rtc4513.c

在PXA270上替换开发板的实时时钟RTC4513为DS1302的修改说明,自己写的,拿上来和大家共享,也希望大家提意见

#include    <windows.h>
#include	<types.h>
#include    <memory.h>
#include    <nkintr.h>
#include	<oal.h>
#include    <bulverde.h>
#include    "xllp_gpio.h"
#include	"xsbase270_g.h"


#define RTC_SDA		(XLLP_BIT_9)  //gpio9

#define RTC_GET_TIME		0x1
#define RTC_SETTING_TIME	0x2
#define RTC_CE              (1<<0)  // 
#define RTC_CLK             (1<<1)  // 

#define TWH			10
#define TWL			10
#define TCS			15
#define TCH			20
#define TCR			30
#define TCKS			20
#define TCKH			20
#define TDS			50
#define TDH			50
#define TRD			25
#define TRZ			10
#define TRF			20

#define RTC_WR_MODE             0x3
#define RTC_RD_MODE             0xc

#define RTC4513_S1              0x0
#define RTC4513_S10             0x1
#define RTC4513_MI1             0x2
#define RTC4513_MI10            0x3
#define RTC4513_H1              0x4
#define RTC4513_H10             0x5
#define RTC4513_D1              0x6
#define RTC4513_D10             0x7
#define RTC4513_MO1             0x8
#define RTC4513_MO10            0x9
#define RTC4513_Y1              0xa
#define RTC4513_Y10             0xb
#define RTC4513_W               0xc
#define RTC4513_CD              0xd
#define RTC4513_CE              0xe
#define RTC4513_CF              0xf

static volatile UINT8 *g_pRTCBCRegs = NULL;
static volatile BULVERDE_GPIO_REG    *g_pGPIORegs = NULL;
static volatile UINT8 *g_pRTCRegs = NULL;

//static int bcr=0;

#define XSBASE270_RTC_SETBIT(x) \
{ \
	*g_pRTCBCRegs |= (x); \
	*g_pRTCRegs = *g_pRTCBCRegs; \
}
#define XSBASE270_RTC_CLEARBIT(x) \
{ \
	*g_pRTCBCRegs &= ~(x); \
	*g_pRTCRegs = *g_pRTCBCRegs; \
}

static void Wait(UINT32 microSeconds)
{
    volatile UINT32 *TimerOSCRAddress= (volatile UINT32 *) OALPAtoVA((BULVERDE_BASE_REG_PA_OST + 0x10), FALSE);
    UINT32 Value, Time;

    Time   = *TimerOSCRAddress;
    Value = Time + (microSeconds * 4);
    if (Value < Time)
    {  // test for wrap.
        while (Time < *TimerOSCRAddress);
    }
    while (*TimerOSCRAddress <= Value);

}

void RTC_Enable(void)
{
    g_pGPIORegs->GPDR0 |= RTC_SDA;
    g_pGPIORegs->GPCR0 |= RTC_SDA;
    Wait(TCKS);
    XSBASE270_RTC_SETBIT(RTC_CE);    
    Wait(TCS);
}

void RTC_Disable(void)
{
    g_pGPIORegs->GPDR0 |= RTC_SDA;
    g_pGPIORegs->GPCR0 |= RTC_SDA;
    Wait(TCH);
    XSBASE270_RTC_CLEARBIT(RTC_CE);
    Wait(TCR);
}

unsigned long read_nbits(int nbit) {
	
    unsigned long data = 0;
    int  i;
	
    g_pGPIORegs->GPDR0 &= ~RTC_SDA;
    for(i = 0; i < nbit; i++){
		XSBASE270_RTC_SETBIT(RTC_CLK);    	
		Wait(TWH);
		data |= (((g_pGPIORegs->GPLR0  & RTC_SDA)!=0) ? 0x01<<i:0);
		XSBASE270_RTC_CLEARBIT(RTC_CLK);		
		Wait(TWL);
	}
    Wait(TRZ);
    return(data);
}

int read_4bits(void)
{
    return read_nbits(4);
}

void write_nbits(unsigned long put_data, int nbit) /* n bit instruction set download */
{
    int i;
	
    g_pGPIORegs->GPDR0 |= RTC_SDA;
    for(i=0; i < nbit; i++){
        if(put_data & (0x01<<i))
            g_pGPIORegs->GPSR0 |= RTC_SDA;
        else
            g_pGPIORegs->GPCR0 |= RTC_SDA;
		
        Wait(TDS);
		XSBASE270_RTC_SETBIT(RTC_CLK);     
        Wait(TWH);
		XSBASE270_RTC_CLEARBIT(RTC_CLK);
        Wait(TWL);
    }
}

void write_4bits(char data)
{
    write_nbits(data, 4);
}

char read_register(char address)
{
    char ret;
	
    g_pGPIORegs->GPCR0 |= RTC_SDA;
    XSBASE270_RTC_CLEARBIT(RTC_CLK);
	
