powrms_gpios.c File Reference

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)

Copyright 2025(c) Analog Devices, Inc.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
3. Neither the name of Analog Devices, Inc. nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY ANALOG DEVICES, INC. "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL ANALOG DEVICES, INC. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

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.