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| − | [[category: ARM Tutorials]] | + | #REDIRECT [[LPC1768: GLCD Interfacing]] |
| − | [[User:Amruta|Amruta]] ([[User talk:Amruta|talk]]) 13:21, 17 March 2015 (IST)
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| − | ----
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| − | =Basics=
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| − | If you have done with simple 16x2 LCD and still want to do more with display, its time to have fun with Graphics LCD.
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| − | We all really enjoy animations kind of things and this is the stuff what we can do with GLCD.
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| − | GLCD is very similar to simple 16x2 LCD with additional features. To explore these features and functionality you would like to see our tutorial [[Graphics LCD Basics : KS0108 based JHD12864E]]
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| − | =Schematic=
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| − | [[File:Schematic LPC1768 GLCD.svg|x500px|center|Schematic]]
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| − | =Port Connection=
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| − | This section shows how to configure the GPIO for interfacing the GLCD.<br>
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| − | The below configuration is as per the above schematic. You can connect the GLCD to any of the PORT pins available on your boards and update this section accordingly
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| − | <html>
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| − | <script src="https://gist.github.com/Amritach/e4fa5e69f7b9aea3b785.js"></script>
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| − | </html>
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| − | =GLCD Operation=
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| − | In this section we are going to see how to send the data/cmd to the GLCD along with the timing diagrams.
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| − | First lets see the timing diagram for sending the data and the command signals(RS,RW,EN), accordingly we write the algorithm and finally the code.
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| − | ===Timing Diagram===
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| − | The below image shows the timing diagram for sending the data to the LCD.<br>
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| − | As shown in the timing diagram the data is written after sending the RS and RW signals. It is still ok to send the data before these signals.<br>
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| − | The only important thing is the data should be available on the databus before generating the High-to-Low pulse on EN pin.
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| − | [[File:LCD CmdWrite.jpg|figure: command write]]
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| − | <br><br>
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| − | ===Steps for Sending Command:===
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| − | *step1: Send the I/P command to GLCD.
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| − | *step2: Select the Control Register by making RS low.
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| − | *step3: Select Write operation making RW low.
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| − | *step4: Send a High-to-Low pulse on Enable PIN with some delay_us.
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| − | <html>
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| − | <script src="https://gist.github.com/Amritach/9805fb05ece462313c7b.js"></script>
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| − | </html>
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| − | ===Steps for Sending Data:===
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| − | *step1: Send the character to GLCD.
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| − | *step2: Select the Data Register by making RS high.
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| − | *step3: Select Write operation making RW low.
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| − | *step4: Send a High-to-Low pulse on Enable PIN with some delay_us.
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| − | The timings are similar as above only change is that '''RS''' is made high for selecting Data register.
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| − | <html>
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| − | <script src="https://gist.github.com/Amritach/1b0a36c5c5b0649f4c37.js"></script>
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| − | </html>
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| − | =Code=
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| − | =Code Example=
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| − | ===Example 1===
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| − | Let's start with displaying some text.
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| − | <html>
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| − | <script src="https://gist.github.com/Amritach/5eac6fa30a8829def2b4.js"></script>
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| − | </html>
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| − | ===Using Explore Embedded Libraries :===
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| − | In the above example we just discussed how to interface Graphics Lcd.<br>
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| − | Once you know the working of GLCD, you can directly use the ExploreEmbedded libraries to play around with your GLCD.<br>
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| − | For that you need to include the glcd.c/glcd.h and the associated files(delay/stdutils).<br>
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| − | After including these files, the only thing you got to do is to configure the PORTs in glcd.h as per your hardware connection.<br>
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| − | The below sample code shows how to use the already available GLCD functions.<br>
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| − | Refer this link for more info on GLCD libraries.
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| − | <html>
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| − | <script src="https://gist.github.com/Amritach/d383ab80738c7177ad79.js"></script>
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| − | </html>
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| − | Lots of things are there which you would like to do with GLCD and we will cover it in the future tutorials. For now, you don't forget to comment.
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| − | {{DISQUS}}
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