[讨论]ECT无法实现，PWM也出不来，又要请教了。 讨论, ECT, 请教, PWM

zangsir

#include <hidef.h>      /* common defines and macros */
#include <mc9s12c32.h>     /* derivative information */

#include "main_asm.h" /* interface to the assembly module */

#pragma LINK_INFO DERIVATIVE "mc9s12c32"

unsigned char a,b,c;
unsigned char pwm0,pwm1,pwm2,pwm3,pwm4,pwm5,pwm6,pwm7;

volatile void RTI_Init(void)
  {
    CRGINT_RTIE=1;
    CRGFLG_RTIF=0;
    RTICTL=0b01000000;
  }

volatile void ECT_Init(void)
  {
    TSCR2=0b10001011;
    TSCR1_TEN=1;
  }
 
volatile void PWM_Init(void);
 
void main(void)
{
  /* put your own code here */
  DDRA=0b00111111;
  DDRB=0b00111111;
  DDRT=0b00011111;
 
/*  RTI_Init();*/
  ECT_Init();
  ATD_Init();

  pwm0=0;
  pwm1=2;
  pwm2=4;
  pwm3=8;
  pwm4=10;
 
  PWM_Init();

  PORTA=0;
  PORTB=0;
 
  EnableInterrupts;
  for(;;)
  {
    if(b<127)
      {
        PORTA_BIT0=0;
        PORTB_BIT4=1;
      }else
      {
        PORTA_BIT0=1;
        PORTB_BIT4=0;
      }
  } /* wait forever */
}

/*volatile void interrupt 7 RTI_Int(void)
  {
    CRGFLG_RTIF=1;
    b++;
  }*/
 
volatile void interrupt 16 ECT_Int(void)
  {
    TFLG2_TOF=1;
    b++;
  }
 
volatile void PWM_Init(void)
  {
    PWME=0b00000000;
    PWMPRCLK=0b00110011;
    PWMSCLA=0b00001111;
    PWMSCLB=0b00001111;
    PWMCLK=0b00000001;
    PWMPOL=0b00000111;
    PWMCAE=0b00000000;
   
    PWMPER0=250WMDTY0=0;
    PWMPER1=250WMDTY0=0;
    PWMPER2=250WMDTY0=0;
   
    PWMDTY0=62;
    PWMDTY1=125;
    PWMDTY2=187;
    PWME=0b00000111;
  }
 
代码如上，想试验ECT的时间中断和PWM输出，都无法实现。RTI倒实现的比较方便（暂时先屏蔽了），麻烦大侠帮我看看，奇怪死了。

zangsir

还是想不通，刚才查资料，对PORTT和PORTP之间的关系也混了，到底PWM用的是哪个？

yunfeng

请看手册23页，PORTP是专门的PWM通道 PORTT是Timer的通道。用PWM通道产生PWM波比较方便。

yunfeng

void PWM_Init(void)
{
  PWMCNT0 = 0;
  PWMDTY0 = 0x6B;             // Store initial value to the duty-compare register
  PWMPER0 = 0xFF;             // and to the period register
  // PWMPRCLK: ??=0,PCKB2=0,PCKB1=0,PCKB0=0,??=0,PCKA2=0,PCKA1=0,PCKA0=0
  PWMPRCLK = 0x00;            // Set prescaler register
  // PWMSCLA: BIT7=0,BIT6=1,BIT5=0,BIT4=0,BIT3=1,BIT2=0,BIT1=1,BIT0=1
  PWMSCLA = 0x4B;             // Set scale register
  PWMCLK_PCLK0 = 1;           // Select clock source
  PWME_PWME0 = 1;             // Run counter
}

 

#pragma CODE_SEG DEFAULT

void TIM_Init(void)
{
  TC0 = 0xC34F;          // Store given value to the compare register
  TC7 = 0xC34F;          // Store given value to the modulo register
  TSCR2_PR = 0X04;       // Store given value to the prescaler
  TFLG1 = 0x01;          // Reset interrupt request flag
  TIE_C0I = 1;           // Enable interrupt
  TIOS_IOS0 = 1;
  TSCR1_TEN = 1;         // Enable Timer
}

#pragma CODE_SEG __NEAR_SEG NON_BANKED

/* Interrupt section for this module. Placement will be in NON_BANKED area.*/
interrupt 8 void TI2_Interrupt(void)
{
  TFLG1 = 0x01;          // Reset interrupt request flag 
  //用户的中断程序

}

#pragma CODE_SEG DEFAULT

[此贴子已经被作者于2005-11-11 10:42:14编辑过]

raifystein

DDRP_DDRP0=1;
    PWME=0x01;
    PWMPRCLK=0x77;
    PWMPER0=0x3;
    PWMDTY0=0x1;
port p 0产生2高1低的pwm波.具体可以参考S12PWM_8B6CV1.pdf

碧落星空

我和楼主状况差不多etc同样不能实现

zangsir

清楚了
用的是48脚的单片，因此PWM用了PT口，但是用PT口需要使用到MODRR寄存器来作开关