LabVIEW Interface for Arduino Discussions
Adjusting color and brightness of 2.8" TFT LCD color touch screen - SOLVED!
Well done Daniel!. It's all simple once you know how. 
Now you are this step you will next need to modify the LVIFA file set to include your new LCD functions.
If you look in your LVIFA_Base directory (e.g. C:\Program Files (x86)\National Instruments\LabVIEW 2010\vi.lib\LabVIEW Interface for Arduino\Firmware\LVIFA_Base)
There is the main LVIFA_Base.ino sketch which polls Labview via the serial port to see what to do next. The request from Labview is then passed to a "switch" statement in LabVIEWInterface.ino.
You will need to firstly add a new 'case' for your LCD functions and then add the case enumeration to the .vi you are using.... for example in my application I have added the following which calls my custom function. Your vi may also need to send parameters such as colour etc
case 0x41: // Get Current Sense
retVal = getIsense(0); // Relay card CS, relay to toggle, R/W
Serial.write( (retVal >> 8));
Serial.write( (retVal & 0xFF));
break;
Takle a good look at this post it walks you through adding your custom device...
https://decibel.ni.com/content/message/23934#23934
Let me know how you go!
Regards,
Dale
Hi Dale,
I have been doing other things in the meantime and got a bit more experienced in using Arduino with LabView, but the TFT issue is still unsolved.
I had a good look at https://decibel.ni.com/content/message/23934#23934 and I tried many ways in getting a function executed by sending a case, but - unfortunately no success at all 😞
I modified both LVIFA_Base.pde and LabviewInterface.h by adding
#include <TFT_Graphics.h> (btw, what is the difference between using "" or <>?, When I look at the color in the sketch, it is yellow for the standard includes and black for my added TFT_Graphics file. Is is important that TFT_Graphics is shown in yellow color?)
In the LabviewInterface.h code I added this case:
case 0x41:
initialize(LCD_HORIZONTAL);
ClearScreen(BLACK);
break;
As well as the functions (stolen an modified from the Graphics.cpp file):
void initialize(uint8_t orient)
{
LCD::SetOrientation(orient);
LCD::SetColor(WHITE);
LCD::init();
}
void ClearScreen(uint16_t color)
{
LCD::resetArea();
LCD::fill(LCD::GetWidth()-1, LCD::GetHeight()-1, color);
}
When I create a sketch like this and run it independently from LVIFA the code works fine:
#include <TFT_Graphics.h>
Graphics tft;
void setup()
{
tft.initialize(LCD_HORIZONTAL);
tft.ClearScreen(WHITE);
//tft.FastSolidRect(85, 10, 240, 231, BLACK);
//tft.DrawCircle(160,120, 100, BLUE, 1);
}
void loop()
{
tft.ClearScreen(BLACK);
tft.FastSolidRect(85, 10, 240, 231, BLUE);
delay(1000);
tft.ClearScreen(BLUE);
tft.FastSolidRect(85, 10, 240, 231, BLACK);
delay(1000);
}
Same for this code:
#include "TFT_Graphics.h"
void setup() // run once, when the sketch starts
{
}
void loop() // run over and over again
{
initialize(LCD_HORIZONTAL);
ClearScreen(BLACK);
}
void initialize(uint8_t orient)
{
LCD::SetOrientation(orient);
LCD::SetColor(WHITE);
LCD::init();
}
void ClearScreen(uint16_t color){
LCD::resetArea();
LCD::fill(LCD::GetWidth()-1, LCD::GetHeight()-1, color);
}
But I can't get this running with LVIFA by sending a case 0x41 using a VI like this:
Any suggestion is very very much appreciated as I'm kind of stuck here. Thanks heaps in advance!
