PIC18F I2C Communication with Arduino

[HenrikOlsson]

Dave,
I do design hardware from time to time but yeah, I'd love to do more. I tend to use SPI as I think it's both easier and faster and all the functions you mention are available in chips with SPI-interface as well as I2C so I've never actually had the need TO use it - that's it really.

Scampy,
I2C/Read/Write are not "hardware assisted" commands, they do not use the (M)SSP module in the PIC so any pins can be used.

picmilan,
I'll repeat what I said earlier: Check if the pins you're using has analog functions and make sure they're turned off.

/Henrik.

[picmilan]

picmilan,
I'll repeat what I said earlier: Check if the pins you're using has analog functions and make sure they're turned off.

/Henrik.

Yeah,You are right! Looking at datasheet those pins are analog by default..

Now Control Address and write address is what confuses me.Control Address is 0x26 as defined in arduino code,right? so what is write address?

Is SPI easier? I don't have many pins available but if I2C doesn't work I guess I don't have any other option.

[Scampy]

Henrik, I thought as much, which is why I added the comment about PBP using any pin. I was simply suggesting he tried other pins, and use those designated for such communications if the pic has them. Hopefully if the OP disables any analogue config his issue will be resolved

[richard]

try it like this
Arduino i2c address' are 7bit
pbp uses 8bit


ADDR = $26 ' 7bit Arduino I2C address
addr=addr<<1 ;shift to 8 bitformat



I2CWrite SDA,SCL,ADDR,[0]

[picmilan]

try it like this
Arduino i2c address' are 7bit
pbp uses 8bit


ADDR = $26 ' 7bit Arduino I2C address
addr=addr<<1 ;shift to 8 bitformat



I2CWrite SDA,SCL,ADDR,[0]

It worked! Thanks alot!