what this usart error exactly mean?

[navidansari]

hi

i receive this error on lpc1768

ARM_USART_EVENT_RX_OVERFLOW

in api it says Receive data overflow

why should it overflow?everything is right on oscope

this usart connected to ADM485 that its output level is 5v and i maybe noise on input of ADM485 is leveled up and make this error happen?

[jeremyzhou · Accepted solution]

Hi navid ansari,

Thank you for your interest in NXP Semiconductor products and 

the opportunity to serve you.

I'd highly recommend you to refer the RS485 demo in the ~\lpc407x_8x_177x_8x\lpc407x_8x_177x_8x\Examples\UART after the library installed. The demo illustrate how to use RS485 functionality on UART of LPC1788 Develop Kit, and Fig 1 is the sch of the RS485 transceiver.

Fig 1

You can download the library via the link below.

lpc407x_8x_177x_8x.zip - Google Drive 

Have a great day,

TIC

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[navidansari]

thanks allot