📄 irq.lst
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ARM COMPILER V2.53, irq 24/10/06 20:29:56 PAGE 1
ARM COMPILER V2.53, COMPILATION OF MODULE irq
OBJECT MODULE PLACED IN .\Obj\irq.obj
COMPILER INVOKED BY: d:\Keil\ARM\BIN\CA.exe ..\Common\src\irq.c THUMB INCDIR(..\Common\inc) DEBUG PRINT(.\LST\IRQ.LST) T
-ABS(4) OBJECT(.\Obj\irq.obj)
stmt level source
1 /*****************************************************************************
2 * irq.c: Interrupt handler C file for Philips LPC214x Family Microprocessors
3 *
4 * Copyright(C) 2006, Philips Semiconductor
5 * All rights reserved.
6 *
7 * History
8 * 2005.10.01 ver 1.00 Prelimnary version, first Release
9 *
10 ******************************************************************************/
11 #include "LPC214x.h" /* LPC23XX Peripheral Registers */
12 #include "type.h"
13 #include "irq.h"
14
15 /******************************************************************************
16 ** Function name: DefaultVICHandler
17 **
18 ** Descriptions: Default VIC interrupt handler.
19 ** This handler is set to deal with spurious
20 ** interrupt.
21 ** If the IRQ service routine reads the VIC
22 ** address register, and no IRQ slot responses
23 ** as described above, this address is returned.
24 ** parameters: None
25 ** Returned value: None
26 **
27 ******************************************************************************/
28 void DefaultVICHandler (void) __irq
29 {
30 1 /* if the IRQ is not installed into the VIC, and interrupt occurs, the
31 1 default interrupt VIC address will be used. This could happen in a race
32 1 condition. For debugging, use this endless loop to trace back. */
33 1 /* For more details, see Philips appnote AN10414 */
34 1 VICVectAddr = 0; /* Acknowledge Interrupt */
35 1 while ( 1 );
36 1 }
37
38 /* Initialize the interrupt controller */
39 /******************************************************************************
40 ** Function name: init_VIC
41 **
42 ** Descriptions: Initialize VIC interrupt controller.
43 ** parameters: None
44 ** Returned value: None
45 **
46 ******************************************************************************/
47 void init_VIC(void)
48 {
49 1 DWORD i = 0;
50 1 DWORD *vect_addr, *vect_cntl;
51 1
52 1 /* initialize VIC*/
53 1 VICIntEnClr = 0xffffffff;
54 1 VICVectAddr = 0;
55 1 VICIntSelect = 0;
56 1
57 1 /* set all the vector and vector control register to 0 */
58 1 for ( i = 0; i < VIC_SIZE; i++ )
ARM COMPILER V2.53, irq 24/10/06 20:29:56 PAGE 2
59 1 {
60 2 vect_addr = (DWORD *)(VIC_BASE_ADDR + VECT_ADDR_INDEX + i*4);
61 2 vect_cntl = (DWORD *)(VIC_BASE_ADDR + VECT_CNTL_INDEX + i*4);
62 2 *vect_addr = 0;
63 2 *vect_cntl = 0;
64 2 }
65 1
66 1 /* Install the default VIC handler here */
67 1 VICDefVectAddr = (DWORD)DefaultVICHandler;
68 1 return;
69 1 }
70
71 /******************************************************************************
72 ** Function name: install_irq
73 **
74 ** Descriptions: Install interrupt handler
75 ** The max VIC size is 16, but, there are 32 interrupt
76 ** request inputs. Not all of them can be installed into
77 ** VIC table at the same time.
78 ** The order of the interrupt request installation is
79 ** first come first serve.
