About rob-bits

rob-bits · 2024-08-30

I am developing a product which has an STM32H743 device. I am designing the firmware for the first PCBA prototype. The product receives 30fps video signal from an 720i analog video decoder through DCMI (every second bytes are stored, all lines, so 36...

rob-bits · 2024-09-04

You should follow up with this:https://community.st.com/t5/stm32-mcus-products/performance-characteristics-of-sdram-on-stm32f7508-disco-board/td-p/282763Basically you need cache management and MPU configuration to have best performance of the FMC int...

rob-bits · 2024-09-03

Seems like the issue is not related to the series resistor, but I replaced it to 10R. So here is the thing, I could manage to increase the parallel bus speed to 25MHz from 10Mhz, but it works only, if the audio capture is disabled. Without audio capt...

rob-bits · 2024-09-03

Seems like the SCB_CleanDCache_by_Addr() solved the cache issue with the DMA buffer. However I am a bit confused with the MPU and ram configuration.I am allocating a big array as: #define FRAME_Y_BYTE_SIZE (94800UL) __attribute__((section(".my_buf...

rob-bits · 2024-09-02

Thanks the input. Makes lot of sense. Indeed, I am not using OS and I have an always running while loop. I will try to add some sleep, it can fit there.For series resistor, first I used 27R and I changed to 120R that I read from other forums. Basical...

rob-bits · 2024-09-02

Thanks, I will examine this in more detail.Do you think the question #3 is related? ("f I increase the clock rate of the parallel bus, from 10MHz to 20MHz the timings are “crashed”")Based on my examination with scope and logic analizer, seems like th...

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STM32H743 memory bandwidth issues with DCMI, FMC, ADC, parallel bus, DMA1, DMA2 / DCACHE issue

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Re: STM32H743 memory bandwidth issues with DCMI, FMC, ADC, parallel bus, DMA1, DMA2 / DCACHE issue. What is the best practice for these peripher

Re: STM32H743 memory bandwidth issues with DCMI, FMC, ADC, parallel bus, DMA1, DMA2 / DCACHE issue. What is the best practice for these peripher

Re: STM32H743 memory bandwidth issues with DCMI, FMC, ADC, parallel bus, DMA1, DMA2 / DCACHE issue. What is the best practice for these peripher