lqinit.c

智能车源程序参考

/********************************************************
龙丘MC9S12(DG128)多功能开发板V4.0  
Designed by Chiu Sir
E-mail:[e-mail]
软件版本:V1.1
最后更新:2008年12月26日
相关信息参考下列地址：
博客：  http://longqiu.21ic.org
淘宝店：http://shop36265907.taobao.com
------------------------------------
Code Warrior 4.7
Target : MC9S12DG128B
Crystal: 16.000Mhz
busclock:16.000MHz
pllclock:32.000MHz 
*********************************************************/
#include <hidef.h>
#include <mc9s12dg128.h>  

//-----------------------------------------------------
static void SCI_Init(void) 
{
    SCI0CR2=0x2c; //enable Receive Full Interrupt,RX enable,Tx enable
    SCI0BDH=0x00; //busclk  8MHz,19200bps,SCI0BDL=0x1a
    SCI0BDL=0x68; //SCI0BDL=busclk/(16*SCI0BDL)
                  //busclk  8MHz, 9600bps,SCI0BDL=0x34
                  //busclk  8MHz, 9600bps,SCI0BDL=0x68
                  //busclk 24MHz, 9600bps,SCI0BDL=0x9C
}                 //busclk 32MHz, 9600bps,SCI0BDL=0xD0
//----------------------------------------------------- 
static void Port_Init(void)
{   
    DDRA = 0xff;  //LCD1100,PA0--4,PA67 D1D2
    PORTA= 0x00;   
       
    DDRB = 0xff;  //LED  PTB0--7,
    PORTB= 0xff;  //LEDs on  
   
    DDRE = 0xFF;  //MOTOR CONTROL
    PORTE= 0x00;  //P      
    
    DDRH = 0x00; // PORTH input
    PTIH = 0X00; // KEY,PH0--5
    PERH = 0xff; // PORTH pull up  
    PPSH = 0x00; // Port H Polarity Select Register-falling edge
    PIEH = 0x00; // PORTH interrut disable but 1, 
}
//----------------------------------------------------- 
static void PWM_Init(void)
{     
    //SB,B for ch2367
    //SA,A for ch0145   
      
    PWMCTL_CON01=1;		  //0和1联合成16位PWM；
    PWMCAE_CAE1=0;			//选择输出模式为左对齐输出模式
    PWMCNT01 = 0;				//计数器清零；
    PWMPOL_PPOL1=1;			//先输出高电平，计数到DTY时，反转电平
    PWMPRCLK = 0X40;    //clockA不分频,clockA=busclock=16MHz;CLK B 16分频:1Mhz   
    PWMSCLA = 8;        //对clock SA 进行2*8=16分频；pwm clock=clockA/16=1MHz;     
    PWMCLK_PCLK1 = 1;   //选择clock SA做时钟源
    PWMPER01  =  20000;   //周期20ms； 50Hz;(可以使用的范围：50-200hz)
    PWMDTY01  =  1510;   //高电平时间为1.5ms;  
    PWME_PWME1 = 1;        
} 
//-----------------------------------------------------
// PLL初始化子程序   BUS Clock=16M
void setbusclock(void)
{   
    CLKSEL=0X00;				//disengage PLL to system
    PLLCTL_PLLON=1;			//turn on PLL
    SYNR=1;										
    REFDV=1;		        //pllclock=2*osc*(1+SYNR)/(1+REFDV)=32MHz;
    _asm(nop);          //BUS CLOCK=16M
    _asm(nop);
    while(!(CRGFLG_LOCK==1));	  //when pll is steady ,then use it;
    CLKSEL_PLLSEL =1;		        //engage PLL to system; 
}
//-----------------------------------------------------
#pragma CODE_SEG DEFAULT
void Init_Dev(void)
{
    setbusclock();
    Port_Init();
    SCI_Init();
    PWM_Init();     
}

//-----------------------------------------------------