From 608ebe2686bdb3fdbd0426731cabdf6082c57b53 Mon Sep 17 00:00:00 2001 From: tmk Date: Sun, 23 Nov 2014 13:08:05 +0900 Subject: Matrix power saving --- keyboard/hhkb_rn42/matrix.c | 28 ++++++++++++++++++++++++++-- 1 file changed, 26 insertions(+), 2 deletions(-) (limited to 'keyboard/hhkb_rn42/matrix.c') 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 . #include "timer.h" #include "matrix.h" #include "hhkb_avr.h" +#include +#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; +} -- cgit v1.2.3