MicroPython Forum (Archive)

Right, no SPIRAM. Sorry, I didn't make any timing measurements with non-frozen mpy files. I'm curious now .... I'll try it tonight.

Here's another datapoint for the discussion Lolin D32 ("regular" ESP32) board. MicroPython v1.12. ESP32 @240Mhz. I used an oscilloscope to measure the startup time. Startup time = time between rise of the Reset signal and rise of a GPIO pin (which the first MicroPython code that runs). Startup time,...

good suggestion @stijn. I'll update my post to remove the file create bit - left the mode as 'at' --- '+' is for reading and not needed in this use case

Pretty much the same as previous poster ... here is a technique I find useful to identify where application code is crashing on an unhandled exception. wrap the whole application in a try statement log the exception to a text file, using append mode so you can log multiple exceptions force a hardwar...

You might want to check out the ADC Data Collection feature in the Loboris port of the ESP32. https://github.com/loboris/MicroPython_ESP32_psRAM_LoBo/wiki/adc This feature uses an I2S peripheral to read an ADC and collect samples in the background using DMA. This capability is not yet implemented in...

Here is a binary to try out, in a Google Drive folder: https://drive.google.com/open?id=1AlhGXK56J0r8fLR3sivNQ3nvgz57CibY This firmware supports I2S using this commit PR https://github.com/miketeachman/micropython/commit/e4ffadac4cffda29b26ff32dc03b7810868dfa71 and includes the lastest Micropython c...

Is it possible to consider an external watchdog device in your design? That would deliver a more robust implementation than an internal watchdog. The TPS3823-33 device from TI works well for ESP32 designs - it has both a voltage monitor and watchdog timer.

Glad you got it working. Yay!.

After reading your description of the problem I have another idea. What voltage goes to the Catalex SD card reader? 3.3V or 5V? it looks like it needs a 5V input.

The 2nd SD Card you listed is the exact model that I use.

Here is what works for me, using the Lolin D32 Pro hardware. import uos import sdcard from machine import Pin from machine import SPI spi = SPI(1, sck=Pin(18), mosi=Pin(23), miso=Pin(19)) sd = sdcard.SDCard(spi, Pin(4)) uos.mount(sd, "/sd") Two thoughts: - I have problems getting small capacity SD c...

@blmorris Hi Bryan, Thanks responding to this topic. I'd really like to collaborate with you on any future Pyboard I2S work. I think it will beneficial if we can realize good alignment between ports that offer I2S capabilities. e.g. similar behaviour, method names, constants, etc. I have nothing at ...