Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication. Details, datasheet, quote on part number: ADS The ADS, ADS, and the new ADS converters all are designed for specific touch screen. ADSE ti ADS, Touch Screen Controller. FEATURES. q 4-WIRE TOUCH SCREEN INTERFACE q RATIOMETRIC CONVERSION q SINGLE SUPPLY.
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ADS datasheet, Pinout ,application circuits 4-wire Touch Screen Controller
ADS Datasheet(PDF) – TI store
Thread starter Micro Start date Apr ads784, Micro New Member Apr 9, Hey guys, I could use a bit of help. I’m stuck trying to figure out this controller. I found some sample drivers in the GLCD and touch screen: I have tried to break it apart a bit and understand it: The first thing you should be doing is displaying the raw data Readx and Ready What I do is write the value’s to the screen dead center so I can see Then touch everywhere and write down the figures.
Calibration is a bit eatasheet. I found that the touch panel tilts slightly so linear calibration isn’t the best way to go. I calibrate the dead center then each quarter in turn This give the best results I have 4 calibrations 5 point calibration If your touch panel doesn’t tilt you can get away with 3 points One other thing when you press the touch wait mS before you read x and y, the ads may do this for you, as the reading settles and changes position.
Micro New Member Apr 10, Thanks for the response Ian I really appreciate it.
Ads78843 also be sure and wait ms before reading the values. I’ll try working on it a bit more later today, but your response raised a few questions more questions: From the example I am working off of, I’m a bit confused as to when I actually get the X and the Y data and how it works. I believe it is here: I have never used this touch controller I make my datahseet The touch sometimes comes like this So I use the middle and then go to all four corners making four different maps.
Oh wow, that’s cool. Do you use the uC’s builtin ADC to do this? Well, I’m stuck with this controller for now, heh.
Also, thank you for clearing up the A2-A0, looking back at the data sheet it makes a bit more sense. Ouch, I can see from the above picture how mechanically the touch screen can sometimes not be properly be placed acs7843 the LCD screen, thanks for clearing that up as well. My last question mainly deals with the calibration.
Once you get those coordinates what exactly do you do with them? Do I just add or subtract in this case the amount it is off by, and for areas close to the center use that offset and for the corners use their respective offsets? Or do I average the offsets of the center and corners and use that as the “overall” offset?
Even when it IS placed properly, this can happen. It can sometimes be a little crooked as well But to make the most of it I calibrate 4 parts instead of one This makes it a little more linear.
4-wire Touch Screen Controller
Sorry for the multitude of questions, but once you have the offsets for the middle and corners do you average the ads77843 offsets? In general what is the process used with the five offsets?
You need a map function to work out the TRUE pen position map xLeft, yTop, xcentre,ycentre ; return point 0,0 tomap xcentre,ycentre, xright, yTop ; return pointto ,0 map xLeft, yBottom, xcentre,ycentre ; return point 0, tomap xcentre,ycentre, xright, ybottom ; return pointtoThis will give a good linear reading.
If I’m not mistaken, how it works is read the X and Y and using if statements check to see if it falls into a certain range and then use one of the map functions that contains an offset for the corresponding range? For example, if I read infor the center when it is supposed to beI then check to see which map function I should use and if falls within a certain range I use the center offset that I have stored subtracts 40 and 30?