WHATSNEW.md

What's new in version 2.1.5

• general source code, cmake, and script file cleanup
• add support for picow and vgaboard
• update C example source code
• centralize reset function, no longer using watchdoc
• remove trim command, garbage collection in littlefs is automatic
• move all constant variables to flash, releasing RAM to better use
• expand status command to show memory and screen use.
• clarify and pack exe file header
• delete resize cmd, use clear instead
• improve release_build script (less error prone)
• add RP2350 PWM IRQ numbers
• for rp2350 all floating pointt operators as well as sqrtf function calls are handled directly with inline CM33 floating point intructions instead of wrapper calls
• for rp2350 integer divide and modulus operators are handled using inline CM33 hardware integer divide instructions instead of warpper calls
• rp2350 use expanded range of movw immediate to reduce amount of PC relative addressing
• many rp2350 peep hole optimizer opportunities

What's new in version 2.1.4

• Revert to merged cc_externs and cc_defs
• Update FUNCTIONs documentation
• Add hardware UART function and defines
• Expand heap size to maximum
• RP2350 peep hole addition + misc text diffs
• Improve peep hole optimizer logic
• Enhance status command to include memory constraints

What's new in version 2.1.3

• Internal compiler restructure, separating functional parts, moving all constants to flash.
• Multiple peep hole optimizer for RP2350 improvements.
• Extend fault handler for RP2350
• Replace sqrtf function call with inline RP2350 floating point instruction.
• Updated C examples
• Optimize integer compare, and divide for RP2350

What's new in version 2.1.2

• substitute HW FP sqrt instruction for sqrtf function call. (RP2350)
• a few more peep hole optimizations. (RP2350)

What's new in version 2.1.1

• improved peep hole optimizer. Bug fix and RP2350 floating point optimizations.

What's new in version 2.1.0

• rp2350 specific peep hole optimizations
• exclude unused code for RP2040 and RP2350, reducing pshell executable size.
• for rp2350 use FP hardware to implement sqrtf function.

What's new in version 2.0.3

• Optimize /, -, >, >=, <, <= float oprators for RP2350
• Add a few FP instruction decodes to disassembler
• Default to inline FP instructions (RP2350). Use -x compiler option to revert to RP2040 style wrapper function calls.

What's new in version 2.0.2

• Add -f compiler option to generate inline floating point operation for RP2350. The default is to generate RP2040 style wrapper function calls.
• Generate integer division sdiv for RP2350.
• Update RP2350 GPIO constants and functions for RP2350.

What's new in version 2.0.1

• Fix Heap Limit

What's new in version 2.0.0

• Pico2 (RP2350) support

What's new in version 1.2.31

• Updated to Pico SDK version 2

What's new in version 1.2.30

• fix compiler memory leak

What's new in version 1.2.29

• update functions document
• fix extern table out of order
• add simple hexdump command
• add -p (paginate) option to cat and hex commands
• cat terminate on EOF (0x1A) char

What's new in version 1.2.28

• further optimization of C compile memory management
• Vi recognizes and understands the EOF (0x1a) character. This eliminates the need do delete CTL-Z chars at the end of files transferred by xmodem which transfer files in 256 byte chunks regardless of actual file size.

What's new in version 1.2.27

• fix crash comppiling to executable

What's new in version 1.2.26

• Update disassembler module
• Update littlefs to version 2.7
• Implement standard calloc function

What's new in version 1.2.25

• rebuilt with SDK 1.5.1

What's new in version 1.2.24

• optimize memory management
• fix compiler memory leak

What's new in version 1.2.23

• fix cat command crash
• Add support for get_rand_32 SDK function

What's new in version 1.2.22

• Recompiled with gcc 12.2, SDK 1.5, littlefs to 2.5.1

What's new in version 1.2.21

• support builing for vgaboard with filesystem on microSD

What's new in version 1.2.20

• fix stack allocation for local multi dimensional arrays
• fix sizeof for multi dimensional arrays, was limited to 1 dimension
• fix small global data limit for strings literals
• add strtol string function and compiler version flag in executable's header
• suppress gcc12 newlib linker warnings

What's new in version 1.2.19

• fix compound assignment bug
• implement #pragma uchar, tells compiler to use unsigned char variables
• grow symbol table dynamically
• fix global greater than 4K bug

What's new in version 1.2.18

• a few more peep hole optimizations
• hide hidden files, add -a option to ls command
• update tar to preserve executable attribute
• restore missing instruction at end of function disassembly (cosmetic)
• add cmd line option to disable peep hole optimizer
• Fix bugs with dgreadln

What's new in version 1.2.17

• fix command line parameter setup, broken by new invocation code
• fix missing source line in error msg
• update examples
• fix potential vi memory leak
• drop peep hole, does more harm than good
• fix forward function declaration disassembly
• robust user code invocation
• add compiler source comments

What's new in version 1.2.16

• optimize function calls. save/restore fewer registers
• adjust exit function
• update peep-hole optimizer, add array indexing optimization
• add quicksort example
• line buffering serves no purpose, remove it.

What's new in version 1.2.15

• Another critical printf fix
• optimize float relational operators
• trig function optimization

What's new in version 1.2.14

• Merge CC and VI uninitialized globals to save memory.
• Fix printf bug. prevent uncontrolled stack growth
• Check executable attributes on tab completion.
• Fix executable attribute on copy and refactor tab completion.

