Diff: mmPython/mmUSBserial.txt

Revision:

0:8e898e1270d6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mmPython/mmUSBserial.txt	Tue Sep 17 19:42:49 2013 +0000
@@ -0,0 +1,94 @@
+#!/usr/bin/python -tt                           # tt: detect mixed space/tab.
+#---copyright-----------------------------------#-------------------------------
+#   licensed for personal and academic use.
+#   commercial use must be approved by the account-holder of
+#   gated.clock@gmail.com
+#-------imports---------------------------------#-------------------------------
+import serial                                   # serial over USB.
+#=======class===================================#===============================
+if (1):
+        class mmUSBserial():                    # USB class.
+#-----------------------------------------------#-------------------------------
+                                                # constructor.
+          def __init__(self, idVendor, idProduct):      
+
+            self.__idVendor  = idVendor         # promote to object scope.
+            self.__idProduct = idProduct        # promote to object scope.
+
+            openSuccess = 1
+            self.__serialPort = serial.Serial()
+            self.__serialPort.baudrate = 115200 # was 9600
+            self.__serialPort.timeout  =    1   # one-second timeout.
+
+            for portIndex in range(7, -1, -1):
+              portString = "/dev/ttyACM" + "{}".format(portIndex)
+              self.__serialPort.port = portString
+              try:
+                self.__serialPort.open()
+              except:
+                print("failed to open port {}.").format(portString)
+                openSuccess = 0
+
+              if (openSuccess): break
+              openSuccess = 1
+
+            if (openSuccess): print("successfully opened port {}.").format(portString)
+            else:             print("could not open any port.")
+
+            self.__SER_BYTES = 18               # same as mbed program's SER_BYTES.
+#-----------------------------------------------#-------------------------------  
+          def __del__(self):                    # destructor.
+            self.__serialPort.close()
+            print "object destroyed."
+#-----------------------------------------------#-------------------------------
+#         the number of bytes written and read must both be SER_BYTES.
+#         the '$' must be in bit<7> of what's written.
+
+          def write(self,toWrite):              # write a string.
+            nowWrite = toWrite[:7]
+            nowWrite = nowWrite + "$"           # in <7>.
+            if (self.__SER_BYTES > 8):          # flush out with 0's.
+              for loopIndex in range (0, self.__SER_BYTES - 8):
+                nowWrite = nowWrite + "0"
+#           print("nowWrite {}").format(nowWrite)
+            self.__serialPort.write(nowWrite)
+            return(nowWrite)
+#-----------------------------------------------#-------------------------------
+          def read(self):                       # read a string.
+            gotRead = self.__serialPort.read(self.__SER_BYTES)
+#           print("gotRead {}").format(gotRead)
+            return(gotRead)
+#-----------------------------------------------#-------------------------------
+#===============================================#===============================
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