arduino-esp32
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espressif
Serial2 wont work.
Board
ESP32-WROOM-32D
Device Description
Breadboard.
Hardware Configuration
IO17 and IO16 to GPS.
Version
latest master (checkout manually)
IDE Name
Arduino
Operating System
Windows 10
Flash frequency
80Mhz
PSRAM enabled
yes
Upload speed
921600
Description
I am using Serial2 to connect to UBX Neo6m. After 2.0.15, it doesnt work anymore.
Sketch
Serial passthrough
Debug Message
NA
Other Steps to Reproduce
No response
I have checked existing issues, online documentation and the Troubleshooting Guide
- [X] I confirm I have checked existing issues, online documentation and Troubleshooting guide.
@khryssmar - please provide more information and a simple sketch that can be used to reproduce the issue.
Thanks in advance.
A quick test reports that Serial2 is using pins 4 and 25 by default... I'll investigate it.
ets Jun 8 2016 00:22:57
rst:0x10 (RTCWDT_RTC_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:1
load:0x3fff0030,len:1344
load:0x40078000,len:13964
load:0x40080400,len:3600
entry 0x400805f0
[ 4][D][esp32-hal-cpu.c:244] setCpuFrequencyMhz(): PLL: 480 / 2 = 240 Mhz, APB: 80000000 Hz
[ 37][V][esp32-hal-uart.c:330] uartBegin(): UART2 baud(115200) Mode(800001c) rxPin(4) txPin(25)
[ 46][V][esp32-hal-uart.c:416] uartBegin(): UART2 not installed. Starting installation
[ 56][V][esp32-hal-uart.c:463] uartBegin(): UART2 initialization done.
Yes... it was the PR https://github.com/espressif/arduino-esp32/pull/8800 from 3.0.0 that has been imported into 2.015 by https://github.com/espressif/arduino-esp32/pull/9176
This breaks the UART pins...
| Name | ESP32 | S2 | S3 | C3 | |
|---|---|---|---|---|---|
| UART0 RX | SOC_RX0 | 3 | 44 | 44 | 20 |
| UART0 TX | SOC_TX0 | 1 | 43 | 43 | 21 |
| UART1 RX | RX1 | ~9~ -> 26 | ~18~ -> 4 | 15 | 18 |
| UART1 TX | TX1 | ~10~ -> 27 | ~17~ -> 5 | 16 | 19 |
| UART2 RX | RX2 | ~16~ -> 4 | -- | 19 | -- |
| UART2 TX | TX2 | ~17~ -> 25 | -- | 20 | -- |
@khryssmar - a quick workaround would be to initialize Serial2 passing the pins, for example:
Serial2.being(115200, SERIAL_8N1, 16, 17); // baud rate, mode, RxPin, TxPin
The Serial2 pins were changed because psram is typically on 16 & 17. With a WROOM module, they are available.
It was changed for 3.0.0 as a breaking change. But for 2.0.x it should reamain the same, not breaking previous sketches.
Issue is solved, will be included in release 2.0.16, which we will release in approximately one week. We will wait for a while to test and possibly catch other issues.
Thanks @khryssmar for quick response and pointing out this problem!
I'm experiencing the same problem, as I installed 2.0.15 version. How can I take the 2.0.16? The IDE shows 2.0.15 as latest version:
Hello,
2.0.16 is not released yet, we are still working on it. We will release it in 1 - 2 weeks.
@VojtechBartoska thanks.
I read that 3.0 will have a breaking change. Where do I find the corresponding code for using Serial2?
Thanks again!
I would like to reopen the issue. Encountered this again. Please fix. @SuGlider
@VojtechBartoska thanks.
I read that 3.0 will have a breaking change. Where do I find the corresponding code for using Serial2?
Thanks again!
https://docs.espressif.com/projects/arduino-esp32/en/latest/migration_guides/2.x_to_3.0.html#id14
I would like to reopen the issue. Encountered this again. Please fix. @SuGlider
This change is valid for Arduino Core 3.x.x Explanation in https://github.com/espressif/arduino-esp32/issues/10152#issuecomment-2286991672
Arduino Core 2.0.15, 2.0.16 and 2.0.17 had a mistake using new pins. Arduino Core 2.0.14 and lower use the original pins.
Arduino Core from release/v2.x branch uses the same pins as before:
Fixed with https://github.com/espressif/arduino-esp32/pull/9502