What's new in version 1.2.13

• optimize integer compare operators
• fix broken /= *= += -= for floats

What's new in version 1.2.12

• fix load data init bug preventing older code execution
• save history on quit and usb reboot
• add pentamino example
• more peep hole optimizations
• allow constant integer or float expressions as #define values

What's new in version 1.2.11

• command history survives reboots
• integer arrays were not always word aligned, causing crashes on CM0
• allow negative values in simple defines
• fix executable search path misbehavior

What's new in version 1.2.10

• binary executable now pshell version independent
• fix search path bug

What's new in version 1.2.9

• executable binaries invoked directly by name, remove run command
• executable search order is current directory followed by /bin directory
• verify executable is compatible with current version of pshell, suggest recompile if not

What's new in version 1.2.8

• compiler supports the -o option to create binary executable.
• run command added to run binary executable, till further intgration

What's new in version 1.2.7

• for compatibility use Unix values for O_RDONLY, O_WRONLY, etc, and translate them automatically to LFS mode values.
• char type now defaults to signed, use -u option for unsigned chars

What's new in version 1.2.6

• fix bug loading small negative constants.
• support octal and hexadecimal character representations in strings and char constants
• revert banner update and add size detect command

What's new in version 1.2.5

• internal cleanup of branching logic
• fix c-style multi line comment crash
• check for line buffer and symbol table overflow
• source file no longer needs to be memory resident for compilation.
• fix bad branch at bootom of long for loops

What's new in version 1.2.4

• fix parameter mismatch crash
• check for AST overflow
• increase AST to 32K
• remove a few redundant instructions

What's new in version 1.2.3

• rudimentary peep-hole optimization
• display correct line in error message
• fix boolean expression shortcut

What's new in version 1.2.2

• consisent use of long branch to avoid "too far" errors
• predefine PICO_ERROR_TIMEOUT
• detect undefined struct and union

What's new in version 1.2.1

• remove compiler branch distance restriction

What's new in version 1.2.0

• C compiler now generates native arm code
• virtual machine removed

What's new in version 1.1.17

• fix interaction between tab completion and the command history
• make sure to truncate when replacing a file
• wumpus example

What's new in version 1.1.16

• fix broken keyboard BREAK option

What's new in version 1.1.15

• fix handling of . and .. notation for directory names
• allow for(;;) synctax. Passes test 00034.c

What's new in version 1.1.14

• fix USB buffer overflow pasting in Vi
• Remove ESC as BREAK key
• Add getting started section

What's new in version 1.1.13

• fix tar handling of linux tar peculiarities
• revert update that broke test cae 00033
• add 200+ test cases
• remove xget file size limit
• cosistent use of CTL-C or ESC for user break

What's new in version 1.1.12

• fix compiler fail when break statement is used in while loop.

What's new in version 1.1.11

• compiler checks for code segment overflow
• compiler checks for data segment overflow

What's new in version 1.1.10

• forward function declaration support
• delete io.* and update all code to use standard (stdio) functions
• minor dgreadln optimization/cleanup
• compiler readability/maintainability improvements

What's new in version 1.1.9

• moved all source files to their own directory
• Added Unix compatible tar command
• Added recursive rmdir command

What's new in version 1.1.8

• mostly readability reorganization of compiler source
• added missing fmodf function since it's recommended by the compiler
• fixed missed opportunity optimizing modulus operator. (port introduced bug)
• updated functions list
• added lorenz simulation example

What's new in version 1.1.7

• constant expressions for global declarations

What's new in version 1.1.6

• command history and recall added to the shell

What's new in version 1.1.5

• formalized three cmake build options

-DUSB_CONSOLE=[ON|OFF]      Build for USB, otherwise UART
-DWITH_IRQ=[ON|OFF]         Build with interrup handling support
-DWITH_KBD_HALT=[ON|OFF]    Build with run-time kbd CTL-C checks

Turning off IRQ support and keyboard halt checking can significantly improve performance,

What's new in version 1.1.4

• add strncpy, strncmp, strncat, strrchr, asinf, acosf, atanf, atan2f, sinhf, coshf, tanhf, asinhf, acoshf, atanhf and log10f functions
• append .c to compiler filename if not specified
• add interrupt driven LED fade example
• a few minor instruction optimizations

What's new in version 1.1.3

• fixed compiler bug triggered by mid block declarations
• added exit function
• added popcount function
• added strchr function

What's new in version 1.1.2

• added Conway's game of life
• polished a few knobs.
• hopefully fixed the last of the old compiler induced syntax errors?

What's new in version 1.1.1

• fix USB startup failures
• fix compile errors with older version of GCC

What's new in version 1.1.0

• Xmodem code consolidated.
• Interrupt handling.
• Removed stdinit-lib submodule dependency
• compiler support for taking address of function (needed for interrupt support)
• file IO to file system
• Added compiler help

What's new in version 1.0.8

• proper handling of system calls with variable number of arguments. (remove printf hack)
• argument type and number checking for all system calls.
• removed stdlib-init submodule dependency.
• consolidated xmodem code.
• implemented move and copy to directory

What's new in version 1.0.7

• SDK ADC function support
• SDK SPI function support
• SDK I2C function support
• Predefined SDK constants for SDK function parameters
• Vi uses secondary screen buffer such that prior screen restored on exit
• Fix build errors under SDK 1.3.x
• fix editor bug when more than one file name used in a command.

What's new in version 1.0.6

• file io functions open close read write lseek rename remove

What's new in version 1.0.5

• use float functions sqrtf sinf cosf tanf logf powf instead of double versions
• new string function strdup
• added string example
• improve compiler error diadnostics
• added flash boot to usb loader command
• improved vi keyboard handling

What's new in version 1.0.4

• function calls to Pico SDK gpio_* and pwm_* functions added
• C code examples
• sprintf and atoi function support
• string functions strcmp, strcpy, strcat, strlen, memcmp
• reboot command
• reboot on crash