Joris Aerts / mbed-src

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targets/cmsis/TARGET_NORDIC/TARGET_MCU_NRF51822/cmsis_nvic.c@637:ed69428d4850, 2015-12-22 (annotated)

Committer:
jaerts
Date:
Tue Dec 22 13:22:16 2015 +0000
Revision:
637:ed69428d4850
Parent:
358:9d7ef901f004 
Add very shady LPC1768 CAN Filter implementation

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbed_official 358:9d7ef901f004 1 /* mbed Microcontroller Library
mbed_official 358:9d7ef901f004 2 * CMSIS-style functionality to support dynamic vectors
mbed_official 358:9d7ef901f004 3 *******************************************************************************
mbed_official 358:9d7ef901f004 4 * Copyright (c) 2011 ARM Limited. All rights reserved.
mbed_official 358:9d7ef901f004 5 * All rights reserved.
mbed_official 358:9d7ef901f004 6 *
mbed_official 358:9d7ef901f004 7 * Redistribution and use in source and binary forms, with or without
mbed_official 358:9d7ef901f004 8 * modification, are permitted provided that the following conditions are met:
mbed_official 85:e1a8e879a6a9 9 *
mbed_official 358:9d7ef901f004 10 * 1. Redistributions of source code must retain the above copyright notice,
mbed_official 358:9d7ef901f004 11 * this list of conditions and the following disclaimer.
mbed_official 358:9d7ef901f004 12 * 2. Redistributions in binary form must reproduce the above copyright notice,
mbed_official 358:9d7ef901f004 13 * this list of conditions and the following disclaimer in the documentation
mbed_official 358:9d7ef901f004 14 * and/or other materials provided with the distribution.
mbed_official 358:9d7ef901f004 15 * 3. Neither the name of ARM Limited nor the names of its contributors
mbed_official 358:9d7ef901f004 16 * may be used to endorse or promote products derived from this software
mbed_official 358:9d7ef901f004 17 * without specific prior written permission.
mbed_official 358:9d7ef901f004 18 *
mbed_official 358:9d7ef901f004 19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
mbed_official 358:9d7ef901f004 20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
mbed_official 358:9d7ef901f004 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
mbed_official 358:9d7ef901f004 22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
mbed_official 358:9d7ef901f004 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
mbed_official 358:9d7ef901f004 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
mbed_official 358:9d7ef901f004 25 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
mbed_official 358:9d7ef901f004 26 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
mbed_official 358:9d7ef901f004 27 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
mbed_official 358:9d7ef901f004 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
mbed_official 358:9d7ef901f004 29 *******************************************************************************
mbed_official 358:9d7ef901f004 30 */
mbed_official 85:e1a8e879a6a9 31 #include "cmsis_nvic.h"
mbed_official 85:e1a8e879a6a9 32
mbed_official 85:e1a8e879a6a9 33 /* In the M0, there is no VTOR. In the LPC range such as the LPC11U,
mbed_official 85:e1a8e879a6a9 34 * whilst the vector table may only be something like 48 entries (192 bytes, 0xC0),
mbed_official 85:e1a8e879a6a9 35 * the SYSMEMREMAP register actually remaps the memory from 0x10000000-0x100001FF
mbed_official 85:e1a8e879a6a9 36 * to adress 0x0-0x1FF. In this case, RAM can be addressed at both 0x10000000 and 0x0
mbed_official 85:e1a8e879a6a9 37 *
mbed_official 85:e1a8e879a6a9 38 * If we just copy the vectors to RAM and switch the SYSMEMMAP, any accesses to FLASH
mbed_official 85:e1a8e879a6a9 39 * above the vector table before 0x200 will actually go to RAM. So we need to provide
mbed_official 85:e1a8e879a6a9 40 * a solution where the compiler gets the right results based on the memory map
mbed_official 85:e1a8e879a6a9 41 *
mbed_official 85:e1a8e879a6a9 42 * Option 1 - We allocate and copy 0x200 of RAM rather than just the table
