About VN.2

VN.2 · 2023-03-09

I'm attempting to optimize the amount of instructions/time it takes to move data from CPU to GPIO. When doing ODR = X, I lose about 40ns, closer to 80 because I need to use 2 ODR writes to different ports and in general ODR output seems to sit at abo...

VN.2 · 2022-10-27

I noticed some issues with latency in my project and I do not know exactly where the latency is coming from. I'm also driving the chip hard, it's overclocked to 540Mhz. In the below blog post I came across a blurb status that there is some debugger s...

VN.2 · 2022-09-27

I would like to remove the CM7 from having to be involved in this toggle. Should it be possible to toggle the direction through DMA? Is there anything special that needs to happen for this to work? // Switch to output. GPIOA->MODER = ...

VN.2 · 2022-09-24

After attempting to code it up myself and after it didn't work attempted to verify using CubeMX.I have 2 questions:CubeMX does not give me the ability to select Alternate Function 2 on GPIOB pin 1 as input for TIM3_CH4, while Datasheet - STM32H750VB ...

VN.2 · 2022-09-02

I'm a bit confused what ISR==0 means in a DMA IRQ handler. I can skip it but wonder if something is configured incorrectly. Is "ISR==0" an expected and valid case or do I need to delve into settings? No error code is set, I am funneling all BDMA ISRs...

VN.2 · 2023-03-10

I am aware of RP2040, but my application uses the FMC with 512Mb of SDRAM, which is not possible with the RP2040. I need to know about whether I can invoke a DMARequestsGenerator from SW on the STM32H750.

VN.2 · 2022-10-19

Answering my own question. Did an experiment. It is no issue, at all, to let BDMA write to GPIOx->MODER, as Memory to Pheriperal. By Chaining that DMA through an event a bidirectional interface can be created. The MODER write adds about 30ns to the a...

VN.2 · 2022-09-28

This was all I needed actually. (AScha.3 first comment)Most important things I missed was the Clock Source needing to be set to "Internal Clock" and PB1 being initialized to TIM3_CH4.Additionally, I goofed on the PB1 pin setup internally, and set it ...

VN.2 · 2022-09-28

@AScha.3 >> just: what you want to do with this ?I'm attempting to time the polarity changes on PinB_1 which are encoded bits based on pulse width. I want to offload the timing from the CM7, with a maximum transfer size being 10 bytes. At maximum: 1...

VN.2 · 2022-09-27

@AScha.3 It would help to know, whether I should be able to do capture of the timer through DMA on TIM3_CH4 input. Without any more CPU interaction.

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DMA request generation from Software STM32H750

STM32H750 profiling tools.

Toggle GPIO port input/output direction (MODER) through DMA? STM32H750

Configuring Timer3 for capture Compare input with DMA on CH4. STM32H750

BDMA_ChannelX_IRQHandler being entered with ISR == 0. (H750)

Re: DMA request generation from Software STM32H750

Re: Toggle GPIO port input/output direction (MODER) through DMA? STM32H750

Re: Configuring Timer3 for capture Compare input with DMA on CH4. STM32H750

Re: Configuring Timer3 for capture Compare input with DMA on CH4. STM32H750

Re: Configuring Timer3 for capture Compare input with DMA on CH4. STM32H750