all

2026-06-12 02:55:04 -07:00
commit 30406f4f49
2040 changed files with 571534 additions and 0 deletions
--- a/RTOS_Labs_common/CriticalSection.s
+++ b/RTOS_Labs_common/CriticalSection.s
@@ -0,0 +1,22 @@
+     .text
+     .thumb
+     .align 2
+     .global  StartCritical
+     .global  EndCritical 
+
+// *********** StartCritical ************************
+//make a copy of previous I bit, disable interrupts
+// inputs :  none
+// outputs : R0=previous I bit
+StartCritical:
+        MRS    R0, PRIMASK  // save old status
+        CPSID  I            // mask all (except faults)
+        BX     LR
+
+// *********** EndCritical ************************
+// using the copy of previous I bit, restore I bit to previous value
+// inputs :  R0=previous I bit
+// outputs : none
+EndCritical:
+        MSR    PRIMASK, R0
+        BX     LR