Firmware replacement for STC15F mcu-based DIY Clock Kit (available from banggood [see below for link], aliexpress, et al.) Uses sdcc to build and stcgal to flash firmware on to STC15F204EA series microcontroller.
link to Banggood product page for SKU 972289
Basic functionality is working:
- time display/set (12/24 hour modes)
- date display/set
- display auto-dim
- temperature display in C
note this project in development and a work-in-progress Pull requests are welcome.
- temperature display in C/F selectable (either build or run-time)
- alarm and chime functionality
- possibly: make 12/24 hr a build option (to save precious code space)
- DIY LED Clock kit, based on STC15F204EA and DS1302, e.g. Banggood SKU 972289
- connected to PC via cheap USB-UART adapter, e.g. CP2102, CH340G. Banggood: CP2102 USB-UART adapter
- linux or mac (windows untested, but should work)
- sdcc installed and in the path (recommend sdcc >= 3.5.0)
- stcgal (or optionally stc-isp). Note you can either do "git clone --recursive ..." when you check this repo out, or do "git submodule update --init --recursive" in order to fetch stcgal.
make clean
make
make flash
-
override default serial port:
STCGALPORT=/dev/ttyUSB0 make flash -
add other options:
STCGALOPTS="-l 9600 -b 9600" make flash
If you like, you can try pre-compiled binaries here: https://github.com/zerog2k/stc_diyclock/releases
Instead of stcgal, you could alternatively use the official stc-isp tool, e.g stc-isp-15xx-v6.85I.exe, to flash. A windows app, but also works fine for me under mac and linux with wine.
note due to optimizations that make use of "eeprom" section for holding lookup tables, if using stc-isp tool, you must flash main.hex (as code file) and eeprom.hex (as eeprom file). (Ignore stc-isp warning about exceeding space when loading code file.) To generate eeprom.hex, run:
make eeprom
Some of the code assumes 11.0592 MHz internal RC system clock (set by stc-isp or stcgal). For example, delay routines would need to be adjusted if this is different.
This code is provided as-is, with NO guarantees or liabilities. As the original firmware loaded on an STC MCU cannot be downloaded or backed up, it cannot be restored. If you are not comfortable with experimenting, I suggest obtaining another blank STC MCU and using this to test, so that you can move back to original firmware, if desired.
http://www.stcmcu.com (mostly in Chinese)
stc15f204ea english datasheet: http://www.stcmcu.com/datasheet/stc/stc-ad-pdf/stc15f204ea-series-english.pdf
sdcc user guide: http://sdcc.sourceforge.net/doc/sdccman.pdf
some examples with NRF24L01+ board: http://jjmz.free.fr/?tag=stc15l204
Maxim DS1302 datasheet: http://datasheets.maximintegrated.com/en/ds/DS1302.pdf
VE3LNY's adaptation of this hardware to AVR (he has some interesting AVR projects there): http://www.qsl.net/v/ve3lny/travel_clock.html
original firmware operation flow state diagram kit instructions w/ schematic
