Weird bevaviour with STC15W408AS about stc_diyclock

[zerog2k]

This looks different from the ones this firmware is for.
This firmware is for variants which drive individual 7 segment digits. Yours looks like maybe it has a 4x 7-segment display driven as a single unit, which probably has slightly different pinout.

The STC15F204EA and STC15W404AS/408AS are essentially same pinout, just the others have more ram, code, and peripherals

Do you have a schematic?

[zerog2k]

If you are sure it was working before with this firmware, perhaps it's one of the variants, e.g. HW_MODEL_C
review this issue: #20
and if it is, likely you could try building it with this option added to platformio.ini:
build_flags = -DHW_MODEL_C

[Kobbe1]

Sorry for the delay but wanted to try it again to be sure. I had played around with the DHW_MODEL_C flag in the makefile before, tried it again, but 0 change.
The only thing that makes a difference is to swap digit and segment port in the code - still not readable but the readout changes.
Just in case below is a log of the last build in case you spot any dumb mistakes ...

`~/stc_diyclock$ make
sdcc -o build/ src/main.c --code-size 4089 --xram-size 0 --data-loc 0x30 --disable-warning 126 --disable-warning 59 -Dstc15f204ea -DWITH_ALT_LED9 -DWITHOUT_LEDTABLE_RELOC -DSHOW_TEMP_DATE_WEEKDAY -DHW_MODEL_C build/adc.rel build/ds1302.rel
Name Start End Size Max

---

ROM/EPROM/FLASH 0x0000 0x0dff 3584 4089
cp build/main.ihx main.hex

~/stc_diyclock$ STCGALPROT="stc15" make flash
stcgal/stcgal.py -p /dev/ttyUSB0 -P stc15 -t 11059 main.hex
Waiting for MCU, please cycle power: done
Target model:
Name: STC15W408AS
Magic: F51F
Code flash: 8.0 KB
EEPROM flash: 5.0 KB
Target frequency: 11.075 MHz
Target BSL version: 7.2.5T
Target wakeup frequency: 36.600 KHz
Target options:
reset_pin_enabled=False
clock_source=internal
clock_gain=high
watchdog_por_enabled=False
watchdog_stop_idle=True
watchdog_prescale=256
low_voltage_reset=True
low_voltage_threshold=3
eeprom_lvd_inhibit=True
eeprom_erase_enabled=False
bsl_pindetect_enabled=False
por_reset_delay=long
rstout_por_state=high
uart2_passthrough=False
uart2_pin_mode=normal
cpu_core_voltage=unknown
Loading flash: 3584 bytes (Intel HEX)
Trimming frequency: 11.057 MHz
Switching to 19200 baud: done
Erasing flash: done
Writing flash: 3648 Bytes [00:03, 1038.72 Bytes/s]
Finishing write: done
Setting options: done
Target UID: F51F44B103089C
Disconnected!
`

[zerog2k]

Can you share schematics? It’s the only way I can see what is different.

[Kobbe1]

I have another one coming from banggood, will scan schematic once I have it. Is there a way to backup the original firmware or is this locked?

[zerog2k]

No, no known way to readout flash - the STC uart bootloader rom does not support reading (by design).

[Kobbe1]

Hi there,
the new kit arrived.
Guess what - it is a different hardware altogether. I will close this issue here, the old clock has a hardware issue I am convinced now.

I will open a new one as also the new kit gives me trouble, this clock drives me crazy :)