owout not working on 16f77 ? (hangs)

[nomad]

no matter what I do, I cannot get owout to work on these 16f77's.

works on 12f683 (used to read the serial numbers)
tried it on other 16f's and always worked perfectly.

this works on 16f917:


x var byte

clear
start:
while x < 50
x = x + 1
debug "looping",dec2 x,$0d,$0a
wend
x=0

debug "attempting one wire out" ,$0d,$0a
owout portb.2, 1, [$CC, $4E, 0, 0, %01111111] 'set resolution of sensor
debug "passed one wire out" ,$0d,$0a
goto start


but the same thing on 16f77 will hang at the owout command no matter what I do.
checked ports for analog/comparators (adcon1/ccp1con/ccp2con), switched to all different ports, even the same one driving lcd, different boards,etc..
I'm starting to think there's some glitch that just makes it not compatible with 16f77?


I would just use one of the other pics, but I have these old head units (lcd, buttons, etc) that
have 16f77's on the board.

stripped down to just this:


@ __CONFIG _BODEN_ON & _CP_OFF & _PWRTE_ON & _WDT_ON & _HS_OSC

DEFINE OSC 16

ADCON1 = 7


DEFINE LCD_DREG PORTD
DEFINE LCD_DBIT 0
DEFINE LCD_RSREG PORTC
DEFINE LCD_RSBIT 3
DEFINE LCD_EREG PORTC
DEFINE LCD_EBIT 5
DEFINE LCD_BITS 8
DEFINE LCD_LINES 4
DEFINE LCD_COMMANDUS 2000
DEFINE LCD_DATAUS 50


start:
LCDOUT $fe,1
Pause 750 ' Wait for LCD to startup
'lcd width guide "12345678901234567890"
Lcdout $fe,1, " "
LCDOUT $fe,$94," "
LCDOUT $FE,$C0," Fridge Alert! " ' goto start line 3
lcdout $fe,$D4," "
pause 5000
LCDOUT $FE,1

pause 500
lcdout $FE,1,"set resolution owout"
'OWOUT portb.2, 1, [$CC, $4E, 0, 0, %01111111] 'set resolution of sensor
lcdout $FE,$D4,"success!"
pause 5000
goto start


stops right after displaying "set resolution owout"..
nothing, just dead stops.
(here i commented out the owout line and it proceeds to success etc..)

Any ideas?

[tasmod]

Not used it before but according to PBP manual shouldn't the OWOUT mode be set as say %010 ? Send reset pulse after data.

OWOUT PORTB.2,%010 , [$CC, $4E, 0, 0, %01111111]

[nomad]

using it to communicate with ds18b20 temperature sensors. I've used this mode for them on other pics and it's worked fine.
can use decimal notation instead of binary (1 for %00000001, 2 for %00000010, etc) and i've tried different modes, listed in both formats as well.
On 16f917 and 12f683 both work perfectly, but stops dead on the 16f77. Tried every port/pin I could, as well as modes.
The b port on these units don't have anything connected, I'm stumped.

Thanks for the reply though. :)

[nomad]

this is driving me nuts lol... still cant figure out why it hangs on the owout command, no matter how it's done, what port, config settings, etc.. Have no problems at all with it on other pics.

(ugly but working temp recorder/readout to monitor our flaky fridge)


@ device pic12F683, intrc_osc_noclkout
@ device pic12F683, wdt_on
@ device pic12F683, mclr_off
@ device pic12F683, protect_off

DEFINE OSC 8

OSCCON.0=1 'system clock select bit 1=internal 0=config word
OSCCON.4=1 'set int osc to 8MHZ
OSCCON.5=1
OSCCON.6=1
ANSEL.3=0 'set all digital
ANSEL.2=0
ANSEL.1=0
ANSEL.0=0
CMCON0=7 'turn comparators off!
ADCON0=0 'turn ADC off
GPIO.7 = 0 'enable weak pullups 'NOTE: this didn't work for one wire or i2c coms.
WPU = %00111000 ' had to use external pullup anyways (did I set it wrong?)
'===========================================
DEFINE DEBUG_REGG GPIO 'set debug port to porta
DEFINE DEBUG_BIT 0 'use pin a0 of porta for debug
DEFINE DEBUG_BAUD 9600 'set baud rate to 2400
DEFINE DEBUG_MODE 0 'communicate in true mode
'12f683 is 14bit, no scl/sda defines

