Merge pull request #47 from stevenewald/echavemann/demo-code

Demo Code

Author: stevenewald

src/entrypoint.cpp

@@ -9,6 +9,8 @@
 extern void ipc_part1(void);
 extern void ipc_part2(void);
 extern void exception_task(void);
+extern void spinlock_task(void);
+extern void ending_task(void);
 extern void captouch_task(void);
 
 int main(void)
@@ -23,5 +25,8 @@ int main(void)
     edge::scheduler.add_task(ipc_part1);
     edge::scheduler.add_task(ipc_part2);
 
+    edge::scheduler.add_task(spinlock_task);
+    edge::scheduler.add_task(ending_task);
+
     edge::scheduler.start_scheduler();
 }

src/scheduler/pending_process_callbacks.cpp

@@ -15,7 +15,7 @@ void PendingProcessCallbacks::add_ready_callback(
 )
 {
     if (ready_callbacks[process_id].size() == MAX_READY_CALLBACKS) {
-        printf("Process %d is OUT OF SPACE FOR CALLBACKS\n", process_id);
+        // printf("Process %d is OUT OF SPACE FOR CALLBACKS\n", process_id);
         return;
     }
     ready_callbacks[process_id].emplace_back(callback, arg1, arg2);

src/scheduler/user_callback_storage.cpp

@@ -20,7 +20,9 @@ void UserCallbackStorage::set_callback(ProcessId id, ProcessCallbackPtr ptr)
 void UserCallbackStorage::call_callback(ProcessId id, int arg1, int arg2)
 {
     if (!has_callback(id)) {
-        panic("Attempted to call callback when it has not been set");
+        printf(
+            "Attempted to call callback when it has not been set for process %d\n", id
+        );
     }
 
     PendingProcessCallbacks::get().add_ready_callback(id, callbacks_[id], arg1, arg2);

src/user_programs/user_program_ending.cpp

@@ -0,0 +1,18 @@
+#include "userlib/syscalls.hpp"
+
+#include <cstdio>
+
+void ending_task(void)
+{
+    using namespace edge::userlib;
+    volatile int i = 0;
+    bool enabled = true;
+    while (i < 5'000'000) {
+        if (i % 1'000'000 == 0) {
+            edge::userlib::set_led(0, 0, enabled);
+            enabled = !enabled;
+        }
+        i = i + 1;
+    }
+    debug_print("Ending Task: Done Running. 0,0 should stop changing.\n");
+}

src/user_programs/user_program_ipc_part_2.cpp

@@ -8,10 +8,14 @@ void ipc_part2(void)
     static void (*on_button_press)(ButtonType, ButtonState) = [](ButtonType type,
                                                                  ButtonState state) {
         if (state == ButtonState::DOWN) {
-            if (type == ButtonType::A)
+            if (type == ButtonType::A) {
+                edge::userlib::debug_print("Button A pressed\n");
                 send_ipc("LED_DISPLAY", true);
-            else
+            }
+            else {
                 send_ipc("LED_DISPLAY", false);
+                edge::userlib::debug_print("Button B pressed\n");
+            }
         }
     };
 

src/user_programs/user_program_spinlock.cpp

@@ -0,0 +1,12 @@
+#include "nrf_delay.h"
+#include "userlib/syscalls.hpp"
+
+#include <cstdint>
+
+void spinlock_task(void)
+{
+    while (1) {
+        nrf_delay_ms(1000);
+        edge::userlib::debug_print("Spinlock Task : Still Spinlocked.\n");
+    }
+}