isp-programmer

ISP Programmer for NXP Cortex-M Chips

Command-line tool for programming NXP microcontrollers via the UART ISP interface.

Features

Secure Write

To prevent bricking the chip during an interrupted write:

The checksum in flash is first set to zero, forcing the chip to boot into ISP mode if power is lost.
The image is then written from the topmost page down to the first page.
The first sector (which contains the valid checksum) is written last.

This ensures that any failure during programming will leave the chip in ISP mode.

Chip Families Supported:

LPC80x
- LPC802
- LPC804
LPC82x
- LPC822
- LPC824
LPC84x
- LPC844
- LPC845

Untested, expected to work

LPC81x
- LPC810
- LPC811
- LPC812
LPC83x
- LPC832
- LPC834
LPC86x
- LPC865

Chips using UU-encoded protocols (e.g., LPC1700 family) are not supported. Other NXP devices with 1 kB sectors may work if added to the lpctools_parts.def file.

The configuration file is identical to that used by the lpctools project.

Installation

From PyPI

pip install isp_programmer

From Source

git clone https://github.com/snhobbs/isp-programmer.git
cd isp-programmer
pip install .

Default chip definitions are bundled. For custom chips, use the –config-file flag or copy your lpctools_parts.def to /etc/lpctools_parts.def.

Usage

Erase Entire Flash

isp_programmer --device /dev/ttyUSB0 -b 9600 -crystal_frequency 12000 masserase

Program Flash Image

isp_programmer --device /dev/ttyUSB0 -b 9600 -crystal_frequency 12000 writeimage --imagein blinky804.hex

Read Chip Info

isp_programmer --device /dev/ttyUSB0 -b 9600 -crystal_frequency 12000 querychip