| /* |
| * Copyright (c) 2017 Intel Corporation |
| * |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| |
| #include <zephyr/zephyr.h> |
| #include <zephyr/sys/printk.h> |
| #include <zephyr/drivers/gpio.h> |
| #include <zephyr/drivers/pwm.h> |
| #include <zephyr/device.h> |
| |
| #include <zephyr/display/mb_display.h> |
| |
| #define BUZZER_PWM_CHANNEL 0 |
| |
| #define PERIOD_MIN 50 |
| #define PERIOD_MAX 3900 |
| #define PERIOD_INIT 1500 |
| |
| #define BEEP_DURATION K_MSEC(60) |
| |
| #define US_TO_HZ(_us) (USEC_PER_SEC / (_us)) |
| |
| static const struct device *pwm; |
| static const struct device *gpio; |
| static uint32_t period = PERIOD_INIT; |
| static struct k_work beep_work; |
| static volatile bool beep_active; |
| |
| static void beep(struct k_work *work) |
| { |
| /* The "period / 2" pulse duration gives 50% duty cycle, which |
| * should result in the maximum sound volume. |
| */ |
| pwm_set(pwm, BUZZER_PWM_CHANNEL, PWM_USEC(period), PWM_USEC(period) / 2U, 0); |
| k_sleep(BEEP_DURATION); |
| |
| /* Disable the PWM */ |
| pwm_set(pwm, BUZZER_PWM_CHANNEL, 0, 0, 0); |
| |
| /* Ensure there's a clear silent period between two tones */ |
| k_sleep(K_MSEC(50)); |
| beep_active = false; |
| } |
| |
| static void button_pressed(const struct device *dev, struct gpio_callback *cb, |
| uint32_t pins) |
| { |
| struct mb_display *disp; |
| |
| if (beep_active) { |
| printk("Button press while beeping\n"); |
| return; |
| } |
| |
| beep_active = true; |
| |
| if (pins & BIT(DT_GPIO_PIN(DT_ALIAS(sw0), gpios))) { |
| printk("A pressed\n"); |
| if (period < PERIOD_MAX) { |
| period += 50U; |
| } |
| } else { |
| printk("B pressed\n"); |
| if (period > PERIOD_MIN) { |
| period -= 50U; |
| } |
| } |
| |
| printk("Period is %u us (%u Hz)\n", period, US_TO_HZ(period)); |
| |
| disp = mb_display_get(); |
| mb_display_print(disp, MB_DISPLAY_MODE_DEFAULT, 500, "%uHz", |
| US_TO_HZ(period)); |
| |
| k_work_submit(&beep_work); |
| } |
| |
| void main(void) |
| { |
| static struct gpio_callback button_cb_data; |
| |
| gpio = device_get_binding(DT_GPIO_LABEL(DT_ALIAS(sw0), gpios)); |
| |
| gpio_pin_configure(gpio, DT_GPIO_PIN(DT_ALIAS(sw0), gpios), |
| DT_GPIO_FLAGS(DT_ALIAS(sw0), gpios) | GPIO_INPUT); |
| gpio_pin_configure(gpio, DT_GPIO_PIN(DT_ALIAS(sw1), gpios), |
| DT_GPIO_FLAGS(DT_ALIAS(sw1), gpios) | GPIO_INPUT); |
| |
| gpio_pin_interrupt_configure(gpio, DT_GPIO_PIN(DT_ALIAS(sw0), gpios), |
| GPIO_INT_EDGE_TO_ACTIVE); |
| |
| gpio_pin_interrupt_configure(gpio, DT_GPIO_PIN(DT_ALIAS(sw1), gpios), |
| GPIO_INT_EDGE_TO_ACTIVE); |
| |
| gpio_init_callback(&button_cb_data, button_pressed, |
| BIT(DT_GPIO_PIN(DT_ALIAS(sw0), gpios)) | |
| BIT(DT_GPIO_PIN(DT_ALIAS(sw1), gpios))); |
| |
| pwm = device_get_binding(DT_LABEL(DT_INST(0, nordic_nrf_sw_pwm))); |
| |
| k_work_init(&beep_work, beep); |
| /* Notify with a beep that we've started */ |
| k_work_submit(&beep_work); |
| |
| gpio_add_callback(gpio, &button_cb_data); |
| } |