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STM32 how to locate the code segment that causes hard fault
2022-07-06 11:59:00 【Weiyuan escort agency】
produce hard fault Method :
Write to inaccessible memory address
uint32_t *addr = (uint32_t *)0x20100000; *addr = 0x12;
STM32 Positioning causes occurrence hard fault Code segment ~ technological process :
1、 Get into interrupt service function HardFault_Handler Before PC value (PC Value indicates where the assembly instruction is located flash Address )
2、 Generate disassembly file ( contains flash Address and corresponding assembly instructions , And compile the corresponding C Program ) perhaps MAP file
3、 In the disassembly file , adopt PC It's worth finding the corresponding C Program statement ; Or in MAP File by PC Value to find the corresponding calling function
Get into interrupt service function HardFault_Handler Before PC value
Method 1:
Use RT-Thread System , If appear hard fault, Will interrupt the service function HardFault_Handler Print the following message in :
from log Can be learned that Threads “ connect t “ The procedure in leads to hard fault, The program runs to PC: 0x08055F22 Jump to the interrupt service function HardFault_Handler
Method 2:
In interrupt service function HardFault_Handler Make a breakpoint at the beginning of
After the program runs here , Check the register first LR Value :
If LR by 0xXXXXXXX9, Before entering the interrupt SP The value of is MSP;
If LR by 0xXXXXXXXD, Before entering the interrupt SP The value of is PSP;
Below LR by 0xXXXXXXXD( The screenshot is not shown ), So look at the register PSP Value , by 0x2000FA30
adopt PSP Value , According to the register stack order , You can get PC value ( Because it is small end coding , So for 0x08055F6A)
Generate disassembly file
Method 1:
ELF File disassembly , Generate assembly file :
.arm-none-eabi-objdump.exe -l -S . tthread.elf > .aaa.c
Method 2:
start-up RT-Thread Studio Or other IDE debugging , open “ Disassembly ” View
Method 3:
see map file , There is some information similar to disassembly file , about RT-Thread function , It is rtthread.map
see rtthread.map It can be seen from the documents 0x08055F22 In function load_data_to_toServerBuf Inside
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