KONAMI
Joined: 29 Aug 2010
Posts: 11
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| FLEX I2C Memory Driver |
 Posted: Fri Sep 06, 2013 9:41 am |
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This is CCS C 2464 Driver that i just modify. Modifications allow you to use many memory in the same I2C bus. Each memory should have it hardware address. For example if we want to use 8 Memory, We have to use this combination of bits.
E2 E1 E0
0 0 0 Memory0 (dev adr=00)
.
.
.
1 1 1 Memory7 (dev adr=7)
| Code: |
///////////////////////////////////////////////////////////////////////////
//// Library for a 24LC64 serial EEPROM ////
//// ////
//// init_ext_eeprom(); Call before the other functions are used ////
//// ////
//// write_ext_eeprom(a, d); Write the byte d to the address a ////
//// ////
//// d = read_ext_eeprom(a); Read the byte d from the address a ////
//// ////
//// The main program may define eeprom_sda ////
//// and eeprom_scl to override the defaults below. ////
//// ////
///////////////////////////////////////////////////////////////////////////
//// (C) Copyright 1996,2003 Custom Computer Services ////
//// This source code may only be used by licensed users of the CCS C ////
//// compiler. This source code may only be distributed to other ////
//// licensed users of the CCS C compiler. No other use, reproduction ////
//// or distribution is permitted without written permission. ////
//// Derivative programs created using this software in object code ////
//// form are not restricted in any way. ////
///////////////////////////////////////////////////////////////////////////
#ifndef EEPROM_SDA
#define EEPROM_SDA PIN_C1
#define EEPROM_SCL PIN_C0
#endif
#use i2c(master, sda=EEPROM_SDA, scl=EEPROM_SCL)
#define EEPROM_ADDRESS long int
#define EEPROM_SIZE 8192
void init_ext_eeprom()
{
output_FLOAT(EEPROM_SCL);
output_FLOAT(EEPROM_SDA);
}
void write_ext_eeprom(long int address, BYTE data,int dev_adr)
{
short int status;
i2c_start();
i2c_write(0xa0|dev_adr<<1);
i2c_write(((address>>8)&0x1f)|dev_adr<<5);
i2c_write(address);
i2c_write(data);
i2c_stop();
i2c_start();
status=i2c_write(0xa0|dev_adr<<1);
while(status==1)
{
i2c_start();
status=i2c_write(0xa0|dev_adr<<1);
}
i2c_stop();
}
BYTE read_ext_eeprom(long int address,int dev_adr) {
BYTE data;
i2c_start();
i2c_write(0xa0|dev_adr<<1);
i2c_write(((address>>8)&0x1f)|dev_adr<<5);
i2c_write(address);
i2c_start();
i2c_write(0xa1|dev_adr<<1);
data=i2c_read(0);
i2c_stop();
return(data);
} |
Now how to use it?
To write/read at memory with dev_adr=00, this is the code
| Code: |
dev_adr=0;
write_ext_eeprom(adress, data,dev_adr);// adress: where you will write Byte data,dev_adr is the Hardware adress |
Enjoy. |
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