upiwin/src/gpio.c

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2.6 KiB
C
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#include <stdint.h>
#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
#define GLINE_BUTTON2 22
#define GLINE_BUTTON3 23
#define GLINE_BUTTON4 27
#define GLINE_BACKLIGHT 18
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#define PWM_BACKLIGHT 0
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int Gpio_setup(void)
{
if (!bcm2835_init())
{
Log(LFATAL, "Error initializing BCM2835 library");
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return -1;
}
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/* configure the buttons */
bcm2835_gpio_set_pud(GLINE_BUTTON1, BCM2835_GPIO_PUD_UP);
bcm2835_gpio_fsel(GLINE_BUTTON1, BCM2835_GPIO_FSEL_INPT);
bcm2835_gpio_set_pud(GLINE_BUTTON2, BCM2835_GPIO_PUD_UP);
bcm2835_gpio_fsel(GLINE_BUTTON2, BCM2835_GPIO_FSEL_INPT);
bcm2835_gpio_set_pud(GLINE_BUTTON3, BCM2835_GPIO_PUD_UP);
bcm2835_gpio_fsel(GLINE_BUTTON3, BCM2835_GPIO_FSEL_INPT);
bcm2835_gpio_set_pud(GLINE_BUTTON4, BCM2835_GPIO_PUD_UP);
bcm2835_gpio_fsel(GLINE_BUTTON4, BCM2835_GPIO_FSEL_INPT);
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/* configure the PWM for the backlight */
bcm2835_gpio_set_pud(GLINE_BACKLIGHT, BCM2835_GPIO_PUD_OFF);
bcm2835_gpio_fsel(GLINE_BACKLIGHT, BCM2835_GPIO_FSEL_ALT5);
bcm2835_pwm_set_clock(BCM2835_PWM_CLOCK_DIVIDER_2);
bcm2835_pwm_set_mode(PWM_BACKLIGHT, 1, 1);
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bcm2835_pwm_set_range(PWM_BACKLIGHT, GSB_BACKLIGHT_MAX + 1);
bcm2835_pwm_set_data(PWM_BACKLIGHT, GSB_BACKLIGHT_MAX);
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return 0;
}
void Gpio_cleanup(void)
{
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/* close down the backlight lines */
bcm2835_pwm_set_mode(PWM_BACKLIGHT, 1, 0);
bcm2835_gpio_set_pud(GLINE_BACKLIGHT, BCM2835_GPIO_PUD_OFF);
bcm2835_gpio_fsel(GLINE_BACKLIGHT, BCM2835_GPIO_FSEL_INPT);
/* close down the button lines */
bcm2835_gpio_set_pud(GLINE_BUTTON1, BCM2835_GPIO_PUD_OFF);
bcm2835_gpio_fsel(GLINE_BUTTON1, BCM2835_GPIO_FSEL_INPT);
bcm2835_gpio_set_pud(GLINE_BUTTON2, BCM2835_GPIO_PUD_OFF);
bcm2835_gpio_fsel(GLINE_BUTTON2, BCM2835_GPIO_FSEL_INPT);
bcm2835_gpio_set_pud(GLINE_BUTTON3, BCM2835_GPIO_PUD_OFF);
bcm2835_gpio_fsel(GLINE_BUTTON3, BCM2835_GPIO_FSEL_INPT);
bcm2835_gpio_set_pud(GLINE_BUTTON4, BCM2835_GPIO_PUD_OFF);
bcm2835_gpio_fsel(GLINE_BUTTON4, BCM2835_GPIO_FSEL_INPT);
if (!bcm2835_close())
Log(LWARN, "Closing BCM2835 library failed");
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}
int Gpio_read_buttons(void)
{
int rc = 0;
if (bcm2835_gpio_lev(GLINE_BUTTON1) == LOW)
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rc |= GRB_STATE_BUTTON1;
if (bcm2835_gpio_lev(GLINE_BUTTON2) == LOW)
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rc |= GRB_STATE_BUTTON2;
if (bcm2835_gpio_lev(GLINE_BUTTON3) == LOW)
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rc |= GRB_STATE_BUTTON3;
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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void Gpio_set_backlight(unsigned level)
{
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if (level > GSB_BACKLIGHT_MAX)
level = GSB_BACKLIGHT_MAX;
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bcm2835_pwm_set_data(PWM_BACKLIGHT, level);
}