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// Copyright 2020 The Pigweed Authors
// Licensed under the Apache License, Version 2.0 (the "License"); you may not
// use this file except in compliance with the License. You may obtain a copy of
// the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
// License for the specific language governing permissions and limitations under
// the License.
#include <stdbool.h>
#include "pw_boot/boot.h"
#include "pw_boot_cortex_m/boot.h"
// Default handler to insert into the ARMv7-M vector table (below).
// This function exists for convenience. If a device isn't doing what you
// expect, it might have hit a fault and ended up here.
static void DefaultFaultHandler(void) {
while (true) {
// Wait for debugger to attach.
// This is the device's interrupt vector table. It's not referenced in any
// code because the platform (STM32F4xx) expects this table to be present at the
// beginning of flash. The exact address is specified in the pw_boot_cortex_m
// configuration as part of the target config.
// For more information, see ARMv7-M Architecture Reference Manual DDI 0403E.b
// section B1.5.3.
// This typedef is for convenience when building the vector table. With the
// exception of SP_main (0th entry in the vector table), all the entries of the
// vector table are function pointers.
typedef void (*InterruptHandler)(void);
const InterruptHandler vector_table[] = {
// The starting location of the stack pointer.
// This address is NOT an interrupt handler/function pointer, it is simply
// the address that the main stack pointer should be initialized to. The
// value is reinterpret casted because it needs to be in the vector table.
[0] = (InterruptHandler)(&pw_boot_stack_high_addr),
// Reset handler, dictates how to handle reset interrupt. This is the
// address that the Program Counter (PC) is initialized to at boot.
[1] = pw_boot_Entry,
// NMI handler.
[2] = DefaultFaultHandler,
// HardFault handler.
[3] = DefaultFaultHandler,