kflash, A Python-based Kendryte K210 UART ISP Utility

Usage

# kflash --help
usage: kflash [-h] [-p PORT] [-f FLASH] [-b BAUDRATE] [-l BOOTLOADER]
                [-k KEY] [-v] [-t] [-n] [-s] [-B BOARD] [-S SLOW]
                firmware

positional arguments:
firmware              firmware bin path

optional arguments:
-h, --help            show this help message and exit
-p PORT, --port PORT  COM Port
-f FLASH, --flash FLASH
                        SPI Flash type, 0 for SPI3, 1 for SPI0
-b BAUDRATE, --baudrate BAUDRATE
                        UART baudrate for uploading firmware
-l BOOTLOADER, --bootloader BOOTLOADER
                        bootloader bin path
-k KEY, --key KEY     AES key in hex, if you need encrypt your firmware.
-v, --verbose         increase output verbosity
-t, --terminal        Start a terminal after finish (Python miniterm)
-n, --noansi          Do not use ANSI colors, recommended in Windows CMD
-s, --sram            Download firmware to SRAM and boot
-B BOARD, --Board BOARD
                        Select dev board, e.g. kd233, dan, bit, goD, goE or
                        trainer
-S SLOW, --Slow SLOW  Slow download mode

Attention

Maixgo with openec firmware, BOARD must choose -B goE, and should choose sencond com port.

With cmsis-dap firmware(before 2019.02.21), BOARD must use -B goD.

You can update new cmsis-dap firmware, it is same as openec.

For K210 Trainer V0.01b, BOARD must choose -B trainer.

For KD233, BOARD must choose -B kd233, and the jumper for kd233 automatic download circuit must be set.

Installation

sudo pip3 install kflash

If you receive an error, please try

sudo python -m pip install kflash
sudo python3 -m pip install kflash
sudo pip install kflash
sudo pip2 install kflash

For linux users, first of all, you must add yourself to dialout group. Or you have to use root permission every time.

sudo usermod -a -G dialout $(whoami)

Sample Usage

# Linux or macOS
# Using pip
kflash -B dan firmware.bin
kflash -B dan -t firmware.bin # Open a Serial Terminal After Finish
# Using source code
python3 kflash.py -B dan firmware.bin
python3 kflash.py -B dan -t firmware.bin # Open a Serial Terminal After Finish

# Windows CMD or PowerShell
# Using pip
kflash -B dan firmware.bin
kflash -B dan -t firmware.bin # Open a Serial Terminal After Finish
kflash -B dan -n -t firmware.bin # Open a Serial Terminal After Finish, do not use ANSI colors
# Using source code
python kflash.py -B dan firmware.bin
python kflash.py -B dan -t firmware.bin # Open a Serial Terminal After Finish
python kflash.py -B dan -n -t firmware.bin # Open a Serial Terminal After Finish, do not use ANSI colors

# Windows Subsystem for Linux
# Using pip
sudo kflash -B dan -p /dev/ttyS13 firmware.bin # ttyS13 Stands for the COM13 in Device Manager
sudo kflash -B dan -p /dev/ttyS13 -t firmware.bin # Open a Serial Terminal After Finish
# Using source code
sudo python3 kflash.py -B dan -p /dev/ttyS13 firmware.bin # ttyS13 Stands for the COM13 in Device Manager
sudo python3 kflash.py -B dan -p /dev/ttyS13 -t firmware.bin # Open a Serial Terminal After Finish

For fast programming,

# Using pip
# This will enable opoenec super-baudrate!
kflash -b 4500000 -B goE firmware.bin
# Trainer could use 8000000 baudrate!
kflash -b 8000000 -B trainer firmware.bin
# Dan could use 3000000 baudrate!
kflash -b 3000000 -B dan firmware.bin

# Using source code
# This will enable opoenec super-baudrate!
python3 kflash.py -b 4500000 -B goE firmware.bin
# Trainer could use 8000000 baudrate!
python3 kflash.py -b 8000000 -B trainer firmware.bin
# Dan could use 3000000 baudrate!
python3 kflash.py -b 3000000 -B dan firmware.bin

