Added Cananka board.

draft/overlay/medo64-cananka.md

@@ -0,0 +1,50 @@
+<!--
+---
+name: Cananka
+class: board
+type: other
+formfactor: HAT
+manufacturer: Josip Medved
+description: Cananka is Raspberry Pi HAT allowing for CAN bus communication.
+url: https://medo64.com/cananka/
+github: https://github.com/medo64/cananka/
+image: 'cananka.png'
+pincount: 40
+eeprom: yes
+power:
+  '1':
+  '2':
+  '4':
+  '17':
+ground:
+  '6':
+  '9':
+  '14':
+  '20':
+  '25':
+  '30':
+  '34':
+  '39':
+pin:
+  '19':
+    mode: spi
+  '21':
+    mode: spi
+  '22':
+    name: Interrupt
+    mode: input
+    active: low
+  '23':
+    mode: spi
+  '24':
+    mode: spi
+-->
+# Cananka
+
+Cananka is Raspberry Pi HAT allowing for CAN bus communication.
+
+Features include up to 1Mbit/s bus speed (125 kbit/s default); fully isolated
+(1 kV); does not require CAN bus power supply (onboard DC-to-DC converter);
+supports powering Raspberry Pi from CAN bus (up to 24 V, 2 A); automatic
+detection via HAT specification; works on Raspberry Pi B+ and above (including
+Pi Zero).