Hi, joan and cleverca22! Thank you for your reply.
The default baud rate for GPS is 4800 (not 9600).
I tried the GNSS sensor to send NMEA messages at the rate of 4800 baud. (By the way,
I can change the transmission rate.) And I also tried several reception rate on my RasPi.
But the behavior was the same as before.
if you set enable_uart=1 only then you should be using /dev/ttyS0
if you set `dtoverlay=disable-bt` + `enable_uart=1` or `dtoverlay=miniuart-bt` + `enable_uart=1`, then ttyAMA0 gets routed to the gpio header
As I stated in my original post, I set "enable_uart=1" + "dtoverlay=disable-bt". So it means
ttyAMA0 shall correctly got routed to GPIO header. Am I right?
How about the order of those statements. Is it OK to state "enable_uart=1" first, then