initial isr. has problems.

include/isr.h

@@ -0,0 +1,22 @@
+#ifndef ISR_H
+#define ISR_H
+
+#include "embedded_types.h"
+
+#define INTBASE (0x80020000)
+#define INTENNUM_OFF (0x8)
+#define INTSRC_OFF (0x30)
+
+#define INTENNUM INTBASE + INTENNUM_OFF
+#define INTSRC   INTBASE + INTSRC_OFF 
+
+
+#define no_isrs() no_tmr_isr();
+
+#define enable_tmr_irq() *(volatile uint32_t *)(INTENNUM)
+#define no_tmr_isr() void tmr_isr(void) { return; }
+
+extern void tmr_isr(void);
+
+#endif
+

src/isr.c

@@ -0,0 +1,20 @@
+#include "embedded_types.h"
+#include "interrupt-utils.h"
+#include "isr.h"
+
+#define reg32(x) (*(volatile uint32_t *)(x))
+
+__attribute__ ((interrupt("IRQ"))) 
+void isr(void)
+{
+//	ISR_ENTRY();
+	/* check for TMR0 interrupt */
+//	tmr_isr(); // led turns off if I have this, indicating that the isr does jump to tmr_isr
+//	if(reg32(INTSRC) & (1<<5)) { tmr_isr(); }
+//	asm("SUBS PC,R14_IRQ,#4")
+//	enableIRQ(); // I think this is necessary, but the LED never turns off when I have this
+//	ISR_EXIT();  // behavior doesn't change if I have this or not. 
+
+/* putting anything in here breaks the other code :( */
+
+}