MicroPython Forum (Archive)

That is the reset problem mentioned above. You can also tie GPIO0 to GND, then push reset and then start the upload. That is reproducibly.

I just have tried and succeeded to use the built-in SD card on my Wemos LoLin32 Pro. It uses the sdcard.py script from the drivers/sdcard section and the following statements for mounting. import machine, sdcard, os sd = sdcard.SDCard(machine.SPI(1, sck=machine.Pin(14), mosi=machine.Pin(15), miso=ma...

Many ways to rome. I use:

That#s hard to tell without knowing the exact reason @mike teachman had. The obvious observation is, that in his set-up the timing of reset and GPIO0 do not match. GPIO0 low is too late with respect to the end of the reset pulse. But the reasons could be: - GPIO0 is scanned too early (-> Lolin) - th...

i have Micropython on the old LOLIN32 pro running, and I see no reason why it should not do so on the new one.

The D1 mini caused me a lot of trouble, when using it in an application, which needed SPI, I2C, and two more I/O's in addition to the RC/TX. Especially since some of the I/O's are these 'special' ones controlling the boot behavior. Not having many analog pins with the ESP32 is definitely not a probl...

Just a question: Since the device is low on pins, why does it have GND and V3.3 twice?
Sorry if that was mentioned in the video. I could not listen to it.

No. As said, all three time stamps are the same. The file system does not provide more information. And, of course, these time stamps are only reasonable if the time was properly set.
Edit res[7], res[8] and res[9] are these three time stamps.

These are similar to the standard os.stat() of Python. https://docs.python.org/3/library/os.html#os.stat The symbolic names are not supported, and most fields are not supported by the file system. The three time stamps are all the same. So actually, if you code res=uos.stat(filename), you get res[0]...

The should be normal. Once the device is in ufd mode, you have to use the command:

dfu-util --alt 0 -d 0483:df11 -D firmware_file_name