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SP RAM help

AlonzoAlonzo Posts: 3
edited 2005-08-04 14:55 in BASIC Stamp
I have the following data in SP RAM.
·
Data········· Slot
1····························· 0
2····························· 1
3····························· 2
4····························· 3
·
·
How do I retrieve the data and put the data into a single variable as a decimal number of 1234?

Comments

  • YanroyYanroy Posts: 96
    edited 2005-08-03 18:51
    I'm sure I'm just not up on my lingo or I'm suffering from momentary amnesia, but I can't remember what SP stands for... I'm going to assume you can put those numbers into standard byte variables (or maybe they already are?) named DataByte0 through DataByte3.

    single_variable = (DataByte0 * 1000) + (DataByte1 * 100) + (DataByte2 * 10) + DataByte3

    Make sure single_variable is a word!· Also, if you wanted it as a 4-byte string with the ASCII values (I'm not quite sure what you want), just add $30 to each of the bytes (that's the ASCII '0' character offset).
  • allanlane5allanlane5 Posts: 3,815
    edited 2005-08-03 19:03
    "SP" == ScratchPad, as in ScratchPad RAM, as in a resource only available on the 'p' model BS2's.

    Otherwise, the solution is quite good as posted.
  • AlonzoAlonzo Posts: 3
    edited 2005-08-03 20:32
    How do I put the data into the SP RAM and then
    'extract the data as variables, see the code and question below:

    ' {$STAMP BS2p}
    ' {$PBASIC 2.5}
    '
    '**********************************************************************************************************************
    'Constants

    SD_Data_OUT······ CON··· 0················ 'Serial data TO SD Module
    SD_Data_IN······· CON··· 1················ 'Serial data FROM SD Module
    Right_OE········· CON··· 5················ 'Right motor enable, HIGH turns motor OFF, LOW enables motor
    Left_OE·········· CON··· 6················ 'Left motor enable, HIGH turns motor OFF, LOW enables motor
    SD_Fpin·········· CON··· 7················ 'Fpin for MMC/SD Module
    LCD·············· CON··· 8················ 'Serial LCD Data
    DAC_LOAD········· CON··· 9················ 'CS
    DAC_DATA········· CON··· 11··············· 'Digital to Analog Data line, Data is shifted in on the falling edge
    DAC_CLK·········· CON··· 10··············· 'Digital to Analog Clock line, Data is shifted in on the falling edge
    MSB_FIRST········ CON··· 1················ 'MSB First
    LSB_FIRST········ CON··· 0················ 'LSB First
    ADC_CS··········· CON··· 12··············· 'Analog to Digital Chip Select line, A LOW enables the ADC
    ADC_Din·········· CON··· 13··············· 'Analog to Digital Data Into AD Convertor, load channel configuration data into the ADC
    ADC_Dout········· CON··· 14··············· 'Analog to Digital Data Out of AD Convertor, data changes on falling edge of clock
    ADC_CLK·········· CON··· 15··············· 'Analog to Digital Clock line
    N9600············ CON··· $40F0············ 'Use with BS2-SX for BPI-216 2x16 LCD display
    I················ CON··· 254·············· 'Instruction prefix value for BPI-216 2x16 LCD display
    CLR·············· CON··· 1················ 'Clear Screen command for the LCD
    Right_Motor······ CON··· 15
    Left_Motor······· CON··· 7

    ADC_Right_Press·· CON··· 24··············· 'CH0 of ADC
    ADC_Right_Flow··· CON··· 25··············· 'CH1 of ADC
    ADC_Left_Press··· CON··· 26··············· 'CH2 of ADC
    ADC_Left_Flow···· CON··· 27··············· 'CH3 of ADC
    BaudMode········· CON··· 240·············· '8 bit no parity true for BS2-sx and BS2-p

    '**********************************************************************************************************************
    'Variables
    Left_Flow········ VAR······ Word
    Right_Flow······· VAR······ Word
    Rx_Pressure······ VAR······ Word
    Left_Pressure···· VAR······ Word
    Right_Pressure··· VAR······ Word
    Status··········· VAR······ Nib
    Burdened_Delta··· VAR······ Nib
    Bilevel_Mode····· VAR······ Bit··············· '0 = OFF, 1 = ON
    x················ VAR······ Word
    y················ VAR······ Byte
    ·'FC··········· CON···· $89

    PAUSE 500
    Rx_Pressure = 1311
    Burdened_Delta = 6
    Bilevel_Mode = 1


    'FW = File Write, Open the SD Card AND WRITE a file name TO it
    DEBUG "....................",CR
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"FW ","PatData.txt",CR]
    SERIN SD_Data_IN,240,[noparse][[/noparse]STR x \2]
    DEBUG "File write: ",STR x \2, CR
    PAUSE 200

