irq: Add an irq_poll() stub for board code

Allow the board specific code to run checks prior to running each
task.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>

src/avr/irq.h

@@ -28,4 +28,7 @@ static inline void irq_restore(irqstatus_t flag) {
     SREG = flag;
 }
 
+static inline void irq_poll(void) {
+}
+
 #endif // irq.h

src/command.c

@@ -7,6 +7,7 @@
 #include <stdarg.h> // va_start
 #include <string.h> // memcpy
 #include "board/io.h" // readb
+#include "board/irq.h" // irq_poll
 #include "board/misc.h" // crc16_ccitt
 #include "board/pgm.h" // READP
 #include "command.h" // output_P
@@ -306,6 +307,7 @@ command_task(void)
         p = parsef(p, msgend, cp, args);
         if (!p)
             break;
+        irq_poll();
         void (*func)(uint32_t*) = READP(cp->func);
         func(args);
     }

src/generic/armcm_irq.c

@@ -34,6 +34,11 @@ irq_restore(irqstatus_t flag)
     asm volatile("msr primask, %0" :: "r" (flag) : "memory");
 }
 
+void
+irq_poll(void)
+{
+}
+
 // Clear the active irq if a shutdown happened in an irq handler
 static void
 clear_active_irq(void)

src/generic/irq.h

@@ -9,5 +9,6 @@ void irq_disable(void);
 void irq_enable(void);
 irqstatus_t irq_save(void);
 void irq_restore(irqstatus_t flag);
+void irq_poll(void);
 
 #endif // irq.h

src/sched.c

@@ -268,6 +268,7 @@ run_task(void)
 {
     struct callback_handler *p;
     foreachdecl(p, taskfuncs) {
+        irq_poll();
         void (*func)(void) = READP(p->func);
         func();
     }

src/simulator/main.c

@@ -47,6 +47,11 @@ irq_restore(irqstatus_t flag)
     Interrupt_off = flag;
 }
 
+void
+irq_poll(void)
+{
+}
+
 
 /****************************************************************
  * Timers