Configs button

code/nrf-connect/CMakeLists.txt

@@ -4,4 +4,10 @@ find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
 
 project(b_parasite)
 
-target_sources(app PRIVATE src/main.c src/prst/shtc3.c src/prst/adc.c src/prst/led.c)
+target_sources(app PRIVATE
+	src/main.c
+	src/prst/shtc3.c
+	src/prst/adc.c
+	src/prst/led.c
+	src/prst/button.c
+)

code/nrf-connect/boards/arm/bparasite_nrf52840/bparasite_nrf52840.dts

@@ -24,6 +24,14 @@
 		};
 	};
 
+	buttons {
+		compatible = "gpio-keys";
+		button0: button_0 {
+			gpios = <&gpio0 12 (GPIO_PULL_UP | GPIO_ACTIVE_LOW)>;
+			label = "Push button switch 0";
+		};
+	};
+
 	soil_pwm: soil_pwm {
 		compatible = "pwm-fixed";
 		pwms = <&pwm0 0 PWM_MSEC(100) PWM_POLARITY_INVERTED>;

code/nrf-connect/src/main.c

@@ -2,6 +2,7 @@
 #include <zephyr/zephyr.h>
 
 #include "prst/adc.h"
+#include "prst/button.h"
 #include "prst/led.h"
 #include "prst/macros.h"
 #include "prst/shtc3.h"
@@ -11,6 +12,9 @@ LOG_MODULE_REGISTER(main, LOG_LEVEL_DBG);
 int main(void) {
   RET_IF_ERR(prst_adc_init());
   RET_IF_ERR(prst_led_init());
+  RET_IF_ERR(prst_button_init());
+
+  RET_IF_ERR(prst_led_flash(2));
 
   prst_adc_read_t batt;
   prst_adc_soil_moisture_t soil;
@@ -25,8 +29,6 @@ int main(void) {
             soil.adc_read.voltage);
     LOG_INF("Photo: %u lx (%.3f mV)", photo.brightness, soil.adc_read.voltage);
 
-    prst_led_flash(3);
-
     k_msleep(500);
   }
 }

code/nrf-connect/src/prst/button.c

@@ -0,0 +1,29 @@
+#include "button.h"
+
+#include <drivers/gpio.h>
+#include <logging/log.h>
+
+#include "led.h"
+#include "macros.h"
+
+LOG_MODULE_REGISTER(button, LOG_LEVEL_DBG);
+
+static struct gpio_dt_spec button =
+    GPIO_DT_SPEC_GET(DT_NODELABEL(button0), gpios);
+
+static struct gpio_callback cb_data;
+
+static void button_pressed(const struct device *dev, struct gpio_callback *cb,
+                           uint32_t pins) {
+  LOG_INF("Button pressed");
+  prst_led_toggle();
+}
+
+int prst_button_init() {
+  RET_IF_ERR(!device_is_ready(button.port));
+  RET_IF_ERR(gpio_pin_configure_dt(&button, GPIO_INPUT));
+  RET_IF_ERR(gpio_pin_interrupt_configure_dt(&button, GPIO_INT_EDGE_TO_ACTIVE));
+  gpio_init_callback(&cb_data, button_pressed, BIT(button.pin));
+  RET_IF_ERR(gpio_add_callback(button.port, &cb_data));
+  return 0;
+}

code/nrf-connect/src/prst/button.h

@@ -0,0 +1,7 @@
+#ifndef _PRST_BUTTON_H_
+#define _PRST_BUTTON_H_
+
+// Inits button driver and registers callback.
+int prst_button_init();
+
+#endif  // _PRST_BUTTON_H_

code/nrf-connect/src/prst/led.c

@@ -9,9 +9,6 @@ LOG_MODULE_REGISTER(led, LOG_LEVEL_DBG);
 struct gpio_dt_spec led = GPIO_DT_SPEC_GET(DT_NODELABEL(led0), gpios);
 
 int prst_led_init() {
-  if (!device_is_ready(led.port)) {
-    LOG_ERR("DEV NOT READY");
-    return -1;
-  }
+  RET_IF_ERR(!device_is_ready(led.port));
   return gpio_pin_configure_dt(&led, GPIO_OUTPUT);
 }

code/nrf-connect/src/prst/led.h

@@ -20,11 +20,15 @@ static inline int prst_led_off() {
   return gpio_pin_set_dt(&led, 0);
 }
 
+static inline int prst_led_toggle() {
+  return gpio_pin_toggle_dt(&led);
+}
+
 static inline int prst_led_flash(int times) {
   LOG_MODULE_DECLARE(led, LOG_LEVEL_DBG);
   RET_IF_ERR(prst_led_off());
   for (int i = 0; i < 2 * times; i++) {
-    RET_IF_ERR(gpio_pin_toggle_dt(&led));
+    RET_IF_ERR(prst_led_toggle());
     k_msleep(PRST_LED_FLASH_PERIOD_MS / 2);
   }
   return 0;