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* FAQ / Troubleshooting Final Draft release readme.md a01-espcomm_sync failed.md a02-my-esp-crashes.md a03-library-does-not-work.md Total of five FAQ items Emoji included pictures folder May need to read again in couple of days for another cleaning Date: Sun Jun 26 18:43:51 2016 +0200 * Frizing schematics added
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| Frequently Asked Questions / Troubleshooting |
The purpose of this FAQ / Troubleshooting is to respond to questions commonly asked in Issues section and on ESP8266 Community forum.
Where possible we are going right to the answer and provide it within one or two paragraphs. If it takes more than that, you will see a link ➡️ to more details.
Please feel free to contribute if you believe that some frequent issues are not covered below.
I am getting "espcomm_sync failed" error when trying to upload my ESP. How to resolve this issue?
This message indicates issue with uploading ESP module over a serial connection. There are couple of possible causes, that depend on type of your module, if you use separate USB to serial converter ➡️
Why esptool is not listed in "Programmer" menu? How do I upload ESP without it?
Do not worry about "Programmer" menu of Arduino IDE. It doesn't matter what is selected in it — upload now always defaults to using esptool.
My ESP crashes running some code. How to troubleshoot it?
The code may crash because of s/w bug or issue with your h/w. Before entering an issue report, please perform initial troubleshooting ➡️
This Arduino library doesn't work on ESP. How do I make it working?
You would like to use this Arduino library with ESP8266 and it does not perform. It is not listed among libraries verified to work with ESP8266 ➡️
In the IDE, for ESP-12E that has 4M flash, I can choose 4M (1M SPIFFS) or 4M (3M SPIFFS). No matter what I select, the IDE tells me the maximum code space is about 1M. Where does my flash go?
The reason we cannot have more than 1MB of code in flash has to do with a hardware limitation. Flash cache hardware on the ESP8266 only allows mapping 1MB of code into the CPU address space at any given time. You can switch mapping offset, so technically you can have more than 1MB total, but switching such "banks" on the fly is not easy and efficient, so we don't bother doing that. Besides, no one has so far complained about 1MB of code space being insufficient for practical purposes.
The option to choose 4M or 1M SPIFFS is to optimize the upload time. Uploading 3MB takes a long time so sometimes you can just use 1MB. Other 2MB of flash can still be used with ESP.flashRead and ESP.flashWrite APIs if necessary.