Integrate timer module in top and add test program

programs/timer_test.prog

@@ -0,0 +1,56 @@
+reset:
+    br always >main
+    nop
+
+hardfault:
+    reti
+    nop
+
+memfault:
+    reti
+    nop
+
+timer_interrupt:
+    br >timer_interrupt_handler
+    nop
+
+.align
+led_addr: .word 0x000F0000
+timer_counter_addr: .word 0x000F0008
+timer_status_addr: .word 0x000F000C
+dmem_start_addr: .word 0x00000400
+dmem_end_addr: .word 0x000004FF
+priority_mask: .word 0xFFFFFF03
+
+main:
+    // Initialize stack pointer to the end of the data memory
+    ldr r12, >dmem_end_addr
+
+    // Set runtime priority
+    ldr r0, >priority_mask
+    and r14, r0, r14
+
+    ldr r0,>led_addr                // LED addr
+    ldr r1,>timer_status_addr      // Timer addr
+
+    // Set some LEDs
+    clr r2
+    addi r2, 0x5A
+    st08 r0, r2
+
+    // Enable the timer...
+    clr r2
+    addi r2, 0x1 // enable bit set
+    st08 r1, r2
+
+loop:
+    call >loop
+    nop
+
+
+timer_interrupt_handler:
+    // Set LEDs to indicate we reached the timer interrupt
+    clr r2
+    addi r2, -1
+    st08 r0, r2
+    reti