Open source ARM Cortex-M microcontroller library
Why do you think that https://github.com/atmelcorp/atmel-software-package-samv7 is a good alternative to libopencm3
Open source ARM Cortex-M microcontroller library
Why do you think that https://github.com/atmelcorp/atmel-software-package-samv7 is a good alternative to libopencm3