LPC MicrocontrollersのトピックRe: Does LPC812 have a half-duplex UART?

Does LPC812 have a half-duplex UART?

_Nathan — Wed, 24 Nov 2021 07:05:59 GMT

Hi All,

There is no information on the half-duplex serial port in the LPC800' manual？

Is there a solution for UART Tx and Rx with single pin ?

Re: Does LPC812 have a half-duplex UART?

xiangjun_rong — Wed, 24 Nov 2021 08:53:25 GMT

Hi, Li,

I think you can use a bus switch to implement the function.

I suppose that NXP does not have bus switch IC, you have to get from Third party.

For example, pls refer to the link for Bus Switch.

Digital Bus Switch Selection Guide (Rev. A)

You can connect the RX pin of USART of LPC812 to 1B2, connect TX of USART of LPC812 to 1B1, connect S to a GPIO pin of LPC812 so that you can control the selection, connect /OE to GND or another GPIO, whatever.

When the 1B2 is selected, you can receive data, when the 1B1 is selected, you can transmit usart data.

Hope it can help you

XiangJun Rong

Re: Does LPC812 have a half-duplex UART?

_Nathan — Wed, 24 Nov 2021 09:19:49 GMT

Hi XiangJun,

Thanks!

Can Switch matrix of LPC812 implement the function(On PIO0_0)?

When transmit data PIO0_0 assigned to UART_TXD, then PIO0_0 assigned to UART_RXD to receive data immediately.

Re: Does LPC812 have a half-duplex UART?

xiangjun_rong — Wed, 24 Nov 2021 09:31:59 GMT

Hi,

I think it is okay to use Switch matrix of LPC812 to implement the function.

XiangJun Rong