Button handling implementation for eval-powrms project. More...

#include <stdbool.h>
#include <stdint.h>
#include "powrms_gpios.h"
#include "parameters.h"
#include "no_os_gpio.h"
#include "no_os_error.h"
#include "no_os_delay.h"
#include "no_os_irq.h"
#include "maxim_gpio_irq.h"
#include "example.h"
#include "no_os_print_log.h"

Include dependency graph for powrms_gpios.c:

Macros
#define	BTN_ON_OFF_HOLD_MS 250

#define	BTN_NEXT_FLAG (1 << 0)

#define	BTN_BACK_FLAG (1 << 1)

#define	BTN_ENTER_FLAG (1 << 2)

#define	BTN_ON_OFF_PIN 14

#define	BTN_BACK_PIN 17

#define	BTN_NEXT_PIN 16

#define	BTN_ENTER_PIN 18

#define	BTN_GPIO_PORT 0

Functions
int	buttons_init (void)
	Initialize button GPIO pins.

int	buttons_read (void)
	Read button states with debouncing.

void	configure_gpios_upon_startup ()
	Configure GPIOs upon system startup.

int	configure_gpios_upon_shutdown ()
	Configure GPIOs upon system shutdown.

Detailed Description

Button handling implementation for eval-powrms project.

Author: Robert Budai (rober.nosp@m.t.bu.nosp@m.dai@a.nosp@m.nalo.nosp@m.g.com)

SPDX-License-Identifier: BSD-3-Clause

Macro Definition Documentation

◆ BTN_BACK_FLAG

#define BTN_BACK_FLAG (1 << 1)

◆ BTN_BACK_PIN

#define BTN_BACK_PIN 17

◆ BTN_ENTER_FLAG

#define BTN_ENTER_FLAG (1 << 2)

◆ BTN_ENTER_PIN

#define BTN_ENTER_PIN 18

◆ BTN_GPIO_PORT

#define BTN_GPIO_PORT 0

◆ BTN_NEXT_FLAG

#define BTN_NEXT_FLAG (1 << 0)

◆ BTN_NEXT_PIN

#define BTN_NEXT_PIN 16

◆ BTN_ON_OFF_HOLD_MS

#define BTN_ON_OFF_HOLD_MS 250

◆ BTN_ON_OFF_PIN

#define BTN_ON_OFF_PIN 14

Function Documentation

◆ buttons_init()

int buttons_init ( void )

Initialize button GPIO pins.

Initialize interrupt-based button handling.

Configures GPIO pins 0.16, 0.17, and 0.18 as input pins with pull-up resistors for button functionality (NEXT, BACK, ENTER).

Returns: 0 on success, negative error code on failure

◆ buttons_read()

int buttons_read ( void )

Read button states with debouncing.

Read button states using interrupt flags.

Reads the current state of all buttons and applies debouncing logic to prevent false triggers from mechanical switch bounce.

Returns

Button press code:

0: No button pressed
1: NEXT button pressed (GPIO 0.17)
2: BACK button pressed (GPIO 0.16)
3: ENTER button pressed (GPIO 0.18)
4: ON_OFF latch held LOW for > 250 ms (GPIO 0.14)

◆ configure_gpios_upon_shutdown()

int configure_gpios_upon_shutdown ( )

Configure GPIOs upon system shutdown.

Safely powers down the system by disabling power rails and setting control signals to their safe states. Finally, triggers a system reset.

Returns: 0 on success, negative error code on failure

◆ configure_gpios_upon_startup()

void configure_gpios_upon_startup ( void )

Configure GPIOs upon system startup.

Sets up necessary GPIO pins for system operation, including enabling power rails and setting initial states for control signals.

Macros

Functions