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I do not see where you have actually placed the LCD
component on the schematic from the catalog ?
Correction, I see it was way off schematic.
Also the pin assignment starts with the LSB in the port -
And make sure you have a contrast pot set to ~ 1/2 Vdd (Vcc) to start.
Regards, Dana.
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Here is an example project for Ardunio and it shows the wiring for the LCD. This Library component allows you to hook the LCD up to any port this is better than trying to find 4 pins togetter on one port. I think the RW pin is your issue however if you look at the LCD schematic it is grounded.
Bobgoar
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Also it is best not to use P2 for digital uses at this is the Analog ports for the SARMUX and on the Pioneer kit it is designed to be the analog ports and has the Analog shields and has less noise. I know that you can use any pin on most ports but it is best to follow the design specs for the PSOC device.
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Here is the kees LCD component you can add to your workspace that allows random
pin assignment. Note this does NOT override the dedicated pin limitations in PSOC 4.
http://www.cypress.com/?app=forum&id=2492&rID=75707
http://www.cypress.com/?rID=93401 AN86439 - PSoC® 4 - Using GPIO Pins
Regards, Dana.
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Review this document look at fig 16 it shows what ports should be used for best performance. http://www.cypress.com/?docID=50855. mixed signal board layout for best performance.
Bobgoar
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Dear Dana / Bobgoar,
Thanks for support.
I have modified my project as below and I am using PSOC4 Pioneer Kit in this project.
P0.0 - DB4 - LCD Pin 11
P0.1 - DB5 - LCD Pin 12
P0.2 - DB6 - LCD Pin 13
P0.3 - DB7 - LCD Pin 14
P0.4 - En - LCD Pin 6
P0.5 - RS - LCD Pin 4
P0.6 - R/W - Grounded
You can also check attached snapshot in zip file alongwith psoc creator 3.1 SP3 project file.
On hardware side i had checked all connections with multimeter which are correct.
I had given separate 7805 based supply to 16x2 LCD - with no common ground as well.
Also i not connected POTNETIONMETER on 3rd pin of LCD. Can i used any fixed resitors instead of potentiometer on this pin.
Thanks once again.
Have a good day.
Nainesh.
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Here is a picture of the program I sent you. You can see the bread board setup and the Arduino shield on the PSOC 4M. This also works on the Psoc Pioneer board.
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Also i not connected POTNETIONMETER on 3rd pin of LCD. Can i used any fixed resitors instead of potentiometer on this pin.
The problem with this is none (that I have seen) of the LCD datasheets have a
spec on the contrast voltage optimum V. Stated another way this is saying it varies
a lot LCD to LCD. What you can do is use IDAC and an R to convert to V and
feed that to LCD, coupled with user code to optimize the LCD contrast. That way
you get optimum contrast, best display appearance.
Keep in mind setting this properly may also affect viewing angles on some LCD
technologies.
Regards, Danba.
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I can not see your Psoc 4 pioneer board in the picture you enclosed in the file dump. But you have all your connections to port P0_0 -P0_7 on the PSOC 4 chip in your design.
These do not come out on the Arduion pins in a straight line. So here is the header list for Psoc to Arduino headers.
Psoc Arduio
J0_0 J2_13
J0_1 J2_15
J0_2 J2_2
J0_3 J2_4
J0_4 J4_1
J0_5 J4_2
P0_6 J3_6
P0_7 J4_03
Also you must tie the ground from your external regulator to the Psoc ground or the digital signals will not be correct . You could just change the 3.3v Jumper to 5 V operatiion and drive the LCD with the PSOC directly.
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Dear All,
Because of your support i am getting output on 16x2 LCD finally but having issue as attached in snapshot alongwith my project coding.
Thanks for support.
All characters are coming on single place only.
Do I have to shift digit of printing in C coding or API do that directly ?
Have a good day.
Nainesh.
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Yes, when you print to display first you should position cursor with
Most components have APIs, just right click, open datasheet.
Regards, Dana.
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Nain Since you are using an ADC in your project you should be using the Printf function to print the data to your LCD and your EEprom. Check this example http://www.element14.com/community/message/78621/l/psoc-4-pioneer-kit-community-project023-tinyprint.... It makes your data conversion easier. I did not see any characters on your LCD photo. Also it appears that your contrast is too high on your LCD and it is blanking out your characters.
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If you are going to use sprintf the attached will help with
formatting string.
Additionally if you are going to use floats you need to enable
library -
http://www.cypress.com/?id=4&rID=87354 nano library
http://www.jb.man.ac.uk/~slowe/cpp/itoa.html
Regards, Dana.