_row ) ;
}
}
}
for ( uint8_t current_row = 0 ; current_row < MATRIX_ROWS ; current_row + + ) {
// Store last value of row prior to reading
matrix_row_t last_row_value = current_matrix [ current_row ] ;
if ( column_state & ( 1 < < current_row ) ) {
// key closed; set state bit in matrix
current_matrix [ current_row ] | = ( ROW_SHIFTER < < current_col ) ;
} else {
// key open; clear state bit in matrix
current_matrix [ current_row ] & = ~ ( ROW_SHIFTER < < current_col ) ;
}
// Determine whether the matrix changed state
if ( ( last_row_value ! = current_matrix [ current_row ] ) & & ! ( matrix_changed ) )
{
matrix_changed = true ;
}
}
unselect_col ( current_col ) ;
return matrix_changed ;
}
static void select_col ( uint8_t col )
{
if ( col_expanded [ col ] ) {
// select on expander
if ( expander_status ) { // if there was an error
// do nothing
} else {
// set active row low : 0
// set other rows hi-Z : 1
mcp23018_status = i2c_start ( I2C_ADDR_WRITE ) ; if ( mcp23018_status ) goto out ;
mcp23018_status = i2c_write ( GPIOA ) ; if ( mcp23018_status ) goto out ;
mcp23018_status = i2c_write ( 0xFF & ~ ( 1 < < row ) ) ; if ( mcp23018_status ) goto out ;
// set active col low : 0
// set other col s hi-Z : 1
expander _status = i2c_start ( I2C_ADDR_WRITE ) ; if ( expander _status) goto out ;
expander _status = i2c_write ( GPIOA ) ; if ( expander _status) goto out ;
expander _status = i2c_write ( 0xFF & ~ ( 1 < < col) ) ; if ( expander _status) goto out ;
out :
i2c_stop ( ) ;
}
} else {
// select on teensy
// Output low(DDR:1, PORT:0) to select
switch ( row ) {
case 6 :
DDRB | = ( 1 < < 1 ) ;
PORTB & = ~ ( 1 < < 1 ) ;
break ;
case 7 :
DDRB | = ( 1 < < 2 ) ;
PORTB & = ~ ( 1 < < 2 ) ;
break ;
case 8 :
DDRB | = ( 1 < < 3 ) ;
PORTB & = ~ ( 1 < < 3 ) ;
break ;
case 9 :
DDRD | = ( 1 < < 2 ) ;
PORTD & = ~ ( 1 < < 3 ) ;
break ;
case 10 :
DDRD | = ( 1 < < 3 ) ;
PORTD & = ~ ( 1 < < 3 ) ;
break ;
case 11 :
DDRC | = ( 1 < < 6 ) ;
PORTC & = ~ ( 1 < < 6 ) ;
break ;
}
uint8_t pin = onboard_col_pins [ col ] ;
_SFR_IO8 ( ( pin > > 4 ) + 1 ) | = _BV ( pin & 0xF ) ; // OUT
_SFR_IO8 ( ( pin > > 4 ) + 2 ) & = ~ _BV ( pin & 0xF ) ; // LOW
}
}
static void unselect_col ( uint8_t col )
{
if ( col_expanded [ col ] ) {
// No need to explicitly unselect expander pins--their I/O state is
// set simultaneously, with a single bitmask sent to i2c_write. When
// select_col selects a single pin, it implicitly unselects all the
// other ones.
} else {
// unselect on teensy
uint8_t pin = onboard_col_pins [ col ] ;
_SFR_IO8 ( ( pin > > 4 ) + 1 ) & = ~ _BV ( pin & 0xF ) ; // IN
_SFR_IO8 ( ( pin > > 4 ) + 2 ) | = _BV ( pin & 0xF ) ; // HI
}
}
static void unselect_cols ( void )
{
for ( uint8_t x = 0 ; x < MATRIX_COLS ; x + + ) {
unselect_col ( x ) ;
}
}
# endif
Erin Call
7 years ago
committed by
Jack Humbert