SCL var GPIO.4 ' Clock pin
SDA var GPIO.5 ' Data pin
readbutton var GPIO.3

maxsensor con 4

trisio.3 = 1 ' switch logging/readout stored temps (using mclr pin, mclr disabled)


Cold_Bit VAR Raw.Bit11 ' Sign-Bit for +/- Temp. 1 = Below 0 deg C
id var byte[8]
ADDR var WORD ' 24c32a uses 2 bytes for address (24lc256 as well)
raw var word
records var word
recordaddr var word
readloops var word
readaddr var word
tempc var word
tempf var word
Sign VAR byte ' +/- sign for temp display
fsign var byte
sensor var byte
hexbyte var byte
col var byte
busy var bit
rsign var bit

CLEAR

recordaddr = 31998 'store records at end (been writing to address 0 too much)
ADDR = 2 ' normal start address
'addr = 31960 'temporary testing eeprom full

goto start

subC_TO_F:
'DISABLE ' Necessary if On Interrupt used
'tempF = tempC * 9
'tempf = DIV32 5
'ENABLE ' Necessary if On Interrupt used
tempf = (tempc */ 461)

IF rsign = 1 THEN 'if the sign bit is "1" is minus C
IF tempF > 3200 THEN
fsign="-"
tempF = tempF - 3200
'SEROUT2 sSEROUT_PIN,cBAUD,[" -",DEC C/100,".",DEC2 C," C = -",DEC F/100,".",DEC2 F," F",13]
ELSE
fsign="+"
tempF = 3200 - tempF
'SEROUT2 sSEROUT_PIN,cBAUD,[" -",DEC C/100,".",DEC2 C," C = ",DEC F/100,".",DEC2 F," F",13]
ENDIF
ELSE
tempF = tempF + 3200
fsign = "+"
'SEROUT2 sSEROUT_PIN,cBAUD,[" ",DEC C/100,".",DEC2 C," C = ",DEC F/100,".",DEC2 F," F",13]
ENDIF
RETURN

GetID:
Select Case sensor
Case 1 :LOOKUP hexbyte,[$28,$00,$3E,$D8,$05,$00,$00,$10], col
Case 2 :LOOKUP hexbyte,[$28,$E1,$E2,$D6,$05,$00,$00,$64], col
Case 3 :LOOKUP hexbyte,[$28,$3C,$75,$D6,$05,$00,$00,$0C], col
Case 4 :LOOKUP hexbyte,[$28,$4F,$62,$D8,$05,$00,$00,$F5], col
'Case 5 :LOOKUP hexbyte,[], col
'Case 6 :LOOKUP hexbyte,[], col
'Case 7: LOOKUP hexbyte,[], col
'Case 8 :LOOKUP hexbyte,[], col
'Case 9 :LOOKUP hexbyte,[], col
end select
return

IDLOOP:
for hexbyte=0 to 7 'each sensor address is 8 bytes
gosub getid 'go look up each sensors address
id[hexbyte]=col 'load the ID array with the retrieved address byte
next hexbyte
return

