tweaks for fix microbit/emscripten builds

Author: gfwilliams

src/jsdevices.c

@@ -589,7 +589,7 @@ IOEventFlags jshPopIOEvent(uint8_t *data, unsigned int *length) {
   return evt;
 }
 
-// pop an IO event of type eventType, returns true on success
+// pop an IO event of type eventType, returns event type on success,EV_NONE on failure. data must be IOEVENT_MAX_LEN bytes
 IOEventFlags jshPopIOEventOfType(IOEventFlags eventType, uint8_t *data, unsigned int *length) {
   IOBufferIdx i = ioTail;
   while (ioHead!=i) {

src/jsinteractive.c

@@ -3021,9 +3021,10 @@ void jsiDebuggerLine(JsVar *line) {
 /** This is called from the parser if EXEC_RUN_INTERRUPT_JS is set.
 It executes JavaScript code that was pushed to the queue by require("timer").add({type:"EXEC", fn:myFunction... */
 void jsiRunInterruptingJS() {
-  uint8_t data[8];
+  uint8_t data[IOEVENT_MAX_LEN];
   memset(data, 0, sizeof(data));
-  if (jshPopIOEventOfType(EV_RUN_INTERRUPT_JS, data, sizeof(data)))
+  unsigned int len = sizeof(data)
+  if (jshPopIOEventOfType(EV_RUN_INTERRUPT_JS, data, &len))
     jsiOnRunInterruptJSEvent(data, sizeof(data));
 }
 

src/jstimer.h

@@ -52,6 +52,8 @@ typedef enum {
 #define UET_IS_BUFFER_WRITE_EVENT(T) (\
   ((T)==UET_WRITE_BYTE) || \
   ((T)==UET_WRITE_SHORT))
+#else
+#define UET_IS_BUFFER_EVENT(T) false
 #endif
 
 #define UTILTIMERTASK_PIN_COUNT (8)