Tiny841 analogRead( PA2) does not work?

[Tigeruno]

I'm new coding this chip, I do have diyBMSv4 code for reference and data sheet.
Trying to use PA2 (RX serial pin) as analog input. I checked voltages at the LDR and they show proper changes with light changes.

void readLDR() // read ldr and choose to open or close door
{ // depends on current time and ldr
uint16_t sumVal = 0;
for (byte i = 0; i < 10; i++)
sumVal += analogRead(A2); // Get current light
val = sumval / 10;

Blink (green, 2);
// Blink (blue, 2);

if (val > 9) // this never happens regardless of brightness of light
Blink(blue, byte (val / 10));

if (DoorFlag && val > ldrMax) // if door is already open don't try to open again

[SpenceKonde]

I don't think there should be any problem there, but I wasn't immediately successful confirming that finding the mapping of An constants to ADC channels is in fact correct; the 1634/841/441/828 core is pretty much entirely incomprehensible. That second sub-core is being scrapped and made a normal implementation in 2.0.0 (the next planned release), which will be easier to follow and where analogRead() will be able to interpret pin numbers... [all of that plumbing is completely replaced]

Beyond that, I'd need to see wiring to comment further.

[Tigeruno]

Wiring, I'm using a discarded diyBMSv4 module board, since it already has most of pads populated. I also just tried LDR on PB2, same result. I tried blinking my LED number of Value, nothing.
Both are: VCC -> LDR <- (PB2 or PA2) <- 10k -> GND.

P.S. Look forward to ver 2.0.0, and hoping for I2C master so I can use my DS3231!

[SpenceKonde]

There could very well be a pinmapping issue with the An constants, everything about how analogRead() interprets pin numbers is fucked up and inconsistent on ATTinyCore in current released versions, and that shitshow was a big psrt of the motivation for many changes in 2.0.0 (all of the variant files were recreated de novo for 2.0.0). I think analogRead(number) where `number` is the number after ADC on that pin on my pinout charts is guaranteed to work currently, and guaranteed not to work in 2.0.0 when behavior will mirror that of my other cores). Anything other than that I don't claim to know off hand and don't want to look back at; it's non-trivial and that part of the work for 2.0.0 was long since done; I'm not confident I could tell you what behavior was expected, sadly, at least not without lots of study. Like i said, it is/was a shitshow. I started maintaining ATTinyCore long before I was qualified to do so, and then had to stay the course to keep from breaking compatibility, which wasn't avoidable if I wanted it to be consistent or sane. Hence why the next release involves incrementing the major version.... Anyway Trace out the board and draw out the schematic, so you can be sure there isn't some unexpected connection, too. I'd connect a serial adapter and try to get some debugging output...The 841's have real serial ports so Serial works normally and doesn't suck like it does for parts with only software serial.

…

On Sat, Sep 18, 2021 at 1:51 PM Tigeruno ***@***.***> wrote: Wiring, I'm using a discarded diyBMSv4 module board, since it already has most of pads populated. I also just tried LDR on PB2, same result. I tried blinking my LED number of Value, nothing. Both are: VCC -> LDR <- (PB2 or PA2) <- 10k -> GND. [image: diyBMSv4module] <https://user-images.githubusercontent.com/49213224/133897916-f3bd3d62-d7b4-4f97-a965-434b142b1378.jpg> — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#609 (reply in thread)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/ABTXEW3PP3ONGHM2HGGGC6DUCTGTBANCNFSM5EJKSYCQ> . Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub>.

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[Tigeruno]

Okay, after much thrashing about with program code and soft serial which didn't work either. I moved all the necessary components to another module PCB, BINGO! Something indeed was wrong with the board.
analogRead() works as expected. Sorry for the doubt that my post raised.

Now: I2C master to get the RTC on board the project.
Thanks for the support.

P.S. Just reread your last post, real SERIAL, my bad, will get that working. Blinking lights help but ..... rather have serial.