nrf52dk: added examples

examples/nrf52dk/blink-hello/Makefile

@@ -0,0 +1,9 @@
+CONTIKI_PROJECT = blink-hello
+
+CONTIKI_WITH_RPL=0
+NRF52_WITHOUT_SOFTDEVICE=1
+
+all: $(CONTIKI_PROJECT) 
+
+CONTIKI = ../../..
+include $(CONTIKI)/Makefile.include

examples/nrf52dk/blink-hello/README.md

@@ -0,0 +1,14 @@
+Blink Hello example
+===================
+This example shows basic usage of DK's buttons and LEDs. It also shows basic 
+usage of Contiki's processes. The application autostarts 5 processes: 4 processes
+for button and LED control and 1 to display current temperature to the console.
+
+A process reacts to a press of a respective button (process 1 reacts to button 1, etc.)
+and doubles the current blinking frequency. The cycle restarts for beginning when blinking
+frequency is greater than 8Hz.  
+
+The example requires one DK and it doesn't use SoftDevice. To compile and flash the
+example run:
+
+	make TARGET=nrf52dk blink-hello.flash

examples/nrf52dk/blink-hello/blink-hello.c

@@ -0,0 +1,182 @@
+/* This is a very simple hello_world program.
+ * It aims to demonstrate the co-existence of two processes:
+ * One of them prints a hello world message and the other blinks the LEDs
+ *
+ * It is largely based on hello_world in $(CONTIKI)/examples/sensinode
+ *
+ * Author: George Oikonomou - <oikonomou@users.sourceforge.net>
+ */
+
+/**
+ * \addtogroup nrf52dk nRF52 Development Kit
+ * @{
+ *
+ * \addtogroup nrf52dk-examples Demo projects for nRF52 DK
+ * @{
+ *
+ * \defgroup nrf52dk-blink-hello Basic sensors and LEDs demo
+ * @{
+ *
+ * This demo demonstrates use of Contiki processes, sensors, and LEDs
+ * on nRF52 DK. Pressing a button will start a timer that blinks a
+ * respective LED (e.g., button 1 controls LED 1). Each time the button
+ * is pressed blinking frequency is doubled. On 4th press the LED is
+ * switched off and the sequence can be started from the beginning.
+ *
+ * \file Main file for Basic sensors and LEDs demo.
+ */
+#include <stdio.h> /* For printf() */
+#include <inttypes.h>
+#include "contiki.h"
+#include "dev/leds.h"
+#include "dev/temperature-sensor.h"
+#include "lib/sensors.h"
+#include "button-sensor.h"
+
+/*---------------------------------------------------------------------------*/
+PROCESS(blink_process_1, "LED1 blink process");
+PROCESS(blink_process_2, "LED2 blink process");
+PROCESS(blink_process_3, "LED3 blink process");
+PROCESS(blink_process_4, "LED4 blink process");
+PROCESS(temp, "Temperautre");
+
+AUTOSTART_PROCESSES(
+    &blink_process_1,
+    &blink_process_2,
+    &blink_process_3,
+    &blink_process_4,
+    &temp
+);
+
+struct blink_process_ctx {
+  struct etimer et_blink;
+  unsigned char c;
+  const struct sensors_sensor *button;
+  unsigned char led;
+};
+
+static void handle_event(process_event_t ev, process_data_t data, struct blink_process_ctx *ctx)
+{
+  if (ev == PROCESS_EVENT_TIMER && etimer_expired(&ctx->et_blink)) {
+    leds_toggle(ctx->led);
+    etimer_set(&ctx->et_blink, CLOCK_SECOND / ctx->c);
+    printf("Blink %d\n", ctx->led);
+  } else if (ev == sensors_event && data == ctx->button) {
+    if (ctx->button->value(BUTTON_SENSOR_VALUE_STATE) == 0) {
+      if (ctx->c == 0) {
+        ctx->c = 1;
+      } else if (ctx->c < 8){
+        ctx->c <<= 1;
+      } else {
+        ctx->c = 0;
+        leds_off(ctx->led);
+      }
+      if (ctx->c) {
+        etimer_set(&ctx->et_blink, CLOCK_SECOND / ctx->c);
+      } else {
+        etimer_stop(&ctx->et_blink);
+      }
+    }
+  }
+}
+
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(blink_process_1, ev, data)
+{
+  static struct blink_process_ctx ctx;
+
+  PROCESS_BEGIN();
+
+  ctx.button = &button_1;
+  ctx.c = 0;
+  ctx.led = LEDS_1;
+  ctx.button->configure(SENSORS_ACTIVE, 1);
+
+  while (1) {
+    PROCESS_WAIT_EVENT();
+    handle_event(ev, data, &ctx);
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(blink_process_2, ev, data)
+{
+  static struct blink_process_ctx ctx;
+
+  PROCESS_BEGIN();
+
+  ctx.button = &button_2;
+  ctx.c = 0;
+  ctx.led = LEDS_2;
+  ctx.button->configure(SENSORS_ACTIVE, 1);
+
+  while (1) {
+    PROCESS_WAIT_EVENT();
+    handle_event(ev, data, &ctx);
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(blink_process_3, ev, data)
+{
+  static struct blink_process_ctx ctx;
+
+  PROCESS_BEGIN();
+
+  ctx.button = &button_3;
+  ctx.c = 0;
+  ctx.led = LEDS_3;
+  ctx.button->configure(SENSORS_ACTIVE, 1);
+
+  while (1) {
+    PROCESS_WAIT_EVENT();
+    handle_event(ev, data, &ctx);
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(blink_process_4, ev, data)
+{
+  static struct blink_process_ctx ctx;
+
+  PROCESS_BEGIN();
+
+  ctx.button = &button_4;
+  ctx.c = 0;
+  ctx.led = LEDS_4;
+  ctx.button->configure(SENSORS_ACTIVE, 1);
+
+  while (1) {
+    PROCESS_WAIT_EVENT();
+    handle_event(ev, data, &ctx);
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(temp, ev, data)
+{
+  static struct etimer tick;
+  PROCESS_BEGIN();
+
+  etimer_set(&tick, CLOCK_SECOND);
+
+  while (1) {
+    PROCESS_WAIT_EVENT();
+    if (ev == PROCESS_EVENT_TIMER && etimer_expired(&tick)) {
+      int32_t temp = temperature_sensor.value(0);
+      printf("temp: %"PRId32".%02"PRId32"\n", temp >> 2, (temp & 0x03)*25);
+      etimer_reset(&tick);
+    }
+  }
+
+  PROCESS_END();
+}
+/**
+ * @}
+ * @}
+ * @}
+ */