Using PWM.

[Donald]

<font face="Courier New" size=-1>Ihave the following error when trying to compile a program that is using PWM. It is compiler version IDE 3.6 PCM 3.05.

APPLICATION ERROR
Execption Ecerror in module PCM.DLL at 00075734.

Any help would be great. Here is a copy of the program.

// pulse.c
// This is a test to see how the pulse width modulation generator works.

#include <16F877.h>
#fuses xt,nowdt
#use delay(clock=4000000)

void lcd_send_command(int n);
void lcd_send_data(char n);
void pulse_width(int period, int duty);

void main (void)
{
int period, duty;

do{
period = 100;
duty = 50;

// Initialize the LCD
lcd_send_command(0x38); // 2 lines, 5x7 matrix.
lcd_send_command(0x01); // Clear LCD.
lcd_send_command(0x02); // Set cursor to home position.
lcd_send_command(0x0F); // Set cursor blinking.

// PWM
pulse_width(period, duty);

// Display the Period.
lcd_send_data("Period = ");
lcd_send_data(period + 48);

// Display the Duty Cycle.
lcd_send_command(0xC0);
lcd_send_data("Duty = ");
lcd_send_data(duty + 48);
}while(true);


}

void lcd_send_command(int n)
{
output_d(n); // Send a command.
output_low(PIN_B6); // Set Rs=0;
output_high(PIN_B7); // Set E=1;
delay_ms(5); // Delay 5ms
output_low(PIN_B7); // Clear E=0;
delay_ms(10); // Delay 10ms.
}

void lcd_send_data(char n)
{
output_d(n); // Send data to LCD.
output_high(PIN_B6); // Set Rs=1.
output_high(PIN_B7); // Set E=1.
delay_ms(5); // Delay 5ms.
output_low(PIN_B7); // Clear E=0.
delay_ms(10); // Delay 10ms.
}

void pulse_width(int period, int duty)
{
setup_ccp1(CCP_PWM); // Setup for PWM.
setup_timer_2(T2_DIV_BY_1, period, 0);
setup_pwm1_duty(duty);
}</font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 11792

[PCM programmer]

:=Ihave the following error when trying to compile a program that is using PWM.
:=
:=APPLICATION ERROR
:=Exception Error in module PCM.DLL at 00075734.
----------------------------------------------------

What version of the compiler ? They're all different.
___________________________
This message was ported from CCS's old forum
Original Post ID: 11802

[Donald]

:=:=Ihave the following error when trying to compile a program that is using PWM.
:=:=
:=:=APPLICATION ERROR
:=:=Exception Error in module PCM.DLL at 00075734.
:=----------------------------------------------------
:=
:=What version of the compiler ? They're all different.

--------------------------------------------------------
It is IDE version 3.6 PCM 3.05
___________________________
This message was ported from CCS's old forum
Original Post ID: 11808

[PCM programmer]

<font face="Courier New" size=-1>:=:=:=Ihave the following error when trying to compile a program that is using PWM.
:=:=:=
:=:=:=APPLICATION ERROR
:=:=:=Exception Error in module PCM.DLL at 00075734.
:=:=----------------------------------------------------
:=:=
:=:=What version of the compiler ? They're all different.
:=
:=--------------------------------------------------------
:=It is IDE version 3.6 PCM 3.05

=========================================================
You mean vs. 3.050. Well, it's most likely a problem
with the compiler. You got one of CCS's "interim" versions
in which they introduced a temporary bug. See the following
partial list, taken from their old versions page.

3.052 SET_TRIS_D and E were broke in 3.050,3.051 now restored
3.052 In some cases an exception appeared instead of a syntax error - Now fixed

I don't know how you can fix this without upgrading.
As a work-around, any time you get an exception, assume
that it's caused by syntax error. Use /* */ comments
to comment out blocks of code until the exception goes
away. Then find the exact line by using // comments.

With regard to the program you posted, here are two lines
that caused a syntax error when I compiled it.

The problems were:

1. The postscale parameter can be 1-16, not 0-15.
This is documented in the manual.

2. The function is called set_pwm1_duty(), not "setup...".


void pulse_width(int period, int duty)
{
setup_ccp1(CCP_PWM); // Setup for PWM.
setup_timer_2(T2_DIV_BY_1, period, 1); // Was 0
set_pwm1_duty(duty); // Was setup_pwm1_duty(duty)
}

------
One more thing -- I noticed that you don't have NOLVP in
your fuses statement. If you're using a LVP programmer,
that's OK. But if you're using a normal programmer,
such as PicStart-Plus, Warp-13a, etc., then you should
add NOLVP to your #fuses statement.

</font>
___________________________
This message was ported from CCS's old forum
Original Post ID: 11812