About GSpre.1

GSpre.1 · 2020-08-26

Below is my benchmarking of multply-accumulate performance on contiguous memory blocks on the STM32F7508-DK board for three different types of memory (on-chip SRAM, external SDRAM managed by the FMC, and QSPI-connected NOR flash):The horizontal axes ...

GSpre.1 · 2020-08-20

I'm using the template code for the STM32F7508-DISCO from the STM32CubeF7 repository with the only change being that I add a LED toggle and a busyloop to an infinite loop in `main`. The startup code and everything else is per the template.If I flash ...

GSpre.1 · 2020-08-07

The corresponding UART works fine with HAL_UART_Receive. I've confirmed with GDB that this function fails to return. I realize I'm leaving out a lot of details here, but from the documentation I can see a lot of reasons why this function can *fail*, ...

GSpre.1 · 2020-07-20

GSpre.1 · 2020-08-27

I configured the MPU as follows: MPU_Region_InitTypeDef MPU_InitStruct; HAL_MPU_Disable(); MPU_InitStruct.Enable = MPU_REGION_ENABLE; MPU_InitStruct.BaseAddress = SDRAM_DEVICE_ADDR; MPU_InitStruct.Size = MPU_REGION_SIZE_8MB; MPU_InitStruct...

GSpre.1 · 2020-08-27

Exactly. And an order of magnitude slower than the NOR flash. This is indeed what's puzzling me.I will look into the MPU settings about bufferable/cacheable memory. Thank you for the hint!

GSpre.1 · 2020-08-27

Yes, I have caches enabled. If I leave out enabling them, performance drops by an order of magnitude across the board, as expected.That larger sizes produce more cache misses makes sense, and I think that fits well the drop in performance above a cer...

GSpre.1 · 2020-08-26

Ah, thanks! I stupidly thought the weak stub I had in place was a no-op.

GSpre.1 · 2020-08-20

Adding the following interrupt handler fixes things, but I don't understand why:void TIM6_DAC_IRQHandler(void){ HAL_TIM_IRQHandler(&htim6);}

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Performance characteristics of SDRAM on STM32F7508-DISCO board

Code runs fine after `st-flash write`, but not after reset

[STM32F7] What could be a reason that HAL_UART_Receive_IT does not return?

How can I write to the QSPI-connected NOR flash on the STM32F7508-DK using ST-link? Moreover, where is the base address of this flash specified?

Re: Performance characteristics of SDRAM on STM32F7508-DISCO board

Re: Performance characteristics of SDRAM on STM32F7508-DISCO board

Re: Performance characteristics of SDRAM on STM32F7508-DISCO board

Re: Code runs fine after `st-flash write`, but not after reset

Re: Code runs fine after `st-flash write`, but not after reset