Diff: segment_driver.s

Revision:

0:67dbd54e60d4

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/segment_driver.s	Wed Nov 13 20:00:28 2013 +0000
@@ -0,0 +1,174 @@
+    AREA segment_driver, CODE, READONLY
+;--------------------OVERVIEW------------------------
+; This file contains ARM Assembly language functions to
+; drive a 7-segment LED Display (Kingbright SA03-11HDB).
+; This library uses a switch statement on the input
+; register (R0) to set or clear each corresponding lead
+; of the display.  NOTE: The 7 Segments of the LED display
+; must be connected to pins p11 - p17 of the mbed digital
+; I/O.  For further help with understanding this file,
+; please refer to files:
+;                       dig_in.s
+;                       dig_out.s
+;------------------------------------------------------
+; Import function locations so that C compiler can find it and link
+    IMPORT dig_out_P11
+    IMPORT P11_write
+    IMPORT dig_out_P12
+    IMPORT P12_write
+    IMPORT dig_out_P13
+    IMPORT P13_write
+    IMPORT dig_out_P14
+    IMPORT P14_write
+    IMPORT dig_out_P15
+    IMPORT P15_write
+    IMPORT dig_out_P16
+    IMPORT P16_write
+    IMPORT dig_out_P17
+    IMPORT P17_write
+; Export function location so that C compiler can find it and link
+    EXPORT seg_driver_initialize
+seg_driver_initialize       ;CLEAR DISPLAY
+    PUSH    {LR}
+    BL      dig_out_P11
+    BL      dig_out_P12
+    BL      dig_out_P13
+    BL      dig_out_P14
+    BL      dig_out_P15
+    BL      dig_out_P16
+    BL      dig_out_P17
+    MOV     R0,#1
+    BL      P11_write
+    BL      P12_write
+    BL      P13_write
+    BL      P14_write
+    BL      P15_write
+    BL      P16_write
+    BL      P17_write
+    POP     {LR}
+    BX      LR
+    
+; Export function location so that C compiler can find it and link    
+    EXPORT seg_driver
+seg_driver                  ;SWITCH STATEMENT
+    PUSH    {LR}
+    ADR     R2,switchpool
+    LDR     PC,[R2,R0,LSL #2]
+    ALIGN
+switchpool
+    DCD case0
+    DCD case1
+    DCD case2
+    DCD case3
+    DCD case4
+    DCD case5
+    DCD case6
+    DCD case7
+    DCD case8
+    DCD case9
+case0
+    MOV     R0,#0
+    BL      P11_write
+    BL      P12_write
+    BL      P13_write
+    BL      P14_write
+    BL      P15_write
+    BL      P16_write
+    MOV     R0,#1
+    BL      P17_write
+    B       end
+case1
+    MOV     R0,#0
+    BL      P12_write
+    BL      P13_write
+    MOV     R0,#1
+    BL      P11_write
+    BL      P14_write
+    BL      P15_write
+    BL      P16_write
+    BL      P17_write
+    B       end
+case2
+    MOV     R0,#0
+    BL      P11_write
+    BL      P12_write
+    BL      P14_write
+    BL      P15_write
+    BL      P17_write
+    MOV     R0,#1
+    BL      P13_write
+    BL      P16_write  
+    B       end
+case3
+    MOV     R0,#0
+    BL      P11_write
+    BL      P12_write
+    BL      P13_write
+    BL      P14_write   
+    BL      P17_write
+    MOV     R0,#1
+    BL      P15_write
+    BL      P16_write    
+    B       end
+case4
+    MOV     R0,#0    
+    BL      P12_write
+    BL      P13_write
+    BL      P16_write  
+    BL      P17_write
+    MOV     R0,#1
+    BL      P11_write
+    BL      P14_write
+    BL      P15_write       
+    B       end
+case5
+    B       end
+case6
+    MOV     R0,#0
+    BL      P11_write       
+    BL      P13_write
+    BL      P14_write
+    BL      P15_write
+    BL      P16_write  
+    BL      P17_write
+    MOV     R0,#1
+    BL      P12_write          
+    B       end
+case7
+    MOV     R0,#0
+    BL      P11_write
+    BL      P12_write       
+    BL      P13_write  
+    MOV     R0,#1
+    BL      P14_write  
+    BL      P15_write
+    BL      P16_write
+    BL      P17_write       
+    B       end
+case8
+    MOV     R0,#0
+    BL      P11_write
+    BL      P12_write       
+    BL      P13_write  
+    BL      P14_write  
+    BL      P15_write
+    BL      P16_write
+    BL      P17_write       
+    B       end
+case9
+    MOV     R0,#0
+    BL      P11_write
+    BL      P12_write       
+    BL      P13_write
+    BL      P16_write
+    BL      P17_write  
+    MOV     R0,#1
+    BL      P14_write  
+    BL      P15_write          
+    B       end
+end
+    POP     {LR}
+    BX      LR
+;
+    END
+