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meshtastic
[Bug]: 1.3 Serial Module Does not work
Category
Serial
Hardware
T-Beam
Firmware Version
1.3.41
Description
When using a tbeam on a Mac, the serial module is not working
Setup:
Tbeam 1.1 with:
Serial Enabled Echo Enabled RXD set to pin 35 TX set to pin 15 Baud default Mode: Text message
5v and gnd connected
Expected behavior Using tio for serial
echo 'test serial messge' | tio /dev/tty.wchusbserial1130 --response-wait would send a message that will be received on the broadcast channel
Relevant log output
No response
This issue has been mentioned on Meshtastic. There might be relevant details there:
https://meshtastic.discourse.group/t/lilygo-ttgo-1-3-40-915mhz-lora32-hardware-serial-not-usb/6487/6
This issue has been mentioned on Meshtastic. There might be relevant details there:
https://meshtastic.discourse.group/t/help-with-serial-module-transmit-receive-text-message-on-tbeam/6527/4
This is what I get in the serial log when sending data
ets Jul 29 2019 12:21:46
rst:0x1 (POWERON_RESET),boot:0x13 (SPI_FAST_FLASH_BOOT) configsip: 0, SPIWP:0xee clk_drv:0x00,q_drv:0x00,d_drv:0x00,cs0_drv:0x00,hd_drv:0x00,wp_drv:0x00 mode:DIO, clock div:2 load:0x3fff0030,len:1184 load:0x40078000,len:13132 load:0x40080400,len:3036 entry 0x400805e4 [???mum????2-hal-cpu.c:214] setCpuFrequencyMhz(): PLL: 480 / 2 = 240 Mhz, APB: 80000000 Hz
And ??:??:?? 2 [SerialModule] Initializing serial peripheral interface [ 2646][E][HardwareSerial.cpp:506] setRxBufferSize(): RX Buffer can't be resized when Serial is already running.
the RX buffer complaint comes from using the new ESP32 toolkit. I'll have a look
Test configs
38400 Baud
For a tbeam the module config is serial.enabled true serial.rxd 35 serial.txd 15 serial.timeout 1000 serial.echo true serial.mode TEXTMSG
For rak use
serial.enabled true serial.rxd 15 serial.txd 16 serial.timeout 1000 serial.echo true serial.mode TEXTMSG
Hmm, is it OK that for RAK pins 15 and 16 are used for GPS?
https://github.com/meshtastic/Meshtastic-device/blob/ade32b1827b7dc554716625e50c3ccfd8b87085b/variants/rak4631/variant.h#L101-L102
https://github.com/meshtastic/Meshtastic-device/blob/ade32b1827b7dc554716625e50c3ccfd8b87085b/variants/rak4631/variant.h#L198-L199
After I fixed pins according to original variant.h: https://github.com/RAKWireless/RAK-nRF52-Arduino/blob/ca1dd0b2b17a9bd12a6d9a4d0f39b528e2104efc/variants/WisCore_RAK4631_Board/variant.h#L122-L123
Serial module started working (at least I can get output on TX0/RX0 pins).
Yes, just re-checked, having this only change:
-#define PIN_SERIAL2_RX (8)
-#define PIN_SERIAL2_TX (6)
+#define PIN_SERIAL2_RX (19)
+#define PIN_SERIAL2_TX (20)
Serial module fully works.
Use the module config, manually updating the firmware is not the desired result
Yes meshtastic --set serial.rxd 15 --set serial.txd 16 should do it. You can set this to any available GPIO ports that are capable of serial though.
Right, I just wanted to mention that serial module works with 19/20 pins and does not with 15/16 because they are GPS :)
@jfirwin we have a bunch of serial module stuff working that we should document. Anyone here with a working config it would be great if we could get a board picture and your config.
Closing this. Serial module has been confirmed working for text message and should for the other portnums. Hopefully we'll get some of these avenues documented for folks.
Just small note - text messages sent through serial appeared in main channel and not in "serial" channel. If it is desired, then OK.
That's a good thing. If they're sent over the serial portnum, they wouldn't show up in the messages for the apps. Which is a use case for some.