LPC MicrocontrollersのトピックRe: How to interface RS485 with LPC1769?

How to interface RS485 with LPC1769?

vishakhadakhane — Fri, 01 Nov 2019 04:30:16 GMT

Hello , I have interfaced Rs232 with lpc1769 using LPCopen's periph_uart_rb example. I am using MCUxpresso. I am able to print the data serially on Docklight. But now would like to interface Rs485 with LPC1769, Is there any example available in LPCopen or can we do it with periph_uart_rb? If yes then what changes am I supposed to make in periph_uart_rb? please let me know Thanks.

Re: How to interface RS485 with LPC1769?

Omar_Anguiano — Tue, 05 Nov 2019 19:02:43 GMT

Hello Vishakha Dakhane

You have to enable the direction control in the RS485 control register. Then configure the corresponding pin for UART direction control function and connect to the RS485 transceiver.

That's all for RS485. The rest is just normal UART operation.

Please refer to chapter 15 "LPC176x/5x UART1" of LPC176x/5x User Manual to find the register description.

https://www.nxp.com/docs/en/user-guide/UM10360.pdf

Also you can find a reference code in this community post

https://community.nxp.com/thread/455827

Let me know if this is helpful.

Best regards,

Omar

Re: How to interface RS485 with LPC1769?

vishakhadakhane — Wed, 06 Nov 2019 06:08:55 GMT

Hello @Omar Anguiano

Thanks for your reply! It worked