Umar Naeem / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by Umar Naeem

platform/mbed_application.c@165:2dd56e6daeec, 2017-05-23 (annotated)

Committer:
ranaumarnaeem
Date:
Tue May 23 12:54:50 2017 +0000
Revision:
165:2dd56e6daeec
Parent:
160:d5399cc887bb 
jhjg

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 160:d5399cc887bb 1 /* mbed Microcontroller Library
<> 160:d5399cc887bb 2 * Copyright (c) 2017-2017 ARM Limited
<> 160:d5399cc887bb 3 *
<> 160:d5399cc887bb 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 160:d5399cc887bb 5 * you may not use this file except in compliance with the License.
<> 160:d5399cc887bb 6 * You may obtain a copy of the License at
<> 160:d5399cc887bb 7 *
<> 160:d5399cc887bb 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 160:d5399cc887bb 9 *
<> 160:d5399cc887bb 10 * Unless required by applicable law or agreed to in writing, software
<> 160:d5399cc887bb 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 160:d5399cc887bb 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 160:d5399cc887bb 13 * See the License for the specific language governing permissions and
<> 160:d5399cc887bb 14 * limitations under the License.
<> 160:d5399cc887bb 15 */
<> 160:d5399cc887bb 16
<> 160:d5399cc887bb 17 #include <stdlib.h>
<> 160:d5399cc887bb 18 #include <stdarg.h>
<> 160:d5399cc887bb 19 #include "device.h"
<> 160:d5399cc887bb 20 #include "platform/mbed_application.h"
<> 160:d5399cc887bb 21
<> 160:d5399cc887bb 22 #if MBED_APPLICATION_SUPPORT
<> 160:d5399cc887bb 23
<> 160:d5399cc887bb 24 static void powerdown_nvic(void);
<> 160:d5399cc887bb 25 static void powerdown_scb(uint32_t vtor);
<> 160:d5399cc887bb 26 static void start_new_application(void *sp, void *pc);
<> 160:d5399cc887bb 27
<> 160:d5399cc887bb 28 void mbed_start_application(uintptr_t address)
<> 160:d5399cc887bb 29 {
<> 160:d5399cc887bb 30 void *sp;
<> 160:d5399cc887bb 31 void *pc;
<> 160:d5399cc887bb 32
<> 160:d5399cc887bb 33 // Interrupts are re-enabled in start_new_application
<> 160:d5399cc887bb 34 __disable_irq();
<> 160:d5399cc887bb 35
<> 160:d5399cc887bb 36 SysTick->CTRL = 0x00000000;
<> 160:d5399cc887bb 37 powerdown_nvic();
<> 160:d5399cc887bb 38 powerdown_scb(address);
<> 160:d5399cc887bb 39
<> 160:d5399cc887bb 40 sp = *((void**)address + 0);
<> 160:d5399cc887bb 41 pc = *((void**)address + 1);
<> 160:d5399cc887bb 42 start_new_application(sp, pc);
<> 160:d5399cc887bb 43 }
<> 160:d5399cc887bb 44
<> 160:d5399cc887bb 45 static void powerdown_nvic()
<> 160:d5399cc887bb 46 {
<> 160:d5399cc887bb 47 int isr_count;
<> 160:d5399cc887bb 48 int i;
<> 160:d5399cc887bb 49 int j;
<> 160:d5399cc887bb 50
<> 160:d5399cc887bb 51 isr_count = (SCnSCB->ICTR & SCnSCB_ICTR_INTLINESNUM_Msk) >> SCnSCB_ICTR_INTLINESNUM_Pos;
<> 160:d5399cc887bb 52 for (i = 0; i < isr_count; i++) {
<> 160:d5399cc887bb 53 NVIC->ICER[i] = 0xFFFFFFFF;
<> 160:d5399cc887bb 54 NVIC->ICPR[i] = 0xFFFFFFFF;
<> 160:d5399cc887bb 55 for (j = 0; j < 8; j++) {
<> 160:d5399cc887bb 56 NVIC->IP[i * 8 + j] = 0x00000000;
<> 160:d5399cc887bb 57 }
<> 160:d5399cc887bb 58 }
<> 160:d5399cc887bb 59 }
<> 160:d5399cc887bb 60
<> 160:d5399cc887bb 61 static void powerdown_scb(uint32_t vtor)
