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Forum Index : Microcontroller and PC projects : Multiple onewire devices
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TassyJim Guru  Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
The CMM2 has the TEMPR function. It works for situations where there is only one device connected to a pin. This is the usual condition but there are times when a string of multiple devices is desired. A few years ago jman produced a subroutine to enumerate multiple devices but it was restricted to 3 devices. This seems to have been a common problem with Arduino code as well. This function ow_search() has been tested with 5 devices on both the CMM2 and micromite. 5 was all I could find but I am reasonably confident that it will work for any number. It has two parameters: Pin number and flag. If flag is non zero, the search function is reset allowing a fresh search to be done. Normally, flag can be omitted and if it’s the first time the function is run, it starts a full search without the need for a reset. If the search is repeated until an empty string is returned, this indicates that all devices have been found and the function is reset ready for another search. The second function, ow_Tempr() takes 3 parameters. Pin number, bit resolution and romcode as a string. If bit number is omitted, the resolution is set to the default of 10 bits If romcode$ is omitted, it assumes that there is only one device. Just like the built-in TEMPR function, running the function with multiple devices attached will give wrong results with no error message. Multiple devices require a romcode$ The ow_Tempr() function should also work with CS1820 and DS18S20 devices. I don’t have any to test. As well as the two functions, there is a short test program to demonstrate the functions. With my 5 devices connected 16 -0.25 283053F3050000E4 75 19 283053F3050000E4 149 18.75 283053F3050000E4 297 18.875 283053F3050000E4 594 18.8125 2862D8F105000018 75 18 2862D8F105000018 150 18 2862D8F105000018 300 18 2862D8F105000018 598 17.9375 28CAA0F20500003E 75 18 28CAA0F20500003E 149 18 28CAA0F20500003E 298 18 28CAA0F20500003E 596 17.875 28AA42A3411401D5 90 18 28AA42A3411401D5 180 17.75 28AA42A3411401D5 359 17.625 28AA42A3411401D5 719 17.625 2877FCF10500004F 74 18 2877FCF10500004F 149 18.25 2877FCF10500004F 298 18.25 2877FCF10500004F 595 18.125 The first two lines are results from TEMPR and my function with no romcode$ Both are wrong and will vary depending on the combination of devices attached. This is followed by searching for rom codes and the retrieving the temperature at each resolution. It also times the function as this can be an indication of suspect chips. The odd one out is my recent purchase from Jaycar. The functions: ' one-wire search and read mutiple devices on one pin ' also should read DS18S20 and DS1820 as well as DS18B20 ' tested on CMM2 and micromite ' TassyJim August2020 ' search based on code by jman and maximite source code ' OPTION EXPLICIT DIM NextRomCode$ DIM INTEGER t,b, pinN = 42 DIM FLOAT tp PRINT TEMPR(pinN) PRINT ow_Tempr(pinN) DO NextRomCode$ = ow_search(PinN) IF NextRomCode$<>"" THEN FOR b = 9 TO 12 t = TIMER tp = ow_Tempr(PinN,b,NextRomCode$) PRINT NextRomCode$;" ";INT(TIMER-t-30);" ";tp NEXT b ENDIF LOOP UNTIL NextRomCode$ = "" ' ow_search() given pin number, returns all onewire devices found one at a time, ' as a string. After the last