About alexandre23

alexandre23 · 2024-06-25

Hello, I am writing FDCAN driver filtering function for the open source ChibiOS RTOS, both for FdCanV2(H7) and FdCanV1(G4) For the H7 side, all went easy, and the driver works as intended. On the G4 side, FdCanV1 is a bit simpler (the ram buffer is ...

alexandre23 · 2024-04-04

Hello,I have a custom H743 board with Microchip USB3340 external PHY (REFCLK = 24MHz, dedicated external oscillator)In an code that use ChibiOS, my configuration should achieve HS mode, but ultimately, after handshake, it revert to FS mode (12Mbits/s...

alexandre23 · 2021-07-16

Hello,I am learning MDMA, and have been able to make it work in different scenarios, but I am now stuck.I want to use MDMA to chain DMA transactions without CPU intervention.What I want to do with mdma linked list is :° configure timer in output° use...

alexandre23 · 2021-02-18

Hello, I need to control a high frequency pwm with a low frequency pwm on a F407. I have used the gated method described in RM0090, it mostly works, but since the master pwm control the enable of the counting, the output of the slave timer can be le...

alexandre23 · 2020-07-24

Hello,I try to activate fifo + burst in dma transaction, without success (goal is a DSHOT driver* for drone)My setup (stm32f767):memory to timer TIM3 in pwm mode, writing several CCR registers in timer using DPAR+DBA+DBL (DBA set to access CCR regist...

alexandre23 · 2024-06-26

Thanks for the advice, PBCK : I found the problem, *** pointer arithmetic in the calculus of the filter ram address in my code. G4 FDCAN filter works as intended 

alexandre23 · 2024-04-10

Problem solved reading this thread on the forum : https://community.st.com/t5/stm32-mcus-embedded-software/stm32f2-f4-problems-with-various-ulpi-usb-phys/m-p/554263#M40349 this is also documented as an errata section on microchip 334x PHY manuel.TLDR...

alexandre23 · 2021-08-23

It seems that mdma linked list is made for that purpose, as you said in your first post. It's a little bit cumbersome to write all the mdma blocks, but it will work without cpu intervention. I use that solution in a project, but had to resolve a prob...

alexandre23 · 2021-08-23

For the record, I have yet not found a really good solution, but have found another work around. First workaround I used was to use software request mode, and trigger the request in an ISR driven by repeat buffer IRQ. that method add jitter to the ti...

alexandre23 · 2020-07-29

In fact dmaAllocate is a function API of the HAL (ChibiOS) that I use and basically what it does is :clearing DMA CR register then setting CR_RESET and FCR_RESET bit then associating NVIC vector.correct order of operation is :dmaAllocatedma register ...

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FDCAN filtering issue on G473

[STM32F7,H7] USB MSC+ULPI+HS : handshake in FS instead HS mode

mdma linked list unconditionnal trigger to next block

how to configure timers in master slave to have a low frequency pwm drives a high frequency pwm

How to activate FIFO and BURST on DMA Memory to Timer transaction (STM32F7)

Re: FDCan filtering issue on G473

Re: [STM32F7,H7] USB MSC+ULPI+HS : handshake in FS instead HS mode

Re: STM32H7 MDMA-MDA chaining

Re: mdma linked list unconditionnal trigger to next block

Re: How to activate FIFO and BURST on DMA Memory to Timer transaction (STM32F7)