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PIC 16f877a EEPROM Accessing

 
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gopi



Joined: 23 May 2015
Posts: 4
Location: chennai

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PIC 16f877a EEPROM Accessing
PostPosted: Sat May 23, 2015 7:17 am     Reply with quote
Good morning..

I have PIC 16f877a. Now i write the value 300 in this pic EEPROM
I am using following Syntax its only store the value 0 to 255.
so Pls Guid to store the value of 300 in this pic eeprom.

write_eeprom (0x00,300);
i=read_eeprom (0x00);


pls send the syntax
jeremiah



Joined: 20 Jul 2010
Posts: 1358

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PostPosted: Sat May 23, 2015 7:42 am     Reply with quote
300 is not an int8 value (0-255 are int8 values).

You either need to use an int16 value and split it/merge it:

Code:

unsigned int16 value = 300;
unsigned int16 result = 0;

write_eeprom(0x00,make8(value,1));
write_eeprom(0x01,make8(value,0));

result = make16(read_eeprom(0x00),
                read_eeprom(0x01));



or if the compiler has pointer/length write_eeprom and read_eeprom support for your chip:

Code:

unsigned int16 value = 300;
unsigned int16 result = 0;

write_eeprom(0x00,&value,sizeof(unsigned int16));
read_eeprom(0x00,&result,sizeof(unsigned int16));
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