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AlphaLima / ESP32-Serial-Bridge

Wifi to 3x Serial bridge based on a ESP32
http://www.postfrontal.com/forum/topic.asp?TOPIC_ID=8467
MIT License
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Is there a way to make it work @1MBps ? #10

Open florian-guillemard opened 4 years ago

florian-guillemard commented 4 years ago

Hi, I spend a lot of time to make it work at more than the baudrate of 230400 bps. I need to use it at > 1 000 000 bps but whatever I do, it doesn't :( Any idea ? Did you make it ? Thanks for your help!

AlphaLima commented 4 years ago

No, nerver needed more than 115kBd and this version is not intended to be faster that 230kBd. I'm afraid it cant be faster in polling mode. You can try using serial Rx/Tx interrupts together with DMA filled FIFOs for a higher baudrate. But I doubt you can do with with the arduino IDE https://docs.espressif.com/projects/esp-idf/en/latest/api-reference/peripherals/uart.html#uart-api-using-interrupts

https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf#page=342 https://www.espressif.com/sites/default/files/documentation/esp32_technical_reference_manual_en.pdf#page=116

florian-guillemard commented 4 years ago

Thanks for your reactivity! I'm using the Arduino framework but I work on Platformio.. not sure this is changing something :/ Apparently, my problem is not on the serial but on the TCP! I tried to get (without interrupt) data on Serial(1,3) and put it on Serial(16,17) @ 1Mbps and I'm having NO problems at all..

AlphaLima commented 4 years ago

OK, the data rate depend on the WiFi Link quality, given that you tried different distances and locations. The TCP protocol has a lot of data correction overhead, maybe you switch to UDP and increase the packet sizes for a better payload/overhead ratio.

florian-guillemard commented 4 years ago

Seems that I have just problems from serial to TCP.. not serial to serial and neither TCP to serial :/ The packet size is around 500 and I kept a buffer of 1024.. For my test, i'm using telnet under Macosx, I'm not sure if there is a better solution to test the ESP, if you have something else, I will be glad! Thanks for your help ;)

florian-guillemard commented 4 years ago

It appears that TCPClient.write(buf2, i2) is taking too long. But why is that ?!