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zoomcityzoom · 2011-08-11

Posted on August 11, 2011 at 21:21ISSUE 1: PA9/OTG_FS_VBUS +5V ToleranceWhen the STM32F105 is configured as a USB device, the PA9/OTG_FS_VBUS is used to detect the presense of a USB host. ST Micro evaluation designs show the PA9/OTG_FS_VBUS pin conn...

zoomcityzoom · 2011-08-15

Posted on August 15, 2011 at 18:04Thank you STOne-32 for your response.Are you saying that in the bootloader, USART1 is enabled with PA9 configured as TX data output and at the same time to use DFU we need to apply +5V to PA9/OTG_FS_VBUS and that th...

zoomcityzoom · 2011-08-12

Posted on August 12, 2011 at 19:10Back to the main issue here:When the STM32F105 is configured as a USB device, the PA9/OTG_FS_VBUS is used to detect the presense of a USB host. ST Micro evaluation designs show the PA9/OTG_FS_VBUS pin connected to +...

zoomcityzoom · 2011-08-12

Posted on August 12, 2011 at 17:35Thank you STOne-32 and CrashAndBurn,I found a design error that was causing the processor to randomly enter the bootloader. We have an LCD controller that shares the PC2/BOOT0 GPIO that was sometimes driving it's ou...

zoomcityzoom · 2011-08-11

Posted on August 12, 2011 at 00:55It looks like the bootloader is entered upon power-up regardless of the state of BOOT0 if the STM32 is mass erased. Anyone able to confirm this? I don't see anything in the datasheet about this behavior.

zoomcityzoom · 2011-08-11

Posted on August 12, 2011 at 00:44UPDATE: After further testing...ISSUE 1: With PA9/OTG_FS_VBUS connected to +5V VBUS or VDD, upon entering DFU bootloader the PA9/OTG_FS_VBUS pin will ALWAYS sink 45 mA.ISSUE 2: With a 10K pull-down on BOOT0, and app...

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STM32F105 PA9/OTG_FS_VBUS Issues

Re: STM32F105 PA9/OTG_FS_VBUS Issues

Re: STM32F105 PA9/OTG_FS_VBUS Issues

Re: STM32F105 PA9/OTG_FS_VBUS Issues

Re: STM32F105 PA9/OTG_FS_VBUS Issues

Re: STM32F105 PA9/OTG_FS_VBUS Issues