GET

Syntax: GET Location,{Word} Variable {,{Word} Variable ...}

Function

Read value(s) from Scratchpad RAM, starting at Location and store in Variable(s)*.

• Location is a variable/constant/expression (0 – 63 for Bs2e and BS2sx, and 0 – 135 for BS2p, BS2pe, and BS2px) that specifies the Scratchpad RAM location to read from.
• Variable is a variable (usually a byte; unless using the optional Word modifier) to store the value into.

*Note: The optional arguments require PBASIC 2.5.

Quick Facts

Explanation

By default, the GET command reads a byte-sized value from the specified Scratchpad RAM location and stores it into variable. All values in all locations can be retrieved from within any of the eight program slots.

Scratchpad RAM is useful for passing data to programs in other program slots and for additional workspace. It is different than regular RAM in that symbol names cannot be assigned directly to locations and each location is always configured as a byte only. The following code will read the value at location 25, store it in a variable called temp and display it:

The following example illustrates this:

temp    VAR     Byte

Main:
  GET 25, temp
  DEBUG DEC temp
  END

When using the $PBASIC 2.5 directive, multiple sequential variables may be read from the Scratchpad RAM, starting at Location, and the Word modifier may be specified for 16-bit values.

' {$PBASIC 2.5}

value   VAR     Word
value2  VAR     Word
addr    VAR     Word                            ' EEPROM address
test    VAR     Byte                            ' test byte read back

Main:
  value = $11
  value2 = $2003
  PUT 0, value, Word value2                     ' write value to SP location 0
                                                '  and value2 to SP locations 1 & 2

  value = $FF                                   ' modify variables
  value2 = $FFFF

  GET 0, value, Word value2                     ' retrieve from Scratchpad

  DEBUG HEX2 ? value                            ' display
  DEBUG HEX4 ? value2
  END

The low nibble of location 63 (BS2e and BS2sx) and location 127 (BS2p, BS2pe, and BS2px) is a special, read-only location that always contains the number of the currently running program slot. On the BS2p, BS2pe, and BS2px, the high nibble of location 127 also contains the current program slot that will be used for the READ and WRITE commands. See the demo program for an example of use.

On the BS2p and BS2pe, the state of polled input pins can be retrieved from upper Scratchpad locations:

• 128 : MAINIO pins 0 - 7
• 129 : MAINIO pins 8 - 15
• 130 : AUXIO pins 0 - 7
• 131 : AUXIO pins 8 - 15

This information can be used to determine which input pin (or pins) has triggered a polled event.