CCS C Software and Maintenance Offers
FAQFAQ   FAQForum Help   FAQOfficial CCS Support   SearchSearch  RegisterRegister 

ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

CCS does not monitor this forum on a regular basis.

Please do not post bug reports on this forum. Send them to support@ccsinfo.com

How to set ECCP(full-bridge) in 18f65j10?

 
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion
View previous topic :: View next topic  
Author Message
norman_tan



Joined: 30 Jan 2008
Posts: 27

View user's profile Send private message

How to set ECCP(full-bridge) in 18f65j10?
PostPosted: Fri Mar 21, 2008 8:08 pm     Reply with quote

Dear all,
I am using the chip 18f65j10 and going to use ECCP(Full-bridge) for Inverter. so I copied codes below from forum. only changed
#include <18F65j10.h>
#fuses HS,NOWDT
#use delay (clock=20000000)
and ECCP1DEL = 0xF79(for 18f65j10 it is so).
I measured with oscilloscope. but there are no any signal on P1A, P1B, P1C, P1D. there are all 0 level forever.
Does Any one meet this problem?
Would you please give me some advice for it?
thanks!

codes:

#include <18F4550.h>
#fuses XT,NOWDT,BROWNOUT,PUT,NOLVP
#use delay (clock=4000000)

//-----------------------------------------
// Setup the PWM shutdown mode so it sets the PWM outputs
// low, if the FLT0 pin is held at a low level. Set it to
// turn the PWM back on again if the FLTO pin is set high.
#define CCP_SHUTDOWN_MODE (CCP_SHUTDOWN_ON_INT0 | \
CCP_SHUTDOWN_AC_L | \
CCP_SHUTDOWN_BD_L | \
CCP_SHUTDOWN_RESTART)


void setup_enhanced_pwm(int8 pwm_mode, int32 eccp_mode)
{
#byte ECCP1AS = 0xFB6
#byte ECCP1DEL = 0xFB7

setup_ccp1(pwm_mode);

ECCP1AS = eccp_mode >> 16;
ECCP1DEL = eccp_mode >> 24;
}

//=================================
void main()
{
// Setup the ECCP for PWM in full bridge mode. Also
// enable the shutdown mode so it's controlled by the
// logic level on the FLT0 pin. (0 = PWM off, 1 = on).
setup_enhanced_pwm(CCP_PWM_FULL_BRIDGE | CCP_PWM_H_H, CCP_SHUTDOWN_MODE);

setup_timer_2(T2_DIV_BY_1, 255, 1);
set_pwm1_duty(100);

// Switch the H-Bridge outputs between forward
// and reverse every 5 seconds.
while(1)
{
// Run forward for 5 seconds.
setup_enhanced_pwm(CCP_PWM_FULL_BRIDGE | CCP_PWM_H_H, CCP_SHUTDOWN_MODE);
delay_ms(5000);

// Run in reverse for 5 seconds.
setup_enhanced_pwm(CCP_PWM_FULL_BRIDGE_REV | CCP_PWM_H_H, CCP_SHUTDOWN_MODE);
delay_ms(5000);
}

}
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

View user's profile Send private message

PostPosted: Sat Mar 22, 2008 1:20 am     Reply with quote

That code is from this post:
http://www.ccsinfo.com/forum/viewtopic.php?t=32085
It's intended to test Shutdown mode. It requires a pull-up resistor
to be connected to the FLT0 pin, or won't run.

Also, that program has work-around code in it, because the person it
was written for was using a very early version, vs. 4.013, which didn't
work correctly in ECCP PWM mode.
Display posts from previous:   
Post new topic   Reply to topic    CCS Forum Index -> General CCS C Discussion All times are GMT - 6 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group