norm
Joined: 19 Aug 2010
Posts: 4
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| PWM,CCP5,Timer4,PIC18F45K22 |
 Posted: Fri Sep 10, 2010 1:07 pm |
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I can't get a PWM signal to come out of the RE2 pin 27.
Has anyone else been successful implementing this?
Watching in the MPLAB, CCPR5H never gets loaded from the CCPR5L.
| Code: |
#include <18F45K22.H>
#fuses INTRC_IO, NOLVP, NOPROTECT, NOWDT, NOPUT, BROWNOUT, NOPBADEN, CCP2C1
#use delay(clock=16000000)
#byte ADCON1 = 0xFC1
#bit TRIGSEL = ADCON1.7
#byte CCP5CON = 0xF54
#bit DC5B1 = CCP5CON.5
#bit DC5B0 = CCP5CON.4
#byte CCPTMRS1 = 0xF48
#bit C5TSEL1 = CCPTMRS1.3
#bit C5TSEL0 = CCPTMRS1.2
#byte PR4 = 0xF52
#byte TMR4 = 0xF53
#byte CCPR5L = 0xF55
#byte CCPR5H = 0xF56
#byte T4CON = 0xF51
#bit TMR4ON = T4CON.2
#byte PIR5 = 0xF7E
#bit TMR4IF = PIR5.0
void main()
{
char dummy=0;
setup_oscillator(OSC_16MHZ,0);
disable_interrupts(GLOBAL);
enable_interrupts(GLOBAL);
C5TSEL1 = 0; // Select Timer 4
C5TSEL0 = 1; // Select Timer 4
setup_timer_4(T4_DIV_BY_1,160,1);
setup_ccp5(CCP_PWM);
set_pwm5_duty(100L);
while (1)
{
dummy++;
}
} /*********************** end of main *************/
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Section of List file
| Code: |
.................... C5TSEL1 = 0;
003E: MOVLB F
0040: BCF x48.3
.................... C5TSEL0 = 1;
0042: BSF x48.2
.................... setup_timer_4(T4_DIV_BY_1,160,1);
0044: MOVLW 00
0046: IORLW 04
0048: MOVWF x51
004A: MOVLW A0
004C: MOVWF x52
.................... setup_ccp5(CCP_PWM);
004E: BCF F96.2
0050: BCF F8D.2
0052: MOVLW 0C
0054: MOVWF x54
.................... set_pwm5_duty(100L);
0056: MOVLW 19
0058: MOVWF x55
005A: MOVF x54,W
005C: ANDLW CF
005E: MOVWF x54
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I'm surprised to see this in the list, some statements make use of it, and others don't.
003E: MOVLB F
Thanks Norm |
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