When debugging STM32 programs, some flags are accidentally cleared by the debugging software-EEWORLD

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During debugging, the status of peripheral registers can be easily viewed using the register or memory display window of the debugging software.

Many friends have encountered this problem: they cannot see the changes of certain flag bits in the display window during single-step debugging. When these flag bits should be set, the window displays 0. Many people mistakenly think that this is a chip problem.

We know that many status register bits of STM32 peripherals can be cleared by reading certain registers (such as many flag bits in I2C_SR1 of I2C). During debugging, whenever the program stops at a set breakpoint or single-step stop, the debugging software will automatically read out the contents of all specified registers and memories and refresh the window display. This read operation of the debugging software just clears those flag bits, causing the phenomenon described above.

There are several simple ways to solve this problem:

1) Close the register or memory display window
2) Do not display these sensitive registers in the register or memory display window
3) Do not put the breakpoint before the operation of these sensitive register bits to ensure that these register bits are not accidentally operated by the debugging software.
4) Readers add it yourself~~~~~

Keywords：STM32 Reference address：When debugging STM32 programs, some flags are accidentally cleared by the debugging software

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