Kev Mann / mbed-dev-OS5_10_4

RTC auf true

rtos/TARGET_CORTEX/mbed_boot.c@2:7aab896b1a3b, 2019-03-13 (annotated)

Committer:
kevman
Date:
Wed Mar 13 11:03:24 2019 +0000
Revision:
2:7aab896b1a3b
Parent:
0:38ceb79fef03 
2019-03-13

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kevman 0:38ceb79fef03 1 /* mbed Microcontroller Library
kevman 0:38ceb79fef03 2 * Copyright (c) 2006-2016 ARM Limited
kevman 0:38ceb79fef03 3 *
kevman 0:38ceb79fef03 4 * Licensed under the Apache License, Version 2.0 (the "License");
kevman 0:38ceb79fef03 5 * you may not use this file except in compliance with the License.
kevman 0:38ceb79fef03 6 * You may obtain a copy of the License at
kevman 0:38ceb79fef03 7 *
kevman 0:38ceb79fef03 8 * http://www.apache.org/licenses/LICENSE-2.0
kevman 0:38ceb79fef03 9 *
kevman 0:38ceb79fef03 10 * Unless required by applicable law or agreed to in writing, software
kevman 0:38ceb79fef03 11 * distributed under the License is distributed on an "AS IS" BASIS,
kevman 0:38ceb79fef03 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kevman 0:38ceb79fef03 13 * See the License for the specific language governing permissions and
kevman 0:38ceb79fef03 14 * limitations under the License.
kevman 0:38ceb79fef03 15 */
kevman 0:38ceb79fef03 16
kevman 0:38ceb79fef03 17 /* mbed OS boot sequence
kevman 0:38ceb79fef03 18 *
kevman 0:38ceb79fef03 19 * Most of mbed supported targets use default ARM Cortex M boot approach, where the core starts executing reset vector
kevman 0:38ceb79fef03 20 * after power up. Reset ISR is defined for each target by the vendor (basing on CMSIS template). Reset vector is
kevman 0:38ceb79fef03 21 * responsible for low level platform init and then calling in libc (__main). Depending on compiler and version of C
kevman 0:38ceb79fef03 22 * library, predefined function will be called which is implemented by mbed OS.
kevman 0:38ceb79fef03 23 *
kevman 0:38ceb79fef03 24 * There's number of functions, vendor and users can provide to setup the platform and/or inject a code to be executed
kevman 0:38ceb79fef03 25 * before main():
kevman 0:38ceb79fef03 26 * * Reset vector and SystemInit: Reset vector should do low level core and board initialization.
kevman 0:38ceb79fef03 27 * * mbed_sdk_init: Higher level board init and making sure the board is ready for the mbed OS.
kevman 0:38ceb79fef03 28 * * mbed_main: User's code to be executed before main().
kevman 0:38ceb79fef03 29 * * main: Standard application code.
kevman 0:38ceb79fef03 30 *
kevman 0:38ceb79fef03 31 * Other notes:
kevman 0:38ceb79fef03 32 *
kevman 0:38ceb79fef03 33 * * In addition to the above, libc will use functions defined in mbed_boot.c: __rtos_malloc_lock/unlock,
kevman 0:38ceb79fef03 34 * __rtos_env_lock/unlock.
kevman 0:38ceb79fef03 35 *
kevman 0:38ceb79fef03 36 * * First step after the execution is passed to mbed, software_init_hook for GCC and __rt_entry for ARMC is to
kevman 0:38ceb79fef03 37 * initialize heap.
kevman 0:38ceb79fef03 38 *
kevman 0:38ceb79fef03 39 * Memory layout notes:
kevman 0:38ceb79fef03 40 * ====================
kevman 0:38ceb79fef03 41 *
kevman 0:38ceb79fef03 42 * IAR Default Memory layout notes:
kevman 0:38ceb79fef03 43 * -Heap defined by "HEAP" region in .icf file
kevman 0:38ceb79fef03 44 * -Interrupt stack defined by "CSTACK" region in .icf file
kevman 0:38ceb79fef03 45 * -Value INITIAL_SP is ignored
kevman 0:38ceb79fef03 46 *
kevman 0:38ceb79fef03 47 * IAR Custom Memory layout notes:
kevman 0:38ceb79fef03 48 * -There is no custom layout available for IAR - everything must be defined in
kevman 0:38ceb79fef03 49 * the .icf file and use the default layout
kevman 0:38ceb79fef03 50 *
kevman 0:38ceb79fef03 51 *
kevman 0:38ceb79fef03 52 * GCC Default Memory layout notes:
kevman 0:38ceb79fef03 53 * -Block of memory from symbol __end__ to define INITIAL_SP used to setup interrupt
kevman 0:38ceb79fef03 54 * stack and heap in the function set_stack_heap()
