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====== Debugging the RS485/Raspi ======

{{::img_20161124_100617.jpg?nolink&800|}}

  * LED is glowing, "flashing" (getting dark shortly) every second, as the weather station sends data every second

{{:img_20161124_100600.jpg?nolink&800|}}

  * We've connected the logic analyzer after the sferalabs board. Data comes in, all fine.

{{::logic-analyzer.png?direct&1200|}}

...and can be decoded.

===== However, =====

When I connect to it, it shows no data.

<code>screen /dev/ttyAMA0 19200</code>

//(baud rate taken from the data sheet)//

Bluetooth is disabled:

<code>
$ cat /etc/modprobe.d/raspi-blacklist.conf
blacklist btbcm
blacklist hci_uart
</code>

Raspberry Pi, model 3 B

<code>
uname -a
Linux raspberrypi 4.4.9-v7+ #884 SMP Fri May 6 17:28:59 BST 2016 armv7l GNU/Linux
</code>

Weather station is the basic Elsner P03 without modbus.

===== Update 24. Nov 16, 14:15 =====

> Can you please add this to /boot/config.txt
> <code>dtoverlay=pi3-disable-bt</code>
> Also, from the command line:
> <code>sudo systemctl disable hciuart</code>
> then reboot and try again?

Didn't work. Yet.

But I stumbled upon this:

<code>
$ cat /boot/config.txt
enable_uart=0
</code>

Setting this to enable_uart=1 did the trick.

{{::p03-rs485.gif?nolink|}}

WOOHOO! \o/