Search found 5 matches

by mirkomirko
Mon Oct 16, 2023 11:17 am
Forum: ESP-IDF
Topic: Setting VDD_SDIO to 3.3V in software, overriding MTDI strapping pin?
Replies: 4
Views: 1306

Re: Setting VDD_SDIO to 3.3V in software, overriding MTDI strapping pin?

The problem with "leaving it so as it is" is, that the struct's default vals are already not the defaults the ESP32 starts with. As you can see from quoted headers, `force` and `enable` are set to `1` which is clearly not how the ESP32 behaves (as it reads MTDO by default). Hence, I'm concerned abou...
by mirkomirko
Sat Oct 14, 2023 12:37 pm
Forum: ESP-IDF
Topic: Setting VDD_SDIO to 3.3V in software, overriding MTDI strapping pin?
Replies: 4
Views: 1306

Re: Setting VDD_SDIO to 3.3V in software, overriding MTDI strapping pin?

Thank you! I'm still unsure about the meanings and values for `drefh`, `drefm` and `drefl`, though.
by mirkomirko
Fri Oct 13, 2023 11:54 am
Forum: ESP-IDF
Topic: Setting VDD_SDIO to 3.3V in software, overriding MTDI strapping pin?
Replies: 4
Views: 1306

Setting VDD_SDIO to 3.3V in software, overriding MTDI strapping pin?

I'm using a Wrover-module on a custom PCB and made a mistake by not being able to guarantee that the strapping pin MTDI is alwa ys pulled low during power-up in order to operate the (wrover-)internal flash with 3.3V instead of 1.8V, as the latter results in failing write ops (reads are fine, at leas...
by mirkomirko
Thu Aug 31, 2023 8:13 am
Forum: Hardware
Topic: ESP32 Wrover-E - internal SPI connected flash *always* 3.3V?
Replies: 3
Views: 1607

Re: ESP32 Wrover-E - internal SPI connected flash *always* 3.3V?

Thank you! Could you shed some light on why IO12 is actually used as a strapping pin on the wrover module? Why isn't the eFuse burned by default, as one of the main purposes of the wrover-module is to have additional *internal* flash? (internal as in: part of the module; I know from the bare-metal S...
by mirkomirko
Tue Aug 29, 2023 12:27 am
Forum: Hardware
Topic: ESP32 Wrover-E - internal SPI connected flash *always* 3.3V?
Replies: 3
Views: 1607

ESP32 Wrover-E - internal SPI connected flash *always* 3.3V?

I'm using the ESP32 Wrover-E with additional flash (16MiB) and overlooked GPIO12 being a strapping pin configuring whether the internally SPI connected flash is powered by 1.8V or 3.3V. GPIO12 is used as MISO on our board, whereas the ESP32 is the master and the partner is slave. Hence, the slave is...