Johan Wikman / Mbed 2 deprecated Squirrel

The Squirrel interpreter for FRDM-K64F, extended with a set of classes that provide access to the mbed functionality (currently DigitalIn, DigitalInOut, DigitalOut, InterruptIn, PwmOut, Ticker, Timeout, Timer).

Dependencies:   SQUIRREL3 mbed sqbind-0_99

The Squirrel interpreter for FRDM-K64F.

NOTE: Currently of POC quality.

See http://www.squirrel-lang.org/ for information about the Squirrel language.

Currently the following (a subset of their functionality) mbed classes are available from within Squirrel:

  • DigitalIn
  • DigitalOut
  • DigitalInOut
  • PwmOut
  • Ticker
  • Timeout
  • Timer

In addition, InterruptIn is supported, but interrupts are noted when they occur, but only delivered from the main loop of the interpreter.

See also README.txt in the root of the project.

Diff: sqmbed/src/trigger.cpp

Revision:
0:6f55c7651ccc
Child:
1:540008bb92a2
diff -r 000000000000 -r 6f55c7651ccc sqmbed/src/trigger.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/sqmbed/src/trigger.cpp	Tue Dec 16 12:54:53 2014 +0000
@@ -0,0 +1,89 @@
+/*
+  @License@
+*/
+
+#include <sqmbed/trigger.h>
+#include <sqmbed/pointerstorage.h>
+
+namespace
+{
+
+class Triggers : public SqMbed::PointerStorage<SqMbed::Trigger>
+{
+public:
+    static void notify()
+    {
+        // Do not store pointers here. Who knows, maybe the handler creates a
+        // new InterruptIn and then both s_nSpace and s_ppInterrupts may change.
+        for (uint32_t i = 0; i < s_nSpace; ++i) {
+            SqMbed::Trigger* pTrigger = s_ppObjects[i];
+
+            if (pTrigger) {
+                pTrigger->call();
+            }
+        }
+    }
+};
+
+}
+
+namespace SqMbed
+{
+
+Trigger::Trigger(HSQUIRRELVM vm)
+    : m_vm(vm)
+    , m_triggered(false)
+{
+    m_object._type = OT_NULL;
+
+    Triggers::add(this);
+}
+
+Trigger::~Trigger()
+{
+    Triggers::remove(this);
+}
+
+bool Trigger::reserve()
+{
+    return Triggers::reserve();
+}
+
+void Trigger::call()
+{
+    if (m_triggered) {
+        m_triggered = false; // Should be atomic.
+
+        int top = sq_gettop(m_vm);
+        sq_pushobject(m_vm, m_object); // The function
+        sq_pushroottable(m_vm);        // This
+        sq_call(m_vm, 1, 0, 0);        // Only this as argument.
+        sq_settop(m_vm, top);          // Restore the stack.
+    }
+}
+
+// static
+void Trigger::flushTriggers()
+{
+    Triggers::notify();
+}
+
+void Trigger::attach(HSQOBJECT o)
+{
+    if (m_object._type != OT_NULL) {
+        sq_release(m_vm, &m_object);
+        m_object._type = OT_NULL;
+    }
+
+    m_object = o;
+    sq_addref(m_vm, &m_object);
+}
+
+// static
+void Trigger::triggered()
+{
+    // TODO: Should be atomic.
+    m_triggered = true;
+}
+
+}