Diff: segment_display/setup.s

Revision:

0:532cb55d6136

diff -r 000000000000 -r 532cb55d6136 segment_display/setup.s
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/segment_display/setup.s	Wed Oct 29 01:21:34 2014 +0000
@@ -0,0 +1,42 @@
+    AREA setup, CODE, READONLY
+;--------------------OVERVIEW------------------------
+; This file contains ARM Assembly language functions to
+; initialize select registers/memory-locations in the
+; LPC1768 to predetermined values.  This startup sequence
+; will be used to test the integrity of your program, and
+; IT SHOULD NOT BE ALTERED BY ANY MEANS.  Any student
+; attempting to alter this file will be subject to academic
+; dishonesty and any disciplinary actions pertaining
+; thereto.
+;------------------------------------------------------
+; Export function location so that C compiler can find it and link
+    EXPORT setup_sequence
+setup_sequence
+    ;PUSH LINK REGISTER TO STACK
+    PUSH    {LR}
+    
+    ;INIT PINSEL0
+    LDR     R0, =0x4002C000     ;LOAD ADDRESS OF PINSEL0 REGISTER
+    LDR     R1, =0x40000000     ;LOAD BITMASK FOR PINSEL0 REGISTER
+    LDR     R2, [R0]            ;\ 
+    ORR     R2, R1              ;- APPLY BITMASK
+    STR     R2, [R0]            ;/ 
+    
+    ;INIT PINSEL1
+    LDR     R0, =0x4002C004     ;LOAD ADDRESS OF PINSEL1 REGISTER
+    LDR     R1, =0x00054015     ;LOAD BITMASK FOR PINSEL1 REGISTER
+    LDR     R2, [R0]            ;\ 
+    ORR     R2, R1              ;- APPLY BITMASK
+    STR     R2, [R0]            ;/ 
+    
+    ;INIT PINSEL3
+    LDR     R0, =0x4002C00C     ;LOAD ADDRESS OF PINSEL3 REGISTER
+    LDR     R1, =0x00004510     ;LOAD BITMASK FOR PINSEL4 REGISTER
+    LDR     R2, [R0]            ;\ 
+    ORR     R2, R1              ;- APPLY BITMASK
+    STR     R2, [R0]            ;/ 
+    
+    ;RETURN TO MAIN
+    POP     {LR}
+    BX      LR 
+    END
\ No newline at end of file