Obviously a pin that needs to be low at boot you can't use with an external pullup, but you could use for something else that won't pull it up at boot.
Efuse read here https://esp32.com/viewtopic.php?f=2&t=1393
Search found 3529 matches
- Thu Mar 09, 2017 1:49 pm
- Forum: General Discussion
- Topic: Unable to boot (read flash) when connected to custom PCB
- Replies: 7
- Views: 10024
- Thu Mar 09, 2017 12:56 am
- Forum: Report Bugs
- Topic: I2C SCL frequency 10% less than it should be at 400kHz
- Replies: 55
- Views: 92132
Re: I2C SCL frequency 10% less than it should be at 400kHz
I was briefly looking at this and it seems there is compensation for rise/fall times built in so that if you have a weak pullup and a long rise time the high period timer is not going to start until the signal goes above 1.8v. Since the negative edge is sharp, the low time is accurate. So this is so...
- Wed Mar 08, 2017 11:33 pm
- Forum: General Discussion
- Topic: Unable to boot (read flash) when connected to custom PCB
- Replies: 7
- Views: 10024
Re: Unable to boot (read flash) when connected to custom PCB
You don't have to avoid strapping pins necessarily just make sure they will be the right state at boot or disable with efuse.
- Wed Mar 08, 2017 10:28 pm
- Forum: General Discussion
- Topic: Unable to boot (read flash) when connected to custom PCB
- Replies: 7
- Views: 10024
Re: Unable to boot (read flash) when connected to custom PCB
Gpio12 is strapping pin for flash voltage but can be disabled with efuse. Check pin list document or data sheet section 2.4 and see latest esptool update.
- Wed Mar 08, 2017 10:00 pm
- Forum: General Discussion
- Topic: Unable to boot (read flash) when connected to custom PCB
- Replies: 7
- Views: 10024
Re: Unable to boot (read flash) when connected to custom PCB
Strapping pins, gpio 12?
- Wed Mar 08, 2017 8:10 pm
- Forum: General Discussion
- Topic: JTAG Debugging "Failed to verify app image @0x10000 <8194>"
- Replies: 8
- Views: 11140
- Wed Mar 08, 2017 5:40 pm
- Forum: General Discussion
- Topic: Simultaneous Wifi AP and Client mode?
- Replies: 1
- Views: 10917
- Wed Mar 08, 2017 5:28 pm
- Forum: General Discussion
- Topic: JTAG Debugging "Failed to verify app image @0x10000 <8194>"
- Replies: 8
- Views: 11140
Re: JTAG Debugging "Failed to verify app image @0x10000 <8194>"
Have you considered setting flash voltage in efuse to bypass mtdi strapping pin?
- Wed Mar 08, 2017 3:08 am
- Forum: General Discussion
- Topic: SSH Client
- Replies: 13
- Views: 32088
Re: SSH Client
Not sure what the advantage of using the esp32 for this is over a script on an android phone or something.
- Tue Mar 07, 2017 9:51 pm
- Forum: General Discussion
- Topic: Works on Sparkfun Thing, but fails on custom ESP-Wroom-32
- Replies: 4
- Views: 7022
Re: Works on Sparkfun Thing, but fails on custom ESP-Wroom-32
Why do they have different bootloader output? You did only app-flash?