device, the next call will return an empty string. ' If there are no devices found "None found" is returned. ' Anything other than zero for the second parameter will cause the counter to reset, ' retrieving the first device FUNCTION ow_search(PinNbr AS INTEGER,f%) AS STRING LOCAL INTEGER i, RomNum, rom_byte_mask, id_bit, cmp_id_bit, Last_zero LOCAL INTEGER search_direction, id_bit_number LOCAL RomCode$ STATIC INTEGER LastDeviceFlag, LastDiscrepancy, last_RomNum IF f% <> 0 THEN ' reset for a new search last_RomNum = 0 LastDeviceFlag = 0 LastDiscrepancy = 0 'LastFamilyDiscrepancy = 0 ENDIF ONEWIRE RESET PinNbr IF LastDeviceFlag = 1 THEN RomCode$ = "" last_RomNum = 0 LastDeviceFlag = 0 LastDiscrepancy = 0 'LastFamilyDiscrepancy = 0 ELSE RomNum = 0 id_bit_number = 1 rom_byte_mask = 1 last_zero = 0 ONEWIRE WRITE PinNbr,1,1,&HF0 'Send the Search ROM command (FO) DO ONEWIRE READ PinNbr, 4 , 2, id_bit, cmp_id_bit 'Get response from device IF (id_bit = 1 AND cmp_id_bit = 1) THEN ' shouldn't happen LastDeviceFlag = -1 EXIT DO ENDIF IF id_bit <> cmp_id_bit THEN search_direction = id_bit ' no conflict IF ((id_bit = 0) AND (cmp_id_bit = 0)) THEN ' conflict IF id_bit_number = LastDiscrepancy THEN 'id_bit_number = LastDiscrepancy then take "1" path search_direction = 1 ELSEIF id_bit_number > LastDiscrepancy THEN 'id_bit_number > LastDiscrepancy then take the "0" path search_direction = 0 ELSE ' id_bit_number < LastDiscrepancy then take same path as last time IF (last_RomNum AND rom_byte_mask) > 0 THEN search_direction = 1 ELSE search_direction = 0 ENDIF ENDIF IF search_direction = 0 THEN Last_zero = id_bit_number 'If last_zero < 9 Then LastFamilyDiscrepancy = last_zero ENDIF ENDIF ' add bit to rom code or leave at zero if search_direction = 0 IF search_direction = 1 THEN RomNum = RomNum OR rom_byte_mask ONEWIRE WRITE PinNbr,4,1,search_direction ' send 1 or 0 as search direction id_bit_number = id_bit_number+1 ' increment id_bit_number rom_byte_mask = rom_byte_mask << 1 LOOP UNTIL id_bit_number > 64 'Check for next bit IF LastDeviceFlag = -1 THEN LastDeviceFlag = 1 RomCode$ = "None found" ELSE LastDiscrepancy = last_zero IF LastDiscrepancy = 0 THEN LastDeviceFlag = 1 last_RomNum = RomNum RomCode$ = "" FOR i = 1 TO 8 RomCode$ = RomCode$ + HEX$((RomNum AND &hFF),2) RomNum = RomNum>>8 NEXT i ENDIF ENDIF ow_search = RomCode$ END FUNCTION ' bit (9-12) is optional and defaults to 10 ' probe$ is optional if only one probe attached ' probe$ format = "2862D8F105000018" ' time taken is ~30mS plus conversion time FUNCTION ow_Tempr(PinNbr AS INTEGER, bit AS INTEGER, probe$) AS FLOAT LOCAL FLOAT T1 LOCAL INTEGER t, n, power, romcode, Tconv LOCAL INTEGER c1,c2,c3,c4,c5,c6,c7,c8 LOCAL INTEGER d1,d2,d3,d4,d5,d6,d7,d8 IF bit = 0 THEN bit = 10 ELSEIF bit < 9 THEN bit = 9 ELSEIF bit > 12 THEN bit = 12 ENDIF Tconv=750 ONEWIRE RESET PinNbr IF MM.ONEWIRE = 0 THEN ' no device T1 = 1000 ELSE ONEWIRE WRITE PinNbr, 1,2,&hcc, &hb4 ONEWIRE READ PinNbr,4,1,power IF probe$ = "" THEN ' romcode not specified so go get it. ONEWIRE WRITE PinNbr,1,1,&h33 'read ROM code ONEWIRE READ PinNbr,0,8,c1,c2,c3,c4,c5,c6,c7,c8 ELSE romcode = VAL("&h"+probe$) c8 = romcode AND &hFF romcode = romcode >> 8 c7 = romcode AND &hFF romcode = romcode >> 8 c6 = romcode AND &hFF romcode = romcode >> 8 c5 = romcode AND &hFF romcode = romcode >> 8 c4 = romcode AND &hFF romcode = romcode >> 8 c3 = romcode AND &hFF romcode = romcode >> 8 c2 = romcode AND &hFF romcode = romcode >> 8 c1 = romcode AND &hFF ENDIF IF c1=34 OR c1=40 THEN n = ((bit-9)<< 5) + 31 ' set resolution config byte ONEWIRE WRITE PinNbr,1,9,&h55,c1,c2,c3,c4,c5,c6,c7,c8 ONEWIRE WRITE PinNbr,0,4, &h4e , &hFF,&hFF,n ENDIF ONEWIRE WRITE PinNbr,1,9,&h55,c1,c2,c3,c4,c5,c6,c7,c8 IF power = 0 THEN ONEWIRE WRITE PinNbr,8,1, &h44 'apply strong pullup for passive ELSE ONEWIRE WRITE PinNbr,0,1, &h44 ENDIF 'read external when bit goes hi, for parasitic just wait IF power = 0 THEN PAUSE Tconv ELSE t = TIMER DO IF TIMER - t > 1000 THEN T1 = 1001 EXIT DO ENDIF ONEWIRE READ PinNbr, 4, 1, n ' conversion done? LOOP UNTIL n = 1 'print int(timer - t);" "; ENDIF ENDIF IF T1 < 1000 THEN 'read scratchpad ONEWIRE WRITE PinNbr,1,9,&h55,c1,c2,c3,c4,c5,c6,c7,c8 ONEWIRE WRITE PinNbr,0,1,&hbe ' command read data ONEWIRE READ PinNbr,2,8,d1,d2,d3,d4,d5,d6,d7,d8 IF c1=34 OR c1=40 THEN ' DS18S22 or DS18B20 t= d1+(d2<<8) t = t AND (&hFFFF <<(12-bit)) IF t > 32767 THEN t = t - 65536 T1 = t/16 ELSEIF c1=16 THEN ' DS18S20 or DS1820 t= d1+(d2<<8) IF t > 32767 THEN t = t - 65536 ' T1 = t/2 ' 9 bit T1 = (t>>1) - 0.25 + (d8-d7)/d8 ' using extended precision data ELSE T1 = 1002 ENDIF ENDIF ow_Tempr = T1 END FUNCTION Jim VK7JH MMedit |
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CaptainBoing Guru Joined: 07/09/2016 Location: United KingdomPosts: 2170 |
Fantastic - good work Jim  |
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| Volhout Guru Joined: 05/03/2018 Location: NetherlandsPosts: 5089 |
I was always curious how this would work, the enumeration of multiple devices in onewire. Good to see it in action... Nice work TassyJim! PicomiteVGA PETSCII ROBOTS |
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Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
Hi Jim Decided it was time I checked this out. I connected 4 x DS18B20's to a 28 pinner, pin 2 running 5.0408 It didn't like the STATIC INTEGER in the first function so I made it a global INTEGER. I don't know how this affects things. It worked but all the times are coming out the same as per below. I'm using a 2k7 resistor RUN [17:08:50] [17:08:51] 22.5 [17:08:51]-0.25 [17:08:51] [17:08:52]28900381070000CD 760 23 [17:08:53]28900381070000CD 761 22.75 [17:08:54]28900381070000CD 760 22.75 [17:08:55]28900381070000CD 760 22.75 [17:08:55] [17:08:56]28EE348107000093 760 22.5 [17:08:56]28EE348107000093 760 22.5 [17:08:57]28EE348107000093 760 22.625 [17:08:58]28EE348107000093 761 22.625 [17:08:58] [17:08:59]28EEF78007000070 761 22.5 [17:09:00]28EEF78007000070 760 22.75 [17:09:00]28EEF78007000070 760 22.75 [17:09:01]28EEF78007000070 760 22.6875 [17:09:01] [17:09:02]28750281070000C2 760 22.5 [17:09:03]28750281070000C2 760 22.75 [17:09:04]28750281070000C2 760 22.75 [17:09:05]28750281070000C2 760 22.625 [17:09:05] [17:09:05] [17:09:05]> Now to sit down & work out what exactly how the program works. Brian ChopperP |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
STATIC or GLOBAL shouldn't make any difference. All the same time indicates that you are using parasitic power. When you are on parasitic power and multiple devices, it is safest to wait for the maximum time. Other wise, you would have to work out which devices run at what speed and then you might be able to shorten the time. Slow and steady wins the race. Or use 3 wires. Jim VK7JH MMedit |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
