TeensyRPN42

What ???

Trying to compile Free42 on a Teensy4.

It's a PlatformIO project, copied some code from free42 into lib and trying to compile it...

Allmost, just some link references to open/unlink/link file operations triggered from somethere ???

Status

Ultraexperimental.

Works with double precision over terminal.

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T=0 
Z=0 
Y=2.92371704723␘-1 
X=-1.75637355817␘-1

Software

• replaced scanf %e %g with own parser.

• quad precission ?

  • checking free42(swissmicro build process..)

    • gcc111libbid-arm64.a - lib src is packaged with it. And available on github
    • there is scanf stuff in common/core_phloat.cc only when not ARM build ?
    • cmd line:

    arm-none-eabi-g++ -Os -DDM42_OLDHW -I../common -DRELEASE -MMD -Wall -Wno-misleading-indentation -Wno-parentheses -Wno-write-strings -Wno-maybe-uninitialized -Wno-unknown-pragmas -Wno-class-memaccess -Wno-sign-compare -fno-exceptions -fno-rtti -DVERSION="\"3.3.8\"" -DDECIMAL_CALL_BY_REFERENCE=1 -DDECIMAL_GLOBAL_ROUNDING=1 -DDECIMAL_GLOBAL_ROUNDING_ACCESS_FUNCTIONS=1 -DDECIMAL_GLOBAL_EXCEPTION_FLAGS=1 -DDECIMAL_GLOBAL_EXCEPTION_FLAGS_ACCESS_FUNCTIONS=1 -D_WCHAR_T_DEFINED  -fdata-sections -ffunction-sections -Wl,--gc-sections -ggdb -mthumb -march=armv7e-m -mfloat-abi=hard -mfpu=fpv4-sp-d16 -DARM -DBCD_MATH -c -o core_phloat.o ../common/core_phloat.cc

  • It builds with the intel lib but it's a bit (way too) large

    ld: region `RAM' overflowed by 798408 bytes
    ld: region `FLASH' overflowed by 2006716 bytes

Hardware

Ideas...

• STM32 ? F411RE - is dev board (Or F429? 82-168 IOs)

  RAM:   [=         ]   9.7% (used 12704 bytes from 131072 bytes)
  Flash: [======    ]  62.7% (used 328636 bytes from 524288 bytes)

  Connect to Nucleo STLink programmer part:

  • Remove SB13/SB14 for TX/RX connection to Nucleo MCU
  • Connect SWD (SWO not needed) (Open Jumpers to Nucleo MCU)
  • Connect TX->RX Rx->TX

• Display ???

  • OLED ? 256x64
  • VFD ?? cool but power usage ???

• Keys

  • K.Choc low profile mechaniks
  • cheap 12mm clickers ?
  • RGB LEDs under keys ? SK6812-E | SK6805

• Power ?

  • Single Lipo ? Cheap Charger...

Start with a mini board ? Only the top three rows ? Uhm mhm might be tedious to map that, especially the func key top row ?

Refs

thomasokken's ingenious https://thomasokken.com/free42 https://github.com/aswild/free42

And code on github: https://github.com/swissmicros/free42

OpenRPNCalc ? on github, uses CubeIDE 🤯 and own code..