Platform RISC-V: RISC-V is an open, free ISA enabling a new era of processor innovation through open standard collaboration. Born in academia and research, RISC-V ISA delivers a new level of free, extensible software and hardware freedom on architecture, paving the way for the next 50 years of computing design and innovation.

Microcontroller FE310
Frequency 320MHz
Flash 16MB
Vendor SiFive


Please use freedom-e300-hifive1 ID for board option in “platformio.ini” (Project Configuration File):

platform = riscv
board = freedom-e300-hifive1

You can override default HiFive1 settings per build environment using board_*** option, where *** is a JSON object path from board manifest freedom-e300-hifive1.json. For example, board_build.mcu, board_build.f_cpu, etc.

platform = riscv
board = freedom-e300-hifive1

; change microcontroller
board_build.mcu = fe310

; change MCU frequency
board_build.f_cpu = 320000000L


PIO Unified Debugger - “1-click” solution for debugging with a zero configuration.


You will need to install debug tool drivers depending on your system. Please click on compatible debug tool below for the further instructions and configuration information.

You can switch between debugging Tools & Debug Probes using debug_tool option in “platformio.ini” (Project Configuration File).

HiFive1 has on-board debug probe and IS READY for debugging. You don’t need to use/buy external debug probe.

Compatible Tools On-board Default
FTDI Chip Yes Yes


Name Description
Freedom E SDK Open Source Software for Developing on the SiFive Freedom E Platform