Tested with below sketch on a Nucleo-WL55JC1.
Serial1 is instantiate with CTS/RTS. With original code, it wait forever while with this PR it continue afterTIMEOUT_TX expiration.

HardwareSerialSerial1(PB7, PB6, PB3, PB4);uint32_t baud_val[] = {1200,2400,4800,9600,115200,250000};// the setup routine runs once when you press reset:voidsetup() {// initialize serial communication at 9600 bits per second:  Serial.begin(9600);}// the loop routine runs over and over again forever:voidloop() {for (uint8_t idx =0; idx <6; idx++) {    Serial1.end();    Serial.printf("Test %u\n", baud_val[idx]);    Serial1.begin(baud_val[idx]);    Serial1.println("ATE0");  }delay(100);}

Output

09:20:52.421 -> Test 120009:20:53.419 -> Test 240009:20:54.384 -> Test 480009:20:55.383 -> Test 960009:20:56.380 -> Test 11520009:20:57.379 -> Test 25000009:20:58.473 -> Test 120009:20:59.471 -> Test 240009:21:00.470 -> Test 480009:21:01.465 -> Test 9600

fpistm added2 commits

September 8, 2023 08:58

chore(serial): allows TX_TIMEOUT redefinition

e6ad4b1

Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

feat(serial): add timeout support to flush()

96cba70

when called by end().Default, no timeout (0). When called by end(), default timeout isTX_TIMEOUT which can be redefined if needed.Fixesstm32duino#2122Signed-off-by: Frederic Pillon <frederic.pillon@st.com>

fpistm added enhancement

New feature or request

fix 🩹Bug fix labels

Sep 8, 2023

fpistm added this to the2.7.0 milestone

Sep 8, 2023

fpistm merged commit6f39b41 intostm32duino:main

Sep 11, 2023

fpistm deleted the Serial_flush_timeout branch

September 11, 2023 07:19