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JGerb · 2024-01-22

I'm using an STM32L475RC with USB host and using FAT FS to read a memory stick. This worked fine in previous hardware build, but since new hardware and update of CubeMX (now at MCU pkg 1.17.2) and updated USB host, an odd bug has appeared. When I run...

JGerb · 2020-05-25

Please help if you can, but please do me the courtesy of reading in full before replying: We have a product using STM32L475 with a 32768Hz clock on the LSE. When I attempt to tune the crystal oscillator to within the performance spec of the crystal ....

JGerb · 2019-11-15

I have found something which is unexpected behaviour / errata in the STM32G071's DAC. In summary, once the DAC channel is enabled (in this case I'm using CH2) then the pin cannot be used as a normal GPIO output, even if the DAC's output buffer is dis...

JGerb · 2019-01-09

I’m using the STM32L476 discovery kit to test an application where a battery-powered product powers up a USB memory stick, connects to it, writes some data, and then shuts the stick down again, removing power. I've used the STM32 Cube to generate the...

JGerb · 2024-01-30

Thank you, those were all good suggestions. It's taken me a while to get time on this, and I've had the usual problems with inconsistent results under the debugger, so I've resorted to printf statements on a serial port to debug. I have found that th...

JGerb · 2024-01-26

It cannot be missing the 48MHz clock, as I am using the MSI, and also am running the micro on the same clock (SW =0 in RCC_CFGR). I cannot access OTG_PCGCCTL as the debugger will not show it, even when I add the expression USBx_PCGCCTL (as copied fro...

JGerb · 2024-01-24

STM32CubeIDE doesn't show the OTG registers in the SFR box, I had to add an expression after careful searching in the code.So on the first call, it seems the CSRST bit is set during USBH_Init(). Diving deeper into USBH_Init I see both CSRST and AHDID...

JGerb · 2024-01-22

Thanks, that would make sense, it's a good tip. I switch to 48MHz MSI clock just before init'ing the stack and drop back to 4MHz once done. But it seems the clock switch always works ok. I have even tried adding a 1s delay after clock switch and befo...

JGerb · 2024-01-22

I guess I wasn't expecting it to not work. Eclipse and I are not friends, and the last time I did this it took a week out of my project timelines with fault finding and head scratching. I guess I could try create a new project and start from scratch ...

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STM32L475 USB host w/ memory stick doesn't work first insert

STM32L475 LSE crystal oscillator doesn't tune correctly - gmCrit value on datasheet is very low

Errata : STM32G DAC use precludes use of associated GPIO pin, even when DAC output disabled.

USB host, mass storage class - how to tell when memory stick has completed writes and is safe to power down.

Re: STM32L475 USB host w/ memory stick doesn't work first insert

Re: STM32L475 USB host w/ memory stick doesn't work first insert

Re: STM32L475 USB host w/ memory stick doesn't work first insert

Re: STM32L475 USB host w/ memory stick doesn't work first insert

Re: STM32L475 USB host w/ memory stick doesn't work first insert