About Kvang

Kvang · 2024-09-16

Hi I have configured Octospi1 to Read / Write from my FPGA in memory mapped mode.The interface works well, but i have a problem that the CPU is not reading from the memory and just use last cached value.The Variables are set volatile. both the pointe...

Kvang · 2024-09-11

Hi The MCU is a STM32H735I will use the UART3 port for combined debug output and command line interfaceSo I would like to use the FIFO, it quite useful when sending debug data.The Fifo is also useful for RX, if e.g. interrupt is blocked by other inte...

Kvang · 2024-09-10

Hi I'm trying to reuse some code that uses use std::fstream for file access.I have the FATFS working and can read and write files. like this:fr = f_open(&fil, path, FA_WRITE | FA_CREATE_ALWAYS);if (fr == FR_OK) {// Write text to the filefr = f_write(...

Kvang · 2024-08-13

Hi AllI have created a PCB where I want to use the OCTOSPI to communicate with a FPGA.I have difficulty finding accurate information on how the different memory types work. I already have a Hyperram running so I started there, that did also seem stra...

Kvang · 2024-07-17

HiI'm designing a PCB using the STM32H735 based on the eval kit STM32H735G-DK.On STM32H735G-DK there is both STlink connector and a TAG Connecter, but they are not wired the same way.I have the STlink working but was wondering what type of programmer...

Kvang · 2024-09-27

I have investigated some more.I have tried: Strongly ordered, Device, Shared non shared, and Normal.The only difference i see is when writing. in Normal it write 64bit boundaries filtered with DQSin Strongly ordered and Device it only write the data....

Kvang · 2024-09-26

Hi AllI came back from vacation and expected to proceed with above problem Being solved.But apparently after powering off the board, the code is no longer working??? The exacts same code was working a week ago.The solution has to related to above. ...

Kvang · 2024-09-17

I found the problem, in my playing round I accidently set MPU_INSTRUCTION_ACCESS_ENABLEWITH MPU_INSTRUCTION_ACCESS_DISABLE and the other setting from above it works and reads from the FPGA is fully volatile :)/* Configure the MPU attributes as WT for...

Kvang · 2024-09-17

I believe that I have tried almost everything now, not getting anywhere.My default settings was MPU NOT used and cache disabled and Speculation Disabled.Would Any MPU setting improve compared to this?What else can I do?Im a bit confused about this:MP...

Kvang · 2024-09-16

Hi Ddu PDid you ever find a better solution?Im fighting a similar problem, where I read from a FPGA using OctoSpi where the Data is Truly volatile. The CPU / MPU seems to ignore the volatile, and just stop reading from the OctoSpi after first read. I...

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Octospi1 Reading from volatile memory stm32H735

STM32H7 UART - use FIFO and get per-character interrupt?

use std::fstream for SDCARD

OCTOSPI interface for communication with a FPGA

Tag connector on STM32H735G-DK.

Re: Octospi1 Reading from volatile memory stm32H735

Re: Octospi1 Reading from volatile memory stm32H735

Re: Octospi1 Reading from volatile memory stm32H735

Re: Octospi1 Reading from volatile memory stm32H735

Re: volatile const