UART RX_ERROR Flag is setting in LPC54608 EVAL board with GPS.

Malesh — Mon, 30 Aug 2021 11:16:41 GMT

Greetings,

This is Malesh. I am using LPC54608 Eval board. i am just interfaced the GPS LEA_6s to the Flex Comm9 with baudrate 9600. Enabled only the RX with FIFO operation. I am getting the GPS data , observed on DSO(digital scope). when i am connected GPS to the board, RX_BUFF_NOT_EMPTY Flag not setting. But I am getting RX_ERROR Flag and FRAME ERR flag.

Please Help me Regarding this.

Software used is MPUXpresso ver 11.2.1.

Installed the LPC54608 board SDK.

Dumped the example code UART_polling.

Note: I am changed the Flexcomm0 to Flexcomm9.

configuration:

8 bit data.

1 stop bit.

parity disabled.

Regards,

Malesh

Re: UART RX_ERROR Flag is setting in LPC54608 EVAL board with GPS.

frank_m — Mon, 30 Aug 2021 12:17:22 GMT

The user manual says:

Framing Error interrupt flag. This flag is set when a character is received with a missing stop bit at the expected location. This could be an indication of a baud rate or configuration mismatch with the transmitting source.

So, check with the datasheet of your GPS receiver if your settings are correct.

If in doubt, transmit a character within your code, and check the output & timing on the Tx pin with scope.

> Note: I am changed the Flexcomm0 to Flexcomm9.

Perhaps try on the orignal interface (flexcomm0), short of posting the relevant code here.

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UART RX_ERROR Flag is setting in LPC54608 EVAL board with GPS.

Re: UART RX_ERROR Flag is setting in LPC54608 EVAL board with GPS.