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aviarunash
Joined: 15 Nov 2018
Posts: 5
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| Unexpected Restart of 18F45K22 |
 Posted: Thu Nov 15, 2018 9:39 pm |
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Hi All,
I am using 18F45K22, with two uart enabled (compiler 5.008). Have an external 20Mhz Crystal. The below are the fuse settings. The problem is that, when I use more delays or add an additional code somewhere in the program the controller restarts which does not make any sense.
For eg, when I assign a value to a variable in between somewhere, it restarts.
I am not sure why this is happening, please give me some suggestions on what might be causing the trouble.
| Code: |
#include <18F45K22.h>
#include <stdlib.h>
#fuses HSH,NOPLLEN,NOWDT,PUT,NOBROWNOUT,NOLVP,MCLR,NOIESO,NOPBADEN,NOFCMEN,NOSTVREN,NOXINST,NODEBUG #use delay(clock=20000000,CRYSTAL=20M)
#use rs232(baud=9600,parity=N,xmit=PIN_C6, rcv=PIN_C7,bits=8,stream=STU,errors)
#use rs232(baud=9600,parity=N,xmit=PIN_D6, rcv=PIN_D7,bits=8,stream=DEIC,errors)
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Ttelmah
Joined: 11 Mar 2010
Posts: 19513
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| Posted: Fri Nov 16, 2018 2:27 am |
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First, you should have STVREN enabled. Do this, and add a test at the start of your code for 'RESTART_CAUSE'. This will help tell you why the chip is resetting.
Look at your listing file. How big is the stack?. Has all the sounds possibly that you are using too many stack levels.
Then 5.008, was a 'beta' compiler version at best. It had issues, particularly with disabling global interrupts when it shouldn't.
Other things that can cause resets are things like having interrupts enabled without a handler present, and (obviously) hardware issues. |
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aviarunash
Joined: 15 Nov 2018
Posts: 5
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| Posted: Sat Nov 17, 2018 3:53 am |
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Thank you for your reply.
I have enabled the fuse STVREN as you said. But still the problem exists. Haven't left any interrupts without handler. Just have the two UART interrupts. This is my main routine.
| Code: |
set_tris_a(0x01);
set_tris_d(0xF0);
set_tris_b(0x06);
set_tris_c(0xC0);
setup_comparator(NC_NC_NC_NC);
setup_dac(DAC_OFF);
setup_adc(ADC_OFF);
setup_adc_ports(NO_ANALOGS);
setup_wdt(WDT_OFF);
enable_interrupts(INT_RDA);
enable_interrupts(INT_RDA2);
enable_interrupts(GLOBAL);
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aviarunash
Joined: 15 Nov 2018
Posts: 5
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| Posted: Sat Nov 17, 2018 3:55 am |
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Regarding Stack Size:
ROM used: 2496 bytes (8%)
Largest free fragment is 30268
RAM used: 110 (7%) at main() level
130 (8%) worst case
Stack used: 4 locations (3 in main + 1 for interrupts)
Stack size: 30 |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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Ttelmah
Joined: 11 Mar 2010
Posts: 19513
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| Posted: Sat Nov 17, 2018 12:42 pm |
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| Well remembered/found PCM_programmer. I remember 5.008, was still a 'beta' for me, since it had problems. Around 5.018, was the first I considered to be reasonably usable. |
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