Add UART entries for the PocketBeagle (issue #242)

PocketBeagle pins with UART pin mode:

  P1_30 uart0_txd
  P1_32 uart0_rxd
  P2_11 uart1_rxd
  P2_09 uart1_txd
  P1_08 uart2_rxd
  P1_10 uart2_txd
  P2_29 uart3_txd

Available UART names on PocketBeagle:

 PB-UART0: /dev/ttyO0, Rx: P1_30, Tx: P1_32
 PB-UART1: /dev/ttyO1, Rx: P2_11, Tx: P2_09
 PB-UART2: /dev/ttyO2, Rx: P1_08, Tx: P1_10
 PB-UART3: /dev/ttyO3, Rx: P2_29, Tx: none

Signed-off-by: Drew Fustini <drew@pdp7.com>

Author: pdp7

README.md

@@ -206,6 +206,17 @@ if ser.isOpen():
     ser.write("Hello World!")
 ser.close()
 ```
+* Available UART names on BeagleBone
+  * `UART1`: /dev/ttyO1, Rx: P9_26, Tx: P9_24
+  * `UART2`: /dev/ttyO2, Rx: P9_22, Tx: P9_21
+  * `UART3`: /dev/ttyO3, Rx: P9_42, Tx: none
+  * `UART4`: /dev/ttyO4, Rx: P9_11, Tx: P9_13
+  * `UART5`: /dev/ttyO5, Rx: P8_38, Tx: P8_37
+  * note: `UART5` requires `disable_uboot_overlay_video=1` in `/boot/uEnv.txt`
+* Available UART names on PocketBeagle
+  * `PB-UART0`: /dev/ttyO0, Rx: P1_30, Tx: P1_32
+  * `PB-UART1`: /dev/ttyO1, Rx: P2_11, Tx: P2_09
+  * `PB-UART2`: /dev/ttyO2, Rx: P1_08, Tx: P1_10
 * [Loopback test with UART1 and UART2](https://learn.adafruit.com/setting-up-io-python-library-on-beaglebone-black/uart#testing-and-using-the-uart)
 
 

source/common.c

@@ -263,12 +263,24 @@ pins_t table[] = {
   { NULL, NULL, 0, 0, 0 }
 };
 
+// Issue #243: UART setup not working for pocket beagle pins
+// Add UART entries for the PocketBeagle:
+//   P1_30 uart0_txd
+//   P1_32 uart0_rxd
+//   P2_11 uart1_rxd
+//   P2_09 uart1_txd
+//   P1_08 uart2_rxd
+//   P1_10 uart2_txd
+
 uart_t uart_table[] = {
   { "UART1", "/dev/ttyO1", "ADAFRUIT-UART1", "P9_26", "P9_24"},
   { "UART2", "/dev/ttyO2", "ADAFRUIT-UART2", "P9_22", "P9_21"},
   { "UART3", "/dev/ttyO3", "ADAFRUIT-UART3", "P9_42", ""},
   { "UART4", "/dev/ttyO4", "ADAFRUIT-UART4", "P9_11", "P9_13"},
   { "UART5", "/dev/ttyO5", "ADAFRUIT-UART5", "P8_38", "P8_37"},
+  { "PB-UART0", "/dev/ttyO0", "ADAFRUIT-UART0", "P1_30", "P1_32"},
+  { "PB-UART1", "/dev/ttyO1", "ADAFRUIT-UART1", "P2_11", "P2_09"},
+  { "PB-UART2", "/dev/ttyO2", "ADAFRUIT-UART2", "P1_08", "P1_10"},
   { NULL, NULL, 0, 0, 0 }
 };
 

test/test_uart.py

@@ -1,4 +1,5 @@
 import pytest
+import serial
 import platform
 
 import Adafruit_BBIO.UART as UART
@@ -11,7 +12,7 @@ def teardown_module(module):
     # ADC.cleanup()
 
 
-class TestAdc: 
+class TestUart:
     def test_setup_uart_wrong_name(self):
         if kernel >= '4.1.0':
             pass
@@ -25,9 +26,39 @@ def test_setup_adc(self):
         else:
             UART.setup("UART1")
 
-    def test_setup_adc_multiple(self):
+    def test_setup_uart_multiple(self):
         if kernel >= '4.1.0':
             pass
         else:
             UART.setup("UART1")
             UART.setup("UART1")
+
+    # test UART entries for the PocketBeagle (issue #243)
+    def test_pocketbeagle(self):
+        if kernel < '4.1.0':
+            pass
+        value = open('/proc/device-tree/model').read()
+        if(value.startswith("TI AM335x PocketBeagle")):
+          uarts = {
+            'PB-UART0': '/dev/ttyO0',
+            'PB-UART1': '/dev/ttyO1',
+            'PB-UART2': '/dev/ttyO2',
+          }
+        else:
+          uarts = {
+            'UART1': '/dev/ttyO1',
+            'UART2': '/dev/ttyO2',
+            'UART4': '/dev/ttyO4'
+            # note: UART5 requires
+            # "disable_uboot_overlay_video=1" in /boot/uEnv.txt
+            #'UART5': '/dev/ttyO5'
+          }
+
+        for name, device in sorted(uarts.items()):
+          UART.setup(name)
+          uart = serial.Serial(port = device, baudrate=9600)
+          uart.close()
+          uart.open()
+          if uart.isOpen():
+            uart.write("hello world".encode("utf-8"))
+          uart.close()