STM32WLE5CCUX 48 pin package

[DavidG7]

I am trying to enable all 3 UARTS (LPUART, USART1 and USART2) within the STM IDE.

However, on choosing LPUART, USARTS2 become unavailable (and vice versa) .

Is this a device limitation?   We really would like to be able to use all 3 uarts (no flow control necessary)

[Andrew Neil]

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@DavidG7 wrote:

Is this a device limitation ?   

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You need to look at the device Datasheet and Reference Manual: they will show you all the available Alternate Function pin allocations - see if any of them works to get access to all 3 UARTs ...

[STTwo-32 · Accepted solution]

Hello @DavidG7 and welcome to the ST Community 😊.

The STM32WLE5CCUX 48 pin package use the same two Pins (PA2 & PA3) for the TX and RX of the LPUART1 and USART2. So, you can't use them one the same time. 

Best Regards.

STTwo-32

[Andrew Neil]

According to the datasheet, they both support single-wire half-duplex:

@DavidG7  - Maybe if you do that, one could use each pin ... ?

🤔

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[STTwo-32]

@Andrew Neil 

On the one wire (Half-duplex) mode, both need to enable the TX pin. this pin is the same for both of them (PA2).

Best regards.

STTwo-32

[DavidG7]

Thanks for your prompt reply.

Strange decision to make by STM to share the pins on such an important peripheral.

But thanks , appreciate you prompt reply

[Andrew Neil]

That's always the tradeoff for so much microcontroller in a low pin-count package !