Adding OrangePi Zero2 pin mappings (#64)

* Add pin mappings for Orange Pi Zero2

# Test code
for pin in BOARD.keys():
    print(f'Testing pin {pin}.')
    GPIO.output(pin, GPIO.HIGH)
    input("Continue.")
    GPIO.output(pin, GPIO.LOW)

* Version upgrade 0.5.2 -> 0.5.3

* Change log entry

CHANGES.rst

@@ -4,6 +4,8 @@ ChangeLog
 +------------+---------------------------------------------------------------------+------------+
 | Version    | Description                                                         | Date       |
 +============+=====================================================================+============+
+| **0.5.3**  | * Added OrangePi Zero2 pin mappings                                 | 2021/10/22 |
++------------+---------------------------------------------------------------------+------------+
 | **0.5.2**  | * Add full 40-pin header for Orange Pi 4(B)                         | 2021/10/22 |
 +------------+---------------------------------------------------------------------+------------+
 | **0.5.1**  | * Updated orange pi 4B mappings                                     | 2021/08/19 |

VERSION.txt

@@ -1 +1 @@
-0.5.2
+0.5.3

orangepi/zero2.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+# Copyright (c) 2022 sillo01
+# See LICENSE.md for details.
+
+"""
+Alternative pin mappings for Orange PI Zero2
+(see https://linux-sunxi.org/File:Orange_Pi_Zero2_H616_Schematic_v1.3.pdf)
+Usage:
+.. code:: python
+   import orangepi.zero2
+   from OPi import GPIO
+   GPIO.setmode(orangepi.zero2.BOARD)
+"""
+
+# pin number = (position of letter in alphabet - 1) * 32 + pin number
+# So, PD14 will be (4 - 1) * 32 + 14 = 110
+
+# Orange Pi Zero 2 physical board pin to GPIO pin
+BOARD = {
+    3:    229,   # PH5/I2C3_SDA
+    5:    228,   # PH4/I2C3_SCK
+    7:    73,    # PC9
+    8:    226,   # PH2/UART5_TX
+    10:   227,   # PH3/UART5_RX
+    11:   70,    # PC6
+    12:   75,    # PC11
+    13:   69,    # PC5
+    15:   72,    # PC8
+    16:   79,    # PC15
+    18:   78,    # PC14
+    19:   231,   # PH7,SPI1_MOSI
+    21:   232,   # PH8,SPI1_MISO
+    22:   71,    # PC7
+    23:   230,   # PH6,SPI1_CLK
+    24:   233,   # PH9,SPI1_CS
+    26:   74,    # PC10
+}
+
+# BCM mapping not identified yet, keeping it for compatibility
+BCM = BOARD