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authortmk2014-11-23 13:08:05 +0900
committertmk2014-11-23 13:08:05 +0900
commit608ebe2686bdb3fdbd0426731cabdf6082c57b53 (patch)
tree15d306082db9d53bb9c890f62aeeaf4cdab49712 /keyboard/hhkb_rn42/matrix.c
parentc2d830c07c823c48a17c214b093ec1bab989fb6a (diff)
Matrix power saving
Diffstat (limited to 'keyboard/hhkb_rn42/matrix.c')
-rw-r--r--keyboard/hhkb_rn42/matrix.c28
1 files changed, 26 insertions, 2 deletions
diff --git a/keyboard/hhkb_rn42/matrix.c b/keyboard/hhkb_rn42/matrix.c
index b0af4baa5..c6c444ff5 100644
--- a/keyboard/hhkb_rn42/matrix.c
+++ b/keyboard/hhkb_rn42/matrix.c
@@ -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;
+}