ESP8266 Community Forum

- Sun Mar 29, 2015 9:48 am #12932 Always have such a output on my serial output, regardless of the sketches. Even using the Blink sketch with only one Serial.println line.
Any idea? I have used fresh unprogrammed ESP-01 boards.

r...lœØrŸ.Œc.ânÀ.ˆà..Œ..‚ì.pŒ<Ž‚Ÿ.ì8.’ŸÇ’ÜäŒ.p...ònnä.Ä;ònĒœä..Ž.bŽcl`.$`.üpònàƒÜ...à‚‡Àl.€..€..€.b€.nâãn€Ä.œ..‚ŒŽx..Œònnî.ÄÁŒŽ.l`.ü.Ü#‚nÀ..r....nrŽ’Ÿ;.„À..‚ìŽ;..pònàÃÜ...àr‡.âœ....€..p..p’œ<.„ÄlŽ‡Œ.p..Œònnî.Äð..r...Ü#‚nÀ$.Œl`.ä8`rn|’’n€..à‚‡.’`..9~.ÄÀ...œ#‚nÀ$.Œ..Œònnî.ÄÈl`..nnàÃ܀..àrÇ.âœ..l...‡8..p’Ü<.ÄÃì.‚Œ.p..Œònnî.ÄÁŒ..l`.ü.œ#‚n€.Ž;....nrŽ’Ÿ;.ÄÀ.?€ìŽ;...rŸÛ’nÀ..à.Çßl`.üŒ..Õ(¤SQS(RQ¨)HT¨)SHHHC…äÿr˜ýÿ
Blink example started

- Sun Mar 29, 2015 6:05 pm #12966 Looks like the output from the bootloader. As far as I can tell, it cannot be disabled.

- Mon Mar 30, 2015 3:01 am #12988 Okay. What a pity. It is disturbing the output. Another question , why is the esptool uploading two parts? First th address 0 part and then the second part of the same sketch. Could you please explain.

- Mon Mar 30, 2015 4:31 am #12997 As a workaround, if you need clean UART output, you can swap serial to GPIO15 and GPIO13.

So for flashing the sketch you connect your USB-TTL to ESP's TXD and RXD. After you call Serial.begin(), call Serial.swap(). UART will start talking on GPIO15(TXD) and GPIO13(RXD).