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Matrix power saving

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This commit is contained in:
tmk 2014-11-23 13:08:05 +09:00
parent c2d830c07c
commit 608ebe2686
6 changed files with 60 additions and 6 deletions
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28
keyboard/hhkb_rn42/matrix.c
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@ -27,8 +27,16 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#include "timer.h"
#include "matrix.h"
#include "hhkb_avr.h"
#include <avr/wdt.h>
#include "suspend.h"
#include "lufa.h"
// matrix power saving
#define MATRIX_POWER_SAVE 10000
static uint32_t matrix_last_modified = 0;
static bool matrix_power = true;
// matrix state buffer(1:on, 0:off)
static matrix_row_t *matrix;
static matrix_row_t *matrix_prev;
@ -72,7 +80,7 @@ uint8_t matrix_scan(void)
matrix_prev = matrix;
matrix = tmp;
KEY_POWER_ON();
matrix_power_up();
for (uint8_t row = 0; row < MATRIX_ROWS; row++) {
for (uint8_t col = 0; col < MATRIX_COLS; col++) {
KEY_SELECT(row, col);
@ -126,8 +134,9 @@ uint8_t matrix_scan(void)
// This takes 25us or more to make sure KEY_STATE returns to idle state.
_delay_us(75);
}
if (matrix[row] ^ matrix_prev[row]) matrix_last_modified = timer_read32();
}
KEY_POWER_OFF();
matrix_power_down();
return 1;
}
@ -165,3 +174,18 @@ void matrix_print(void)
xprintf("%02X: %08b\n", row, bitrev(matrix_get_row(row)));
}
}
void matrix_power_up(void) {
if (matrix_power) return;
KEY_POWER_ON();
matrix_power = true;
}
void matrix_power_down(void) {
if (!matrix_power) return;
// doesn't power save while USB connection is active
if (USB_DeviceState == DEVICE_STATE_Configured) return;
if (timer_elapsed32(matrix_last_modified) <= MATRIX_POWER_SAVE) return;
KEY_POWER_OFF();
suspend_power_down(WDTO_15MS);
matrix_power = false;
}