Cấu hình EPWM của Pic18F458 bằng CCS

[TANDEM]

16.5.8 SETUP FOR PWM OPERATION
The following steps should be taken when configuring
the ECCP1 module for PWM operation:
1. Configure the PWM module:
a) Disable the ECCP1/P1A, P1B, P1C and/or
P1D outputs by setting the respective TRISD
bits.
b) Set the PWM period by loading the PR2
register.
c) Set the PWM duty cycle by loading the
ECCPR1L register and ECCP1CON<5:4>
bits.
d) Configure the ECCP1 module for the
desired PWM operation by loading the
ECCP1CON register with the appropriate
value. With the ECCP1M<3:0> bits, select
the active-high/low levels for each PWM
output. With the EPWM1M<1:0> bits, select
one of the available output modes.
e) For Half-Bridge Output mode, set the dead-
band delay by loading the ECCP1DEL
register with the appropriate value.
2. Configure and start TMR2:
a) Clear the TMR2 interrupt flag bit by clearing
the TMR2IF bit in the PIR1 register.
b) Set the TMR2 prescale value by loading the
T2CKPS bits (T2CON<1:0>).
c) Enable Timer2 by setting the TMR2ON bit
(T2CON<2>) register.
3. Enable PWM outputs after a new cycle has
started:
a) Wait until TMR2 overflows (TMR2IF bit
becomes a ‘1’). The new PWM cycle begins
here.
b) Enable the ECCP1/P1A, P1B, P1C and/or
P1D pin outputs by clearing the respective
TRISD bits.

Tôi đã cố gắng đọc nhưng quả thật không thể hiểu để vận dụng chuyển thành CCS. Vậy nhờ các tiền bối giúp tôi cấu hình cho EPWM của Pic18F458 bằng CCS để sử dụng 5 kênh điều xung (C2, D4, D5, D6, D7). Xin chân thành cám ơn!

[TANDEM]

 //********************************************************************************************
//Header:		
//File Name:	
//Hard:			PIC18F458 
//Author:		
//Date:			... April 2011
//********************************************************************************************
#include <18F458.H>
#FUSES NOWDT                 								//No Watch Dog Timer
#FUSES NOPROTECT             								//Code not protected from reading
#FUSES NOBROWNOUT            								//No brownout reset
#FUSES NOPUT                 								//No power Up Timer
#FUSES NODEBUG               								//No Debug mode for ICD
#FUSES NOLVP                 								//No low voltage prgming, B3(PIC16) or B5(PIC18) used for I/O
#FUSES NOWRT                 								//Program memory not write protected
#fuses HS														//
#use delay(clock=40000000)									//Thach anh gan tren board la 40MHz

#byte porta = 0xF80
#byte portb = 0xF81
#byte portc = 0xF82
#byte portd = 0xF83
#byte porte = 0xF84

#byte PR2       = 0xFCB
#byte ECCP1CON  = 0xFBA
#byte ECCPR1L   = 0xFBB
#byte ECCPR1H   = 0xFBC
#byte PIR1      = 0xF9E
#byte T2CON     = 0xFCA 


void khoitao(void);
void setup_ECCP(void);

void main(void)
{
	khoitao();
}

//Ham khoi tao**************************************************************************
void khoitao(void)
{
	setup_adc_ports(NO_ANALOGS);							//tat ca porta la digital                        
	setup_ECCP();
	set_pwm1_duty(50);
	set_pwm2_duty(50);
	//set_pwm3_duty(50);
	//set_pwm4_duty(50);
}	

//Ham phuong an*************************************************************************
void setup_ECCP(void)					//cau hinh ECCP de su dung 4 kenh(d4-d7)PWM o che do "single output"
{
	//1. Configure the PWM module: 
	//a) Disable the ECCP1/P1A, P1B, P1C and/or P1D outputs by setting the respective TRISD bits.
   set_tris_d(0xFF);
   
  	//b) Set the PWM period by loading the PR2 register
   PR2 = 50;
   
   //c) Set the PWM duty cycle by loading the ECCPR1L register and ECCP1CON<5:4> bits.
   //d) Configure the ECCP1 module for the desired PWM operation by loading the ECCP1CON 
   //register with the appropriate value. With the ECCP1M<3:0> bits, select 
   //the active-high/low levels for each PWM output. With the EPWM1M<1:0> bits, select
	//one of the available output modes.    
   ECCPR1L = 0x00;       
   ECCP1CON = 0b00001100;  			//Chon che do "single output" va cac "pins out" deu o muc "high" 
      
   
   //2. Configure and start TMR2: 
   //a) Clear the TMR2 interrupt flag bit by clearing the TMR2IF bit in the PIR1 register.
   
   PIR1 = 0x00;										
   
   //b) Set the TMR2 prescale value by loading the T2CKPS bits (T2CON<1:0>).
	//c) Enable Timer2 by setting the TMR2ON bit (T2CON<2>) register.
   T2CON = 0x00;  
   T2CON |= 0x04;
   
   //3. Enable PWM outputs after a new cycle has started:
	//a) Wait until TMR2 overflows (TMR2IF bit becomes a ‘1’). The new PWM cycle begins here.
   while (PIR1)
   {
   }
   
   //b) Enable the ECCP1/P1A, P1B, P1C and/or P1D pin outputs by clearing the respective TRISD bits. 
   set_tris_d(0x0F);    
}

Sau một thời gian nghiên cứu, tôi đã thực hiện như chỉ dẫn của datasheet. Tuy nhiên, kết qua thi không như mong muốn, trong đoạn code trên nếu set_pwm1_duty(50); set_pwm2_duty(50); thì 2 pin D4(P1A) và D7(P1D) có tín hiệu, nếu set_pwm1_duty(50); set_pwm2_duty(50); set_pwm3_duty(50); set_pwm4_duty(50); thì chương trình sẽ báo lỗi.
Vậy nhờ các tiền bối phát hiện giúp lỗi ở đâu. Xin cảm ơn!

[shakespeare_a18]

Thấy code của bạn có vẻ rắc rối quá.
Tôi xài 18F4550.
chế độ Full bridge: setup_ccp1(0xCC);
chế độ Full bridge rev (quay ngược): setup_ccp1(0x4C);
bên cạnh đó cần set tris d là output.