Communicating with an LCD

[Guest]

My pic does not allow I2C or SPI communication, and it doesn't list anything else for communication either. What kind of LCD can I use with a pic that has no communication features? Does CCS allow me to use software based I2C communication?

[dyeatman]

What model of PIC do you have that has no comms hardware at all?
_________________
Google and Forum Search are some of your best tools!!!!

[Rohit de Sa]

[Guest]

it's a pretty common mcu, 16f684.

I tried using software i2c but I can't get it to display anything. When I use the following code, it says the identifiers are unidentified.

#use i2c(slave,sda=pin_c3,scl=pin_c4)

? it's something like that, but I don't have it in front of me. Then later in my code I use:

void i2cstart()
{
scl=1;
sda=1;
sda=0;
scl=1;
}

Do I need to add:

int1 sda;
int1 scl;

???

[PCM programmer]

[Rohit de Sa]

What sort of LCD do you have? A simple character LCD? Some character LCDs have a serial 'backpack' on them. This allows them to communicate using I2C, async-serial, SPI, and other serial protocols.

In case your LCD is a plain-jane character LCD, use PCM's link to get it to work.

Rohit