DisplayTemp: ' +32.0 to +257 F
IF raw.bit15 = 1 THEN ' If Cold_Bit = 1, it's below "0" deg C
rsign = 1
Sign = "-"
else
sign = "+"
endif
raw = abs(raw)
tempc = raw */ 1600
'tempf = (tempc */ 461) + 3200
debug $0D,$0A,"reading : ",dec records
if readbutton = 1 then debug " - Sensor: ",dec1 sensor
debug " ",sign, DEC (tempc / 100), ".", DEC2 tempc, " C "
gosub subc_to_f

debug " / ",fsign, DEC (tempf / 100), ".", DEC2 tempf, " F "
return


START:

pause 800

IF readbutton = 0 then readstart
ReadSensor:
OWOUT GPIO.2, 1, [$cc,$44] 'skip romcheck (only one sensor), initiate[$44] temperature conversion
Ckbsy:
OWIN GPIO.2, 4, [busy] ' Check for still busy converting
IF busy = 0 THEN ckbsy ' Still busy?, then loop
sensor = sensor + 1
if sensor = maxsensor+1 then sensor = 1
gosub idloop
'=============================================
'owout GPIO.2,1,[$cc,$BE] 'skiprom (one sensor only) send back scratchpad[$BE]
owout GPIO.2,1,[$55,str id\8,$BE] 'instructs sensors to match[$55] this[ID] and start sending back scratchpad[$BE]
'=============================================
OWIN GPIO.2, 2, [Raw.LOWBYTE,Raw.HIGHBYTE]
if addr > 31997 then
debug "eeprom full, not stored"
else
I2CWRITE SDA,SCL,$A0,ADDR,[raw.lowbyte,raw.highbyte]
pause 100
records = addr / 2
i2cwrite sda,scl,$A0,recordaddr,[records]
addr = addr + 2
endif
gosub displaytemp
goto start

readstart:
readaddr = 0
i2cread sda,scl,$A0,recordaddr,[records]
readloops = records*2
rloop:
while readaddr < readloops
pause 50
I2CREAD SDA,SCL,$A0,readaddr,[raw.lowbyte,raw.highbyte]
readaddr = readaddr + 2
records = readaddr / 2
gosub displaytemp
IF readbutton = 1 then start
wend
goto start

end


really frustrating as I really wanted to use one of these 16f77 boxes I have.

[Dave]

Nomad, I'm going out on a limb here but, looking at your code are you sure it's hanging on the OWOUT statement and not the OWIN? I see where you are queing the sensor for a busy signal but what happens if you do not receive any?

[nomad]

that code is on the 12f683 and works fine.

for the 16f77 ive stripped it all down to


@ __CONFIG _BODEN_ON & _CP_OFF & _PWRTE_ON & _WDT_ON & _HS_OSC

DEFINE OSC 16

ADCON1 = 7


start:

pause 500
debug "owout (start conversio)"
OWOUT portb.2, 1, [$CC,$44]
debug "success!"
pause 500

goto start



I see the start message, but nothing more.
what really has me is even if there wasn't a device connected, it shouldn't hang on owout, and I can't even think of a condition it could hang at owout. I've found nothing on this being an issue, so I'm just going to have to use a different device.

[pedja089]

Your code compiled with PBP3:
7342
Just change extension to .hex instead of .txt.

[nomad]

well, it appears I need to upgrade to pbp3. :/
that bites lol.

using the 3 demo it didn't hang at the owout.

[pedja089]

Look in .mac file which macro is called when compile for 12F, and which for 16F.
I think that should be same. If it is same, then problem must be in MPASM. So try another version of MPASM...

[nomad]

the 12f683 and 16f77 are both 14bit. ( It works on 16f917, and tried both pm and mpasm prior to posting)
As I mentioned getting pbp3, my wife gave me that *oh heck no* look, (I just bought some electronic toys).
So that will have to wait a while.
I copied the pbp3 pbppic14.lib,.mac,and .ram files to my pbp, and presto, it didn't hang!
actually had temp readings on the lcd!
going to compare the ow macros and see what is different from 2.5 to 3 that the 16f77 was choking on when I get time.

***Thank You*** for taking the time to compile it, I don't know that I would have went to pbp3 to test on my own.
problem solved (well, it's working anyways), now to watch other devices wig from the wrong macro file lol :)

[Dave]

Nomad, Glad to see you got it to work by changing the .lib file.