    RTC_Enable();
	
    write_4bits(RTC_RD_MODE);
    write_4bits(address);
	
    ret = read_4bits();
	
    RTC_Disable();
	
    return ret;
}

void read_register_close(void)
{
    RTC_Disable();
}

void write_register(char address, char data)
{
    g_pGPIORegs->GPCR0 |= RTC_SDA;
    XSBASE270_RTC_CLEARBIT(RTC_CLK);
	
    RTC_Enable();
	
    write_4bits(RTC_WR_MODE);
    write_4bits(address);
    write_4bits(data);
	
    RTC_Disable();
}

void RTC4513GetRealTime(LPSYSTEMTIME lpst)
{
	
	lpst->wYear      = read_register(RTC4513_Y1) + read_register(RTC4513_Y10) * 10 +2000; 
	lpst->wMonth     = read_register(RTC4513_MO1)+ read_register(RTC4513_MO10) * 10 + 1; 
	lpst->wDayOfWeek = read_register(RTC4513_W)-1;
	lpst->wDay       = read_register(RTC4513_D1)+ read_register(RTC4513_D10) * 10 + 1 ;
	lpst->wHour      = read_register(RTC4513_H1)+ read_register(RTC4513_H10) * 10;
	lpst->wMinute    = read_register(RTC4513_MI1)+ read_register(RTC4513_MI10) * 10;
	lpst->wSecond    = read_register(RTC4513_S1)+ read_register(RTC4513_S10) * 10;
	lpst->wMilliseconds = 0;
	
#if 0
	RETAILMSG(1,(TEXT("RTC4513GetRealTime: Year: %u, Month: %u, Day: %u, Hour: %u, Minute: %u, second: %u \r\n"),
		lpst->wYear, lpst->wMonth,lpst->wDay, lpst->wHour, lpst->wMinute,lpst->wSecond));
#endif			
	
	return;
}

void RTC4513SetRealTime(LPSYSTEMTIME lpst)
{
	
	lpst->wYear  = lpst->wYear % 100;
	lpst->wDay  = lpst->wDay - 1;	
	lpst->wMonth  = lpst->wMonth - 1;		
	
	write_register(RTC4513_CF, 0x7);        // 24h, stop, reset
	write_register(RTC4513_S1, lpst->wSecond%10);
	write_register(RTC4513_S10, lpst->wSecond/10);
	write_register(RTC4513_MI1, lpst->wMinute%10);
	write_register(RTC4513_MI10, lpst->wMinute/10);
	write_register(RTC4513_H1, lpst->wHour%10);
	write_register(RTC4513_H10, lpst->wHour/10);
	write_register(RTC4513_D1, lpst->wDay%10);
	write_register(RTC4513_D10, lpst->wDay/10);
	write_register(RTC4513_MO1, lpst->wMonth%10);
	write_register(RTC4513_MO10, lpst->wMonth/10);
	write_register(RTC4513_W,   lpst->wDayOfWeek+1);
	write_register(RTC4513_Y1, (lpst->wYear ) %10);
	write_register(RTC4513_Y10, (lpst->wYear )/10);
	write_register(RTC4513_CF, 0x4);	// 24h
	write_register(RTC4513_CD, 0x2);	// ADJ, IRQ-F, CAL/HW, HOLD	
	
#if 0
	RETAILMSG(1,(TEXT("RTC4513SetRealTime: Year: %u, Month: %u, Day: %u, Hour: %u, Minute: %u, second: %u \r\n"),
		lpst->wYear, lpst->wMonth,lpst->wDay, lpst->wHour, lpst->wMinute,lpst->wSecond));
#endif	
	
	return;
}	




void RTC4513_Init(void)
{		
	g_pGPIORegs = (volatile BULVERDE_GPIO_REG *) OALPAtoVA(BULVERDE_BASE_REG_PA_GPIO, FALSE);
	g_pRTCBCRegs = (volatile UINT8 *) OALPAtoVA(0xa3ff0000, FALSE);
	g_pRTCRegs = (volatile UINT8 *) OALPAtoVA(0x10200000, FALSE);
	
	if(!g_pGPIORegs || !g_pRTCBCRegs ||!g_pRTCRegs)
	{
		RETAILMSG(1, (L"Error in Init RTC4513!\r\n"));
		return;
	}
//	RETAILMSG(1,(L"+++++++rtc init\r\n"));
	*g_pRTCBCRegs = 0;
//	RETAILMSG(1,(L"---------rtc init\r\n"));
	g_pGPIORegs->GAFR0_L &=~(0x000C0000);
}