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INT01
Joined: 21 Feb 2011
Posts: 5
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| setup_timer_2 function |
 Posted: Thu Oct 06, 2011 4:19 am |
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When I use the setup_timer_2() function I get this:
| Code: |
491: setup_timer_2(T2_DIV_BY_16,255,5);
10D2 0E20 MOVLW 0x20
10D4 0906 IORLW 0x6
10D6 6ECA MOVWF SSP1MSK, ACCESS
10D8 0EF9 MOVLW 0xff
10DA 6ECB MOVWF SSP1CON3, ACCESS
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Why?
PIC18F46K22 with V4.114 |
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temtronic
Joined: 01 Jul 2010
Posts: 9246
Location: Greensville,Ontario
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| Posted: Thu Oct 06, 2011 9:44 am |
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I suggest reading the section on Special Function Registers as well as the SSP chapters for whatever PIC you're using.
Then 'play computer' and see what bits are being set/cleared on those registers.
Learn by doing....the more you read, the more you'll understand. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Thu Oct 06, 2011 2:36 pm |
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| Quote: |
When I use the setup_timer_2() function I get this:
setup_timer_2(T2_DIV_BY_16,255,5);
10D2 0E20 MOVLW 0x20
10D4 0906 IORLW 0x6
10D6 6ECA MOVWF SSP1MSK, ACCESS
10D8 0EF9 MOVLW 0xff
10DA 6ECB MOVWF SSP1CON3, ACCESS
Why?
PIC18F46K22 with V4.114
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That function writes to the wrong registers in your compiler version.
Here's a macro that will replace the defective function. Just put it
above main() as shown below. Then call setup_timer_2() and it will
put in the correct code. Example:
| Code: |
#include <18F46K22.h>
#fuses XT,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=4000000)
// This macro replaces the CCS built-in function setup_timer_2():
#byte T2CON = 0xFBA
#byte PR2 = 0xFBB
#define setup_timer_2(t2_mode, t2_period, t2_ps) \
T2CON = (t2_mode | ((t2_ps -1) << 3)); \
PR2 = (t2_period);
//======================================
void main(void)
{
setup_timer_2(T2_DIV_BY_16, 255, 5);
while(1);
}
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This problem doesn't occur in vs. 4.124. CCS must have fixed it sometime
after vs. 4.114. (Note: This is a problem with 18F46K22 for that version,
not all PICs). |
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