mbed_official 85:e1a8e879a6a9 43 * - const data and instructions before 0x200 will be copied to and fetched/exec from RAM
mbed_official 85:e1a8e879a6a9 44 * - RAM overhead: 0x200 - 0xC0 = 320 bytes, FLASH overhead: 0
mbed_official 85:e1a8e879a6a9 45 *
mbed_official 85:e1a8e879a6a9 46 * Option 2 - We pad the flash to 0x200 to ensure the compiler doesn't allocate anything there
mbed_official 85:e1a8e879a6a9 47 * - No flash accesses will go to ram, as there will be nothing there
mbed_official 85:e1a8e879a6a9 48 * - RAM only needs to be allocated for the vectors, as all other ram addresses are normal
mbed_official 85:e1a8e879a6a9 49 * - RAM overhead: 0, FLASH overhead: 320 bytes
mbed_official 85:e1a8e879a6a9 50 *
mbed_official 85:e1a8e879a6a9 51 * Option 2 is the one to go for, as RAM is the most valuable resource
mbed_official 85:e1a8e879a6a9 52 */
mbed_official 85:e1a8e879a6a9 53
mbed_official 85:e1a8e879a6a9 54
mbed_official 85:e1a8e879a6a9 55 #define NVIC_RAM_VECTOR_ADDRESS (0x10000000) // Location of vectors in RAM
mbed_official 85:e1a8e879a6a9 56 #define NVIC_FLASH_VECTOR_ADDRESS (0x0) // Initial vector position in flash
mbed_official 85:e1a8e879a6a9 57 /*
mbed_official 85:e1a8e879a6a9 58 void NVIC_SetVector(IRQn_Type IRQn, uint32_t vector) {
mbed_official 85:e1a8e879a6a9 59 uint32_t *vectors = (uint32_t*)SCB->VTOR;
mbed_official 85:e1a8e879a6a9 60 uint32_t i;
mbed_official 85:e1a8e879a6a9 61
mbed_official 85:e1a8e879a6a9 62 // Copy and switch to dynamic vectors if the first time called
mbed_official 85:e1a8e879a6a9 63 if (SCB->VTOR == NVIC_FLASH_VECTOR_ADDRESS) {
mbed_official 85:e1a8e879a6a9 64 uint32_t *old_vectors = vectors;
mbed_official 85:e1a8e879a6a9 65 vectors = (uint32_t*)NVIC_RAM_VECTOR_ADDRESS;
mbed_official 85:e1a8e879a6a9 66 for (i=0; i<NVIC_NUM_VECTORS; i++) {
mbed_official 85:e1a8e879a6a9 67 vectors[i] = old_vectors[i];
mbed_official 85:e1a8e879a6a9 68 }
mbed_official 85:e1a8e879a6a9 69 SCB->VTOR = (uint32_t)NVIC_RAM_VECTOR_ADDRESS;
mbed_official 85:e1a8e879a6a9 70 }
mbed_official 85:e1a8e879a6a9 71 vectors[IRQn + 16] = vector;
mbed_official 85:e1a8e879a6a9 72 }
mbed_official 85:e1a8e879a6a9 73
mbed_official 85:e1a8e879a6a9 74 uint32_t NVIC_GetVector(IRQn_Type IRQn) {
mbed_official 85:e1a8e879a6a9 75 uint32_t *vectors = (uint32_t*)SCB->VTOR;
mbed_official 85:e1a8e879a6a9 76 return vectors[IRQn + 16];
mbed_official 85:e1a8e879a6a9 77 }*/
mbed_official 85:e1a8e879a6a9 78
mbed_official 85:e1a8e879a6a9 79 void NVIC_SetVector(IRQn_Type IRQn, uint32_t vector) {
mbed_official 104:a6a92e2e5a92 80 // int i;
mbed_official 85:e1a8e879a6a9 81 // Space for dynamic vectors, initialised to allocate in R/W
mbed_official 85:e1a8e879a6a9 82 static volatile uint32_t* vectors = (uint32_t*)NVIC_RAM_VECTOR_ADDRESS;
mbed_official 85:e1a8e879a6a9 83 /*
mbed_official 85:e1a8e879a6a9 84 // Copy and switch to dynamic vectors if first time called
mbed_official 85:e1a8e879a6a9 85 if((LPC_SYSCON->SYSMEMREMAP & 0x3) != 0x1) {
mbed_official 85:e1a8e879a6a9 86 uint32_t *old_vectors = (uint32_t *)0; // FLASH vectors are at 0x0
mbed_official 85:e1a8e879a6a9 87 for(i = 0; i < NVIC_NUM_VECTORS; i++) {
mbed_official 85:e1a8e879a6a9 88 vectors[i] = old_vectors[i];
mbed_official 85:e1a8e879a6a9 89 }
mbed_official 85:e1a8e879a6a9 90 LPC_SYSCON->SYSMEMREMAP = 0x1; // Remaps 0x0-0x1FF FLASH block to RAM block
mbed_official 85:e1a8e879a6a9 91 }*/
mbed_official 85:e1a8e879a6a9 92
mbed_official 85:e1a8e879a6a9 93 // Set the vector
mbed_official 85:e1a8e879a6a9 94 vectors[IRQn + 16] = vector;
mbed_official 85:e1a8e879a6a9 95 }
mbed_official 85:e1a8e879a6a9 96
mbed_official 85:e1a8e879a6a9 97 uint32_t NVIC_GetVector(IRQn_Type IRQn) {
mbed_official 85:e1a8e879a6a9 98 // We can always read vectors at 0x0, as the addresses are remapped
mbed_official 85:e1a8e879a6a9 99 uint32_t *vectors = (uint32_t*)0;
mbed_official 85:e1a8e879a6a9 100
mbed_official 85:e1a8e879a6a9 101 // Return the vector
mbed_official 85:e1a8e879a6a9 102 return vectors[IRQn + 16];
mbed_official 85:e1a8e879a6a9 103 }