I would also appreciate a thorough documentation of TASK- and RTC-Watchdog. Our use case is the same as bkgoodman. Some of our products are used in really remote areas were user reset is not an option or would cause a technician to drive several hundreds of kilometers to do a manual reset. Since we ...

I've checked the pullups and added hardware pullups to IO_2 and IO_12 but still no success in 4-Bit mode.
Since it works in 1-Bit mode I assume DATA0 to be okay. So the question is: why would I only get this error in 4-Bit-Mode?

Has anybody an indication an what could be tested if just the 4-bit mode fails while 1-bit works? Is there something I can learn from the error messages? Can I measure something? For reference again, this was the error message: I (3487) example: Try mount sd card E (3507) sdmmc_cmd: sdmmc_read_secto...

I've tested the code example and for me it only worked in 1-Line-Mode (on the breadboard with Nano32-Board). I omitted IO_2 and IO_12 Pullups and activated them in software. For the 1-Wire code I get: I (1649) example: Initializing pull-ups I (1649) cpu_start: Starting scheduler on APP CPU. I (2649)...

Great to hear its working for you Rudi! Did you do anything about IO13 and IO12? If you have not modified anything could you confirm that IO12 is floating (in terms of no pullup) or did enable software pullups here? For IO13 could you confirm it's beeing pulled between GND and 3V3? Also one note on ...

Since the schematics of devKitJ V2 have been released we were about to take this as a reference. These schematics rise two questions for me: (find schematic screenshots attached) - R_IO13 seams to be fitted with a pullup (R156) and a pulldown (R50) at the same time that does not make any sense for m...

I plan on releasing a preliminary SPI master driver somewhere next week. That sounds good. To be exact here: are we talking "only" about the driver for the SPI-Peripheral here or rather a "full-blown" solution for SD-Cards like the Arduino SD-Lib with SPI driver and FAT32 support? It looks like Lad...

I found out today that the SDMMC interface is actually unlike most others and cannot be muxed via the GPIO Matrix, it has to be connected to the physical pins marked in the datasheet. Sorry for giving you the wrong information on this. You can still reroute the VSPI signals around via the GPIO Matr...

Thanks for the detailed reply Angus! From a hardware point of view I'm tempted to do the following: route the "default" VSPI-Pins to the SD Card interface with two additional pins for if I want to route the native MMC interface via GPIO_MUX. One thing on the side: I'm still not quite sure on the imp...

We have been testing the ESP32 a few weeks now and are amazed by this chip. There is one thing though that bothers/hinders us in the current development of the hardware of one of our projects: SD Card support. To put this first: this is not a high throughput multimedia type of application but rather...