Try to use timer

15test_jal.asm

@@ -0,0 +1,19 @@
+    lui     $s0,            0x4000
+    addi    $s0,            $s0,        0x10
+main_loop:
+    addi    $s1,            $zero,      0x15b
+    sw      $s1,            0($s0)
+    jal     wait_for_time
+
+    addi    $s1,            $zero,      0x177
+    sw      $s1,            0($s0)
+    jal     wait_for_time
+    j       main_loop
+
+wait_for_time:
+    lui     $t0,            0xf
+    addi    $t0,            $t0,        0x7fff
+wait_loop:
+    addi    $t0,            $t0,        -1
+    bgtz    $t0,            wait_loop
+    jr      $ra

15test_jal.txt

@@ -0,0 +1,14 @@
+20'd0: instruction <= 32'h3c104000;
+20'd1: instruction <= 32'h22100010;
+20'd2: instruction <= 32'h2011015b;
+20'd3: instruction <= 32'hae110000;
+20'd4: instruction <= 32'h0c000009;
+20'd5: instruction <= 32'h20110177;
+20'd6: instruction <= 32'hae110000;
+20'd7: instruction <= 32'h0c000009;
+20'd8: instruction <= 32'h08000002;
+20'd9: instruction <= 32'h3c08000f;
+20'd10: instruction <= 32'h21087fff;
+20'd11: instruction <= 32'h2108ffff;
+20'd12: instruction <= 32'h1d00fffe;
+20'd13: instruction <= 32'h03e00008;

15test_jal_mars.txt

@@ -0,0 +1,14 @@
+3c104000
+22100010
+2011015b
+ae110000
+0c000009
+20110177
+ae110000
+0c000009
+08000002
+3c08000f
+21087fff
+2108ffff
+1d00fffe
+03e00008