main.c

AT91RM9200的DS1307 RTC 测试代码

//*----------------------------------------------------------------------------
//*         ATMEL Microcontroller Software Support  -  ROUSSET  -
//*----------------------------------------------------------------------------
//* The software is delivered "AS IS" without warranty or condition of any
//* kind, either express, implied or statutory. This includes without
//* limitation any warranty or condition with respect to merchantability or
//* fitness for any particular purpose, or against the infringements of
//* intellectual property rights of others.
//*----------------------------------------------------------------------------
//* File Name           : main.c
//* Object              : Basic twi example. Write a byte into EEPROM and read it
//* Creation            : NL   25/11/02
//* 1.1 31/03/03 JPP	: Add DBGU message 
//*----------------------------------------------------------------------------
#include "main.h"
#include "twi.h"

//*=========================================================
//*		INIT
//*=========================================================
//*----------------------------------------------------------------------------
//* \fn    AT91F_SetTwiClock
//* \brief Initialization
//*----------------------------------------------------------------------------
void AT91F_SetTwiClock(const AT91PS_TWI pTwi)
{
	int sclock;

	/* Here, CKDIV = 1 and CHDIV=CLDIV  ==> CLDIV = CHDIV = 1/4*((Fmclk/FTWI) -6)*/

	sclock = (10*AT91C_MASTER_CLOCK /AT91C_TWI_CLOCK);
	if (sclock % 10 >= 5)
		sclock = (sclock /10) - 5;
	else
		sclock = (sclock /10)- 6;
	sclock = (sclock + (4 - sclock %4)) >> 2;	// div 4

    pTwi->TWI_CWGR	= 0x00010000 | sclock | (sclock << 8);
}
int main()
{
	int loop;
	unsigned int tick;	
	//unsigned short write, read;
	char write[8], read[7];
	
	uprintf("\n\n\r");	
	uprintf("======================================================\n\r");
	uprintf("==           欢迎使用英贝德公司的产品               ==\n\r");
	uprintf("==  下面开始AT91RM9200板实时时钟DS1307的测试（I2C） ==\n\r");	
	uprintf("==       Begin to Start DS1307 test,OK? (Y/N)       ==\n\r");	
	uprintf("======================================================\n\r");

	// Configure TWI PIOs
	AT91F_TWI_CfgPIO ();
	AT91F_PIO_CfgOpendrain(AT91C_BASE_PIOA, (unsigned int) AT91C_PA25_TWD);

	// Configure PMC by enabling TWI clock
	AT91F_TWI_CfgPMC ();
	
	// Configure TWI in master mode
	AT91F_TWI_Configure (AT91C_BASE_TWI);
		
	// Set TWI Clock Waveform Generator Register	
	AT91F_SetTwiClock(AT91C_BASE_TWI);

	AT91F_DBGU_Printk("DS1307 ready\n\r");	
	for(loop=0;loop<7;loop++)
	{
	 read[loop] = 0;
	}
	
	AT91F_TWI_Read(AT91C_BASE_TWI, 0x00,read, 8);
	if((read[6]!=0x05)){		
	//set time
	write[0] = 0x05;//second
	write[1] = 0x53;//minutes
	write[2] = 0x8;//hours
	write[3] = 0x2;//day
	write[4] = 0x6;//date
	write[5] = 0x09;//month
	write[6] = 0x05;//year
	
	write[7] = 0x80;//contrl	
	// Write a byte and read it 
	//AT91F_TWI_Write(AT91C_BASE_TWI, 0x0, (char *)&write, 2);
	AT91F_TWI_Write(AT91C_BASE_TWI, 0x00,write, 7);
	
	// Wait 10 ms before data is written into DS1307
	uprintf("Wait at least before value is written into DS1307\n\r");
	for (loop=0; loop<10000; loop++);	
	}

	while (1)	// Set sequential part here
	{
			for(loop=0;loop<7;loop++)
			{
	 			read[loop] = 0;
	 		}
	 		
	 		
		tick = *(AT91C_ST_CRTR);		
		while (tick == *(AT91C_ST_CRTR)); //每秒显示一次		
	 		
	 		
		AT91F_TWI_Read(AT91C_BASE_TWI, 0x00,read, 8);

		uprintf("\n\r200%x年  %x月 %x日  星期%x  %x时  %x分 %x秒\n\r",
					read[6],read[5],read[4],read[3],read[2],read[1],read[0]);
	}
}
//* EOF