Unsupported baud rate 115200

[scargill]

The examples use 115200 baud ratge - yet the compiler complains that it's an invalid baud rate - it still works of course. Can this be removed?

[igrr]

Could you please post the sketch itself and the verbose compiler output when you submit issues? Verbose output can be enabled in the Arduino preferences. Thanks.

void setup() {
  Serial.begin(115200);
}

void loop() {
  // put your main code here, to run repeatedly:
  delay(1000);
  Serial.println("Hello ESP!");

}

This sketch with 115200 seems to work.

[scargill]

Absolutely it compiles no problem and runs no problem but when flashing the chip this is the message I see.. unsupported baud rate – it still works…

Sketch uses 189,636 bytes (36%) of program storage space. Maximum is 524,288 bytes.

warning: unsupported baud rate: 115200, using 115200

Uploading 31488 bytes from C:\Users\Peter\AppData\Local\Temp\build71807972327932918.tmp/sketch_apr02b.cpp_00000.bin to flash at 0x00000000

...............................

Uploading 158184 bytes from C:\Users\Peter\AppData\Local\Temp\build71807972327932918.tmp/sketch_apr02b.cpp_40000.bin to flash at 0x00040000

...........................................................................................................................................................

From: Ivan Grokhotkov [mailto:notifications@github.com]
Sent: 02 April 2015 11:46
To: esp8266/Arduino
Cc: scargill
Subject: Re: [Arduino] Unsupported baud rate 115200 (#37)

Could you please post the sketch itself and the verbose compiler output when you submit issues? Verbose output can be enabled in the Arduino preferences. Thanks.

void setup() {
Serial.begin(115200);
}

void loop() {
// put your main code here, to run repeatedly:
delay(1000);
Serial.println("Hello ESP!");

}

This sketch with 115200 seems to work.

—
Reply to this email directly or view it on GitHub #37 (comment) . https://github.com/notifications/beacon/ABzUg0N4gc7NwypgaHnOftd-OHPFKSWNks5n7RVNgaJpZM4D5FTG.gif

[igrr]

Hmm. How is that possible?

void serialport_setbaudrate(unsigned int baudrate)
{
    DWORD br = 0;
    switch(baudrate)
    {
        case 9600:      br = CBR_9600;      break;
        case 14400:     br = CBR_14400;     break;
        case 19200:     br = CBR_19200;     break;
        case 38400:     br = CBR_38400;     break;
        case 56000:     br = CBR_56000;     break;
        case 57600:     br = CBR_57600;     break;
        case 115200:    br = CBR_115200;    break;
        case 128000:    br = CBR_128000;    break;
        case 256000:    br = CBR_256000;    break;
    }
    if (br == 0)
    {
        LOGWARN("unsupported baud rate: %d, using 115200", baudrate);
        br = CBR_115200;
    }

Puzzled...

[cimba007]

Not sure if this is related but the LOGWARN message looks the same:

Setting the upload speed to 921600 does not work, although 256000 is fine

Der Sketch verwendet 184.858 Bytes (35%) des Programmspeicherplatzes. Das Maximum sind 524.288 Bytes.
D:\Users\Jinja_Admin\Downloads\arduino-1.6.1-p1-windows\arduino-1.6.1/hardware/tools/esp8266/esptool.exe -vv -cd ck -cb 256000 -cp COM23 -ca 0x00000 -cf C:\User
s\Jinja\AppData\Local\Temp\build2025833383679790865.tmp/sketch_apr02a.cpp_00000.bin -ca 0x40000 -cf C:\Users\Jinja\AppData\Local\Temp\build2025833383679790865.t
mp/sketch_apr02a.cpp_40000.bin
esptool v0.4.2 - (c) 2014 Ch. Klippel ck@atelier-klippel.de
setting board to ck
setting baudrate from 115200 to 256000
setting port from COM1 to COM23
setting address from 0x00000000 to 0x00000000
espcomm_upload_file
stat C:\Users\Jinja\AppData\Local\Temp\build2025833383679790865.tmp/sketch_apr02a.cpp_00000.bin success

