About JDoe.7

JDoe.7 · 2021-10-17

I have a custom PCB with a STM32H7A3ZI MCU, and a S27KL0642S27KS0642 Hyperbus RAM.My code, as well as the app note (AN5050) I'm following sets up the RAM for memory mapped access.I've checked and rechecked the pinout and configuration, but every time...

JDoe.7 · 2021-11-04

Thanks very much, I've been experimenting with this extensively.When reading from the RAM in this way the chip no longer locks up every run! Now I can finally do some real debugging!I can read address 0 of the register space, and I get a value close ...

JDoe.7 · 2021-10-20

I ended up painstakingly tapping all the signals with a logic analyzer. The result looks like this (see below). I increased the clock divider to 20, so it's running at 1MHz now. It appears that the MCU is accessing the ram over and over. I think that...

JDoe.7 · 2021-10-18

Ok, I just tried to implement the delay block, but if I try to use the calibration function from AN5050, it requires reading from the RAM, and that locks up the chip the same as when I do it.. so that's out.

JDoe.7 · 2021-10-18

Thank you for the suggestion, but how do you think that would help? Right now I can't access the memory mapped region at all. I'm not familiar with the MPU, but it seems tailored to controlling *what* can access certain memory regions. I have not exp...

JDoe.7 · 2021-10-18

Whenever I try to check the memory location with the debugger it crashes the same way as if I executed the read in code.I will try to implement the delay block and see if that helps, but I've been shooting in the dark for a long time, so I'm hoping t...

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My STM32 locks up when I try to access a memory mapped external RAM. Cannot be reprogrammed.

Re: My STM32 locks up when I try to access a memory mapped external RAM. Cannot be reprogrammed.

Re: My STM32 locks up when I try to access a memory mapped external RAM. Cannot be reprogrammed.

Re: My STM32 locks up when I try to access a memory mapped external RAM. Cannot be reprogrammed.

Re: My STM32 locks up when I try to access a memory mapped external RAM. Cannot be reprogrammed.

Re: My STM32 locks up when I try to access a memory mapped external RAM. Cannot be reprogrammed.