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mdemuth
Joined: 16 Apr 2007
Posts: 71
Location: Stuttgart, Germany
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| Simple PWM on CCP1 with 18f45k22 (solved) |
 Posted: Wed Dec 01, 2010 11:58 am |
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Hi,
I am trying to have a simple PWM on CCP1 (PIN_C2) using compiler version 4.114
| Code: |
setup_oscillator (OSC_64MHZ);
SETUP_ADC_PORTS(sAN0 | sAN1);
SETUP_ADC(ADC_CLOCK_INTERNAL);
SETUP_DAC(DAC_OFF);
setup_comparator(nc_nc_nc_nc);
setup_timer_2(T2_DIV_BY_16, 1023, 16);
setup_ccp1(CCP_PWM); // Configure CCP1 as a PWM
set_pwm1_duty (120);
SETUP_WDT(WDT_OFF); //WDT
setup_uart(19200,COM1);
setup_uart(9600,COM2);
set_tris_a(0b00000011); //
set_tris_b(0b11000000); //
set_tris_c(0b10011000); //
set_tris_d(0b00000000); //
set_tris_e(0b00001000); //
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All I see is 2.5V at pin_C2.
Thanks in advance!
Michael
Last edited by mdemuth on Thu Dec 02, 2010 6:54 am; edited 1 time in total |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Wed Dec 01, 2010 1:04 pm |
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I stripped your program down to the minimum necessary code to show
the problem. There is a problem with the setup_timer_2() function in
vs. 4.114 for the 18F45K22. It writes to incorrect registers. This can
be fixed with the work-around macro shown below. The compiler will
substitute the macro code for it's own built-in function. Then it works.
This bug should be emailed to CCS support. Do you want to do it, or
do you want me to do it ?
| Code: |
#include <18F45K22.h>
#fuses INTRC_IO,NOWDT,PUT,BROWNOUT,NOLVP
#use delay(clock=4000000)
#byte T2CON = 0xFBA
#byte PR2 = 0xFBB
#define setup_timer_2(prescaler, PR2val, postscaler) \
if(prescaler) \
{ \
PR2 = PR2val; \
T2CON = prescaler | ((postscaler -1) << 3); \
} \
else \
T2CON = 0;
//======================================
void main(void)
{
setup_timer_2(T2_DIV_BY_1, 255, 1);
setup_ccp1(CCP_PWM);
set_pwm1_duty(120);
while(1);
} |
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mdemuth
Joined: 16 Apr 2007
Posts: 71
Location: Stuttgart, Germany
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| Posted: Thu Dec 02, 2010 2:51 am |
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Good work! 
Thanks for your effort!
If you don't mind I will forward the complete topic to the official support.
Best regards,
Michael |
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