Help with DS18B20 program

[KVLV]

Hi,
I just copied the code that Cocacolakid posted, modified a bit, compile the program with version 2.46 of PbP, program run ok. When compile with version 2.50 of PBP, program just stuck/stop at "hello". Both case, I use PM assembler. The chip i am using is pic16f876 @20MHz.

I don't know if v2.50pbp has problem or with the 1-wire commands (onwin and owout).

i attached the file below for checking.

If anyone has time, please confirm/verify/correct me if i did anything wrong.

Thanks,

[Archangel]

Hi,
I just copied the code that Cocacolakid posted, modified a bit, compile the program with version 2.46 of PbP, program run ok. When compile with version 2.50 of PBP, program just stuck/stop at "hello". Both case, I use PM assembler. The chip i am using is pic16f876 @20MHz.

I don't know if v2.50pbp has problem or with the 1-wire commands (onwin and owout).

i attached the file below for checking.

If anyone has time, please confirm/verify/correct me if i did anything wrong.

Thanks,

Hi KVLV,
when you port from one PIC to Another, be aware the configs are likely different, your copied code compiles in MPASM perfectly with the configs commented out as you have them, included they will not compile as the 16f88 chip has different configs I E config1, config2, the 16f876.inc file has the default configs built in which must be commented out with a ; if you wish not to use them, if you do this then you may include your own config like:
@ __CONFIG _CP_OFF & _DEBUG_OFF & _WRT_ENABLE_OFF & _CPD_OFF & _LVP_OFF & _BODEN_ON & _PWRTE_ON & _WDT_ON & _HS_OSC

and it will compile in VER 2.50

[KVLV]

Joe,
maybe I rephrase it.
The program I have attached compile ok with v2.46 and v2.50, no error. I use pic16f876.
when compile using version 2.46 of pbp, the program is running ok when downloaded to the chip using bootloader. it displays/transmit the temperature reading to the lcd/terminal ok.

the problem only when compile using v2.50 of pbp, the program (hex file) downloaded/program to the chip using bootloader, the program cannot run/stop/freeze.

i commented out the configurations because it is not needed when using bootloader (i think it is ok to do so).

[Archangel]

Joe,

i commented out the configurations because it is not needed when using bootloader (i think it is ok to do so).

Without the config statements your program uses the default config statement located in the .inc file of the same name/number as your chip, in this case 16f876 , and the default is for XT_OSC not HS_OSC, and could account for your program's failure to launch as it is set to run at 20 MHZ, the PIC OSC requires more power to operate at 20 than at 4 and the HS_OSC provides that power.
JS

[KVLV]

thanks Joe, lets me try again. and post if any result.

[CocaColaKid]

I can't understand why the program would work when compiled with 2.46 but not with 2.50. I don't believe the config fuses are the problem as I believe they are not used with a bootloader and are simply not implemented at loading time. Unfortunately though I am running 2.45 myself so I won't be of much more help on this issue.