Hello everyone,
I have encountered a strange problem on the UART. When I am reading UART0 from linux using "cat /dev/ttyPS1" or a test app, strange singals will keep sending into the RX port of the UART, why??
Details:
I am using picozed 7015 with petalinux 16.2. UART1 is binding with the console which is functional. UART0 is binding to a GPS module through EMIO. RX and TX of UART0 are pulled up using vivado user constrain.
Using "cat /dev/ttyPS1", I can get continuous messages :
"$GNTXT,01,01,01,NMEA unknown msg*46
$GNTXT,01,01,01,NMEA unknown msg*46"
Suggesting that input cmd is wrong.
Then I use a multimeter to check the RX port when the "cat /dev/ttyPS1" is running, and the voltage of RX port is continuously change.
If I only send something to the RX port of UART1, the GPS module can recv my cmd.
Am I missing something ? I have googled but got nothing.. Thanks..