kevman 0:38ceb79fef03 55 * -ISR_STACK_SIZE can be overridden to be larger or smaller
kevman 0:38ceb79fef03 56 *
kevman 0:38ceb79fef03 57 * GCC Custom Memory layout notes:
kevman 0:38ceb79fef03 58 * -Heap can be explicitly placed by defining both HEAP_START and HEAP_SIZE
kevman 0:38ceb79fef03 59 * -Interrupt stack can be explicitly placed by defining both ISR_STACK_START and ISR_STACK_SIZE
kevman 0:38ceb79fef03 60 *
kevman 0:38ceb79fef03 61 *
kevman 0:38ceb79fef03 62 * ARM Memory layout
kevman 0:38ceb79fef03 63 * -Block of memory from end of region "RW_IRAM1" to define INITIAL_SP used to setup interrupt
kevman 0:38ceb79fef03 64 * stack and heap in the function set_stack_heap()
kevman 0:38ceb79fef03 65 * -ISR_STACK_SIZE can be overridden to be larger or smaller
kevman 0:38ceb79fef03 66 *
kevman 0:38ceb79fef03 67 * ARM Custom Memory layout notes:
kevman 0:38ceb79fef03 68 * -Heap can be explicitly placed by defining both HEAP_START and HEAP_SIZE
kevman 0:38ceb79fef03 69 * -Interrupt stack can be explicitly placed by defining both ISR_STACK_START and ISR_STACK_SIZE
kevman 0:38ceb79fef03 70 *
kevman 0:38ceb79fef03 71 */
kevman 0:38ceb79fef03 72
kevman 0:38ceb79fef03 73 #include <stdlib.h>
kevman 0:38ceb79fef03 74
kevman 0:38ceb79fef03 75 #include "cmsis.h"
kevman 0:38ceb79fef03 76 #include "mbed_toolchain.h"
kevman 0:38ceb79fef03 77 #include "mbed_boot.h"
kevman 0:38ceb79fef03 78
kevman 0:38ceb79fef03 79 int main(void);
kevman 0:38ceb79fef03 80 static void mbed_cpy_nvic(void);
kevman 0:38ceb79fef03 81
kevman 0:38ceb79fef03 82 /* Stack limits */
kevman 0:38ceb79fef03 83 unsigned char *mbed_stack_isr_start = 0;
kevman 0:38ceb79fef03 84 uint32_t mbed_stack_isr_size = 0;
kevman 0:38ceb79fef03 85
kevman 0:38ceb79fef03 86 void mbed_init(void)
kevman 0:38ceb79fef03 87 {
kevman 0:38ceb79fef03 88 mbed_cpy_nvic();
kevman 0:38ceb79fef03 89 mbed_sdk_init();
kevman 0:38ceb79fef03 90 mbed_rtos_init();
kevman 0:38ceb79fef03 91 }
kevman 0:38ceb79fef03 92
kevman 0:38ceb79fef03 93 void mbed_start(void)
kevman 0:38ceb79fef03 94 {
kevman 0:38ceb79fef03 95 mbed_toolchain_init();
kevman 0:38ceb79fef03 96 mbed_main();
kevman 0:38ceb79fef03 97 main();
kevman 0:38ceb79fef03 98 }
kevman 0:38ceb79fef03 99
kevman 0:38ceb79fef03 100 MBED_WEAK void mbed_sdk_init(void)
kevman 0:38ceb79fef03 101 {
kevman 0:38ceb79fef03 102 // Nothing by default
kevman 0:38ceb79fef03 103 }
kevman 0:38ceb79fef03 104
kevman 0:38ceb79fef03 105 MBED_WEAK void software_init_hook_rtos()
kevman 0:38ceb79fef03 106 {
kevman 0:38ceb79fef03 107 // Nothing by default
kevman 0:38ceb79fef03 108 }
kevman 0:38ceb79fef03 109
kevman 0:38ceb79fef03 110 MBED_WEAK void mbed_main(void)
kevman 0:38ceb79fef03 111 {
kevman 0:38ceb79fef03 112 // Nothing by default
kevman 0:38ceb79fef03 113 }
kevman 0:38ceb79fef03 114
kevman 0:38ceb79fef03 115 static void mbed_cpy_nvic(void)
kevman 0:38ceb79fef03 116 {
kevman 0:38ceb79fef03 117 /* If vector address in RAM is defined, copy and switch to dynamic vectors. Exceptions for M0 which doesn't have
kevman 0:38ceb79fef03 118 VTOR register and for A9 for which CMSIS doesn't define NVIC_SetVector; in both cases target code is
kevman 0:38ceb79fef03 119 responsible for correctly handling the vectors.
kevman 0:38ceb79fef03 120 */
kevman 0:38ceb79fef03 121 #if !defined(__CORTEX_M0) && !defined(__CORTEX_A9)
kevman 0:38ceb79fef03 122 #ifdef NVIC_RAM_VECTOR_ADDRESS
kevman 0:38ceb79fef03 123 uint32_t *old_vectors = (uint32_t *)SCB->VTOR;
kevman 0:38ceb79fef03 124 uint32_t *vectors = (uint32_t*)NVIC_RAM_VECTOR_ADDRESS;
kevman 0:38ceb79fef03 125 for (int i = 0; i < NVIC_NUM_VECTORS; i++) {
kevman 0:38ceb79fef03 126 vectors[i] = old_vectors[i];
kevman 0:38ceb79fef03 127 }
kevman 0:38ceb79fef03 128 SCB->VTOR = (uint32_t)NVIC_RAM_VECTOR_ADDRESS;
kevman 0:38ceb79fef03 129 #endif /* NVIC_RAM_VECTOR_ADDRESS */
kevman 0:38ceb79fef03 130 #endif /* !defined(__CORTEX_M0) && !defined(__CORTEX_A9) */
kevman 0:38ceb79fef03 131 }