GCBASIC / Discussion / Open Discussion: SOSC On 18F26K80 won't run

mmotte - 2023-12-18

I am using the 18F26K80 because it has a 12bit A/D and i have a tube full of them.
I have been using the internal clock to run the RTC for data logging but it runs a little off.

My hardware runs with a 16F886 plugged in on the external osc on T1 just fine.
But when I try to use the 18F26K80 it bawks! Same program except for chip statement and read AD12 instead of readAD10.

12:9:37, 16:11:43, 1023,1023 12:9:39, 16:11:45, 1023,1023 12:9:42, 16:11:48, 1023,1023 '16F886 12:9:44, 16:11:50, 1023,1023 12:9:46, 16:11:52, 1023,1023 12:9:48, 16:11:54, 1023,1023 12:9:50, 16:11:56, 1023,1023 þadcon1= 4812:2:0, 16:4:5, 31,27 12:2:0, 16:4:5, 128,112 '18F26K80 12:2:0, 16:4:5, 258,226 12:2:0, 16:4:5, 412,360 12:2:0, 16:4:5, 581,509 12:2:0, 16:4:5, 731,641 12:2:0, 16:4:5, 824,722 12:2:0, 16:4:5, 887,780

I have searched the Forum and my program is just like the programs in the forum.

I don't know what I am missing?

I have read the data sheet.
I have tried configuring directly.

Please any ideas?

Mike w9ys

DataLogger_v12_17_AD8302_16F886_siderealRTC.gcb

DataLogger_v12_17_AD8302_18F26K80_siderealRTC.gcb
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mmotte - 2023-12-18

I know you usually ask for the .asm file.

here it is

DataLogger_v12_17_AD8302_18F26K80_siderealRTC.asm

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Anobium - 2023-12-19

Interesting.

What is the value of T1CON after InitTimer1 sosc, 0 ?

And, I have just learnt this!

Dim enter as string enter = 13, 10

So, clever!!
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Hi Anobium,

Been trying to understand the 18F26K80 pdf and it talked about waiting for the sosc to start.

 'Interrupt Handlers
  InitTimer1 sosc, 0
  HSerprint "after init T1CON = 0x"
  HSerprint hex(T1CON)
  HSerprintCRLF

  HSerprint "OSCCON2 = 0x"
  HSerprint hex(OSCCON2)
  HSerprintCRLF
  StopTimer 1
  settimer 1,0x8000       ' 16bit load bit is set to allow
  'SOSCSEL1 =1
  'SOSCSEL0 =1
  wait 50 us
  On Interrupt Timer1Overflow Call RTC

  'T1CON = 0x8B     'Enable SOSCEN external 32k osc
  StartTimer 1

But the wait did not help.

12:2:0, 16:4:5, 660,557
12:2:0, 16:4:5, 880,743
12:2:0, 16:4:5, 1098,928
after init T1CON = 0x88
OSCCON2 = 0x12
after init T1CON = 0x88
OSCCON2 = 0x12
after init T1CON = 0x88
OSCCON2 = 0x12
after init T1CON = 0x88
OSCCON2 = 0x12
after starttimer1 T1CON = 0x89
OSCCON2 = 0x12
12:2:0, 16:4:5, 110,92
12:2:0, 16:4:5, 329,277

Looks right

Mike

Anobium - 2023-12-19

T1CON should be 0x81. Set T1CON = 0x81after the StartTimer 1

This should work.

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Didn't work.

12:2:0, 16:4:5, 1105,926
12:2:0, 16:4:5, 1104,927
after init T1CON = 0x88
OSCCON2 = 0x12
after init T1CON = 0x88
OSCCON2 = 0x12
after starttimer1 T1CON = 0x81
OSCCON2 = 0x12
12:2:0, 16:4:5, 166,144
12:2:0, 16:4:5, 348,300

Actually starttimer1 give 0x89 which is correct because bit 3 of T1CON is SOSCEN should be 1

I took the HSerPrint statements out because they might be interfering with startup and gave it a 500 us wait before "starttimer1"

12:2:0, 16:4:5, 1085,919
after starttimer1 T1CON = 0x89
OSCCON2 = 0x12
12:2:0, 16:4:5, 219,183

 'Interrupt Handlers
  InitTimer1 sosc, 0
  'HSerprint "after init T1CON = 0x"
  'HSerprint hex(T1CON)
  'HSerprintCRLF

  'HSerprint "OSCCON2 = 0x"
  'HSerprint hex(OSCCON2)
  'HSerprintCRLF
  'StopTimer 1
  settimer 1,0x8000       ' 16bit load bit is set to allow
  'SOSCSEL1 =1
  'SOSCSEL0 =1
  wait 500 us
  On Interrupt Timer1Overflow Call RTC

  'T1CON = 0x8B     'Enable SOSCEN external 32k osc
  StartTimer 1
  'Set T1CON = 0x81

Not working!