    'PL = Put Line, put a line of data on the SD card
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"PL ","1234","5","6","78901","23456","78901","\r",CR]
    SERIN SD_Data_IN,240,[noparse][[/noparse]STR x \2]
    DEBUG "Line wrote: ",STR x \2, CR
    PAUSE 500

    'FC = File Closed, close the file
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"FC",CR ]
    SERIN SD_Data_IN,240,[noparse][[/noparse]STR x \2]
    DEBUG "File closed:",STR x \2, CR
    PAUSE 200

    'FR = File Read, read the PatData.txt file
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"FR ","PatData.txt",CR ]
    SERIN SD_Data_IN,240,[noparse][[/noparse]STR x \2]
    DEBUG "Read Status:",STR x \2, CR
    PAUSE 200

    'GL = Get Line, get the line of data that was written
    'on the SD card above
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"GL",CR]
    SERIN SD_Data_IN,240,10000,No_Data,[noparse][[/noparse]SPSTR 21]
    PAUSE 200

    'display the data on the debug screen
    FOR y = 0 TO 20
    GET y , Rx_Pressure
    DEBUG "Data: ",Rx_Pressure,CR
    NEXT

    'Question:· At this point of the code, how do I put the data into the SP RAM and then
    'extract the data as variables.· The variable sizes are
    'separated by quotes as indicated in the PL command above?
    'x = (DataByte0 * 1000) + (DataByte1 * 100) + (DataByte2 * 10) + DataByte3


    'FS = File Size, indicate the size of the PatData.txt file
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"FS ","PatData.txt",CR ]
    SERIN SD_Data_IN,240,[noparse][[/noparse]STR x \2]
    DEBUG "File size:· ",STR x \2, CR
    PAUSE 200

    GOTO Close_File

    No_Data:
    DEBUG "****************",CR
    DEBUG "Time-out Error",CR
    DEBUG "****************",CR
    PAUSE 200

    'FC = File Closed, close the file
    Close_File:
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"FC",CR]
    SERIN SD_Data_IN,240,2000,Not_Closed,[noparse][[/noparse]STR x \2]
    DEBUG "File closed:",STR x \2, CR
    GOTO Completed

    Not_Closed:
    DEBUG "File may not have closed"

    Completed:
    DEBUG "....................",CR,CR


    END



    Many thanks!
  • allanlane5allanlane5 Posts: 3,815
    edited 2005-08-03 20:37
    You use the "GET" and "PUT" keywords to get stuff out of the SP RAM, and put stuff into the SP RAM. Knowing the keywords, you can now look it up in the manual, where it's explained MUCH better than I can.
  • NewzedNewzed Posts: 2,503
    edited 2005-08-03 21:04
    Alonzo, here is a snippet of code from my RFID reader program:

    LOW Enable··································· ' activate the reader
    Alonzo, here is a snippet of code from my RFID program:

    SERIN RX, baud1, [noparse][[/noparse]WAIT($0A),· SPSTR 10]·······HIGH enable
    GOTO Display_Tag

    Display_Tag:

    · GET 0, a
    · GET 1, b
    · GET 2, c
    · GET 3, d
    · GET 4, e
    · GET 5, f
    · GET 6, g
    · GET 7, h
    · GET 8, i
    · GET 9, j
    · DEBUG "Tag number is : ",· a, b, c, d, e, f, g, h, i, j, "· ",·· asc ? Device, cr, cr

    The address read with GET and the data stored in a, b, c, etc.

    I'm not sure but you could probably use the WORD modifier if you wanted to store something larger than a byte.· If you do use WORD, remember that WORD will take two bytes of storage space.

    The SPRAM has 164 bytes of storage.



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    Sid Weaver
    Do you have a Stamp Tester yet?
    http://hometown.aol.com/newzed/index.html

    ·
  • Jon WilliamsJon Williams Posts: 6,491
    edited 2005-08-03 21:08
    Word does indeed work with PUT and GET. Values are stored as two bytes, little-endian (low byte first).

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    Jon Williams
    Applications Engineer, Parallax
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-08-03 21:56
    Newzed said...(trimmed)

    The SPRAM has 164 bytes of storage.

    Sid,

    ·· Actually there are 128 bytes available.· =)

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • Tracy AllenTracy Allen Posts: 6,658
    edited 2005-08-04 07:08
    Chris, make it 127, as bytes from 0 to 126 are avaiable for both GET and PUT. Byte 127 is read only, the current status of the RUN and STORE slots. Bytes 129 to 135 are also all read only, internal status of the polling operations.

