Hello to everyone ,

 

I'm trying to read NMEA messages from GPS receiver via UART .

But can't read anything on pins 8,10 & 38,40  .. 

What coulb be a reason ? GPS receiver is working fine , I can read it via USB-UART converter on the same board ...

Thanks in advance !

Here's my system (UARTs are enabled via armbian config utility): 

 

root@orangepiprime:/boot# cat armbianEnv.txt
verbosity=1
console=both
overlay_prefix=sun50i-h5
rootdev=UUID=aca8c4ac-41d0-4e0b-ae7e-1d727baa4d43
rootfstype=ext4
overlays=pps-gpio uart1 uart2 uart3

usbstoragequirks=0x2537:0x1066:u,0x2537:0x1068:u
root@orangepiprime:/boot# uname -a
Linux orangepiprime 4.14.70-sunxi64 #274 SMP Wed Sep 19 12:09:30 CEST 2018 aarch64 GNU/Linux
 

3 hours ago, dmitry_z said:

But can't read anything on pins 8,10 & 38,40  .. 

Pin 8,10 are not UART, although schematic labeled them wrongly.

Pin 38,40 are not UART too, they are PC11/PC12.

UART1 is dedicated on BT, so not breakout on header ...

 

Did you tried the UART2 on pin 11,13 ?

Did you tried the UART3 on pin 23,24 if you are not using SPI1 ?

Thank you so much, Martin !

UART2 is found on pins 11,13 indeed !

 

One more question:

is it right to define in armbianEnv.txt

 param_pps_pin=PA7 

 

and connect PPS wire to pin 29 ?

I mean no mismatch here ?