About JCase.1

JCase.1 · 2024-04-16

This should be simple, but I can't find documentation. I am running an STM32L4P5 at max clock speed (120 MHz), and I have moved all code to SRAM so it is running with zero wait states. I have an extensive calculation to do using the FPU -- I am ...

JCase.1 · 2023-12-29

I have designed a set of boards for a client with one USB interface to the main controller. We can bootload it by the usual methods, and bootload the CPUs on the other boards by pass-thru from the main controller. I send coded messages to the main ...

JCase.1 · 2023-03-29

I have an application running on an STM32L4P5. Initially, I programmed and debugged with J-Link on the micro 9-pin SWDIO connector. All worked great, I could use J-Mem to peer into sram or flash in real time. Then I built a bootloader over USB, using...

JCase.1 · 2023-02-04

I am working with several STM32, let's focus on the STM32L4P5. I wrote a windows utility which does a nice job of loading code with the bootloader, per the AN3155 documentation. It is nicely robust, and I've been using it for a couple months. I wan...

JCase.1 · 2022-12-30

JCase.1 · 2024-04-16

Never mind, the same documentation page answered that second question in the footnotes -- they DO proceed in parallel, apparently. I'll have to interleave FPU and non-FPU functions cleverly to get more speed.

JCase.1 · 2024-04-16

Another question on the same topic. If the FPU 32 divide and square root instructions take 14 clock ticks, and the FPU is a true co-processor with a separate pipeline, does that mean that I can launch a divide (or square root) and do 14 ticks wor...

JCase.1 · 2024-04-16

You guys are great. This is what I expected from my benchmarking on the scope. I was suspecting that coding the expression: (A*B*C)/(D*E*F) is far more efficient being coded as: ANS = A*B, ANS = ANS*C, S0 = D*E, S0 = S0...

JCase.1 · 2023-03-29

No. sorry for the misunderstanding. With the bootloader, I can reprogram the CPU over the USB cable. Then run the embedded code (which has some console I/O over the USB as a comport). Before I ever programmed via bootloader, I could hook up J...

JCase.1 · 2023-02-05

No. I'm not using Cube. I have a product with several embedded STM32 micros, and I need to be able to reprogram any of them via a single USB port. I need to use the bootloader, and I need custom code to do this so that I can use the micro riding...

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Do all FPU operations proceed in a single SYSCLK tick?

need to read BOOT0 pin on STM32H725

STM32L4P5CG and bootloader programming appear to have L1 mem protection set now

STM32 - bootloader commands for readout protect/unprotect not working...?

STM32L4P5 - I understand that a "load multiple registers" takes multiple clock cycles to execute. can an interrupt break in the middle of this or does it wait till after the set of loads is complete?

Re: Do all FPU operations proceed in a single SYSCLK tick?

Re: Do all FPU operations proceed in a single SYSCLK tick?

Re: Do all FPU operations proceed in a single SYSCLK tick?

Re: STM32L4P5CG and bootloader programming appear to have L1 mem protection set now

Re: STM32 - bootloader commands for readout protect/unprotect not working...?