ds1337_driver.zip_For Real

// ------------------------------------------------------------------------------ // ds1337_driver.c // // Provides interface to DS1337 Real TimeClock IC. // // ------------------------------------------------------------------------------ #include "i2c_8051.h" #include "..\common_51\Com.h" //#include "..\common_51\Timing.h" //#include "..\common_51\hex_functions.h" #include "ds1337_driver.h" #include "51_flash.h" code char *weekday_names[ ] = { "Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat" }; date_time_t xdata *dtg; // ========================================================================== void ds1337_printDateTime( void ) { pprintf( "\r\nTime: %02X", (int)dtg->hours ); pprintf( ":%02X:%02X %s ", (int)dtg->minutes, (int)dtg->seconds, weekday_names[ (int)dtg->day ] ); pprintf( "%02X/%02X/%02X\r\n\n", (int)dtg->month, (int)dtg->date, (int)dtg->year ); } // ========================================================================== void ds1337_fprintfDT( void ) { DS1337_read_datetime( ); flprintf( "%02X:%02X:%02X ", (int)dtg->hours, (int)dtg->minutes, (int)dtg->seconds ); flprintf( " am %s ", weekday_names[ (int)dtg->day ] ); flprintf( "%02X/%02X/%02X ", (int)dtg->month, (int)dtg->date, (int)dtg->year ); } // ========================================================================== void DS1337_set_datetime( ) { // Convert the input date/time into BCD values that are formatted for // the DS1337 registers. ds1337_printDateTime( ); delay10mS( 2 ); // Write to the date and time registers. Disable interrupts so they // can't disrupt the i2c operations. EA = 0; I2C_Send_Start( ); I2C_Send_Byte( DS1337_I2C_WRITE_ADDR ); I2C_Send_Byte( DS1337_SECONDS_REG ); // Start at seconds register I2C_Send_Byte( ( dtg->seconds )); I2C_Send_Byte( ( dtg->minutes )); I2C_Send_Byte( ( dtg->hours )); I2C_Send_Byte( ( dtg->day )); I2C_Send_Byte( ( dtg->date )); I2C_Send_Byte( ( dtg->month )); I2C_Send_Byte( ( dtg->year )); I2C_Send_Stop( ); EA = 1; // re-enable interrupts } //---------------------------------------------- // Read the Date and Time from the hardware registers // in the DS1337. void DS1337_read_datetime( void ) { uchar xdata dtBuf[ 8 ]; delay10mS( 2 ); // Disable interrupts so the i2c process is not disrupted. EA = 0; I2C_SeqReadByte( DS1337_I2C_WRITE_ADDR, DS1337_SECONDS_REG, 7, &dtBuf ); dtg->seconds = dtBuf[ 0 ]; dtg->minutes = dtBuf[ 1 ]; dtg->hours = dtBuf[ 2 ]; dtg->day = dtBuf[ 3 ]; dtg->date = dtBuf[ 4 ]; dtg->month = dtBuf[ 5 ]; dtg->year = dtBuf[ 6 ]; delay10mS( 2 ); EA = 1; // re-enable interrupts delay10mS( 2 ); } //---------------------------------------------- // If there has been an oscillator failure since last // init, then init DS1337. A default time and date is set as well. void DS1337_init( void ) { EA = 0; // disable interrupts I2C_Send_Start( ); I2C_Send_Byte( DS1337_I2C_WRITE_ADDR ); I2C_Send_Byte( DS1337_SECONDS_REG ); I2C_Send_Byte( 0x00 ); // seconds I2C_Send_Byte( 0x00 ); // minutes I2C_Send_Byte( 0x40 ); // hours & select 12 hr mode I2C_Send_Byte( 0x00 ); // day I2C_Send_Byte( 0x01 ); // date I2C_Send_Byte( 0x01 ); // month I2C_Send_Byte( 0x16 ); // year I2C_Send_Byte( 0x00 ); // alm1 seconds I2C_Send_Byte( 0x00 ); // alm1 minutes I2C_Send_Byte( 0x00 ); // alm1 hours I2C_Send_Byte( 0x00 ); // alm1 day/date I2C_Send_Byte( 0x00 ); // alm2 minutes I2C_Send_Byte( 0x00 ); // alm2 hours I2C_Send_Byte( 0x00 ); // alm2 day/date I2C_Send_Byte( DS1337_CTRL_REG_INIT_VAL ); // Turn off the squarewave output pin. I2C_Send_Byte( DS1337_CLEAR_STATUS_VAL ); // Clear the status registers I2C_Send_Stop( ); EA = 1; } /* //---------------------------------------------- // If there has been an oscillator failure since last // init, then init DS1337. A default time and date is set as well. void DS1337_init_on_osc_fail( void ) { uchar xdata temp = 0; // Read the status register to see if the oscillator has failed. I2C_ReadByte( DS1337_I2C_WRITE_ADDR, DS1337_STATUS_REG, &temp ); // Unpack OSF bit temp = temp >> 7; // If oscillator has failed then init DS1337 if ( temp ) { DS1337_init( ); } } */