About PZhan.11

PZhan.11 · 2022-05-15

I am trying to encrypt part of my code and write back to internal flash. The MCU is STM32F407 and write to flash sector 3 (0x0800C000 - 0x0800FFFF). I customized the sct file to avoid other codes taking the place.The encrypted data takes 1Kbytes and ...

PZhan.11 · 2021-11-26

I am developing some products based on STM32F407/STM32F429. What I am trying to do is to protect my firmware that:simply dump the code from one chip's flash (to hex file) will not work in another chipmoderate reverse engineering should not be that ea...

PZhan.11 · 2021-10-09

I am using STM32F407ZGT6 and configured the TIM1_CH1 to trigger DMA2 to transmit data through GPIO. Since the protocol is using both raising and failing edges, I need to control both data pins and the clock pin. So the TIM1 is just generating PWM sig...

PZhan.11 · 2021-09-02

Hi, anybody,I am using STM32F407ZG/STM32F429IG to build two similar control board. The main function issome host send amount of data, about 1M bytes (STM32F407 with FSMC/SRAM) or 32M bytes (STM32F429 with FMC/SDRAM)to STM32 and stored in memory. Then...

PZhan.11 · 2021-08-22

Hi everyone, I am using STM32F429IGTx with ETH/FMC and many other peripherals to construct a control board. There is a special interface that I need to use TIM1/DMA2 driven GPIOs for communicating with another board that need 12 pins. Since FMC and ...

PZhan.11 · 2021-11-27

Yes, that kind of crack is ignored. We will try another method like minimizing the cost.

PZhan.11 · 2021-11-26

Actually, in a previous version, I use some kind of fingerprint (not EC-like) to verify the firmware. But I think the single point which mark it valid or not would be easy to bypass. So I thought to encrypt some part of my code by the UID to prevent ...

PZhan.11 · 2021-11-26

Since I found [this](https://www.usenix.org/system/files/conference/woot17/woot17-paper-obermaier.pdf). I don't carefully read it. but some blog referenced this paper that said one can bypass the protection of read-out.

PZhan.11 · 2021-10-10

But as you can see in the pseudo-code, the protocol transmits two bits on both rising and falling edges. That is why the PWM clock doesn't work. But one thing you mentioned that DMA requested too fast may be the problem.

PZhan.11 · 2021-10-09

The simple differences are:I am using TIM1_CH1 instead of TIM1_UP since I need the TRGO to trigger another TIM after the data is transmitted. That is also why I tried to use TIM+DMA driven GPIOI am using ODR instead of BSRR which should not have any ...

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