tm_clk.c

华恒瑞科公司的S3C44B0开发板音频测试程序

#include "def.h"
#include "utils.h"
#include "44b.h"
#include "option.h"

static struct{
	U32 mclk;
	U32 pclk;
	U32 sclk;
	U32 freq;
} ClkPara;

static void set_pll(void)
{
	U32 i, j;
	
	if(ClkPara.mclk>255)
		ClkPara.mclk = 255;
	if(ClkPara.pclk>63)
		ClkPara.pclk = 63;
	if(ClkPara.sclk>3)
		ClkPara.sclk = 3;	
		
	j = ClkPara.sclk;
	i = 1;
	while(j--)
		i *= 2;
	
	ClkPara.freq = (EXT_OSC_CLK*(ClkPara.mclk+8))/((ClkPara.pclk+2)*i);
	if((ClkPara.freq>=90000000)||(ClkPara.freq<EXT_OSC_CLK)) {
		ClkPara.mclk = 114;
		ClkPara.pclk = 8;
		ClkPara.pclk = 1;
		ClkPara.freq = EXT_OSC_CLK*122/20;
	}
	
	rPLLCON = (ClkPara.mclk << 12) | (ClkPara.pclk << 4) | ClkPara.sclk;
}

void SystemClockInit(void)
{
	ClkPara.mclk = 88;
	ClkPara.pclk = 8;
	ClkPara.sclk = 1;
	set_pll();
}

U32 GetCpuClock(void)
{
	return ClkPara.freq;
}

U32 GetMasterClock(void)
{
	return GetCpuClock();
}

void TimerInit(U32 HZ)
{
	rTCON  	&= ~(0xf<<24);			//clear manual update bit, stop Timer5
	rTCFG0 	&= ~(0xff<<16);			//set Timer 4&5 prescaler 1/2
	rTCFG0  |= 1<<16;
	rTCFG1 	&= ~(0xf<<20);			//set Timer 5 MUX 1/16
	rTCFG1  |= 3<<20;
	rTCNTB5	 = GetCpuClock()/(HZ*2*16)-1;
	rTCON	|= 2<<24;				//manual update
	rTCON	&= ~(2<<24);			//clear manal update bit
	rTCON   |= (5<<24);				//auto reload, inverter on, start Timer 5
}

/*void ResetTimer(void)
{
	rTCON &= ~(1<<24);
	rTCON |= (1<<24);
}*/

void Delay(U32 ms)
{
	U16 i;
	
	i = rTCNTB5>>1;	//1000us/2
	
	rTCON &= ~(1<<24);
	rTCON |= (1<<24);	//停止再启动,重装初值,减计数
	
	while(ms--) {
		while(rTCNTO5>=i);
		while(rTCNTO5<i);
	}
}

/*************************************************************/
#define	RTC_RW_EN()	(rRTCCON = 1)		//|= 1
#define	RTC_RW_DS()	(rRTCCON &= ~1)

void RtcSetDay(TIME_STRUC *time)
{
	RTC_RW_EN();				//RTC读写使能，选择BCD时钟、计数器，无复位，1/32768		
	rBCDYEAR = time->year&0xff;	//年
    rBCDMON  = time->month;		//月
    rBCDDAY  = time->day;		//日	
	RTC_RW_DS();
}

void RtcSetWeek(TIME_STRUC *time)
{
	RTC_RW_EN();
	rBCDDATE = time->weekday;
	RTC_RW_DS();
}

void RtcSetTime(TIME_STRUC *time)
{
	RTC_RW_EN();				//RTC读写使能，选择BCD时钟、计数器，无复位，1/32768		
	rBCDHOUR = time->hour;		//小时
    rBCDMIN  = time->min;		//分
    rBCDSEC  = time->sec;		//秒
	RTC_RW_DS();
}

void RtcGetTime(TIME_STRUC *time)
{
	unsigned char m;

	RTC_RW_EN();		//RTC读写使能
	time->year = 0x2000 + rBCDYEAR;
	time->weekday = rBCDDATE;

	m = rBCDMON;	
	time->month = m;//(m>>4)*10 + (m&0xf);	//BCD码转十进制

	m = rBCDDAY;	
	time->day = m;//(m>>4)*10 + (m&0xf);	//BCD码转十进制	

	m = rBCDHOUR;	
	time->hour = m;//(m>>4)*10 + (m&0xf);	//BCD码转十进制
	
	m = rBCDMIN;	
	time->min = m;//(m>>4)*10 + (m&0xf);	//BCD码转十进制

	m = rBCDSEC;			
	time->sec = m;//(m>>4)*10 + (m&0xf);	//BCD码转十进制
	
    RTC_RW_DS();		//RTC读写禁止(降低功率消耗)，选择BCD时钟、计数器，无复位，1/32768    

}