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SwapForth J1a-ICestudio

SwapForth J1a processor for Icestudio

Use the J1a Forth processor very easily!

The j1a-simple is a modified version of the J1a:

  • It can be opened with the Icestudio open source visual editor
  • Baudrate: 115200
  • Clock frequency: 12Mhz (no PLL)
  • No DTR used

It can be synthesized on any of the supported boards with OpenFPGAs, althout in this repo there are only example for the following boards:

Quick start

  • Open the j1a-simple-Alhambra-II.ice file with Icestudio (5.1 or higher). Depending on the board, it is located in the folders j1a-AlhambraII or j1a-icestick (if you have another board just choose anyone and change the input/outpus)

  • Connect the Alhambra-II board (or compatible board) and upload the design
  • Open a serial terminal (115200 bauds) (You can use the one available inside icestudio (0.5.1-dev or higher) or an external one)
  • Press the ENTER key. You will see the ok message
  • Your Forth environment is ready!!

Hello world examples!

From the terminal, type the following Forth examples:

  • Calculating 1 + 2
1 2 + .
  • Turning on the leds
$1f leds
  • Binary counter
: counter 32 0 do i leds 10 ms loop ;
counter

Vídeo

Click to see the youtube video]

Credits

  • Project SwapForth By James Bowman. Thanks a lot for this awesome project. The J1a processor was the first i tried with the icestorm open source tools. I learnt a lot and it was a source of inspiration

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SwapForth J1a processor for Icestudio

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