112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/*
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* UPIWIN - Micro Pi Windowing Framework Kernel
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* Copyright (C) 2019 Amy Bowersox/Erbosoft Metaverse Design Solutions
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*-------------------------------------------------------------------------
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*/
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#include <stdint.h>
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#include <bcm2835.h>
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#include "config.h"
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#include "log.h"
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#include "scode.h"
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#include "gpio.h"
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/* GPIO lines used by various peripheral devices */
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#define GLINE_BUTTON1 17
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#define GLINE_BUTTON2 22
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#define GLINE_BUTTON3 23
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#define GLINE_BUTTON4 27
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#define GLINE_BACKLIGHT 18
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#define PWM_BACKLIGHT 0 /* PWM channel used for backlight */
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static void do_cleanup(void)
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{
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/* close down the backlight lines */
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bcm2835_pwm_set_mode(PWM_BACKLIGHT, 1, 0);
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bcm2835_gpio_set_pud(GLINE_BACKLIGHT, BCM2835_GPIO_PUD_OFF);
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bcm2835_gpio_fsel(GLINE_BACKLIGHT, BCM2835_GPIO_FSEL_INPT);
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/* close down the button lines */
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bcm2835_gpio_set_pud(GLINE_BUTTON1, BCM2835_GPIO_PUD_OFF);
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bcm2835_gpio_fsel(GLINE_BUTTON1, BCM2835_GPIO_FSEL_INPT);
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bcm2835_gpio_set_pud(GLINE_BUTTON2, BCM2835_GPIO_PUD_OFF);
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bcm2835_gpio_fsel(GLINE_BUTTON2, BCM2835_GPIO_FSEL_INPT);
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bcm2835_gpio_set_pud(GLINE_BUTTON3, BCM2835_GPIO_PUD_OFF);
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bcm2835_gpio_fsel(GLINE_BUTTON3, BCM2835_GPIO_FSEL_INPT);
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bcm2835_gpio_set_pud(GLINE_BUTTON4, BCM2835_GPIO_PUD_OFF);
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bcm2835_gpio_fsel(GLINE_BUTTON4, BCM2835_GPIO_FSEL_INPT);
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if (!bcm2835_close())
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Log(LWARN, "Closing BCM2835 library failed");
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}
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HRESULT Gpio_setup(void)
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{
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HRESULT hr;
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if (!bcm2835_init())
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{
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Log(LFATAL, "Error initializing BCM2835 library");
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return E_FAIL;
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}
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/* configure the buttons */
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bcm2835_gpio_set_pud(GLINE_BUTTON1, BCM2835_GPIO_PUD_UP);
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bcm2835_gpio_fsel(GLINE_BUTTON1, BCM2835_GPIO_FSEL_INPT);
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bcm2835_gpio_set_pud(GLINE_BUTTON2, BCM2835_GPIO_PUD_UP);
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bcm2835_gpio_fsel(GLINE_BUTTON2, BCM2835_GPIO_FSEL_INPT);
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bcm2835_gpio_set_pud(GLINE_BUTTON3, BCM2835_GPIO_PUD_UP);
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bcm2835_gpio_fsel(GLINE_BUTTON3, BCM2835_GPIO_FSEL_INPT);
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bcm2835_gpio_set_pud(GLINE_BUTTON4, BCM2835_GPIO_PUD_UP);
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bcm2835_gpio_fsel(GLINE_BUTTON4, BCM2835_GPIO_FSEL_INPT);
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/* configure the PWM for the backlight */
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bcm2835_gpio_set_pud(GLINE_BACKLIGHT, BCM2835_GPIO_PUD_OFF);
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bcm2835_gpio_fsel(GLINE_BACKLIGHT, BCM2835_GPIO_FSEL_ALT5);
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bcm2835_pwm_set_clock(BCM2835_PWM_CLOCK_DIVIDER_2);
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bcm2835_pwm_set_mode(PWM_BACKLIGHT, 1, 1);
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bcm2835_pwm_set_range(PWM_BACKLIGHT, GSB_BACKLIGHT_MAX + 1);
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bcm2835_pwm_set_data(PWM_BACKLIGHT, GSB_BACKLIGHT_DEFAULT);
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hr = Config_exitfunc(do_cleanup);
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if (FAILED(hr))
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do_cleanup();
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return hr;
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}
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UINT32 Gpio_read_buttons(void)
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{
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UINT32 rc = 0;
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if (bcm2835_gpio_lev(GLINE_BUTTON1) == LOW)
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rc |= GRB_STATE_BUTTON1;
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if (bcm2835_gpio_lev(GLINE_BUTTON2) == LOW)
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rc |= GRB_STATE_BUTTON2;
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if (bcm2835_gpio_lev(GLINE_BUTTON3) == LOW)
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rc |= GRB_STATE_BUTTON3;
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if (bcm2835_gpio_lev(GLINE_BUTTON4) == LOW)
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rc |= GRB_STATE_BUTTON4;
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return rc;
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}
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void Gpio_set_backlight(UINT32 level)
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{
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if (level > GSB_BACKLIGHT_MAX)
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level = GSB_BACKLIGHT_MAX;
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bcm2835_pwm_set_data(PWM_BACKLIGHT, level);
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}
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