1 // Copyright 2021 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14
15 #include <stdbool.h>
16
17 #include "pw_boot/boot.h"
18 #include "pw_boot_cortex_m/boot.h"
19 #include "pw_preprocessor/compiler.h"
20 #include "stm32f4xx.h"
21
22 // Default handler to insert into the ARMv7-M vector table (below).
23 // This function exists for convenience. If a device isn't doing what you
24 // expect, it might have hit a fault and ended up here.
DefaultFaultHandler(void)25 static void DefaultFaultHandler(void) {
26 while (true) {
27 // Wait for debugger to attach.
28 }
29 }
30
31 // This is the device's interrupt vector table. It's not referenced in any
32 // code because the platform (STM32F4xx) expects this table to be present at the
33 // beginning of flash. The exact address is specified in the pw_boot_armv7m
34 // configuration as part of the target config.
35 //
36 // For more information, see ARMv7-M Architecture Reference Manual DDI 0403E.b
37 // section B1.5.3.
38
39 // This typedef is for convenience when building the vector table. With the
40 // exception of SP_main (0th entry in the vector table), all the entries of the
41 // vector table are function pointers.
42 typedef void (*InterruptHandler)(void);
43
44 // This is the timer interrupt handler implemented by the stm32cubef4 timer
45 // template.
46 void TIM6_DAC_IRQHandler(void);
47
48 // Interrupt handlers critical for OS operation.
49 void SVC_Handler(void);
50 void PendSV_Handler(void);
51 void SysTick_Handler(void);
52
53 PW_KEEP_IN_SECTION(".vector_table")
54 const InterruptHandler vector_table[] = {
55 // The starting location of the stack pointer.
56 // This address is NOT an interrupt handler/function pointer, it is simply
57 // the address that the main stack pointer should be initialized to. The
58 // value is reinterpret casted because it needs to be in the vector table.
59 [0] = (InterruptHandler)(&pw_boot_stack_high_addr),
60
61 // Reset handler, dictates how to handle reset interrupt. This is the
62 // address that the Program Counter (PC) is initialized to at boot.
63 [1] = pw_boot_Entry,
64
65 // NMI handler.
66 [2] = DefaultFaultHandler,
67 // HardFault handler.
68 [3] = DefaultFaultHandler,
69 // 4-6: Specialized fault handlers.
70 // 7-10: Reserved.
71 // SVCall handler.
72 [11] = SVC_Handler,
73 // DebugMon handler.
74 [12] = DefaultFaultHandler,
75 // 13: Reserved.
76 // PendSV handler.
77 [14] = PendSV_Handler,
78 // SysTick handler.
79 [15] = SysTick_Handler,
80 // stm32f4xx_hal sys-tick handler.
81 [TIM6_DAC_IRQn + 16] = TIM6_DAC_IRQHandler,
82 };
83