UARTx get free space in tx_buffer_size (uart_driver_install) (IDFGH-7348)

[imwhocodes]

New version of arduino-esp32 add function to set tx_buffer_size that is used by uart_driver_install

This add the ability to add arbitrary buffer that is then copied on TxFiFo of the UART when free

The problem now become that inside esp-idf there is no function to get free space left on the TX Buffer allocated internally by uart_driver_install(...)

Currently Arduino implementation check UART registers get free space left in TxFiFo, but of course the value stored in the register keep count only of the space free in TxFiFo and not the extra RAM allocated buffer by uart_driver_install(...)

Is possible to have a function similar to uart_get_buffered_data_len that return data pending for write? or space left maybe?

Or there is any other way to extract that information from esp-idf?

Thanks,
Luca

[imwhocodes]

Hi

Any hints on how to get that informations in other ways?

Thanks,
Luca

[AxelLin]

#3078

[ginkgm]

Hi @imwhocodes ,

Good idea, we will add this.

[imwhocodes]

Hi

Is there any ETA for this feature?
I thought you already have the used buffer qty somewhere internally to the API, is it only matter to expose a get function to the user side?

Thanks,
Luca