I'm using 3 wires as per the manual. Separate power, signal & return wires. I assume all devices are in parallel with the one resistor. Brian ChopperP |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
In that case, either: my code thinks that one or more of your sensors is in passive mode. or your sensors can't change resolution. You could try one at a time and compare the time with the builtin function for various bit resolution. Jim VK7JH MMedit |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
OK, will have a play. Thanks Jim Brian ChopperP |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
Jim Checked the 4 sensors individually for the 4 modes from the MMEdit Chat command line. They seem to be working OK with my setup. (Must be your program  )[18:33:51]tempr start 2,0: timer = 0: ? tempr(2): ? timer [18:33:51] 22 [18:33:51] 104 [18:33:54]> tempr start 2,1: timer = 0: ? tempr(2): ? timer [18:33:58] 22.5 [18:33:58] 204 [18:34:00]> tempr start 2,2: timer = 0: ? tempr(2): ? timer [18:34:05] 22.375 [18:34:05] 404 [18:34:07]> tempr start 2,3: timer = 0: ? tempr(2): ? timer [18:34:12] 22.375 [18:34:12] 804 [18:34:12]> tempr start 2,0: timer = 0: ? tempr(2): ? timer [18:36:19] 24 [18:36:19] 104> [18:36:22]> tempr start 2,1: timer = 0: ? tempr(2): ? timer [18:36:27] 23.75 [18:36:27] 204 [18:36:29]> tempr start 2,2: timer = 0: ? tempr(2): ? timer [18:36:35] 23.5 [18:36:35] 404 [18:36:38]> tempr start 2,3: timer = 0: ? tempr(2): ? timer [18:36:44] 23.25 [18:36:44] 804 [18:36:44]> tempr start 2,0: timer = 0: ? tempr(2): ? timer [18:37:27] 24.5 [18:37:27] 104 [18:37:27]> tempr start 2,1: timer = 0: ? tempr(2): ? timer [18:37:34] 24.25 [18:37:34] 204 [18:37:34]> tempr start 2,2: timer = 0: ? tempr(2): ? timer [18:37:42] 23.75 [18:37:42] 404 [18:37:42]> tempr start 2,3: timer = 0: ? tempr(2): ? timer [18:37:47] 23.4375 [18:37:47] 804 [18:37:47]> tempr start 2,0: timer = 0: ? tempr(2): ? timer [18:38:12] 25.5 [18:38:12] 104 [18:38:12]> tempr start 2,1: timer = 0: ? tempr(2): ? timer [18:38:17] 25 [18:38:17] 204 [18:38:17]> tempr start 2,2: timer = 0: ? tempr(2): ? timer [18:38:21] 24.625 [18:38:21] 404 [18:38:21]> tempr start 2,3: timer = 0: ? tempr(2): ? timer [18:38:25] 24.375 [18:38:25] 804 Interesting exercise. Brian ChopperP |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
And what happens with one sensor with my program? VK7JH MMedit |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
One sensor with your prog. [22:05:13]RUN [22:05:13] [22:05:13] 22.75 [22:05:14] 22.75 [22:05:14] [22:05:14]28900381070000CD 761 23 [22:05:15]28900381070000CD 761 22.75 [22:05:16]28900381070000CD 760 22.75 [22:05:17]28900381070000CD 760 22.75 [22:05:17] [22:05:17] [22:05:17]> BTW, I updated the firmware & reinstated STATIC. Made no difference to the readings as can be seen. Brian ChopperP |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
One sensor with your prog. [22:05:13]RUN [22:05:13] [22:05:13] 22.75 [22:05:14] 22.75 [22:05:14] [22:05:14]28900381070000CD 761 23 [22:05:15]28900381070000CD 761 22.75 [22:05:16]28900381070000CD 760 22.75 [22:05:17]28900381070000CD 760 22.75 [22:05:17] [22:05:17] [22:05:17]> BTW, I updated the firmware & reinstated STATIC. Made no difference to the readings as can be seen. Brian ChopperP |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
