RTC rx8025 (I/O simulation IIC)

 

/*************************************** **************************************** ***********
* Function name: i2c_delay
* Function description:
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Void i2c_delay (uint32 waittime)
{
Uint32 uitemp = waittime * small;
While (uitemp --);
}
/*************************************** **************************************** ***********
* Function name: io_write
* Function description:
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Void io_write (uint16 data, uint16 level)
{
Switch (data)
{
Case i2c_sda:
{
Switch (level)
{
Case high:
Io0set | = i2c_sda;
I2c_delay (5 );
Break;
Case low:
Io0clr | = i2c_sda;
I2c_delay (5 );
Break;
}
} // End case
Break;
Case i2c_scl:
{
Switch (level)
{
Case high:
Io0set | = i2c_scl;
I2c_delay (5 );
Break;
Case low:
Io0clr | = i2c_scl;
I2c_delay (5 );
Break;
}
} // End case
Break;
}
}

/*************************************** **************************************** ***********
* Function name: i2c_stop
* Function description:
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Void i2c_stop (void) // I2C bus operation stop bit sending
{
Io_write (i2c_sda, low); // SDA = low

Io_write (i2c_scl, high); // SCL = high
I2c_delay (10 );

Io_write (i2c_sda, high); // SDA = high
I2c_delay (5 );

Io_write (i2c_scl, low); // SCL = low
I2c_delay (5 );
}

/*************************************** **************************************** ***********
* Function name: i2c_start
* Function description:
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Void i2c_start (void)
{
I2c_stop ();
I2c_delay (5 );

Io_write (i2c_sda, high); // SDA = high
I2c_delay (5 );
 
Io_write (i2c_scl, high); // SCL = high
I2c_delay (5 );
 
Io_write (i2c_sda, low); // SDA = low
I2c_delay (5 );
 
Io_write (i2c_scl, low); // SCL = low
I2c_delay (5 );
}

/*************************************** **************************************** ***********
* Function name: i2c_clock
* Function description:
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Void i2c_clock (void)
{
I2c_delay (5); // SCL = high-> low

Io_write (i2c_scl, high); // SCL = high
I2c_delay (5 );

Io_write (i2c_scl, low); // SCL = low
I2c_delay (2 );
}
/*************************************** **************************************** ***********
* Function name: i2c_clock_ask
* Function description:
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Uint8 i2c_clock_ask (void)
{
Uint8 status;

I2c_delay (5 );
Io_write (i2c_scl, high); // SCL = high
I2c_delay (5 );
 
Switch (io0pin & i2c_sda) & i2c_sda)
{
Case (1 <14 ):
Status = i2cnoack; // return i2cnoack
Break;

Case (0x00 ):
Status = i2cack; // return i2cack
Break;
}
Io_write (i2c_scl, low); // SCL = low
I2c_delay (5 );
Return (Status );
}

/*************************************** **************************************** ***********
* Function name: i2c_ack
* Function description:
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Void i2c_ack (uint8 status)
{
Switch (Status)
{
Case (i2cack ):
Io_write (i2c_sda, low); // SDA = low has a response
Break;

Case (i2cnoack ):
Io_write (i2c_sda, high); // SDA = high no response
Break;
}
I2c_delay (5 );

Io_write (i2c_scl, high); // SCL = high-> low
I2c_delay (5 );

Io_write (i2c_scl, low );
I2c_delay (5 );

Io_write (i2c_sda, high); // SDA = high
I2c_delay (5 );
}

/*************************************** **************************************** ***********
* Function name: i2c_send_8bit
* Function description:
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Uint8 i2c_send_8bit (uint8 value)
{
Uint8 i2c_loop;

For (i2c_loop = 0; i2c_loop <8; i2c_loop ++)
{
Switch (value <i2c_loop) & 0x80)
{
Case 0x80:
Io_write (i2c_sda, high );
Break;
Case 0x00:
Io_write (i2c_sda, low );
Break;
}
I2c_clock (); // sends a clock signal from the SCL Port
}
Io_write (i2c_sda, high); // release SDA
I2c_delay (10 );
Return (i2c_clock_ask (); // returns the ACK signal.
}

/*************************************** **************************************** ***********
* Function name: i2c_receive_8bit
* Function description:
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Uint8 i2c_receive_8bit (void)
{
Uint8 i2c_loop;
Uint8 value = 0x00;

Io_write (i2c_sda, high); // set the data line as the input method
 
For (i2c_loop = 0; i2c_loop <8; i2c_loop ++)
{
I2c_delay (5 );
Io_write (i2c_scl, low); // SCL = low-> high
I2c_delay (5 );

Io_write (i2c_scl, high );
I2c_delay (5 );

