Kinetis MicrocontrollersのトピックRe: Printf in LCD 4x20

Printf in LCD 4x20

ivanrobles — Mon, 02 Dec 2013 16:44:57 GMT

Hi,

I'm using a LCD 4x20, Is there a way to use the function printf in my LCD?

What should I do? or What do I need to modify?

Re: Printf in LCD 4x20

Paul_Tian — Tue, 03 Dec 2013 01:04:37 GMT

Hi, Ivan

What is your LCD interface? Is it UART? If not, I am afraid that you cannot use function printf in your project.

Best Regards

Paul

Re: Printf in LCD 4x20

egoodii — Tue, 03 Dec 2013 01:12:39 GMT

The IAR-toolchain built-in printf function funnels thru a 'write' byte-output function, so if you can make a driver that takes that ASCII and creates the proper display and functions on your display, then off you go.

Re: Printf in LCD 4x20

Amit_Kumar1 — Tue, 03 Dec 2013 12:03:01 GMT

Hi Ivan,

Please check this link Character LCD with 4 Lines | MCU on Eclipse

I am using this for 4X20 LCD and it is working fine for me. One modification in hardware is required, as in my case LCD required 5V supply but the Kinetis works on 3.3V so for interfacing This LCD I had to use a voltage level shifter in between. The rest you can see on the tutorial. If you are using Processor expert, there is a PE component for that i.e LCDHTA.

Best Regards

Amit Kumar

Re: Printf in LCD 4x20

ndavies — Tue, 03 Dec 2013 14:59:10 GMT

Another solution is to use asprintf or sprintf to format and place the output into a character string buffer. You can then send the buffer to the LCD.

Re: Printf in LCD 4x20

ivanrobles — Tue, 10 Dec 2013 17:11:18 GMT

Yes, I used sprintf and it was the solution.