feat(uart): backports UART pin attachment from 3.0.0 to 2.0.15

[SuGlider]

Description of Change

Backports all changes made in Arduino Core 3.0.0 to 2.0.15

Backported:

• PR HardwareSerial Available For Write #9319
• PR UART: fixes begin() after a previous begin() :: deleting previous RX/TX buffers and its data  #9095

Tests scenarios

Tested with ESP32-S3, ESP32-S2 and ESP32-C3

Tested using the Serial_All_CPU_Freqs.ino Example and all the backported PRs examples.

Tested with the UART CI Sketch (output example from the S2)

ESP-ROM:esp32s2-rc4-20191025
Build:Oct 25 2019
rst:0x1 (POWERON),boot:0x8 (SPI_FAST_FLASH_BOOT)
SPIWP:0xee
mode:DIO, clock div:1
load:0x3ffe6100,len:0x55c
load:0x4004c000,len:0xa70
load:0x40050000,len:0x29d8
entry 0x4004c18c
Begin when running test successful
C:\Users\espuser\Documents\Arduino\CI_HardwareSerial_test\CI_HardwareSerial_test.ino:581:begin_when_running_test:PASS
Basic transmission test successful
C:\Users\espuser\Documents\Arduino\CI_HardwareSerial_test\CI_HardwareSerial_test.ino:582:basic_transmission_test:PASS
Buffer resize test successful
C:\Users\espuser\Documents\Arduino\CI_HardwareSerial_test\CI_HardwareSerial_test.ino:583:resize_buffers_test:PASS
Change baudrate test successful
C:\Users\espuser\Documents\Arduino\CI_HardwareSerial_test\CI_HardwareSerial_test.ino:584:change_baudrate_test:PASS
Change CPU frequency test successful
C:\Users\espuser\Documents\Arduino\CI_HardwareSerial_test\CI_HardwareSerial_test.ino:585:change_cpu_frequency_test:PASS
Disabled UART calls test successful
C:\Users\espuser\Documents\Arduino\CI_HardwareSerial_test\CI_HardwareSerial_test.ino:586:disabled_uart_calls_test:PASS
Enabled UART calls test successful
C:\Users\espuser\Documents\Arduino\CI_HardwareSerial_test\CI_HardwareSerial_test.ino:587:enabled_uart_calls_test:PASS
Hello from Serial1 to detect baudrate
Auto baudrate test successful
C:\Users\espuser\Documents\Arduino\CI_HardwareSerial_test\CI_HardwareSerial_test.ino:589:auto_baudrate_test:PASS
Peripheral manager test successful
C:\Users\espuser\Documents\Arduino\CI_HardwareSerial_test\CI_HardwareSerial_test.ino:591:periman_test:PASS
Change pins test successful
C:\Users\espuser\Documents\Arduino\CI_HardwareSerial_test\CI_HardwareSerial_test.ino:592:change_pins_test:PASS
End when stopped test successful
C:\Users\espuser\Documents\Arduino\CI_HardwareSerial_test\CI_HardwareSerial_test.ino:593:end_when_stopped_test:PASS

-----------------------
11 Tests 0 Failures 0 Ignored 
OK

Related links

None.

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Unit Test Results

10 files  10 suites   4m 6s ⏱️
  9 tests   9 ✔️ 0 💤 0 ❌
14 runs  14 ✔️ 0 💤 0 ❌

Results for commit 0d24a48.

♻️ This comment has been updated with latest results.