Value <= 1;
Switch (io0pin & i2c_sda) & i2c_sda)
{
Case (1 <14 ):
Value | = 0x01;
Break;

Case (0x00 ):
Value & = 0xfe;
Break;
}
I2c_delay (5 );
}
Io_write (i2c_scl, low); // SCL = low
I2c_delay (5 );
Return (value );
}

/*************************************** **************************************** ***********
* Function name: rtc8025_write_bytes
* Function description:
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Uint8 rtc8025_write_bytes (uint8 rtcaddr, uint8 Volue)
{
I2c_start (); // send the start bit to rtc

If (i2c_send_8bit (rtc8025_id) = i2cnoack) // send hardware address and write Signal
{
Return notok;
}
If (i2c_send_8bit (rtcaddr <4) & 0xf0) = i2cnoack) // the address of the sending operation register ("0 ")
{
Return notok;
}
If (i2c_send_8bit (Volue) = i2cnoack) // send hardware address and write Signal
{
Return notok;
}

I2c_stop (); // send a stop bit to rtc

Return (OK );
}
/*************************************** **************************************** ***********
* Function name: modify_rx8025time
* Function Description: clock Calibration
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Uint8 modify_rx8025time (rtc_struct * modify_time)
{
Uint8 h;

H = rtc8025_write_bytes (rtc8025_second, modify_time-> second); // modify "seconds"
If (H! = OK)
Return notok;

H = rtc8025_write_bytes (rtc8025_minute, modify_time-> minute); // modify "Minute"
If (H! = OK)
Return notok;

H = rtc8025_write_bytes (rtc8025_hour, modify_time-> hour); // modify "hour"
If (H! = OK)
Return notok;

H = rtc8025_write_bytes (rtc8025_day, modify_time-> day); // modify "date"
If (H! = OK)
Return notok;

H = rtc8025_write_bytes (rtc8025_month, modify_time-> month); // modify "month"
If (H! = OK)
Return notok;

H = rtc8025_write_bytes (rtc8025_year, modify_time-> year); // modify "year"
If (H! = OK)
Return notok;

Return (OK );
}

/*************************************** **************************************** ***********
* Function name: get_time
* Function Description: read time
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Uint8 get_time (rtc_struct * time_data)
{
Uint8 ucloop;
Uint8 Week;
Uint8 Pon;

For (ucloop = 0x01; ucloop> 0x00; ucloop --)
{
// Dummy_rtc.date.century = 0x00;
I2c_start (); // send the start bit to rtc
If (i2c_send_8bit (rtc8025_id) = i2cnoack) // send hardware address and write Signal
{
Continue;
}
If (i2c_send_8bit (uint8) (rtc8025_simple_read | (rtc8025_control2 <4) // send operation Register address and read mode
= I2cnoack)
{
Continue;
}
Pon = (i2c_receive_8bit () & rtc8025_pon)> 4; // power supply in read register 2
I2c_ack (i2cack );
Time_data-> second = i2c_receive_8bit (); // read "seconds"
I2c_ack (i2cack );
Time_data-> minute = i2c_receive_8bit (); // read "minutes"
I2c_ack (i2cack );
Time_data-> hour = i2c_receive_8bit (); // read "hour"
I2c_ack (i2cack );
Week = i2c_receive_8bit (); // read "Week"
I2c_ack (i2cack );
Time_data-> day = i2c_receive_8bit (); // read "date"
I2c_ack (i2cack );
Time_data-> month = i2c_receive_8bit (); // read "month"
I2c_ack (i2cack );
Time_data-> year = i2c_receive_8bit (); // read "year"
I2c_ack (i2cnoack );
Time_data-> century = 0x20; // The Century is set to 0x20.

I2c_stop (); // send a stop bit to rtc

}

Return OK;
}
/*************************************** **************************************** ***********
* Function name: rx8025_init
* Function Description: rx8025 Initialization
* Parameter: Parameter Name: input/output? Type description
*
* Return value:
* Author:
* Creation date: 2006-12-19
* Global variables:
* Global static variables:
* Local static variables:
* ---------------------------------------- Modification history ------------------------------------------
* Current version: modifier: modification date:
* Modification description:
**************************************** **************************************** **********/
Void rx8025_init (void)
{
Uint8 uctemp;
Io0dir | = i2c_sda | i2c_scl;
Io0clr = i2c_scl;

I2c_delay (1 );
I2c_stop ();
Uctemp = 0x20 | 0x02;
Rtc8025_write_bytes (rtc8025_control1, uctemp); // 24-hour mode setting, 1Hz frequency output
Uctemp = 0x20;
Rtc8025_write_bytes (rtc8025_control2, uctemp); // 2.1v Voltage Detection Mode and voltage effective mark (PON)
}