HardwareSerial setTxInvert does not change the idle state on STM32G4xx

[0x0fe]

So apparently setTxInvert does not change the idle state on STM32G4xx, (tested on G473VET6).
I would expect the idle stat to be low when setTxInvert is enabled. Is there another bit to change the idle state?

without setTxInvert

with setTxInvert

The specific port i used is PD8 and the baudrate is 8M

[fpistm]

Hi @0x0fe
for such question, open first a discussion instead of an issue.
As far as I know no specific things are done except properly set the correct propeties:

    huart->AdvancedInit.AdvFeatureInit |= UART_ADVFEATURE_TXINVERT_INIT;
    huart->AdvancedInit.TxPinLevelInvert = UART_ADVFEATURE_TXINV_ENABLE;

The default state of the line is maybe linked to the default GPIO config:

Arduino_Core_STM32/variants/STM32G4xx/G473V(B-C-E)(H-T)_G474V(B-C-E)(H-T)_G483VE(H-T)_G484VE(H-T)/PeripheralPins.c

Line 321 in 4884119

{PD_8, USART3, STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLUP, GPIO_AF7_USART3)},

You can try to redefine it at sketch level replacing GPIO_PULLUP by GPIO_PULLDOWN or GPIO_NOPULL

PinMap PinMap_UART_TX[] = {
  {PD_8,       USART3,  STM_PIN_DATA(STM_MODE_AF_PP, GPIO_PULLDOWN, GPIO_AF7_USART3)},
  {NC,         NP,      0}
};