One sensor with your prog. [22:05:13]RUN [22:05:13] [22:05:13] 22.75 [22:05:14] 22.75 [22:05:14] [22:05:14]28900381070000CD 761 23 [22:05:15]28900381070000CD 761 22.75 [22:05:16]28900381070000CD 760 22.75 [22:05:17]28900381070000CD 760 22.75 [22:05:17] [22:05:17] [22:05:17]> BTW, I updated the firmware & reinstated STATIC. Made no difference to the readings as can be seen. Brian ChopperP |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
One sensor with your prog. [22:05:13]RUN [22:05:13] [22:05:13] 22.75 [22:05:14] 22.75 [22:05:14] [22:05:14]28900381070000CD 761 23 [22:05:15]28900381070000CD 761 22.75 [22:05:16]28900381070000CD 760 22.75 [22:05:17]28900381070000CD 760 22.75 [22:05:17] [22:05:17] [22:05:17]> BTW, I updated the firmware & reinstated STATIC. Made no difference to the readings as can be seen. Brian ChopperP |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
OK, 4 posts ???? ChopperP |
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Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3292 |
Unfortunately using the following to measure the conversion time is meaningless: tempr start 2,0: timer = 0: ? tempr(2): ? timer This is because MMBasic waits for a fixed time (as specified in the DS18B20 data sheet) for the conversion. It does not query the sensor to figure out if it has completed early. This applies if TEMPR START was or was not used. The TEMPR() function was intended for casual users who just wanted to get a temperature. For more sophisticated applications you can use the ONEWIRE commands as TassyJim has done and they allow you to explore all the complexities of the DS18B20. Edit: It has just occurred to me that if a clone DS18B20 takes longer than the datasheet time MMBasic will not be able to read its result (because it is still converting when MMBasic checks). Hmmm... Geoff Edited 2020-08-29 22:37 by Geoffg Geoff Graham - http://geoffg.net |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
Hi Geoff Wouldn't it still give an indication that the conversions were done within the specified time according to TEMPR START or am I not understanding this correctly? Brian ChopperP |
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| Geoffg Guru Joined: 06/06/2011 Location: AustraliaPosts: 3292 |
I am not quite sure what you are asking but, to be clear, this is what happens: When you use the function TEMPR() it: - Triggers the conversion. - Starts a timer and waits for it to finish. - Then queries the DS18B20 and returns its reading. When you use the command TEMPR START it: - Triggers the conversion. - Starts a timer who's value depends on the specified accuracy. When you later use the function TEMPR() it: - Checks the timer and if not finished it will wait for it to finish. - Then queries the DS18B20 and returns its reading. The DS18B20 can be repeatedly queried to check if it has finished but I had issues with getting that to work reliably so I opted for a simple timer. Remember, you can always use the ONEWIRE commands to do the more complicated stuff like this. For example (this is untested): ' use a defined function to get the temperature ' The sensor is connected to the pin 18 Print "The temperature is:" GetTemp(18) ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' ' Function to get the temperature from a Dallas DS18B20. ' The DS18B20 is connected to the pin specified by PinNbr ''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''' Function GetTemp (PinNbr) Local T1, T2, b, t OneWire Reset PinNbr ' reset OneWire Write PinNbr, 1, 2, &hcc, &h44 ' start conversion Pause 100 t = Timer Do If Timer - t > 1000 Then Error "Sensor not responding" OneWire Read PinNbr, 4 , 1 , b ' conversion done? Loop Until b = 1 OneWire Write PinNbr, 1, 2, &hcc, &hbe ' command read data OneWire Read PinNbr, 2, 2, T1, T2 ' get the data GetTemp = ((T2 And &b111) * 256 + T1) / 16 If T2 And &b1000 Then GetTemp = -GetTemp ' adjust if negative End Function It might be worth revisiting this to see if I can poll the DS18B20 reliably - I will add that to the todo list for the next version. Another thing that I would like to do is to allow interrupts to be serviced while waiting. Geoff Edited 2020-08-30 00:38 by Geoffg Geoff Graham - http://geoffg.net |
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| TassyJim Guru Joined: 07/08/2011 Location: AustraliaPosts: 6283 |
Try again. (I copy and pasted something that had a text string that the forum didn't like) Try changing your pullup resistor to 4.7k. WE might as well go with the datasheet recommendation. AT about line 140 of my code, I check to see if we are on parasitic power. Try adding a line PRINT "Power= ";power after ONEWIRE WRITE PinNbr, 1,2,&hcc, &hb4 ONEWIRE READ PinNbr,4,1,power From the datasheet: Jim VK7JH MMedit |
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| Chopperp Guru Joined: 03/01/2018 Location: AustraliaPosts: 1097 |
@TJ Changed to a 4k7 & added PRINT "Power= ";power; ONEWIRE WRITE PinNbr, 1,2,&hcc, &hb4 ONEWIRE READ PinNbr,4,1,power PRINT "Power = ";power " "; First printout is with PARASITIC (2 wire) power & the second Normal power. No difference [08:38:22]RUN [08:38:22] [08:38:22] 18.5 [08:38:22]Power = 0 -0.25 [08:38:23] [08:38:23]Power = 0 28900381070000CD 761 18.5 [08:38:24]Power = 0 28900381070000CD 762 18.5 [08:38:25]Power = 0 28900381070000CD 762 18.375 [08:38:26]Power = 0 28900381070000CD 761 18.4375 [08:38:27] [08:38:27]Power = 0 28EE348107000093 761 18.5 [08:38:27]Power = 0 28EE348107000093 762 18.75 [08:38:28]Power = 0 28EE348107000093 761 18.75 [08:38:29]Power = 0 28EE348107000093 761 18.75 [08:38:30] [08:38:30]Power = 0 28EEF78007000070 761 18.5 [08:38:31]Power = 0 28EEF78007000070 762 18.75 [08:38:32]Power = 0 28EEF78007000070 761 18.625 [08:38:32]Power = 0 28EEF78007000070 761 18.625 [08:38:33] [08:38:33]Power = 0 28750281070000C2 762 18.5 [08:38:34]Power = 0 28750281070000C2 762 18.75 [08:38:35]Power = 0 28750281070000C2 761 18.625 [08:38:36]Power = 0 28750281070000C2 761 18.5625 [08:38:36] [08:38:36] [08:38:36]> RUN [08:39:38] [08:39:38] 18 [08:39:38]Power = 0 -0.25 [08:39:39] [08:39:39]Power = 0 28900381070000CD 761 19 [08:39:40]Power = 0 28900381070000CD 761 19 [08:39:41]Power = 0 28900381070000CD 761 19 [08:39:41]Power = 0 28900381070000CD 761 18.9375 [08:39:42] [08:39:42]Power = 0 28EE348107000093 761 18.5 [08:39:43]Power = 0 28EE348107000093 762 18.75 [08:39:44]Power = 0 28EE348107000093 761 18.75 [08:39:45]Power = 0 28EE348107000093 761 18.75 [08:39:46] [08:39:46]Power = 0 28EEF78007000070 761 18.5 [08:39:46]Power = 0 28EEF78007000070 762 18.75 [08:39:47]Power = 0 28EEF78007000070 761 18.75 [08:39:48]Power = 0 28EEF78007000070 761 18.75 [08:39:49] [08:39:49]Power = 0 28750281070000C2 762 18.5 [08:39:50]Power = 0 28750281070000C2 762 18.75 [08:39:51]Power = 0 28750281070000C2 761 18.75 [08:39:51]Power = 0 28750281070000C2 761 18.6875 [08:39:52] [08:39:52] [08:39:52]> Brian ChopperP |
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