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I2C_serial.py

+'''
+I2C Class
+
+'''
+import sys
+sys.path.insert(0,'c:\python34\lib\site-packages')
+import serial
+from time import * 
+
+DEBUG=False
+
+ser = serial.Serial()
+ser.baudrate = 57600
+ser.port = 'COM11'
+ser.parity = serial.PARITY_NONE
+ser.timeout = 1
+
+class I2C:
+
+    def __init__(self, ADDRESS='040'):
+        self.I2C_Address = ADDRESS
+
+
+#    def chk_ack(self):
+#        return ret_ack
+#    def write_bytes(self,register,data):
+#        return ret_ack
+#    def write_last_reg(self,data):
+#        return ret_ack
+        
+    def read_bytes(self, register, bytes_to_read=2):
+        serial_string='S{0:x}{1:{fill}2x}PS{2:x}{3:02}45P'.format(self.I2C_Address*2, register, (self.I2C_Address*2+1), bytes_to_read, fill = '0')
+        serial_string=serial_string.upper()
+        ret_ack = 1
+        if DEBUG:
+            print(serial_string)
+            ret_value="0F"
+        else:
+            ser.open()
+            ser.write(bytes(serial_string, 'utf-8'))
+            ret_value = ser.read(bytes_to_read*2) 
+            ser.close()
+            ret_value = ret_value.decode("utf-8") 
+        return ret_ack, ret_value
+
+    
+    def read_last_reg(self, bytes_to_read):
+        serial_string='S{0:x}{1:02}P'.format((self.I2C_Address*2+1), bytes_to_read)
+        serial_string=serial_string.upper()
+        ret_ack = 1
+        if DEBUG:
+            print(serial_string)
+            ret_value="0F"
+        else:
+            ser.open()
+            ser.write(bytes(serial_string, 'utf-8'))
+            ret_value = ser.read(bytes_to_read*2) 
+            ser.close()
+            ret_value = ret_value.decode("utf-8") 
+        return ret_ack,ret_value
+  
+    def write_bytes(self, register, data):
+        ret_value=[]
+        serial_string='S{0:x}{1:02x}{2:02x}P'.format(self.I2C_Address*2, register, data)
+        serial_string=serial_string.upper()
+        ret_ack = 1
+        if DEBUG:
+            print(serial_string)
+        else:
+            ser.open()
+            ser.write(bytes(serial_string, 'utf-8'))
+            ser.close()
+        return ret_ack
+
+    def write_pointer(self, register):
+        ret_value=[]
+        serial_string='S{0:x}{1:02x}P'.format(self.I2C_Address*2, register)
+        serial_string=serial_string.upper()
+        ret_ack = 1
+        if DEBUG:
+            print(serial_string)
+        else:
+            ser.open()
+            ser.write(bytes(serial_string, 'utf-8'))
+            ser.close()
+        return ret_ack
+
+if __name__ == "__main__":
+    I2C_Device = I2C(0x40)
+    I2C_Device.write_bytes(0x00, 0x00)
+    ret_ack, ret_value = I2C_Device.read_bytes(0x8C, 2)
+    print(ret_value)