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ESP.restart() doesn't work, typo fixes (#2216)

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New FAQ item: ESP.restart() doesn't work
Write up review / typo fixes
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Krzysztof
2016-07-04 04:46:04 +02:00
committed by Ivan Grokhotkov
parent 31a72cebb0
commit dd1a7e91b8
4 changed files with 60 additions and 49 deletions
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doc/faq/readme.md
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@ -11,7 +11,7 @@ Please feel free to contribute if you believe that some frequent issues are not
### 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 [:arrow_right:](a01-espcomm_sync-failed.md)
This message indicates issue with uploading ESP module over a serial connection. There are couple of possible causes, that depend on the type of your module, if you use separate USB to serial converter [:arrow_right:](a01-espcomm_sync-failed.md)
### Why esptool is not listed in "Programmer" menu? How do I upload ESP without it?
@ -36,3 +36,10 @@ The reason we cannot have more than 1MB of code in flash has to do with a hardwa
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.
### I have observed a case when ESP.restart() doesn't work. What is the reason for that?
You will see this issue only if serial upload was not followed by a physical reset (e.g. power-on reset). For a device being in that state ESP.restart() will not work. Apparently the issue is caused by [one of internal registers not being properly updated until physical reset](https://github.com/esp8266/Arduino/issues/1017#issuecomment-200605576). This issue concerns only serial uploads. OTA uploads are not affected. If you are using ESP.restart(), the work around is to reset ESP once after each serial upload.
Ref. [#1017](https://github.com/esp8266/Arduino/issues/1017), [#1107](https://github.com/esp8266/Arduino/issues/1107), [#1782](https://github.com/esp8266/Arduino/issues/1782)