77 lines
2.1 KiB
C
77 lines
2.1 KiB
C
#include <stddef.h>
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#include <stdint.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/mman.h>
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#include <bcm2835.h>
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#include "log.h"
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#include "gpio.h"
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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 STATE_BUTTON1 (1 << 0)
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#define STATE_BUTTON2 (1 << 1)
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#define STATE_BUTTON3 (1 << 2)
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#define STATE_BUTTON4 (1 << 3)
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int Gpio_setup(void)
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{
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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 -1;
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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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/* TODO: other setup */
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return 0;
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}
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void Gpio_cleanup(void)
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{
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/* TODO: additional cleanup may be required */
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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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int Gpio_read_buttons(void)
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{
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int rc = 0;
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if (bcm2835_gpio_lev(GLINE_BUTTON1) == LOW)
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rc |= STATE_BUTTON1;
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if (bcm2835_gpio_lev(GLINE_BUTTON2) == LOW)
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rc |= STATE_BUTTON2;
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if (bcm2835_gpio_lev(GLINE_BUTTON3) == LOW)
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rc |= STATE_BUTTON3;
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if (bcm2835_gpio_lev(GLINE_BUTTON4) == LOW)
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rc |= STATE_BUTTON4;
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return rc;
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}
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