About DHase.1

DHase.1 · 2024-08-13

I am looking at strategies for updating flash over CAN for the F446 (STM32F446RET6). A small loader program resides in addresses 0-0x8000, and loads the addresses above 0x8000 while there is other CAN traffic running. (This has been done and works wi...

DHase.1 · 2024-07-19

I find that flashing a program using openocd, STLink (using a Nucleo F446, or L474), to our custom board frequently fails when there is CAN bus activity. What is causing this?Our board has BOOT0 tied to ground. The SWD is gnd, data, clock, and connec...

DHase.1 · 2023-07-02

I've been trying to get TIM2 PWM (or even OC) to produce an output. When looking at the registers, using openocd w telnet, I find that setting 0x40000000 (the CR1 register) with 0x81 also sets the 0x4000004C (the DMAR) register. The reverse is the sa...

DHase.1 · 2023-07-02

I'm having trouble getting TIM2 PWM to work so I've been studying the RM closely. The following conflict came to light.The RM shows TIMx_ARR and TIMx_CNT as 16b, but TIMx_CCR1,2,3,4 as 32b. The text (section 17.2) says TIM2 & TIM5 are 32b. Some debug...

DHase.1 · 2023-06-24

It is possible for a CR2032 coin-cell to be inserted backwards in the holder. Therefore the VBAT (on a STM32F446) input needs some protection for reversed polarity. What is the usual method of protection?The datasheet shows a -5 ma as the current lim...

DHase.1 · 2024-08-08

wacleawek.jan,Thanks for the thoughts. Here are a few responses; I think the last holds some promise--Processor: STM32L431RCT6SWD cable: length 16 cmTwo days ago my colleague's setup had a F3 for the STLink. The openocd connection was failing 100% at...

DHase.1 · 2024-08-07

[waclawek.jam. Thanks for the response. I thought I sent a response, but I don't see it. Here is a summary of it, plus an update.] These boards are on battery modules that are connected in series. The processors on these boards are isolated from the ...

DHase.1 · 2024-07-23

Today I downloaded in installed STM32CubeProgrammer. Not only does it not recognized the updated STLink, I can't get it uninstalled! Obviously, nothing has been done to fix the problem mentioned in the previous posts on this.

DHase.1 · 2023-07-02

The DMAR and CR1 registers are related via the DCR register. The default register settings do set a relationship between them such that loading either the DMAR or CR1 loads the other register, at least for the bit positions defined.I found the main p...

DHase.1 · 2022-10-06

DiBosco,It's been a long time since my first work with CAN with these processors and my memory is definitely faded on this, but I think you are correct in thinking that it won't send anything if there is nothing on the CAN bus. However, as I remember...

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STM32R446RE: can backup sram be used for the stack and variables in common?

STM32L431 Flashing fails if there is CAN bus activity

STM32F446 TIM2 CCR1 and DMAR registers appear tied together.

STM32F446 TIM2 16b versus 32b conflict in RM

What is the typical practice for protecting VBAT from a reversed coin-cell insertion?

Re: STM32L431 Flashing fails if there is CAN bus activity

Re: STM32L431 Flashing fails if there is CAN bus activity

Re: Uninstalling STM32CubeProgrammer on Linux

Re: STM32F446 TIM2 CCR1 and DMAR registers appear tied together.

Re: CAN Transmit questions