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| EEPROM / PIC newbie question |
 Posted: Wed Jun 15, 2005 10:18 am |
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EEPROM Block and Address
Posted: Wed Jun 15, 2005 7:43 am
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*** THIS IS FROM OTHER POST THREAD *** PCM recommand to use a
new thread, I post it here, these 2 post are mine, I guess you know what exactly information I want, any suggestion is welcome 'cause I am new to EEPROM and PIC *********
Sorry for the basic question but I need some explaination..
I am new to EEPROM and PIC, after I read the previous post and some datasheet for 24LC01B and 24LC256 with I2C interface. The control byte or the device address always be 1010 for eeprom. Example the 24LC01 is a 1Kbit device.
The questions I have are,
1. How do I identify the block?
2. How do I identify the word address? (starting address like 0x00, 0x01, or what?)
3. How many blocks and how many word can it stores? Code:
| Code: | void write_ext_eeprom(BYTE address, BYTE data) {
while(!ext_eeprom_ready());
i2c_start();
i2c_write(0xa0);
i2c_write(address); == > ??? what address do I need to start with?????
i2c_write(data);
i2c_stop();
}
BYTE read_ext_eeprom(BYTE address) {
BYTE data;
while(!ext_eeprom_ready());
i2c_start();
i2c_write(0xa0);
i2c_write(address); == > ??? what address do I need to start with?????
i2c_start();
i2c_write(0xa1);
data=i2c_read(0);
i2c_stop();
return(data);
}
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I couldn't find the information on the 24LC01, 24LC256 datasheet.
Thanks |
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Guest
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| Posted: Wed Jun 15, 2005 10:20 am |
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How to use EEPROM with PIC
Posted: Wed Jun 15, 2005 10:12 am
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Sorry for the newbie question, but I need help to understand the EEPROM and PIC Communication.
I am new to PIC and EEPROM, after I read datasheet for 24LC32 and I have the following questions, I couldn't find answer from the datasheet.
Questions:
| Quote: | 1. How to use the A2, A1, A0
Let say if I use 3 of 24C32 device connect to the same I2C bus,
How do I config the A2-A0?
2. How to translate(mapping) from 4096 bytes to address 0x0000-0x0fff
and how to use the address ( example, how many word can I store in the
4096 bytes memory, and if I want to store the adc result (255 or 0xFF) to
the 4096 bytes memory, how do I store it and what is the starting
address? How much memory does the 255 use from the memory? How do
I know the next address to use if I want to store more data in to the
EEPROM. |
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