Search found 51 matches

by Scalpel78
Thu Apr 06, 2017 7:38 pm
Forum: General Discussion
Topic: Problem with librtc.a after updating esp-idf from GitHub
Replies: 2
Views: 4305

Problem with librtc.a after updating esp-idf from GitHub

Hi, I just updated to the latest version of esp-idf from GitHub, and now I get an error I didn't have before. Doing a 'make all' now results in: make: *** No rule to make target '/home/frode/esp/esp-idf/components/esp32/lib/librtc_pm.a', needed by '/home/frode/GIT/Ghost/ESP32/Blinky/build/app-templa...
by Scalpel78
Wed Mar 22, 2017 10:59 pm
Forum: Report Bugs
Topic: I2C SCL frequency 10% less than it should be at 400kHz
Replies: 55
Views: 90628

Re: I2C SCL frequency 10% less than it should be at 400kHz

I assume the sensor is being tested in isolation so no other i2c devices are present. I don't see pull-up resistors on the breakout board I looked at ( http://www.robot-electronics.co.uk/files/gp2y0e02b_e.pdf ) - what value of pull-up resistors are you using for this? (Typical value is 4.7Kohm). Ed...
by Scalpel78
Wed Mar 22, 2017 2:37 pm
Forum: Report Bugs
Topic: I2C SCL frequency 10% less than it should be at 400kHz
Replies: 55
Views: 90628

Re: I2C SCL frequency 10% less than it should be at 400kHz

I just want to drop a line here. I'm also seeing similar problems like MartyMacGyver. In my case I'm using an I2C based IR-sensor. It works for a few minutes, and then the ESP32 looses connection with the device. I haven't been able to troubleshoot this as much as MartyMacGyver has, but with my Sale...
by Scalpel78
Sun Mar 19, 2017 10:05 pm
Forum: General Discussion
Topic: Max current from a GPIO pin?
Replies: 3
Views: 8886

Re: Max current from a GPIO pin?

Thanks for the reply. 12mA is not a lot, so I'll include a transistor to drive my two leds.
by Scalpel78
Sat Mar 18, 2017 11:04 pm
Forum: General Discussion
Topic: Max current from a GPIO pin?
Replies: 3
Views: 8886

Max current from a GPIO pin?

Hi, this is probably one of the most basic questions here, but how much current can one GPIO pin supply on the ESP-WROOM-32?
by Scalpel78
Sun Mar 12, 2017 7:39 pm
Forum: General Discussion
Topic: Understanding non-connected resistors in reference schematic
Replies: 6
Views: 8549

Re: Understanding non-connected resistors in reference schematic

Hi rudy, ok, so let me see if I understand correctly. GPIO0 and GPIO2 are strapping pins. GPIO0 needs to be high when flashing. And when R7 is not connected, it is driven high by the internal pull-up resistor. After booting it behaves like a generic push-button. Correct? Hmm, no, I still don't get i...
by Scalpel78
Sun Mar 12, 2017 1:01 pm
Forum: General Discussion
Topic: Understanding non-connected resistors in reference schematic
Replies: 6
Views: 8549

Re: Understanding non-connected resistors in reference schematic

And another question about the reference board - is it correct that the button for GPIO0 is no longer needed?
by Scalpel78
Sun Mar 12, 2017 12:58 pm
Forum: General Discussion
Topic: Understanding non-connected resistors in reference schematic
Replies: 6
Views: 8549

Understanding non-connected resistors in reference schematic

Hi, when looking at the schematics for the reference board, ESP Core Board v2 , I see there are four non-connected resistors. R19 and R20 seems to optionally connect RTS and CTS with GPIO13 and GPIO15. R7 and R5 are optional pull-up, and pull-down, resistors for GPIO0 and GPIO2. What is the purpose ...
by Scalpel78
Thu Mar 09, 2017 8:31 am
Forum: General Discussion
Topic: Unable to boot (read flash) when connected to custom PCB
Replies: 7
Views: 9862

Re: Unable to boot (read flash) when connected to custom PCB

Hi, right now I've got GPIO_12 pulled high by the I2C pullup resistors. Can you elaborate what you mean about "right state at bootup"? Do you mean via hardware or software? Do you mean I can fix the problem using something like the gpio_pad_select_gpio() method? I searched the ESP-WROOM-32 datasheet...