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57 lines
1.3 KiB
C
Executable file
57 lines
1.3 KiB
C
Executable file
/*
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* Copyright (c) 2018 naehrwert
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "btn.h"
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#include "i2c.h"
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#include "gpio.h"
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#include "t210.h"
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u32 btn_read()
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{
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u32 res = 0;
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if (!gpio_read(GPIO_PORT_X, GPIO_PIN_7))
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res |= BTN_VOL_DOWN;
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if (!gpio_read(GPIO_PORT_X, GPIO_PIN_6))
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res |= BTN_VOL_UP;
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if (i2c_recv_byte(4, 0x3C, 0x15) & 0x4)
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res |= BTN_POWER;
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return res;
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}
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u32 btn_wait()
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{
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u32 res = 0, btn = btn_read();
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int pwr = 0;
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// Power button down, raise a filter.
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if (btn & BTN_POWER)
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{
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pwr = 1;
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btn &= 0xFFFFFFFE;
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}
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do
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{
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res = btn_read();
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// Power button up, remove filter.
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if (!(res & BTN_POWER) && pwr)
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pwr = 0;
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// Power button still down.
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else if (pwr)
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res &= 0xFFFFFFFE;
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} while (btn == res);
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return res;
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}
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