Der Sketch verwendet 184.858 Bytes (35%) des Programmspeicherplatzes. Das Maximum sind 524.288 Bytes.
D:\Users\Jinja_Admin\Downloads\arduino-1.6.1-p1-windows\arduino-1.6.1/hardware/tools/esp8266/esptool.exe -vv -cd ck -cb 921600 -cp COM23 -ca 0x00000 -cf C:\User
s\Jinja\AppData\Local\Temp\build2025833383679790865.tmp/sketch_apr02a.cpp_00000.bin -ca 0x40000 -cf C:\Users\Jinja\AppData\Local\Temp\build2025833383679790865.t
mp/sketch_apr02a.cpp_40000.bin
esptool v0.4.2 - (c) 2014 Ch. Klippel ck@atelier-klippel.de
setting board to ck
setting baudrate from 115200 to 921600
setting port from COM1 to COM23
setting address from 0x00000000 to 0x00000000
espcomm_upload_file
stat C:\Users\Jinja\AppData\Local\Temp\build2025833383679790865.tmp/sketch_apr02a.cpp_00000.bin success
warning: unsupported baud rate: 921600, using 115200
setting serial port timeouts to 1000 ms

[igrr]

@cimba007 as you see from the code snippet above, 921600 is not supported on Windows (because windows doesn't have CBR_921600 defined), so the output you have posted makes sense.
I think 921600 only works on Linux currently.

What I don't understand is how we can possibly get a message

warning: unsupported baud rate: 115200, using 115200

from the code snippet above...

[cimba007]

Is there a way to increase the baud rate above CBR_256000 with windows? 256000 is already a huge speed improvement but more = better ;-)

It seems odd, since I can do the following:

Serial.begin(512000);

• Open the com-port with e.g. http://www.der-hammer.info/terminal/
• Add Custom baud-rate to config file: 512000

And now I can receive the messages perfectly fine.

[igrr]

Well, just found this:

/* These baudrates work on windows, but are not part of the windows headers */
#ifndef CBR_230400
#define CBR_230400 230400
#endif
#ifndef CBR_460800
#define CBR_460800 460800
#endif
#ifndef CBR_921600
#define CBR_921600 921600
#endif

source

So maybe it's okay to define those on Windows as well.

[4refr0nt]

Ivan!
ESPlorer (written on Java too) has support up to 921600 on any
platform. And on Windows too. I'm using jssc java library for
low-level communication (written on C). But for Arduino IDE may be
other way for supporting high speed.

2015-04-02 20:29 GMT+05:00, cimba007 notifications@github.com:

Is there a way to increase the baud rate above CBR_256000 with windows?
256000 is already a huge speed improvement but more = better ;-)

It seems odd, since I can do the following:

Serial.begin(512000);

• Open the com-port with e.g. http://www.der-hammer.info/terminal/
• Add Custom baud-rate to config file: 512000

And now I can receive the messages perfectly fine.

---

Reply to this email directly or view it on GitHub:
#37 (comment)

[igrr]

I've got a new esptool build ready which adds support for higher baud rates on Windows:
https://ci.appveyor.com/api/buildjobs/i3ih98t8cyby87j6/artifacts/esptool-0.4.2-3-g1e36d49-win32.zip
Could you guys please give it a try? You can unzip this esptool.exe into /hardware/tools/esp8266/esptool.exe
Thanks.

[cimba007]

Perfect! I tryed some different baud-rates and here are the results for my 200kb sketch:

115200 ~21 seconds
256000 ~10.5 seconds
921600 ~ less then 4 seconds

Only rough estimations with stopwatch.

No error messages, works fine

esptool v0.4.2-3-g1e36d49 - (c) 2014 Ch. Klippel ck@atelier-klippel.de
setting board to ck
setting baudrate from 115200 to 921600
setting port from COM1 to COM23
setting address from 0x00000000 to 0x00000000
espcomm_upload_file
stat C:\Users\Jinja\AppData\Local\Temp\build3547006662176080286.tmp/esp8266_serial_test.cpp_00000.bin success
setting serial port timeouts to 1000 ms
opening bootloader

[scargill]

Erm, I've just realised I have no idea how to set the baud rate in this Arduino environment for ESP8266. Someone enlighten me?

[cimba007]

Go to the following path:

arduino-1.6.1-p1-windows\arduino-1.6.1\hardware\esp8266com\esp8266

and update the boards.txt

with the current one from the repository:

https://github.com/esp8266/Arduino/blob/esp8266/hardware/esp8266com/esp8266/boards.txt

Now you can use Tool > UploadSpeed in the Arduino IDE

• use the current esptool.exe to support baud rates above 256000 for windows (igrr's link)

[scargill]

That looked impressive until I compiled and..
C:\Users\Peter\Documents\Arduino\hardware\arduino-esp8266-master\esp8266\cores\esp8266/Arduino.h:181:26: fatal error: pins_arduino.h: No such file or directory

#include "pins_arduino.h"
^