About MSull.1

MSull.1 · 2021-09-16

Hi, I'm working on an STM32H7 project with very fast (800 KHz) periodic interrupt. I've been looking at the generated code as I tweak the C source. I'm confused about the use of "volatile" for the global variables used by the ISR.I feel like I need...

MSull.1 · 2021-01-30

I'm an Atmel SAM person migrating to STM32... How big is the flash in the STM32H730??? The first page of the data sheet clearly says it is 128 KB but RM0468, Table 1-14, says there is 128KB of "system" flash and 128KKB of "user" flash.And, software ...

MSull.1 · 2021-09-27

On reflection, I realize that I've seen this same problem before with a UART ISR.

MSull.1 · 2021-09-27

What I really meant was it would have been less effort on my part to write it in assembly instead of cajoling gcc into doing what I wanted. The additional advantage might be that the assembly wouldn't change if rebuilt with some future version of th...

MSull.1 · 2021-09-26

Well, Piranha, you caught me ;) In an (apparently misguided) effort to simplify my posts and save future readers from wading through unrelated code, I keep writing analogous but simplified code. Then you or Pavel spot the missing parts! This is what ...

MSull.1 · 2021-09-26

I see what you're saying but I don't really have a locking problem. I am using volatile on a variable (rate) because it is written by the foreground and read by the ISR. Neither is a read/modify/write. The foreground writes the variable and the ISR r...

MSull.1 · 2021-09-25

Yes, that makes sense. Reordering would cause the symptom I am seeing. Especially since it doesn't happen every time the ISR runs.Thanks!

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STM32H730 Flash Size

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