ldmicro-changes.txt

用PIC單片機與AVR單片機製作PLC控制的階梯圖程序。

== Release 1.5

    * Add untested support for ATmega32.

    * Remove annoying lag in user interface when editing large (hundreds
      of ops) programs

== Release 1.4

    * Fix a terrible bug in the target for the ATmega8; because there is
      no PORTA/DDRA/PINA, I broke an assumption in my code and failed
      to set up the port directions.

== Release 1.3

    * Timer delays are represented as a signed 32-bit integer count
      of microseconds. If the user provides a delay >= 2**31 us, then
      show an error instead of just letting things wrap.

    * Change the start-up behaviour of TOF timers. Previously they would
      start from a count of zero, so they would be on (independent of
      rung-in) until they counted themselves off. Now they start out
      at full count (as if rung-in has been low for a very long time),
      so rung-out is low until rung-in goes high.

== Release 1.2

    * Add an untested target for the ATmega8

    * Add a special instruction to simplify piecewise linear tables

    * Fix some user interface bugs: it was possible to drag the top of the
      I/O list so high that you couldn't grab it again, and there were
      some cases in which the pin number associated with UART and PWM
      variables was not displayed

== Release 1.1

    * Fix persistent variables, which were broken for the PIC16F628

== Release 1.0

    * Fix bug in which the filename that appears in the title bar of the
      main window failed to get updated when opening/saving a file using
      the keyboard shortcuts (Ctrl+O/+S)

    * Fix simulation crash when the ladder logic program divides by zero

    * Fix jumpy scrolling on programs with many rungs of logic when the
      cursor is off-screen

== Release 0.9

    * Fix bug with formatted string op on the AVR
    * Fix previously-untested ATmega16 and ATmega162 targets, which were
      completely broken

=== Release 0.8

    * Fix PORTA on the PIC16F819 (came up assigned to ADCs, of course)

=== Release 0.7

    * Support arbitrary character (\xAB) escapes in formatted string op
    * Fix a bug in which the title bar of the main window was not updated

=== Release 0.6

    * Add formatted text output over serial (e.g. to an LCD or a PC)
    * Add ability to make variables persistent (i.e. auto-saved in EEPROM)
    * Add look-up table instructions
    * Fix a bug with the PORTE pins on some AVRs
    * Fix miscellaneous user interface bugs

=== Release 0.5

    * Interpretable byte code target
    * Shift register and master control relay instructions

=== Release 0.4

    * Make ADCs work on the AVRs

=== Release 0.3

    * Support serial for AVR
    * Support PWM for PIC16 and AVR
    * Show program filename in title bar of main window
    * Untested support for PIC16F88, F819, F876
    * Generate ANSI C code from ladder diagram

=== Release 0.2

    * Support serial communications (using UART), PIC16 only
    * Support ADC reads, PIC16 only
    * Simulation environment for ADC and serial
    * Support ASCII character constant ('a') literals
    * Fix PORTA pins in PIC16F628 (should assign as GPIO, not to comparator)
    * Make file open/save dialogs work under Win98
    * Fix PORTA/PORTE pins in PIC16F877 (should assign as GPIO, not to ADC)
    * Add ability to comment your program
    * Fix bug when a relative filename is given on the command line and
      the `Compile As' dialog is later used to specify a destination in
      a different directory

=== Release 0.1
    
    Initial release