使用STC12C5A60S2做智能车的电机驱动，PWM如何接线？

只看该作者 · 2013-7-15 09:23

STC可以输出1KHz的占空比可调的波形，现在连接控制板，不知道怎么加？
用的电机是飞思卡尔A车自带的，驱动板也是配套的。

驱动板是这个，从这里买的：item.taobao.com/item.htm?id=14591428156

问题：
1、PWM给电机的限流电阻应该怎么加？
上拉一个还是直接在PWM引脚和电机驱动板PWM口串联一个？
2、电阻值选多大，多少功率的电阻，1W？

只看该作者 · 2013-7-16 21:31

这个是我们做飞思卡尔车用的驱动原理图，PWM是通过74HC244芯片接过去的

只看该作者 · 2013-7-28 22:18

/*------------------------------------------------------------------*/
/* --- STC MCU Limited ---------------------------------------------*/
/* --- STC12C5Axx Series MCU PCA module output PWM wave Demo -------*/
/* --- Mobile: (86)13922805190 -------------------------------------*/
/* --- Fax: 86-755-82905966 ----------------------------------------*/
/* --- Tel: 86-755-82948412 ----------------------------------------*/
/* --- Web: www.**.com -----------------------------------------*/
/* If you want to use the program or the program referenced in the  */
/* article, please specify in which data and procedures from STC */
/*------------------------------------------------------------------*/

#include "reg51.h"
#include "intrins.h"

#define FOSC 18432000L

typedef unsigned char BYTE;
typedef unsigned int WORD;

/*Declare SFR associated with the PCA */
sfr CCON       = 0xD8;          //PCA control register
sbit CCF0    = CCON^0;       //PCA module-0 interrupt flag
sbit CCF1    = CCON^1;       //PCA module-1 interrupt flag
sbit CR       = CCON^6;       //PCA timer run control bit
sbit CF       = CCON^7;       //PCA timer overflow flag
sfr CMOD       = 0xD9;          //PCA mode register
sfr CL       = 0xE9;          //PCA base timer LOW
sfr CH       = 0xF9;          //PCA base timer HIGH
sfr CCAPM0    = 0xDA;          //PCA module-0 mode register
sfr CCAP0L    = 0xEA;          //PCA module-0 capture register LOW
sfr CCAP0H    = 0xFA;          //PCA module-0 capture register HIGH
sfr CCAPM1    = 0xDB;          //PCA module-1 mode register
sfr CCAP1L    = 0xEB;          //PCA module-1 capture register LOW
sfr CCAP1H    = 0xFB;          //PCA module-1 capture register HIGH
sfr PCAPWM0    = 0xf2;
sfr PCAPWM1    = 0xf3;

void main()
{
CCON = 0;                      //Initial PCA control register
                                 //PCA timer stop running
                                 //Clear CF flag
                                 //Clear all module interrupt flag
CL = 0;                      //Reset PCA base timer
CH = 0;
CMOD = 0x02;                   //Set PCA timer clock source as Fosc/2
                                 //Disable PCA timer overflow interrupt
CCAP0H = CCAP0L = 0x80;       //PWM0 port output 50% duty cycle square wave
CCAPM0 = 0x42;                //PCA module-0 work in 8-bit PWM mode and no PCA interrupt

CCAP1H = CCAP1L = 0xff;       //PWM1 port output 0% duty cycle square wave
PCAPWM1 = 0x03;
CCAPM1 = 0x42;                //PCA module-1 work in 8-bit PWM mode and no PCA interrupt

CR = 1;                      //PCA timer start run

while (1);
}

只看该作者 · 2013-8-3 12:32

谢谢楼上！现在已经解决了。我们发现上面那个板子每个输入都接了一个10K的电阻，所以不用接了。直接写程序。下面是我写的，可看下。

//马达车速控制模块

#include "Motor.h"
#include "STC12C5A.h"
#include "intrins.h"

//马达初始化
void Motor_init(void)
{
P1M1 &= ~(1<<1);
P1M1 &= ~(1<<2);
P1M0 |= (1<<1);
P1M0 |= (1<<2);
}
//PWM初始化设置
void PWM_init(void)
{
CCON = 0x00;                   //Initial PCA control register
                                 //PCA timer stop running
                                 //Clear CF flag
                                 //Clear all module interrupt flag
CL = 0;                      //Reset PCA base timer
CH = 0;
CMOD = 0x00;                   //Set PCA timer clock source as Fosc/12
                                 //Disable PCA timer overflow interrupt
CCAP0H = CCAP0L = 0x80;       //PWM0 port output 50% duty cycle square wave
CCAPM0 = 0x42;                //PCA module-0 work in 8-bit PWM mode and no PCA interrupt

//CCAP1H = CCAP1L = 0xe0;       //PWM1 port output *% duty cycle square wave
//PCA_PWM1 = 0x03;
//CCAPM1 = 0x42;                //PCA module-1 work in 8-bit PWM mode and no PCA interrupt

CR = 1;                      //PCA timer start run
}

//马达正转
void Motor_foreward(void)
{
IN1 = 1;
IN2 = 0;
}
//马达反转
void Motor_rollback(void)
{
IN1 = 0;
IN2 = 1;
}
//马达停止
void Motor_stop(void)
{
IN1 = 0;
IN2 = 0;
}
//马达转速设定
void Motor_speed_set(unsigned char speed_8)
{
CCAP0H = 255 - speed_8;
}
//马达加速
void Motor_speed_up(unsigned char up_value)
{
if((CCAP0H <= (up_value+0x40))||(CCAP0H <=0x50))
CCAP0H = 0x40;
else
CCAP0H -= up_value;
}
//马达减速
void Motor_speed_cut(unsigned char cut_value)
{
if((255-CCAP0H) <= cut_value)
CCAP0H = 0xFF;
else
CCAP0H += cut_value;
}

使用STC12C5A60S2做智能车的电机驱动，PWM如何接线？

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