IWR1642: How to config IWR1642's uart to half-duplex mode?

Wesley He

Part Number: IWR1642

Hi team,

Customer is using RS485 to communicate. RS485 is connected to UART IO port.

The issue is: because RS485 is working in half-duplex mode. So when IWR1642 transmit a data in UART_TX. IWR1642 will receive same data in UART_RX.

How to config UART in half-duplex mode? To disable UART_RX when sending data through UART_TX?

One more thing, because OOB demo is using sys/bios, so even customer add sleep 1ms when sending data, but the RX still can get the data.

Thanks.

Wesley

over 6 years ago

0 Wesley He over 6 years ago

TI__Expert 6205 points

Hi Team,

Due to the hardware limited(When TX a data, RX pin will get a same data). Customer need to set UART working in half-duplex mode in software. Could you please point out how to do that?

I had read the TRM and try to modify the UART driver, but it doesn't work.

Also, we can not disable RX pin GPIO function when transmitting data. Because when transmitting data, the data was putting in a buffer, we can not decide when to transmit it.

Thanks.
Wesley

0 JohnH over 6 years ago in reply to Wesley He

TI__Mastermind 21295 points

Hi Wesley,

Could you specify the changes you made to the driver that did not work?

Thanks,
John

0 JohnH over 6 years ago in reply to JohnH

TI__Mastermind 21295 points

Wesley,

I found the following similar thread which will hopefully point you and the customer in the right direction.
e2e.ti.com/.../472065

Regards,
John

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IWR1642: How to config IWR1642's uart to half-duplex mode?