Could not set / display time with HW_MODEL_D

[vargham]

Temperature and ligth measurement are working. Display is OK. Button 1 and 2 are working.

Time setting and display is not working. There is a 1F 7F constant display instead of time.

[zerog2k]

Is it working with the changes you made?

[vargham]

Everything is fine, except the clock.

[zerog2k]

I’m wondering if the data and clock lines of ds1302 have external pull-up resistors on them? I recall some issue where we had to play with the pin mode registers to get pull-up (if so might check data sheet on this. )

[vargham]

RTC data IO has 7k6 pull-up.

[vargham]

Changed DS1302's CE to open-drain output

    //M1 M0
    // 0 0 Bidirectional
    // 0 1 Push-Pull
    // 1 0 Input
    // 1 1 Open-drain
    //          IO CE CK
    P1M1 = 0b00000010;
    P1M0 = 0b00000010;

Constant 1F 7F has been changed to constant 00 00, but still could not set time.

[zerog2k]

1. Did the clock work with the stock firmware before flashing to this custom one?
2. Datasheet says ds1302 signal pins have internal 40k pulldown, so if there are no pullups on CE & CLK you may want to try setting pinmode to push-pull, and on IO since it has pullup, open-drain (or quasi-bidirectional).
   Do you have access to a scope or logic analyzer to see what is happening on the ds1302 signal lines?

[vargham]

1. Yes, the original firmware worked.
2. Changed pin mode and everything is the same.
3. I will check it with logic analyzer.

[vargham]

I checked. CE and CLK is always low. Only IO is changing.

[vargham]

OK, I fixed.

1. All DS1302 pins set to bidirectional.
2. #if defined HW_MODEL_D does not work at the DS section of hwconfig, so the wrong pins have been used. Just commented out to test. I will clean that part.

[zerog2k]

Curious if you had to explicitly set P1M0 and P1M1 registers to 0. I understand from datasheet that this should be the default, and I don't recall where we were setting these otherwise.

[Madhava-04]

I also get this error 1F 7F. Please help me by sending Hex file because I dont know how to compile. I have YD-020 model kit as per attached file

[pctong]

Here is a link to the STC15F204EA new firmware for Madhava-04 to try on your new model. the only difference is your light sensor is on P1.3 but my ZM-907AA is on P1.5. If your test is ok, I can recompiled the firmware for P1.3
https://github.com/pctong/STC15F204EA-clock