1 /*
2 * Copyright (c) 2006-2018, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 * 2008-12-11 XuXinming first version
9 * 2013-03-29 aozima Modify the interrupt interface implementations.
10 */
11
12 #include <rtthread.h>
13 #include <rthw.h>
14 #include "LPC24xx.h"
15
16 #define MAX_HANDLERS 32
17
18 /* exception and interrupt handler table */
19 struct rt_irq_desc irq_desc[MAX_HANDLERS];
20
21 extern rt_uint32_t rt_interrupt_nest;
22
23 /* exception and interrupt handler table */
24 rt_uint32_t rt_interrupt_from_thread, rt_interrupt_to_thread;
25 rt_uint32_t rt_thread_switch_interrupt_flag;
26
27 /**
28 * @addtogroup LPC2478
29 */
30 /*@{*/
rt_hw_interrupt_handler(int vector,void * param)31 void rt_hw_interrupt_handler(int vector, void *param)
32 {
33 rt_kprintf("Unhandled interrupt %d occured!!!\n", vector);
34 }
35
rt_hw_interrupt_init(void)36 void rt_hw_interrupt_init(void)
37 {
38 register int i;
39
40 rt_uint32_t *vect_addr, *vect_cntl;
41
42 /* initialize VIC*/
43 VICIntEnClr = 0xffffffff;
44 VICVectAddr = 0;
45 VICIntSelect = 0;
46
47 /* init exceptions table */
48 rt_memset(irq_desc, 0x00, sizeof(irq_desc));
49 for(i=0; i < MAX_HANDLERS; i++)
50 {
51 irq_desc[i].handler = rt_hw_interrupt_handler;
52
53 vect_addr = (rt_uint32_t *)(VIC_BASE_ADDR + 0x100 + i*4);
54 vect_cntl = (rt_uint32_t *)(VIC_BASE_ADDR + 0x200 + i*4);
55 *vect_addr = (rt_uint32_t)&irq_desc[i];
56 *vect_cntl = 0xF;
57 }
58
59 /* init interrupt nest, and context in thread sp */
60 rt_interrupt_nest = 0;
61 rt_interrupt_from_thread = 0;
62 rt_interrupt_to_thread = 0;
63 rt_thread_switch_interrupt_flag = 0;
64 }
65
rt_hw_interrupt_mask(int vector)66 void rt_hw_interrupt_mask(int vector)
67 {
68 VICIntEnClr = (1 << vector);
69 }
70
rt_hw_interrupt_umask(int vector)71 void rt_hw_interrupt_umask(int vector)
72 {
73 VICIntEnable = (1 << vector);
74 }
75
76 /**
77 * This function will install a interrupt service routine to a interrupt.
78 * @param vector the interrupt number
79 * @param handler the interrupt service routine to be installed
80 * @param param the parameter for interrupt service routine
81 * @name unused.
82 *
83 * @return the old handler
84 */
rt_hw_interrupt_install(int vector,rt_isr_handler_t handler,void * param,const char * name)85 rt_isr_handler_t rt_hw_interrupt_install(int vector, rt_isr_handler_t handler,
86 void *param, const char *name)
87 {
88 rt_isr_handler_t old_handler = RT_NULL;
89
90 if(vector >= 0 && vector < MAX_HANDLERS)
91 {
92 old_handler = irq_desc[vector].handler;
93 if (handler != RT_NULL)
94 {
95 irq_desc[vector].handler = handler;
96 irq_desc[vector].param = param;
97 }
98 }
99
100 return old_handler;
101 }
102
103 /*@}*/
104