upiwin/src/gpio.c

93 lines
2.8 KiB
C
Raw Normal View History

2019-11-29 01:52:56 -07:00
#include <stdint.h>
#include <bcm2835.h>
#include "config.h"
2019-11-29 01:52:56 -07:00
#include "log.h"
#include "scode.h"
2019-11-29 02:05:30 -07:00
#include "gpio.h"
2019-11-29 01:52:56 -07:00
2019-12-07 13:07:59 -07:00
/* GPIO lines used by various peripheral devices */
#define GLINE_BUTTON1 17
#define GLINE_BUTTON2 22
#define GLINE_BUTTON3 23
#define GLINE_BUTTON4 27
#define GLINE_BACKLIGHT 18
2019-11-29 01:52:56 -07:00
2019-12-07 13:07:59 -07:00
#define PWM_BACKLIGHT 0 /* PWM channel used for backlight */
2019-11-29 01:52:56 -07:00
static void do_cleanup(void)
{
/* 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");
}
HRESULT Gpio_setup(void)
2019-11-29 01:52:56 -07:00
{
HRESULT hr;
if (!bcm2835_init())
{
Log(LFATAL, "Error initializing BCM2835 library");
return E_FAIL;
}
2019-11-29 01:52:56 -07:00
/* 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);
2019-11-29 01:52:56 -07:00
2019-12-01 14:34:57 -07:00
/* 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);
2019-12-01 15:43:05 -07:00
bcm2835_pwm_set_range(PWM_BACKLIGHT, GSB_BACKLIGHT_MAX + 1);
bcm2835_pwm_set_data(PWM_BACKLIGHT, GSB_BACKLIGHT_DEFAULT);
2019-11-29 01:52:56 -07:00
hr = Config_exitfunc(do_cleanup);
if (FAILED(hr))
do_cleanup();
return hr;
2019-11-29 01:52:56 -07:00
}
UINT32 Gpio_read_buttons(void)
{
UINT32 rc = 0;
if (bcm2835_gpio_lev(GLINE_BUTTON1) == LOW)
2019-12-01 15:45:46 -07:00
rc |= GRB_STATE_BUTTON1;
if (bcm2835_gpio_lev(GLINE_BUTTON2) == LOW)
2019-12-01 15:45:46 -07:00
rc |= GRB_STATE_BUTTON2;
if (bcm2835_gpio_lev(GLINE_BUTTON3) == LOW)
2019-12-01 15:45:46 -07:00
rc |= GRB_STATE_BUTTON3;
if (bcm2835_gpio_lev(GLINE_BUTTON4) == LOW)
2019-12-01 15:45:46 -07:00
rc |= GRB_STATE_BUTTON4;
2019-12-01 01:21:26 -07:00
return rc;
}
2019-12-01 14:34:57 -07:00
void Gpio_set_backlight(UINT32 level)
2019-12-01 14:34:57 -07:00
{
2019-12-01 15:43:05 -07:00
if (level > GSB_BACKLIGHT_MAX)
level = GSB_BACKLIGHT_MAX;
2019-12-01 14:34:57 -07:00
bcm2835_pwm_set_data(PWM_BACKLIGHT, level);
}