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README: add details of usb15 protocol mode

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Grigori Goronzy 2016-05-14 13:21:43 +02:00
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README.md
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@ -4,15 +4,16 @@ stcgal - STC MCU ISP flash tool
stcgal is a command line flash programming tool for STC MCU Ltd. [1]
8051 compatible microcontrollers. The name was inspired by avrdude [2].
STC microcontrollers have a UART based boot strap loader (BSL). It
STC microcontrollers have an UART/USB based boot strap loader (BSL). It
utilizes a packet-based protocol to flash the code memory and IAP
memory over a serial link. This is referred to as in-system programming (ISP).
The BSL is also used to configure various (fuse-like) device
memory over a serial link. This is referred to as in-system programming
(ISP). The BSL is also used to configure various (fuse-like) device
options. Unfortunately, this protocol is not publicly documented and
STC only provide a (crude) Windows GUI application for programming.
stcgal is a full-featured Open Source replacement for STC's Windows software;
it supports a wide range of MCUs, it is very portable and suitable for automation.
stcgal is a full-featured Open Source replacement for STC's Windows
software; it supports a wide range of MCUs, it is very portable and
suitable for automation.
[1] http://stcmcu.com/
[2] http://www.nongnu.org/avrdude/
@ -43,13 +44,14 @@ So far, stcgal was tested with the following MCU models:
* IAP15F2K61S2 (BSL version: 7.1.4S)
* STC15L2K16S2 (BSL version: 7.2.4S)
* STC15W408AS (BSL version: 7.2.4T)
* STC15W4K56S4 (BSL version: 7.3.4T)
* STC15W4K56S4 (BSL version: 7.3.4T, UART and USB mode)
Compatibility reports, both negative and positive, are welcome.
Features
--------
* UART and USB BSL support
* Display part info
* Determine operating frequency
* Program flash memory
@ -58,12 +60,13 @@ Features
* Read unique device ID (STC 10/11/12/15)
* Trim RC oscillator frequency (STC 15)
* Automatic power-cycling with DTR toggle
* Automatic protocol detection
* Automatic UART protocol detection
Installation
------------
stcgal requires Python 3.2 (or later) and pySerial. You can run stcgal
stcgal requires Python 3.2 (or later) and pySerial. USB support is
optional and requires pyusb 1.0.0b2 or later. You can run stcgal
directly with the included ```stcgal.py``` script. The recommended
method for permanent installation is to use Python's setuptools. Run
```./setup.py build``` to build and ```sudo ./setup.py install```
@ -117,7 +120,8 @@ protocols and MCU series is as follows:
* ```stc12``` Most STC10/11/12 series (default)
* ```stc15a``` STC15x104E and STC15x204E(A) series
* ```stc15``` Most STC15 series
* ```auto``` Automatic detection
* ```usb15``` USB support on STC15W4 series
* ```auto``` Automatic detection of UART based protocols
The text files in the doc/ subdirectory provide an overview over
the reverse engineered protocols used by the BSLs. For more details,
@ -276,6 +280,14 @@ error, such as a protocol error or I/O error, results in an exit
status of 1. If the the user aborted stcgal by pressing CTRL-C,
that results in an exit status of 2.
### USB support
STC15W4 series have an USB-based BSL that can be optionally
used. USB support in stcgal is experimental and might change in the
future. USB mode is enabled by using the ```usb15``` protocol. The
port (```-p```) flag as well as the baudrate options are ignored for
the USB protocol. RC frequency trimming is not supported.
License
-------