    Alonzo,
    Alonzo said...
    'PL = Put Line, put a line of data on the SD card
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"PL ","1234","5","6","78901","23456","78901","\r",CR]

    SERIN SD_Data_IN,240,10000,No_Data,[noparse][[/noparse]SPSTR 21]

    'Question: At this point of the code, how do I put the data into the SP RAM and then
    'extract the data as variables. The variable sizes are
    'separated by quotes as indicated in the PL command above?
    'x = (DataByte0 * 1000) + (DataByte1 * 100) + (DataByte2 * 10) + DataByte3

    Alonzo, it sounds like you have an ambitions SD card project! To read that data out of SPRAM with the widths you stated, it would be something like this, calling the subroutine DecodeSP that follows:
    Nbytes=4 : sPointer=0 : GOSUB DecodeSP
  x = result  ' 1234
  Nbytes=1 : sPointer=4 : GOSUB DecodeSP
  x = result  ' 5
  Nbytes=1 : sPointer=5 : GOSUB DecodeSP
   x = result  ' 6
 Nbytes=5 : sPointer=6 : GOSUB DecodeSP
   x = result  ' 78901    ' <-- this is actually too large for one word!
 Nbytes=5 : sPointer=11 : GOSUB DecodeSP
   x = result  ' 23456
 Nbytes=5 : sPointer=16 : GOSUB DecodeSP
  x = result  ' 78901   ' too large too.

  DecodeSP:  ' enter with sPointer, Nbytes
    result=0
    FOR idx=0 to Nbytes-1
      GET idx+sPointer, ascii
      result = result*10 + (ascii - $30)  ' convert ascii to number and accumulate
    NEXT
    RETURN

    ▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔▔
    Tracy Allen
    www.emesystems.com
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-08-04 14:06
    Tracy,

    ·· Right you are...I guess I think of it (127) as useful since I frequently check it in different code modules.·· Then again, I can't remember really using more than 64 bytes of it, tops.· As for the OP, I believe he's only trying to read the first 4 bytes into a Word variable.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
  • AlonzoAlonzo Posts: 3
    edited 2005-08-04 14:41
    That works perfectly. Many thanks to everyone for all the assistance. The modifided code is submitted below. Thanks Chris for introducing me to this Forum.

    ' {$STAMP BS2p}
    ' {$PBASIC 2.5}
    '
    '**********************************************************************************************************************
    'Constants

    SD_Data_OUT CON 0 'Serial data TO SD Module
    SD_Data_IN CON 1 'Serial data FROM SD Module
    Right_OE CON 5 'Right motor enable, HIGH turns motor OFF, LOW enables motor
    Left_OE CON 6 'Left motor enable, HIGH turns motor OFF, LOW enables motor
    SD_Fpin CON 7 'Fpin for MMC/SD Module
    LCD CON 8 'Serial LCD Data
    DAC_LOAD CON 9 'CS
    DAC_DATA CON 11 'Digital to Analog Data line, Data is shifted in on the falling edge
    DAC_CLK CON 10 'Digital to Analog Clock line, Data is shifted in on the falling edge
    MSB_FIRST CON 1 'MSB First
    LSB_FIRST CON 0 'LSB First
    ADC_CS CON 12 'Analog to Digital Chip Select line, A LOW enables the ADC
    ADC_Din CON 13 'Analog to Digital Data Into AD Convertor, load channel configuration data into the ADC
    ADC_Dout CON 14 'Analog to Digital Data Out of AD Convertor, data changes on falling edge of clock
    ADC_CLK CON 15 'Analog to Digital Clock line
    N9600 CON $40F0 'Use with BS2-SX for BPI-216 2x16 LCD display
    I CON 254 'Instruction prefix value for BPI-216 2x16 LCD display
    CLR CON 1 'Clear Screen command for the LCD
    Right_Motor CON 15
    Left_Motor CON 7

    ADC_Right_Press CON 24 'CH0 of ADC
    ADC_Right_Flow CON 25 'CH1 of ADC
    ADC_Left_Press CON 26 'CH2 of ADC
    ADC_Left_Flow CON 27 'CH3 of ADC
    BaudMode CON 240 '8 bit no parity true for BS2-sx and BS2-p

    '**********************************************************************************************************************
    'Variables
    Left_Flow VAR Word
    Right_Flow VAR Word
    Rx_Pressure VAR Byte
    Left_Pressure VAR Word
    Right_Pressure VAR Word
    Status VAR Nib
    Burdened_Delta VAR Nib
    Bilevel_Mode VAR Bit '0 = OFF, 1 = ON
    x VAR Word
    y VAR Word
    'FC CON $89
    Nbytes VAR Byte
    sPointer VAR Byte
    result VAR Word
    idx VAR Byte
    ascii VAR Byte

