Search found 26 matches

by hgptamn
Thu Feb 22, 2018 4:17 pm
Forum: General Discussion
Topic: ESP32 as ISP
Replies: 20
Views: 28220

ESP32 as ISP

Hi! Is there a way to use an ESP32 as an ISP for another ESP32? I have managed to access the external flash of the board that needs to been programmed, by exposing it's pins and disabling it's CPU (by tying CHIP_PU line to GND). This way the external flash memory that needs to be programmed it's not...
by hgptamn
Thu Feb 22, 2018 2:31 pm
Forum: ESP32 Arduino
Topic: Setting GPIO as High Impedance
Replies: 0
Views: 6389

Setting GPIO as High Impedance

Hi! Is there a way to set a GPIO pin as a high impedance pin? I'm trying to program an ESP32 (board 1) external flash, using another ESP32 (board 2) conected via SPI. I can access board 1 external flash using board 2, but once I do that board 1 is not able to boot anymore, as the SPI lines seem to n...
by hgptamn
Wed Feb 14, 2018 11:45 am
Forum: ESP-IDF
Topic: ESP32 PSRAM support
Replies: 112
Views: 194847

Re: ESP32 PSRAM support

To all newbies out there (me included) testing pSRAM compatibility with their boards, here's what I did to get it working. First of all make sure you're on the latest ESP-IDF verison . I'm on ESP-IDF v3.1-dev-380-gca3faa61 2nd stage bootloader as of testing this. Second of all do you see SPI SRAM (s...
by hgptamn
Thu Feb 01, 2018 11:53 am
Forum: ESP32 Arduino
Topic: ESP32 ADC Non-linear Issues - How do I fix / change Attenuation or width?
Replies: 43
Views: 127685

Re: ESP32 ADC Non-linear Issues - How do I fix / change Attenuation or width?

Getting an official answer from Espressif, they do plan on fixing the factory calibration in the near future
by hgptamn
Tue Jan 30, 2018 1:48 pm
Forum: Hardware
Topic: ADC input impedance
Replies: 6
Views: 19277

Re: ADC input impedance

I would also like to know that; couldn't find it either!
by hgptamn
Mon Oct 16, 2017 4:49 pm
Forum: ESP32 Arduino
Topic: 128kSPS fast ADC data logging and processing
Replies: 1
Views: 4761

128kSPS fast ADC data logging and processing

Hi all, I recently got a task to do using the AD7767 128 kSPS 24-bit ADC. The task states that I need to plot the output of the ADC on a time scale. (the ADC is hooked up to a load cell). I've worked with slower ADCs in the past (@4.8kSPS) and what I used to do then is print the values along with mi...