Execute user code directly in SRAM and view in serial terminal,

# Using pip
# For `.elf` file
kflash -b 115200 -B goE -s -t hello_world
# For `.bin` file
kflash -b 115200 -B goE -s -t hello_world.bin

# Using source code
# For `.elf` file
python3 kflash.py -b 115200 -B goE -s -t hello_world
# For `.bin` file
python3 kflash.py -b 115200 -B goE -s -t hello_world.bin

Requirements

• python>=3 or python=2.7

• pyserial>=3.4

• pyelftools>=0.25

  Python3 is recommended.

If your python version below python3.4, you need:

• enum34>=1.1.6

Windows Requirements

• Download and Install Python3 at python.org
• Download the get-pip.py at https://bootstrap.pypa.io/get-pip.py
• Start CMD or PowerShell Terminal and run the following command

python get-pip.py
python -m pip install pyserial
python -m pip install pyelftools
# When you python version below python3.4
python -m pip install enum34

---

macOS Requirements

# Install Homebrew, an awesome package manager for macOS
/usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
brew install python
python3 -m pip3 install pyserial
python3 -m pip3 install pyelftools

---

Ubuntu, Debian Requirements

sudo apt update
sudo apt install python3 python3-pip
sudo pip3 install pyserial
sudo pip3 install pyelftools

---

Fedora

sudo dnf install python3
sudo python3 -m pip install pyserial
sudo python3 -m pip install pyelftools

---

CentOS

sudo yum -y install epel-release
sudo yum -y install python36u python36u-pip
sudo ln -s /bin/python3.6 /usr/bin/python3
sudo ln -s /bin/pip3.6 /usr/bin/pip3
sudo pip3 install pyserial
sudo pip3 install pyelftools

Trouble Shooting

Could not open port /dev/tty*: [Errno 13] Permission denied: '/dev/tty*'

For Windows Subsystem for Linux, you may have to use sudo due to its docker like feature

• Add your self to a dialout group to use usb-to-uart devices by

sudo usermod -a -G dialout $(whoami)

• Logout, and log in.

---

UART Auto Detecting is Not Working, or Select the Wrong UART Port

Windows

• Check the COM Number for your device at the Device Manager, such as USB-SERIAL CH340(COM13).

# Using pip, only need once when you install
pip install kflash
kflash -p COM13 firmware.bin
# Or
kflash.exe -p COM13 firmware.bin
# Using source code
python kflash.py -p COM13 firmware.bin

Windows Subsystem For Linux(WSL)

• Check the COM Number for your device at the Device Manager, such as USB-SERIAL CH340(COM13).

# Using pip, only need once when you install
sudo pip3 install kflash
sudo kflash -p /dev/ttyS13 firmware.bin # You have to use *sudo* here
# Using source code
sudo python3 kflash.py -p /dev/ttyS13 firmware.bin # You have to use *sudo* here

Linux

• Check the USB Device Name, Usually presented as ttyUSB*

ls /dev/ttyUSB*

• It will print :

$ ls /dev/ttyUSB*
/dev/ttyUSB0
/dev/ttyUSB2
/dev/ttyUSB13

• Choose the one you think belongs to your device, or you may try multimule names.

# Using pip
python3 kflash.py -p /dev/ttyUSB13 firmware.bin
# Using source code
kflash -p /dev/ttyUSB13 firmware.bin

macOS

• Check the USB Device Name, Usually presented as cu.*

ls /dev/cu.*

• It will print :

$ ls /dev/ttyUSB*
/dev/cu.wchusbserial1410
/dev/cu.wchusbserial1437
/dev/cu.SLAB_USBtoUART2333

• Choose the one you think belongs to your device, or you may try multimule names.

# Using pip
kflash -p /dev/cu.wchusbserial1410 firmware.bin
# Using source code
python3 kflash.py -p /dev/cu.wchusbserial1410 firmware.bin

You may unable to find the device even in the /dev, check the link below for drivers

• For K210 and Sipeed Dan -> WCH CH34x USB2UART Chip