I am almost to the point of ordering a different chip or putting a external A/D on the I2C of the old 16F886 which works.

73
Mike

Anobium - 2023-12-19

It would only be 0x89 if the config was set to SOSC, which it is not.

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mmotte - 2023-12-19

actually config / init gives it 0x88

and then the starttimer1 adds the '1' giving 0x89

where is "high power"? I need to check that.

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Anobium - 2023-12-19

Open PICINFO, select SOSCSEL. Take the config, post into source.

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mmotte - 2023-12-19

DataLogger_v12_17_AD8302_18F26K80_siderealRTC.gcb (110): Error: Variable SOSCSEL was not explicitly declared

It is in the chip file but I can not set it to "HIGH".

I also tried to read "CONFIG1L" which doesn't exist
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mmotte - 2023-12-19

Where is PICINFO?

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- Anobium - 2023-12-19
  
  From GCODE IDE, press function key <f4>, then type PICINFO, select/press enter.</f4>
  
  In PICINFO enter your select PIC in the dialog near the bottom/left . Your PIC will be shown.
  
  Screenshot 2023-12-19 160227.png
  
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mmotte - 2023-12-19

SERPRINTVAL_H EQU 58 ; 0x3A SHOURS EQU 61 ; 0x3D SMINS EQU 62 ; 0x3E SOSCSEL EQU 63 ; 0x3F SSECS EQU 64 ; 0x40 STR EQU 3400 ; 0xD48 STRINGPOINTER EQU 65 ; 0x41 SYSARRAYTEMP1 EQU 66 ; 0x42

SOSCSEL is in the .asm file but no value
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- Anobium - 2023-12-19
  
  If have #option explicit and you have set SOSCEL = 'a value' and it does not have an associated dim the compiler would complain.
  
  So, it depends what is in your program. I would need the program to figure out.
  
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mmotte - 2023-12-19

Yayhhh! That did it. I would never have found that. SOSCCON was bucking me off. I was there before but couldn't make it work.

It works!

12:2:0, 16:4:5, 1084,927 after starttimer1 T1CON = 0x89 12:2:2, 16:4:7, 217,185 12:2:8, 16:4:13, 866,742 12:2:10, 16:4:15, 1083,927 12:2:12, 16:4:17, 1081,927 12:2:14, 16:4:19, 1080,926 12:2:16, 16:4:21, 1081,926 12:2:18, 16:4:23, 1083,926 12:2:20, 16:4:25, 1086,925 12:2:22, 16:4:27, 1089,925 12:2:24, 16:4:29, 1092,924 12:2:26, 16:4:31, 1095,924 12:2:28, 16:4:33, 1097,923

Selecting SOSCCON HIGH and then copying the config into the top of the code did it.

Now to actually work on my project.
Thank you!!!
Mike
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mmotte - 2023-12-19

Yayhhh! That did it. I would never have found that. SOSCCON was bucking me off. I was there before but couldn't make it work.

It works!

12:2:0, 16:4:5, 1084,927 after starttimer1 T1CON = 0x89 12:2:2, 16:4:7, 217,185 12:2:8, 16:4:13, 866,742 12:2:10, 16:4:15, 1083,927 12:2:12, 16:4:17, 1081,927 12:2:14, 16:4:19, 1080,926 12:2:16, 16:4:21, 1081,926 12:2:18, 16:4:23, 1083,926 12:2:20, 16:4:25, 1086,925 12:2:22, 16:4:27, 1089,925 12:2:24, 16:4:29, 1092,924 12:2:26, 16:4:31, 1095,924 12:2:28, 16:4:33, 1097,923

Selecting SOSCCON HIGH and then copying the config into the top of the code did it.

Now to actually work on my project.
Thank you!!!
Mike
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Anobium - 2023-12-19

Excellent!

There is a huge amount of infomation in PICINFO.....

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SOSC On 18F26K80 won't run

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SOSC On 18F26K80 won't run

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SOSC On 18F26K80 won't run