Need I2C examples

[falleaf]

Anyone have a I2C slave code, and master code pls send to me

falleaf@hotpop.com

Thanks indeed.

[William H. Conley III]

Good Luck....................

[falleaf]

Receive nothing! ??

pls try with doanhiep@swissinfo.org

thanks muchie

[Haplo]

You can also try looking at the driver files in the \drivers directory as many of them use I2C.

[Guest]

Browse the forum

[falleaf]

You don't understand my requirement that

1) I know the examples in CCS C. However, it's very simple, and I'm new in C. I would like to have full examples of slave and master so that I may understand more clearly about how CCS C work. Because I used to use MPASM.

2) I don't want to browse the forum, because the forum posted some wrong codes and needed to fix. I would like the good examples that someone of you did. Anything, any purposes. I can understand C, and used MPASM, but I would like to understand C for PIC MORE CLEARLY.

3) Thanks indeed for your help. This is my seriosly urgent project, and I need further help. Thanks again for all.

[Radix]

Can you tell us more about the project you are working on?

Regards

[falleaf]

Oh, I only would like to send 8 byte from master to slave, and read the slave buffer of 8 byte. And I need an example code.

I may read I2C in ASM, but I'm learning CCS C. Therefore, an example will help meeh muchie.

The master will send 8 byte to slave when I press a button, and the slave save it to given memories. Each 10ms, the master will read 8 other bytes (other given memory) from the slave.

It's oki in ASM for me, but I don't know anything about C for PIC. That is my problem.

I read some function of CCS C, but I cannot imagine how it work. And if you have an example, pls send it to meeh asap.

Thanks indeed for all.

[Neutone]

If you have been using ASM you should be able to quickly read the listing file generated with those basic I2C examples that are included with the compiler. The listing shows the assembly instruction associated with each line of code written in C. This is helpfull when your unsure if your syntax is correct. Coming from assembly this should help you a lot.

[jds-pic]

[falleaf]

[falleaf]

You all seem to lost me. Everything I need is that would you send me whatever you did with I2C to communicate 2 PICs.

The manual is similar to the Help files, nothing different. And I have all the examples in CCS C standard. But the example of slave I2C only is not enough for me.

Compile to ASM and read the code is wier !!! I cannot do it, because they write in direct addresses code. I need to read some C code, I may help me to understand clearly.

So, pls send me if you have, or give me the direct link.

I helped many people to repair their codes in ASM, and I think no problems if I ask for an example code in C? There are many library in ASM but it's difficult for me to find the C libraries.

Thanks muchies.

[falleaf]

You all seem to lost me. Everything I need is that would you send me whatever you did with I2C to communicate 2 PICs.

The manual is similar to the Help files, nothing different. And I have all the examples in CCS C standard. But the example of slave I2C only is not enough for me.

Compile to ASM and read the code is wier !!! I cannot do it, because they write in direct addresses code. I need to read some C code, I may help me to understand clearly.

So, pls send me if you have, or give me the direct link.

I helped many people to repair their codes in ASM, and I think no problems if I ask for an example code in C? There are many library in ASM but it's difficult for me to find the C libraries.

Thanks muchies.

[CHRIS]

I wrote this code for write and read in a extern EEPROM by I2C.
I hope that it serves to you.



#define EEPROM_SCL PIN_C3
#define EEPROM_SDA PIN_C4
#define EEPROM_SIZE 32768 // 256kb = 32 Kb * 8
#define eeprom_address 0xa0 // 0xa0 => A1=0, A0=0 //se le suma 1 cuando para lectura

#use delay(clock=20000000)
#use i2c(Master,Fast,sda=EEPROM_SDA,scl=EEPROM_SCL)


void init_ext_eeprom() {
output_float(eeprom_scl);
output_float(eeprom_sda);
}


void write_ext_eeprom(long addr,byte data) {

i2c_start();
i2c_write(eeprom_address); //bits de la direccion de dispositivo : 1 0 1 0 0 A1 A0 R/W
i2c_write(addr); //OJO!!! R/W => R=1, W=0
i2c_write(addr>>8); //parte alta de addr
i2c_write(data);
i2c_stop();
delay_ms(11);
}


byte read_ext_eeprom(long addr) {
byte data;

i2c_start();
i2c_write(eeprom_address); //bits de la direccion de dispositivo : 1 0 1 0 0 A1 A0 R/W
i2c_write(addr); //OJO!!! R/W => R=1, W=0
i2c_write(addr>>8); //parte alta de addr
i2c_start();
i2c_write(eeprom_address+1); //bits de la direccion de dispositivo : 1 0 1 0 0 A1 A0 R/W
data=i2c_read(0); //El argumento indica que no requiere ACK
i2c_stop();
return(data);
}

[jds-pic]

[quote="falleaf"]