Merge pull request #22 from 7west/master

A better example for UART on the Pico

Author: Alasdair Allan

uart/README.adoc

@@ -0,0 +1,25 @@
+= Using UART on the Raspberry Pi Pico
+:xrefstyle: short
+
+Send data from the UART1 port to the UART0 port. 
+
+== Other code to try
+[source.python]
+uart0 = UART(0) #opens a UART connection at the default baudrate of 115,200
+uart0.readline() #reads until the CR (\r) and NL (\n) characters then returns the line
+
+
+== Wiring information
+
+See <<uart-wiring-diagram>> for wiring instructions.
+
+[[uart-wiring-diagram]]
+[pdfwidth=75%]
+.Wiring two of the Pico's ports together. Be sure to wire UART0:TX to UART1:RX and UART0:RX to UART1:TX.
+image::pico_uart_example.png[]
+
+== List of Files
+
+A list of files with descriptions of their function;
+
+uart.py:: The example code.

uart/pico_uart_example.png

@@ -1,22 +1,15 @@
-from machine import UART, Pin
-from time import sleep_us
-
-class myUART(UART):
-    def readUntil(self, termination, maxlen=-1, includeTermination=True):
-        result = ''
-        while maxlen < 0 or len(result) < maxlen:
-            if self.any():
-                #print("here")
-                result += chr(self.read(1)[0])
-                #print(result)
-                if result.endswith(termination):
-                    if not includeTermination:
-                        result = result[:-len(termination)]
-                    break
-            sleep_us(10)
-        return result
-
-uart = myUART(0, baudrate=9600, tx=Pin(0), rx=Pin(1), bits=8, parity=None, stop=1)
-
-uart.write("AT+GMR\r\n")
-print(uart.readUntil('OK',maxlen=-1, includeTermination=True))
+from machine import UART, Pin
+import time
+
+uart1 = UART(1, baudrate=9600, tx=Pin(8), rx=Pin(9))
+
+uart0 = UART(0, baudrate=9600, tx=Pin(0), rx=Pin(1))
+
+txData = b'hello world\n\r'
+uart1.write(txData)
+time.sleep(0.1)
+rxData = bytes()
+while uart0.any() > 0:
+    rxData += uart0.read(1)
+
+print(rxData.decode('utf-8'))