1 /* *****************************************************************************
2 * Copyright (C) 2016 Maxim Integrated Products, Inc., All Rights Reserved.
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining a
5 * copy of this software and associated documentation files (the "Software"),
6 * to deal in the Software without restriction, including without limitation
7 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8 * and/or sell copies of the Software, and to permit persons to whom the
9 * Software is furnished to do so, subject to the following conditions:
10 *
11 * The above copyright notice and this permission notice shall be included
12 * in all copies or substantial portions of the Software.
13 *
14 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
15 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
16 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
17 * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
18 * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20 * OTHER DEALINGS IN THE SOFTWARE.
21 *
22 * Except as contained in this notice, the name of Maxim Integrated
23 * Products, Inc. shall not be used except as stated in the Maxim Integrated
24 * Products, Inc. Branding Policy.
25 *
26 * The mere transfer of this software does not imply any licenses
27 * of trade secrets, proprietary technology, copyrights, patents,
28 * trademarks, maskwork rights, or any other form of intellectual
29 * property whatsoever. Maxim Integrated Products, Inc. retains all
30 * ownership rights.
31 *
32 * $Date: 2019-06-05 16:53:29 -0500 (Wed, 05 Jun 2019) $
33 * $Revision: 43696 $
34 *
35 **************************************************************************** */
36
37
38 #include "mxc_config.h"
39 #include <string.h>
40 #include "nvic_table.h"
41
42 #if !defined (NVIC_USER_IRQ_OFFSET)
43 #define NVIC_USER_IRQ_OFFSET 16 /**! Offset for device specific IRQs */
44 #endif
45
46 /* RAM vector_table needs to be aligned with the size of the vector table */
47 #if defined ( __ICCARM__ )
48 #pragma data_alignment = 512
49 #else
50 __attribute__((aligned(512)))
51 #endif
52 static void (*ramVectorTable[MXC_IRQ_COUNT])(void);
53
NVIC_SetRAM(void)54 void NVIC_SetRAM(void)
55 {
56 #if defined (__ICCARM__)
57 extern void (* const __isr_vector[])(void);
58 #else
59 /* should be defined in starup_<device>.S */
60 extern uint32_t __isr_vector[97];
61 #endif
62
63 memcpy(&ramVectorTable, &__isr_vector, sizeof(ramVectorTable));
64 SCB->VTOR = (uint32_t)&ramVectorTable;
65 }
66
NVIC_SetVector(IRQn_Type irqn,void (* irq_handler)(void))67 void NVIC_SetVector(IRQn_Type irqn, void(*irq_handler)(void))
68 {
69 int index = irqn + 16; /* offset for externals */
70
71 /* If not copied, do copy */
72 if (SCB->VTOR != (uint32_t)&ramVectorTable) {
73 NVIC_SetRAM();
74 }
75
76 ramVectorTable[index] = irq_handler;
77 NVIC_EnableIRQ(irqn);
78 }
79
NVIC_GetVector(IRQn_Type irqn)80 uint32_t NVIC_GetVector(IRQn_Type irqn)
81 {
82 uint32_t *vectors = (uint32_t *)SCB->VTOR;
83 return vectors[(int32_t)irqn + NVIC_USER_IRQ_OFFSET];
84 }
85