Add Sys_Tick example application

.vscode/tasks.json

@@ -1,21 +1,25 @@
 {
-    // See https://go.microsoft.com/fwlink/?LinkId=733558
-    // for the documentation about the tasks.json format
     "version": "2.0.0",
     "options": {
         "env": {
-            "PLATFORM": "nrf52",
-            // "PLATFORM": "posix",
             "APPLICATION": "blinky",
             // "APPLICATION": "spi",
             // "APPLICATION": "st7789_lcd",
+            // "APPLICATION": "sys_tick",
+            "${BUILD_CMD}": "eval docker run --env PLATFORM=${PLATFORM} --env APPLICATION=${APPLICATION} -t --rm -v '${workspaceFolder}':/work --user $(id -u):$(id -g) arm-none-eabi.buildenv",
         },
     },
+    "presentation": {
+        "focus": true,
+        "reveal": "always",
+        "panel": "shared",
+        "clear": true,
+    },
     "tasks": [
         {
             "label": "all",
             "type":"shell",
-            "command": "make all -j8",
+            "command": "${BUILD_CMD} make all -j8",
             "problemMatcher": {
                 "base": "$gcc",
                 "owner": "gcc",
@@ -49,7 +53,7 @@
         {
             "label": "clean",
             "type":"shell",
-            "command": "make clean -j8",
+            "command": "${BUILD_CMD} make clean -j8",
             "problemMatcher": {
                 "base": "$gcc",
                 "owner": "gcc",
@@ -66,7 +70,7 @@
         {
             "label": "distclean",
             "type":"shell",
-            "command": "make distclean",
+            "command": "${BUILD_CMD} make distclean",
             "problemMatcher": {
                 "base": "$gcc",
                 "owner": "gcc",
@@ -97,11 +101,5 @@
                 "isDefault": true
             }
         }
-    ],
+    ]
-    "presentation": {
-        "focus": true,
-        "reveal": "always",
-        "panel": "shared",
-        "clear": true,
-    }
 }

src/application/sys_tick/main.cc

@@ -0,0 +1,47 @@
+#include <array>
+
+extern "C" {
+    #include "nrf52.h"
+}
+
+#include "platform/nrf52/gpio.h"
+#include "platform/nrf52/InterruptHandler.h"
+#include "platform/nrf52/InterruptGuardian.h"
+#include "platform/cm4/SystemTick.h"
+
+using namespace pinetime::platform::nrf52;
+
+enum {
+    PIN_NUMBER_LED_1 = 17,
+    PIN_NUMBER_LED_2 = 18,
+    PIN_NUMBER_LED_3 = 19,
+    PIN_NUMBER_LED_4 = 20
+};
+
+Gpio led_1(PIN_NUMBER_LED_1);
+Gpio led_2(PIN_NUMBER_LED_2);
+Gpio led_3(PIN_NUMBER_LED_3);
+Gpio led_4(PIN_NUMBER_LED_4);
+
+std::array<Gpio *, 4> leds = {&led_1, &led_2, &led_3, &led_4};
+
+InterruptGuardian InterruptGuardian::instance;
+
+pinetime::platform::cm4::SystemTick ticker;
+
+int main(void)
+{
+    ticker.enable();
+    uint32_t last_tick = 0;
+    while(true) {
+        for(auto it = std::begin(leds); it != std::end(leds); ++it) {
+            uint32_t tick = ticker.tick() / 1000;
+            if(tick != last_tick) {
+                Gpio * tmp = *it;
+                tmp->toggle();
+            }
+            last_tick = tick;
+        }
+    }
+    return 0;
+}