80 ** parameters: Interrupt number and interrupt handler address
81 ** Returned value: true or false, when the table is full, return false
82 **
83 ******************************************************************************/
84 DWORD install_irq( DWORD IntNumber, void *HandlerAddr )
85 {
86 1 DWORD i;
87 1 DWORD *vect_addr;
88 1 DWORD *vect_cntl;
89 1
90 1 VICIntEnClr = 1 << IntNumber; /* Disable Interrupt */
91 1
92 1 for ( i = 0; i < VIC_SIZE; i++ )
93 1 {
94 2 /* find first un-assigned VIC address for the handler */
95 2
96 2 vect_addr = (DWORD *)(VIC_BASE_ADDR + VECT_ADDR_INDEX + i*4);
97 2 vect_cntl = (DWORD *)(VIC_BASE_ADDR + VECT_CNTL_INDEX + i*4);
98 2 if ( *vect_addr == (DWORD)NULL )
99 2 {
100 3 *vect_addr = (DWORD)HandlerAddr; /* set interrupt vector */
101 3 *vect_cntl = (DWORD)(IRQ_SLOT_EN | IntNumber);
102 3 break;
103 3 }
104 2 }
105 1 if ( i == VIC_SIZE )
106 1 {
107 2 return( FALSE ); /* fatal error, can't find empty vector slot */
108 2 }
109 1 VICIntEnable = 1 << IntNumber; /* Enable Interrupt */
110 1 return( TRUE );
111 1 }
112
113 /******************************************************************************
114 ** Function name: uninstall_irq
115 **
116 ** Descriptions: Uninstall interrupt handler
117 ** Find the interrupt handler installed in the VIC
118 ** based on the interrupt number, set the location
119 ** back to NULL to uninstall it.
120 ** parameters: Interrupt number
121 ** Returned value: true or false, when the interrupt number is not found,
122 ** return false
123 **
124 ******************************************************************************/
ARM COMPILER V2.53, irq 24/10/06 20:29:56 PAGE 3
125 DWORD uninstall_irq( DWORD IntNumber )
126 {
127 1 DWORD i;
128 1 DWORD *vect_addr;
129 1 DWORD *vect_cntl;
130 1
131 1 VICIntEnClr = 1 << IntNumber; /* Disable Interrupt */
132 1
133 1 for ( i = 0; i < VIC_SIZE; i++ )
134 1 {
135 2 /* find first un-assigned VIC address for the handler */
136 2 vect_addr = (DWORD *)(VIC_BASE_ADDR + VECT_ADDR_INDEX + i*4);
137 2 vect_cntl = (DWORD *)(VIC_BASE_ADDR + VECT_CNTL_INDEX + i*4);
138 2 if ( (*vect_cntl & ~IRQ_SLOT_EN ) == IntNumber )
139 2 {
140 3 *vect_addr = (DWORD)NULL; /* clear the VIC entry in the VIC table */
141 3 *vect_cntl &= ~IRQ_SLOT_EN; /* disable SLOT_EN bit */
142 3 break;
143 3 }
144 2 }
145 1 if ( i == VIC_SIZE )
146 1 {
147 2 return( FALSE ); /* fatal error, can't find interrupt number
148 2 in vector slot */
149 2 }
150 1 VICIntEnable = 1 << IntNumber; /* Enable Interrupt */
151 1 return( TRUE );
152 1 }
153
154 /******************************************************************************
155 ** End Of File
156 ******************************************************************************/
ARM COMPILER V2.53, irq 24/10/06 20:29:56 PAGE 4
ASSEMBLY LISTING OF GENERATED OBJECT CODE
*** PUBLICS:
PUBLIC init_VIC?T
PUBLIC install_irq?T
PUBLIC uninstall_irq?T
PUBLIC DefaultVICHandler?A
*** CODE SEGMENT '?PR?DefaultVICHandler?A?irq':
28: void DefaultVICHandler (void) __irq
00000000 E92D0003 STMDB R13!,{R0-R1}
34: VICVectAddr = 0; /* Acknowledge Interrupt */
00000004 E3A01000 MOV R1,#0x0
00000008 E5100000 LDR R0,=0xFFFFF030
0000000C E5801000 STR R1,[R0,#0x0]
35: while ( 1 );
00000010 L_1:
00000010 EAFFFFFE B L_1 ; Targ=0x10
36: }
00000014 E8BD0003 LDMIA R13!,{R0-R1}
00000018 E25EF004 SUBS R15,R14,#0x0004
0000001C ENDP ; 'DefaultVICHandler?A'
*** CODE SEGMENT '?PR?init_VIC?T?irq':
47: void init_VIC(void)
00000000 B410 PUSH {R4}
48: {
00000002 ; SCOPE-START
49: DWORD i = 0;
00000002 2100 MOV R1,#0x0
00000004 1C08 MOV R0,R1 ; i
00000006 ---- Variable 'i' assigned to Register 'R0' ----
53: VICIntEnClr = 0xffffffff;
00000006 4800 LDR R2,=0xFFFFFFFF
00000008 4800 LDR R0,=0xFFFFF014
0000000A 6002 STR R2,[R0,#0x0]
54: VICVectAddr = 0;
0000000C 4800 LDR R0,=0xFFFFF030
0000000E 6001 STR R1,[R0,#0x0]
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