main.c

国嵌所有的实验代码

/*************************************************
Function name: 这是基础实验的一个模版
Parameter    : 无
Description  : 做基础实验，直接调用该模板即可
Return	     : 无
Argument     : 无
Autor & date : Daniel
**************************************************/
#define	GLOBAL_CLK		1
#include <stdlib.h>
#include <string.h>
#include "def.h"
#include "option.h"
#include "2440addr.h"
#include "2440lib.h"
#include "2440slib.h"
#include "mmu.h"
#include "profile.h"
#include "memtest.h"


#define ADC_FREQ 2500000



volatile U32 preScaler;

void adcINT_init(void);
static void __irq IRQ_ISR_ADC(void);
static void cal_cpu_bus_clk(void);
void Set_Clk(void);

/*************************************************
Function name: delay
Parameter    : times
Description	 : 延时函数
Return		 : void
Argument     : void
Autor & date : Daniel
**************************************************/
void delay(int times)
{
    int i,j;
    for(i=0;i<times;i++)
       for(j=0;j<400;j++);
}
/*************************************************
Function name: Main
Parameter    : void
Description	 : 主功能函数,实现UART初始化；实现ADC初始化
Return		 : void
Argument     : void
Autor & date : Daniel
**************************************************/
int Main(void)
{	
   
    int Scom=0;
    MMU_Init();
    Set_Clk();
    Uart_Init(0,115200);
    Uart_Select(Scom);
    //Uart_Printf("\nHello World!\n");
    
    adcINT_init();
    
	return 0;

}	

/*************************************************
Function name: adcINT_init()
Parameter    : void
Description	 : adc初始化
Return		 : void
Argument     : void
Autor & date : Daniel
**************************************************/ 
void adcINT_init(void)
{
	int channel=0; //AIN0，对应开发板上W1可调电阻
	
	preScaler = ADC_FREQ;
	Uart_Printf("ADC conv,freq. = %dHz\n",preScaler);
	preScaler = 50000000/ADC_FREQ - 1; //PCLK=50M
	
	Uart_Printf("PRSCVL=PCLK/ADC_FREQ - 1=%d\n",preScaler);
	
	/*AD转换频率设置*/
	rADCCON = (1<<14)|(preScaler<<6)|(channel<<3);	//setup channel
	delay(1000);
			


	rPRIORITY = 0x00000000;     // 默认优先级
    rINTMOD = 0x00000000;       // 默认IRQ中断
    
    /*清中断*/
    //ClearPending(BIT_ADC);
    rSRCPND = 0x80000000;
	rINTPND = 0x80000000;
    ClearSubPending(BIT_SUB_ADC);  
    
    /*中断服务程序*/
    pISR_ADC = (U32)IRQ_ISR_ADC;
    
    /*使能中断*/
    //EnableIrq(BIT_ADC);
    rINTMSK = 0x7fffffff;
    EnableSubIrq(BIT_SUB_ADC);
   
    

	/*开启AD转换*/
	rADCCON |= 0x01; //start ADC	
	while(rADCCON & 0x1);	//check if Enable_start is low
}
    
/*************************************************
Function name: IRQ_ISR_ADC()
Parameter    : void
Description	 : 中断服务子程序，该子程序的作用就是把
               获取AD 转换后的数据，通过uart0发送到PC机
Return		 : int
Argument     : void
Autor & date : Daniel
**************************************************/    
static void __irq IRQ_ISR_ADC(void)
{
	
	 if(rSUBSRCPND & (1<<10))
	    {
			Uart_Printf( "AIN0: %04d\n",(int)rADCDAT0 & 0x3ff );
			ClearSubPending(BIT_SUB_ADC);
			
			//ClearPending(BIT_ADC);
			rSRCPND = 0x80000000;
			rINTPND = 0x80000000;
		}
		
	 else
	 	Uart_Printf("Sorry,not INT_ADC irq\n");
 
	/*开启下一次AD转换*/   
	rADCCON |= 0x01; //start ADC	
	while(rADCCON & 0x1);	//check if Enable_start is low

}
/*************************************************
Function name: Set_Clk()
Parameter    : void
Description	 : 设置CPU的时钟频率
Return		 : void
Argument     : void
Autor & date : Daniel
**************************************************/
void Set_Clk(void)
{
	int i;
	U8 key;
	U32 mpll_val = 0 ;
	i = 2 ;	             //don't use 100M!
		                 //boot_params.cpu_clk.val = 3;
	switch ( i ) {
	case 0:	//200
		key = 12;
		mpll_val = (92<<12)|(4<<4)|(1);
		break;
	case 1:	//300
		key = 13;
		mpll_val = (67<<12)|(1<<4)|(1);
		break;
	case 2:	//400
		key = 14;
		mpll_val = (92<<12)|(1<<4)|(1);
		break;
	case 3:	//440!!!
		key = 14;
		mpll_val = (102<<12)|(1<<4)|(1);
		break;
	default:
		key = 14;
		mpll_val = (92<<12)|(1<<4)|(1);
		break;
	}
	
	//init FCLK=400M, so change MPLL first
	ChangeMPllValue((mpll_val>>12)&0xff, (mpll_val>>4)&0x3f, mpll_val&3);   //set the register--rMPLLCON
	ChangeClockDivider(key, 12);    //the result of rCLKDIVN [0:1:0:1] 3-0 bit
	cal_cpu_bus_clk();    //HCLK=100M   PCLK=50M
}
/*************************************************
Function name: cal_cpu_bus_clk
Parameter    : void
Description	 : 设置PCLK\HCLK\FCLK的频率
Return		 : void
Argument     : void
Autor & date : Daniel
**************************************************/
static void cal_cpu_bus_clk(void)
{
	static U32 cpu_freq;
    static U32 UPLL;
	
	U32 val;
	U8 m, p, s;
	
	val = rMPLLCON;
	m = (val>>12)&0xff;
	p = (val>>4)&0x3f;
	s = val&3;

	//(m+8)*FIN*2 不要超出32位数!
	FCLK = ((m+8)*(FIN/100)*2)/((p+2)*(1<<s))*100;     //FCLK=400M  FIN=12000000
	
	val = rCLKDIVN;
	m = (val>>1)&3;
	p = val&1;	
	val = rCAMDIVN;
	s = val>>8;
	
	switch (m) {
	case 0:
		HCLK = FCLK;
		break;
	case 1:
		HCLK = FCLK>>1;
		break;
	case 2:
		if(s&2)
			HCLK = FCLK>>3;
		else
			HCLK = FCLK>>2;
		break;
	case 3:
		if(s&1)
			HCLK = FCLK/6;
		else
			HCLK = FCLK/3;
		break;
	}
	
	if(p)
		PCLK = HCLK>>1;
	else
		PCLK = HCLK;
	
	if(s&0x10)
		cpu_freq = HCLK;
	else
		cpu_freq = FCLK;
		
	val = rUPLLCON;
	m = (val>>12)&0xff;
	p = (val>>4)&0x3f;
	s = val&3;
	UPLL = ((m+8)*FIN)/((p+2)*(1<<s));
	UCLK = (rCLKDIVN&8)?(UPLL>>1):UPLL;
	Uart_Printf("\nFCLK:%dMHz,HCLK:%dMHz,PCLK=%dMHZ\n",FCLK/1000/1000,HCLK/1000/1000,PCLK/1000/1000);
}