Working on 1-Wire SearchROM Method

CJMJ

I'm working on a 1-Wire SearchROM method in Spin2. I understand how the algorithm works. I am just working out the code. Before I expend any more energy on this task, does anyone know if a solution already exists in Spin2?

JonnyMac

I am also working on that. I did it with the BASIC Stamp 2 nearly 20 years ago, but coding in Spin and BASIC is different, hence it's not a easy port. There are C examples available that would probably translate very easily -- I was trying it myself, first.

CJMJ

I was using your code to read my DS18B20s and saw you hadn't coded the SearchROM method yet. I thought I would give you a hand. You seem to have a lot on your plate these days. But I can move on to the next task on my list and look forward to your solution.

Do you sleep?

The only person I ever met that is as prolific as yourself was Dean Kamen and he didn't have a bedroom in his enormous house. It was rumored that it was the only room in the house that was off limits [besides the guest quarters] and was hidden behind a bookshelf in his library.

JonnyMac

Do you sleep?

I try to get enough. Being a bachelor in the age of shutdowns means I spend most of my waking hours at my computer.

Thank you for the kind words. I enjoy this stuff, and want to keep sharp for when client work does come.

Peter Jakacki

There is code written in Tachyon years ago by @MJB to handle this complicated searchROM algorithm. It was quite verbose and would list out the type of chip etc.
Any use?
If I can avoid multidrop 1w then I do, preferring to condition and stretch the I2C bus with cheap and precise sensors instead or RS485 if need be.

Stephen Moraco

In case you don't have search working yet...

I'm posting the one that I'm using for P2. This is in .spin2 and it is a file used in addition to Jon's excellent jm_1-wire.spin2 access routines.

This supports:

• searching for all devices on the wire
• searching for devices of a single-family id on the wire
• getting a list of family IDs seen on the wire
• returning the first N device IDs on the wire

Here's the demo output from my 5 x DS18B20's in my setup:

+ searchAll(0x00002BEC, 2)
+ owFirst()
-- searchAll()  RET=2, found=5
scanROM count = 2
** S/N Buffer:
  0x00002BEC: 0x28 0x1C 0xAB 0xD4 0x58 0x20 0x01 0xB5  0x28 0xF6 0x40 0xBA 0x58 0x20 0x01 0x7C 
  0x00002BFC: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00  0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
  0x00002C0C: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00  0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 

+ searchAll(0x00002BEC, 10)
+ owFirst()
-- searchAll()  RET=5, found=5
scanROM count = 5
** S/N Buffer:
  0x00002BEC: 0x28 0x1C 0xAB 0xD4 0x58 0x20 0x01 0xB5  0x28 0xF6 0x40 0xBA 0x58 0x20 0x01 0x7C 
  0x00002BFC: 0x28 0x83 0x8D 0xE9 0x58 0x20 0x01 0x91  0x28 0x27 0x6E 0xC4 0x58 0x20 0x01 0x68 
  0x00002C0C: 0x28 0x37 0x17 0xD0 0x58 0x20 0x01 0x9B  0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 
S/N #1 28 1C AB D4 58 20 01 B5 
S/N #2 28 F6 40 BA 58 20 01 7C 
S/N #3 28 83 8D E9 58 20 01 91 
S/N #4 28 27 6E C4 58 20 01 68 
S/N #5 28 37 17 D0 58 20 01 9B 
- Found 5 Devices on wire
- Found 1 family IDs
  -- FamilyID 0x28: 5 device(s)

+ searchFamily(0x28, 0x00002BEC, 10)
+ owTargetSetup(0x28)
-- searchFamily()  RET=5, found=5
scanROM-Family $28 finds 5 devices

+ searchFamily(0x45, 0x00002BEC, 10)
+ owTargetSetup(0x45)
-- searchFamily()  RET=0, found=5
scanROM-Family $45 finds 0 devices

Enjoy!

EDIT: i replaced my file with a newer version which contains an updated 1-wire object from Jon. (his latest)