Added SPI driver

prj.conf

@@ -53,4 +53,12 @@ CONFIG_ASSERT=y
 # drivers
 CONFIG_PWM=y
 CONFIG_I2C=y
+
 CONFIG_PWM_LOG_LEVEL_DBG=y
+
+#SPI
+CONFIG_SPI=y
+CONFIG_NRFX_SPIM3=y
+CONFIG_NRFX_SPIM4=y
+CONFIG_SPI_ASYNC=y
+CONFIG_SPI_SLAVE=y

src/drivers/GPIO_INPUT/gpio_input_local.c

@@ -0,0 +1,9 @@
+#include "../../includes.h"
+#include "gpio_input_local.h"
+
+
+void button_pressed(const struct device *dev, struct gpio_callback *cb,
+					uint32_t pins)
+{
+	printk("Button pressed at %" PRIu32 "\n", k_cycle_get_32());
+}

src/drivers/GPIO_INPUT/gpio_input_local.h

@@ -0,0 +1,25 @@
+#include "../../includes.h"
+
+/*** Initilize GPIO input */
+/*
+ * Get button configuration from the devicetree sw0 alias. This is mandatory.
+ */
+#define SW0_NODE DT_ALIAS(sw0)
+#if !DT_NODE_HAS_STATUS(SW0_NODE, okay)
+#error "Unsupported board: sw0 devicetree alias is not defined"
+#endif
+
+static const struct gpio_dt_spec button = GPIO_DT_SPEC_GET_OR(SW0_NODE, gpios,
+															  {0});
+static struct gpio_callback button_cb_data;
+
+/*
+ * The led0 devicetree alias is optional. If present, we'll use it
+ * to turn on the LED whenever the button is pressed.
+ */
+static struct gpio_dt_spec led = GPIO_DT_SPEC_GET_OR(DT_ALIAS(led0), gpios,
+													 {0});
+
+
+void button_pressed(const struct device *dev, struct gpio_callback *cb,
+					uint32_t pins);

src/main.c

@@ -10,6 +10,9 @@
 #include "includes.h"
 #include "drivers/PWM/pwm_local.h"
 #include "drivers/SPIM/spim_local.h"
+#include "drivers/GPIO_INPUT/gpio_input_local.h"
+
+#define SLEEP_TIME_MS 1
 
 #define LOG_MODULE_NAME peripheral_uart
 LOG_MODULE_REGISTER(LOG_MODULE_NAME);
@@ -561,6 +564,8 @@ void main(void)
 	setDuty(pwm_led1, period, period / 2U);
 	setDuty(pwm_led2, period, period / 10U);
 	setDuty(pwm_led3, period, period / 10U);
+
+	spi_init();
 
 	err = uart_init();
 	if (err) {
@@ -610,6 +615,19 @@ void main(void)
 	for (;;) {
 		dk_set_led(RUN_STATUS_LED, (++blink_status) % 2);
 		k_sleep(K_MSEC(RUN_LED_BLINK_INTERVAL));
+
+		/* Interfacting with sensor using SPI */
+		err = gpio_pin_toggle_dt(&spi4_cs);
+		if (err < 0)
+		{
+			return;
+		}
+		k_msleep(SLEEP_TIME_MS);
+		spi_write_test_msg();
+		err = gpio_pin_toggle_dt(&spi4_cs);
+	    /* end sending info using SPI */	
+
+		k_sleep(K_SECONDS(4U));
 	}
 }