About SHers

SHers · 2022-06-09

I'm debugging a legacy application on an STM32F407 that uses the std peripheral libraries and LwIP 1.4.1, and except on rare occasions, hardware IPv4 checksums don't work; they all get sent out as zeroes. When I disable hardware checksums in lwipopts...

SHers · 2021-09-02

I've purchased an LRWAN2 kit for an upcoming ST workshop, and I wanted to make sure I can set the RF band, etc. when the time comes.I've followed the setup instructions in UM2587 rev 2, the "Getting Started" guide, and I get the following power and s...

SHers · 2019-05-28

I'm trying to use the IDE to generate a CubeMX project for the 769I-DISCO that uses the LCD and touchscreen; I've settled on the STemWin graphics library to avoid depending on the external TouchGFX tools. I've built numerous projects using the standa...

SHers · 2018-12-13

I've written a flash-based bootloader for the STM32F4 using the latest STM32CubeMX tool and its HAL libraries. I've avoided all the usual pitfalls (it's not my first bootloader), and my code works reliably. I'm not erasing my bootloader segment, writ...

SHers · 2023-07-20

FWIW, I have run into the same issue with the latest CubeMX / IDE, and I have found a solution. I tried using both CMSIS V1 and CMSIS V2 options for FreeRTOS. With V1, I get the same fault described here; with V2, I get a semaphore failure in the LwI...

SHers · 2022-08-04

I am also looking for PTP support for an STM32F4. I've examined the Github project; unfortunately for me, it has neither copyright notices nor a license statement, so I can at most use it as a guide to develop my own independent implementation. This ...

SHers · 2022-06-13

Thanks for the additional information. It's ironic that the LwIP thread you linked to is exactly the information I was trying to ferret out by the use of search-engine-foo (but never quite reached). There's a lot of information out there, often the h...

SHers · 2022-06-10

Aaaand, solved!This one is a combination of legacy code doing unexpected things, and hardware checksum calculation having unexpected requirements.1) The LwIP 1.4.1 stack has an entirely SEPARATE set of #defines in opt.h that are supposed to be contro...

SHers · 2022-06-10

Thanks for the suggestions.Yes, that section of the RM would be dog-eared by now if it were a hardcopy. I've read it several times, searched the RM for every instance of "offload" to be sure I didn't miss anything, and done the same with the errata s...

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Hardware IPv4 checksum on an STM32F407 is not working, though all the proper settings are set. (Works on rare occasions, oddly)

P-NUCLEO-LRWAN2 won't communicate with PC via USB

Creating project for STM32F769I-DISCO omits necessary STemWin Library File

Why would FLASH_FLAG_PGPERR and FLASH_FLAG_PGSERR be set after a successful flash write, and at power-up before any flash write operations?

Re: LWIP and FreeRTOS using Nucleo-144 F429zi

Re: STM32F427 PTP Implementation

Re: Hardware IPv4 checksum on an STM32F407 is not working, though all the proper settings are set. (Works on rare occasions, oddly)

Re: Hardware IPv4 checksum on an STM32F407 is not working, though all the proper settings are set. (Works on rare occasions, oddly)

Re: Hardware IPv4 checksum on an STM32F407 is not working, though all the proper settings are set. (Works on rare occasions, oddly)