![]() There are two different driversrequired when using a tinySA or tinySA Ultra. I got this help for one of my projects (OpenHantek6022) that as a Linux based development uses libusb, but it compiles also under Windows and the most downloads I see for the window package from my releases built by GitHub runner. I gave up Windows decades ago (my last was Win2K) and do not regret this decision, so I cannot provide a working solution, just a proposal. Then you can easily use this command line program that is provided by Erik: Wouldn't it be possible if one helpful Windows developer hanging around here provides a signed "inf" file that you have to right-click just once and dfu-util will then be able to see your update port? Then you can drop all these hundredas of MBytes of useless and unstable STM32 stuff. To help ourselves out we can use simple pull-down resistors on both pins (something weak, say 100k-ohm) and then to maintain that state on the BOOT0 pin we’ll need to throw on a heavy capacitor to hold the charge through the reset.On Fri, at 09:11 AM, hwalker wrote: The COM Port is only created in the device manager when the tinySA ultra is not in the DFU mode (see below).Īs learned from some reports here using "dfu-util" is an simple way when you managed to announce the device in DFU mode to the libusb implementation on Windows - e.g. We can configure these by setting this pins as outputs and then setting their state according to the pattern, then following it with a reset call. Since we already know our pattern from the above tables (BOOT0 high, BOOT1 low) after a reset. ![]() What if I want to have this under strict software control? That can be done easily as well! (with some passives to help us out). Either by physically shorting pins on a header or using external circuitry to drive them. Now that we know our timing constraints and what pins to actuate, we can properly place the device into DFU mode at our leisure. As seen in the images below this can take upwards of 100ms! This can vary greatly per the specific device in question. The device latches the state of these pins at a specific time after boot-up. There’s also specific timing criteria that must be met. ![]() The state of the boot pins is only a portion of the picture. ![]() These pins need to be augmented according to Table 2 in the AN2606 app note linked below. On the microcontroller in question they are pins 60, 28, and 7 respectively. To make this work, there are three hardware pins that we care about: BOOT0, BOOT1, and RESET. Sometimes you’re dealing with a larger and more complex system where the STM32 is not the primary processor, you want to prevent accidentally forcing the device into DFU mode by physically requiring the user to augment the device, or you’re simply running low on code space and need to offload it elsewhere. The first is to have the device be manipulated externally to force it into DFU or you can even handle it completely in firmware! Invoking DFU Externally There are two main ways to force a device into DFU mode. This can be critical if you need to update the firmware of a device in the field or to streamline a production or development process. It allows for quick and easy updates to a device’s firmware without the need of extra piece of hardware. DFU (Device Firmware Update) mode is an incredibly useful feature on modern microcontrollers.
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