<> 160:d5399cc887bb 62 {
<> 160:d5399cc887bb 63 int i;
<> 160:d5399cc887bb 64
<> 160:d5399cc887bb 65 // SCB->CPUID - Read only CPU ID register
<> 160:d5399cc887bb 66 SCB->ICSR = SCB_ICSR_PENDSVCLR_Msk | SCB_ICSR_PENDSTCLR_Msk;
<> 160:d5399cc887bb 67 SCB->VTOR = vtor;
<> 160:d5399cc887bb 68 SCB->AIRCR = 0x05FA | 0x0000;
<> 160:d5399cc887bb 69 SCB->SCR = 0x00000000;
<> 160:d5399cc887bb 70 // SCB->CCR - Implementation defined value
<> 160:d5399cc887bb 71 for (i = 0; i < 12; i++) {
<> 160:d5399cc887bb 72 #if defined(__CORTEX_M7)
<> 160:d5399cc887bb 73 SCB->SHPR[i] = 0x00;
<> 160:d5399cc887bb 74 #else
<> 160:d5399cc887bb 75 SCB->SHP[i] = 0x00;
<> 160:d5399cc887bb 76 #endif
<> 160:d5399cc887bb 77 }
<> 160:d5399cc887bb 78 SCB->SHCSR = 0x00000000;
<> 160:d5399cc887bb 79 SCB->CFSR = 0xFFFFFFFF;
<> 160:d5399cc887bb 80 SCB->HFSR = SCB_HFSR_DEBUGEVT_Msk | SCB_HFSR_FORCED_Msk | SCB_HFSR_VECTTBL_Msk;
<> 160:d5399cc887bb 81 SCB->DFSR = SCB_DFSR_EXTERNAL_Msk | SCB_DFSR_VCATCH_Msk |
<> 160:d5399cc887bb 82 SCB_DFSR_DWTTRAP_Msk | SCB_DFSR_BKPT_Msk | SCB_DFSR_HALTED_Msk;
<> 160:d5399cc887bb 83 // SCB->MMFAR - Implementation defined value
<> 160:d5399cc887bb 84 // SCB->BFAR - Implementation defined value
<> 160:d5399cc887bb 85 // SCB->AFSR - Implementation defined value
<> 160:d5399cc887bb 86 // SCB->PFR - Read only processor feature register
<> 160:d5399cc887bb 87 // SCB->DFR - Read only debug feature registers
<> 160:d5399cc887bb 88 // SCB->ADR - Read only auxiliary feature registers
<> 160:d5399cc887bb 89 // SCB->MMFR - Read only memory model feature registers
<> 160:d5399cc887bb 90 // SCB->ISAR - Read only instruction set attribute registers
<> 160:d5399cc887bb 91 // SCB->CPACR - Implementation defined value
<> 160:d5399cc887bb 92 }
<> 160:d5399cc887bb 93
<> 160:d5399cc887bb 94 #if defined (__CC_ARM)
<> 160:d5399cc887bb 95
<> 160:d5399cc887bb 96 __asm static void start_new_application(void *sp, void *pc)
<> 160:d5399cc887bb 97 {
<> 160:d5399cc887bb 98 MOV R2, #0
<> 160:d5399cc887bb 99 MSR CONTROL, R2 // Switch to main stack
<> 160:d5399cc887bb 100 MOV SP, R0
<> 160:d5399cc887bb 101 MSR PRIMASK, R2 // Enable interrupts
<> 160:d5399cc887bb 102 BX R1
<> 160:d5399cc887bb 103 }
<> 160:d5399cc887bb 104
<> 160:d5399cc887bb 105 #elif defined (__GNUC__) || defined (__ICCARM__)
<> 160:d5399cc887bb 106
<> 160:d5399cc887bb 107 void start_new_application(void *sp, void *pc)
<> 160:d5399cc887bb 108 {
<> 160:d5399cc887bb 109 __asm volatile (
<> 160:d5399cc887bb 110 "mov r2, #0 \n"
<> 160:d5399cc887bb 111 "msr control, r2 \n" // Switch to main stack
<> 160:d5399cc887bb 112 "mov sp, %0 \n"
<> 160:d5399cc887bb 113 "msr primask, r2 \n" // Enable interrupts
<> 160:d5399cc887bb 114 "bx %1 \n"
<> 160:d5399cc887bb 115 :
<> 160:d5399cc887bb 116 : "l" (sp), "l" (pc)
<> 160:d5399cc887bb 117 : "r2", "cc", "memory"
<> 160:d5399cc887bb 118 );
<> 160:d5399cc887bb 119 }
<> 160:d5399cc887bb 120
<> 160:d5399cc887bb 121 #else
<> 160:d5399cc887bb 122
<> 160:d5399cc887bb 123 #error "Unsupported toolchain"
<> 160:d5399cc887bb 124
<> 160:d5399cc887bb 125 #endif
<> 160:d5399cc887bb 126
<> 160:d5399cc887bb 127 #endif /* MBED_APPLICATION_SUPPORT */