homebrew-r31jp

Go to nitsky's original repo for the latest version.

1. Install drivers for your serial-to-usb connector

My lab kit came with a Sabrent connector, so I used the CB-RS232 driver at https://www.sabrent.com/downloads/.

2. Run

brew tap wangray/r31jp https://github.com/wangray/homebrew-r31jp
brew install r31jp 

Copied from http://davidyamnitsky.com/blog/2013/07/27/r31jp/:

Create an assembly file, and when you are ready to load it, just run

r31jp filename.asm

The r31jp script assembles the code with as31 and then waits for you to reset the R31JP in MON mode. It then uploads the code, and opens a serial console using screen. You can run the code by switching the board into RUN mode and hitting reset, or by entering the command G8000. The script takes one argument, the path to an 8051 assembly file, and has two options, -s to specify the serial port for the R31JP, and -b to choose the baud rate of MINMON. The default serial port is /dev/tty.usbserial which the Prolific driver chooses for Mac OS X, and the default baud rate is 9600.

You can also generate the .hex file yourself using as31 filename.asm, and load it onto the board using the same command as above.

This fork just switches from SHA1 to SHA256, since SHA1 is disabled in newer versions of homebrew. All creds to nitsky!!