Instructions for MacOS - ntut-rf/mcu GitHub Wiki
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Install Xcode
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Install ARM GCC,
If you are using Homebrew,
# to tap the repository $ brew tap osx-cross/arm # to install the toolchain $ brew install arm-gcc-bin
If you are using MacPorts,
$ sudo port install arm-none-eabi-gcc
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Install OpenOCD
If you are using Homebrew,
$ brew install open-ocd
If you are using MacPorts,
$ sudo port install openocd
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Install Git