sdcardtest.py

   1 import machine
   2 import sdcard
   3 import uos
   4 import json
   5
   6 mytestdata = {
   7                 "health":11,
   8                 "happiness":1,
   9                 "energy":1
  10             }
  11
  12 # Create a file and write something to it
  13 #with open("/sd/test01.txt", "w") as file:
  14 #    file.write(json.dumps(mytestdata))
  15
  16 # Open the file we just created and read from it
  17 #with open("/sd/test01.txt", "r") as file:
  18 #    data = file.read()
  19 #    print(data)
  20 #    varx =json.loads(data)
  21 #    print(varx["health"])
  22
  23 class SaveGameManager:
  24     __SaveGameData = {}
  25     __FileSocket = None
  26     __cs = None
  27     __spi = None
  28     __sd = None
  29
  30     def __init__(self, savename="01"):
  31         print("initializing")
  32         try:
  33             # Assign chip select (CS) pin (and start it high)
  34             self.__cs = machine.Pin(9, machine.Pin.OUT)
  35
  36             # Intialize SPI peripheral (start with 1 MHz)
  37             self.__spi = machine.SPI(1,
  38                               baudrate=1000000,
  39                               polarity=0,
  40                               phase=0,
  41                               bits=8,
  42                               firstbit=machine.SPI.MSB,
  43                               sck=machine.Pin(10),
  44                               mosi=machine.Pin(11),
  45                               miso=machine.Pin(8))
  46
  47             # Initialize SD card
  48             self.__sd = sdcard.SDCard(self.__spi, self.__cs)
  49
  50             # Mount filesystem
  51             self.__FileSocket = uos.VfsFat(self.__sd)
  52             uos.mount(self.__FileSocket, "/sd")
  53
  54             #load values from FS
  55             self.LoadSaveData()
  56         except:
  57             pass
  58
  59
  60
  61     @property
  62     def CheckFilesystemReady(self):
  63         if self.__FileSocket is None:
  64             print("No FileSocket")
  65             return False
  66         return True
  67
  68     def LoadSaveData(self):
  69         print("loading")
  70         # Open the file we just created and read from it
  71         if not self.CheckFilesystemReady:
  72             return # If we have no filesystem we cannot write or read anyways...
  73
  74         with open("/sd/test00.txt", "rb") as file:
  75             file.read(1)        #ignore first byte, it containes the version number as binary... later :)
  76             data = file.read()
  77             self.__SaveGameData = json.loads(data)
  78
  79     def WriteSaveData(self):
  80         if not self.CheckFilesystemReady:
  81             pass # If we have no filesystem we cannot write or read anyways...
  82         # Create a file and write something to it
  83         with open("/sd/test01.txt", "wb") as file:
  84             file.write("0")
  85             file.write(json.dumps(self.__SaveGameData))
  86
  87     def UpdateData(self, key, value):
  88         print("updating internal data")
  89         self.__SaveGameData[key]=value
  90
  91     def GetData(self, key, defaultvalue=""):
  92         print("getting internaldata")
  93         if key in self.__SaveGameData:
  94             return self.__SaveGameData
  95         return defaultvalue
  96
  97
  98 mysavegame = SaveGameManager()
  99 mysavegame.UpdateData("bla","blub")
 100 mysavegame.WriteSaveData()
 101 mysavegame.LoadSaveData()
 102 print(mysavegame.GetData("bla"))
 103 print("x:"+mysavegame.GetData("something"))
 104 print("x:"+mysavegame.GetData("something","defaultthing"))