Hello,
I use this code to receive commands from PC to perform tasks i.e set date and time @115200. The problem is when trying to receive 106 bytes of data, i get buffer length error. on the other hand the code runs very well with smaller packets (12 bytes).
I tried to reduce baud rate to 9600 and also reduce bytes received to 75, but i still get errors. Is there a max limit for send and receive serial data? and how to handle this?
the problem in this code:
here is the whole sub:
I use this code to receive commands from PC to perform tasks i.e set date and time @115200. The problem is when trying to receive 106 bytes of data, i get buffer length error. on the other hand the code runs very well with smaller packets (12 bytes).
I tried to reduce baud rate to 9600 and also reduce bytes received to 75, but i still get errors. Is there a max limit for send and receive serial data? and how to handle this?
the problem in this code:
B4X:
Case REG_USER_DATA
If ReadWrite = RW_WRITE Then
Dim AccountArray (101) As Byte
Dim RAF As RandomAccessFile
RAF.Initialize(AccountArray,False)
RAF.WriteBytes(Buffer,4,101,0)
Log(AccountArray) 'for test only
Else
End If
End Selecthere is the whole sub:
B4X:
private Sub ReadPCstream(Buffer() As Byte)
'PC message frame should look like this(sent from PC)
'0x02 start byte
'RW read write byte, read = 1 , write - 0
'REG Register ID byte
'LN frame length byte, whole message length
'MSG message bytes
'0x04 end of transmission byte
'a hello world message, 0x02 0x00 0x00 0x10 Hello World 0x04, write hello world to register 0x00
Private const REG_USER_DATA As Byte = 0x00
Private const REG_DATE_TIME As Byte = 0x01
Private Const REG_LCD_BACKLIGHT_LEVEL As Byte = 0x02
Private Const REG_LCD_DARKNESS_LEVEL As Byte = 0x03
Private const REG_BATTERY_VOLTAGE As Byte = 0x04
Private CONST REG_SHIFT As Byte = 0x05
Private CONST REG_REASON As Byte = 0x06
Private const REG_LOAD As Byte = 0x07
Private const RW_READ As Byte = 1
Private const RW_WRITE As Byte = 0
If readRFIDbusy = True Or PCbusy = True Then
Return
End If
IndicateAll(False,False,False)
PCbusy = True
IndicateBusy(True)
StartDisplayTimeout
Dim BufferLength As Byte = Buffer.Length
Dim RegisterAddress As Byte
If BufferLength < 5 Then
PCbusy = False
IndicateBusy (False)
Return
End If
Dim BufferHeader As Byte = Buffer(0)
Dim ReadWrite As Byte = Buffer(1) 'read = 1 write = 0
If ReadWrite > 1 Then ReadWrite = 1
Dim RegisterID As Byte = Buffer(2) 'register id, i.e. register 0x01 = date time register
Dim FrameLength As Byte = Buffer(3) 'length of frame
Dim BufferEndofTransmission As Byte = Buffer(BufferLength - 1)
If FrameLength <> BufferLength Then
SendPCMessage("E01")
Log(FrameLength,"-",BufferLength)
BeepLong
PCbusy = False
IndicateBusy (False)
Return
Else
End If
If BufferHeader <> 0x02 Then 'start of transmission charachter
SendPCMessage("E02")
BeepLong
PCbusy = False
IndicateBusy (False)
Return
Else
End If
If BufferEndofTransmission <> 0x04 Then 'end of transmission character
SendPCMessage("E04")
BeepLong
PCbusy = False
IndicateBusy (False)
Return
Else
End If
'************************************************************************************************************
'************************************************************************************************************
'************************************************************************************************************
'write date time register looks like this
'0x02 0x00 0x01 0x0C 16 10 27 02 14 40 22 0x04 'write 2016/10/27 Sunday 14:40:22 to date time register
'this packet sent from proton basic serial terminal #2#0#1#12#16#10#27#01#14#52#15#4
Select RegisterID
Case REG_DATE_TIME
If ReadWrite = RW_WRITE Then
SetRTCTime(Buffer(4) + 2000,Buffer(5),Buffer(6),Buffer(7),Buffer(8),Buffer(9),Buffer(10))
Else
Log(0x02,RW_WRITE,REG_DATE_TIME,0x0C,Years - 2000,Months,DayOfMonth,DayOfWeek,Hours,Minutes,Seconds,0x04)
End If
Case REG_LCD_BACKLIGHT_LEVEL
If ReadWrite = RW_WRITE Then
BackLightLevel = Buffer(4)
SetBacklightLevel(BackLightLevel)
Else
Log(0x02,RW_WRITE,REG_LCD_BACKLIGHT_LEVEL,BackLightLevel ,0x06,0x04)
End If
Case REG_LCD_DARKNESS_LEVEL
If ReadWrite = RW_WRITE Then
ContrastLevel = Buffer(4)
SetContrast(ContrastLevel)
Else
Log(0x02,RW_WRITE,REG_LCD_DARKNESS_LEVEL,ContrastLevel,0x06,0x04)
End If
Case REG_BATTERY_VOLTAGE
If ReadWrite = RW_READ Then
GetBatteryInfo
Log(0x02,RW_WRITE,REG_BATTERY_VOLTAGE,BatVolts,0x06,0x04)
End If
Case REG_USER_DATA
If ReadWrite = RW_WRITE Then
Dim AccountArray (101) As Byte
Dim RAF As RandomAccessFile
RAF.Initialize(AccountArray,False)
RAF.WriteBytes(Buffer,4,101,0)
Log(AccountArray) 'for test only
Else
End If
End Select
BeepShort
PCbusy = False
IndicateBusy (False)
End Sub
