TDI (GPIO12) functions as a strapping pin and needs to be pulled down when the ESP32 is reset to select a 3.3V LDO output for the flash memory.
This circuit on S_TDI, when jumpered to TDI, will pull TDI/IO12 on the ESP32 low during a power-on reset.
An important distinction is that this circuit ...
Search found 3 matches
- Wed Dec 20, 2017 12:14 am
- Forum: General Discussion
- Topic: Doubled TDI pin on WROVER KIT schematic, why?
- Replies: 2
- Views: 6113
- Fri Nov 10, 2017 3:25 pm
- Forum: General Discussion
- Topic: Using GPIO39 as digital input.
- Replies: 0
- Views: 3721
Using GPIO39 as digital input.
I have configured GPIO39 (SENSOR_VN) to function as a digital input by calling gpio_config() from the IDF.
When I pull GPIO39 of the ESP-WROOM-32 module low with a 3.3V LVTTL gate it seems to oscillate. Attaching a scope shows a (pure) sine wave of 3Vp-p, 15ns period. Touching the scope lead ...
When I pull GPIO39 of the ESP-WROOM-32 module low with a 3.3V LVTTL gate it seems to oscillate. Attaching a scope shows a (pure) sine wave of 3Vp-p, 15ns period. Touching the scope lead ...
- Tue Aug 22, 2017 11:31 pm
- Forum: General Discussion
- Topic: What would you like to see in The Next Chip?
- Replies: 468
- Views: 1083134
Re: What would you like to see in The Next Chip?
Just a few more GPIOs would really make a difference, even 6 to 8 more if the package size can't be increased by much.
Have a way to start synchronized RMT transfers on multiple channels at once.
Fixing the hardware bug (or is it intentional?) where cs_ena_pretrans doesn't work for non-half-duplex ...
Have a way to start synchronized RMT transfers on multiple channels at once.
Fixing the hardware bug (or is it intentional?) where cs_ena_pretrans doesn't work for non-half-duplex ...