    PAUSE 500
    Rx_Pressure = 1311
    Burdened_Delta = 6
    Bilevel_Mode = 1


    'FW = File Write, Open the SD Card AND WRITE a file name TO it
    DEBUG "....................",CR
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"FW ","PatData.txt",CR]
    SERIN SD_Data_IN,240,[noparse][[/noparse]STR x \2]
    DEBUG "File write: ",STR x \2, CR
    PAUSE 200

    'PL = Put Line, put a line of data on the SD card
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"PL ","1234","5","6","12345","23456","45678","\r",CR]
    SERIN SD_Data_IN,240,[noparse][[/noparse]STR x \2]
    DEBUG "Line wrote: ",STR x \2, CR
    PAUSE 500

    'FC = File Closed, close the file
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"FC",CR ]
    SERIN SD_Data_IN,240,[noparse][[/noparse]STR x \2]
    DEBUG "File closed:",STR x \2, CR
    PAUSE 200

    'FR = File Read, read the PatData.txt file
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"FR ","PatData.txt",CR ]
    SERIN SD_Data_IN,240,[noparse][[/noparse]STR x \2]
    DEBUG "Read Status:",STR x \2, CR
    PAUSE 200

    'GL = Get Line, get the line of data that was written
    'on the SD card above
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"GL",CR]
    SERIN SD_Data_IN,240,10000,No_Data,[noparse][[/noparse]SPSTR 21]
    PAUSE 200

    'display the data on the debug screen
    FOR y = 0 TO 20
    GET y, Rx_Pressure
    DEBUG "Data: ",Rx_Pressure,CR
    NEXT
    DEBUG "....................",CR,CR


    'Question was: At this point of the code, how do I put the data into the SP RAM and then
    'extract the data as variables. The variable sizes are
    'separated by quotes as indicated in the PL command above?
    'Answer below:



    Nbytes=4 : sPointer=0 : GOSUB DecodeSP
    x = result ' 1234
    DEBUG "1234 Data: ",DEC x,CR,CR
    Nbytes=1 : sPointer=4 : GOSUB DecodeSP
    x = result ' 5
    DEBUG "5 Data: ",DEC x,CR,CR
    Nbytes=1 : sPointer=5 : GOSUB DecodeSP
    x = result ' 6
    DEBUG "6 Data: ",DEC x,CR,CR
    Nbytes=5 : sPointer=6 : GOSUB DecodeSP
    x = result ' 12345 ' <-- changed to 12345
    DEBUG "12345 Data: ",DEC x,CR,CR
    Nbytes=5 : sPointer=11 : GOSUB DecodeSP
    x = result ' 23456
    DEBUG "23456 Data: ",DEC x,CR,CR
    Nbytes=5 : sPointer=16 : GOSUB DecodeSP
    x = result ' 45678 ' changed to 45678
    DEBUG "45678 Data: ",DEC x,CR,CR
    GOTO File_Size

    DecodeSP: ' enter with sPointer, Nbytes
    result=0
    FOR idx=0 TO Nbytes-1
    GET idx+sPointer, ascii
    result = result*10 + (ascii - $30) ' convert ascii to number and accumulate
    NEXT
    RETURN

    File_Size:

    'FS = File Size, indicate the size of the PatData.txt file
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"FS ","PatData.txt",CR ]
    SERIN SD_Data_IN,240,[noparse][[/noparse]STR x \2]
    DEBUG "File size: ",STR x \2, CR
    PAUSE 200

    GOTO Close_File

    No_Data:
    DEBUG "****************",CR
    DEBUG "Time-out Error",CR
    DEBUG "****************",CR
    PAUSE 200

    'FC = File Closed, close the file
    Close_File:
    SEROUT SD_Data_OUT,240,[noparse][[/noparse]"FC",CR]
    SERIN SD_Data_IN,240,2000,Not_Closed,[noparse][[/noparse]STR x \2]
    DEBUG "File closed:",STR x \2, CR
    GOTO Completed

    Not_Closed:
    DEBUG "File may not have closed"

    Completed:
    DEBUG "....................",CR,CR


    END
  • Chris SavageChris Savage Parallax Engineering Posts: 14,406
    edited 2005-08-04 14:55
    Alonzo,

    ·· No problem!· A lot of helpful knowledgeable people here.

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    Chris Savage
    Parallax Tech Support
    csavage@parallax.com
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