On Sun, Jul 28, 2019 at 07:37:26PM -0500, hal wrote: > On 7/28/19 3:57 PM, hal wrote: > <snip> > > > > Some searching says to add "core_freq=250" or "enable_uart=1" but > > so far still nothing. Any suggestions are appreciated. > > I got the serial port working. It's a bit of a task. Apparently the > bluetooth integration messed up the serial port configuration so > when you boot, you're actually connected to the bluetooth chip > on /dev/ttyAMA0. You have to fiddle with /boot/config.txt and > /boot/cmdline.txt to restore the serial functionality.
Nice to hear that you got it working! As you mention, I remind that there was something :-) Some time ago, I was going to use the serial port with an LTE shield. I remind I also had to fiddle with it to get it working. Actually, RPi 3 B+ has two UARTs. The usual/default UART is connected with Bluetooth chip by default, thus the Pins on the header are not working - as you already found out. If you want to use Bluetooth and UART: There is another UART in RPi 3 B+ which can be mapped to Bluetooth instead. you could be using core_freq=250 dtoverlay=pi3-miniuart-bt instead of dtoverlay=pi3-disable-bt This additional uart does not support full speed / handshake but fast enough for bluetooth in any case. I think it only works with fixed clock freq. cheers, Andreas
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