TOUCH SENSING SOFTWARE


What is Touch Sensing Software and what is the difference between Pk40 and MK40( associated with tsi)?

Freescale provides a library called Touch Sensing Software(TSS). The TSS solution transforms a typical Freescale microcontroller into an area capacitive touch sensor controller. The touch sensor controller comes with an ability to manage multiple touch pad configurations and mechanical keys while maintaining its standard MCU handle function.

The library provides commonly used touch sense decoding structures for example a keypad, a rotary, a slider, a good analog slider, an analog rotary, and also a matrix. The latest version freescale released is TSS_3_1_0.

To create the project :
1. Firstly copy the binary library through the TSS that is suitable for you.
2. In the example folder there are various example projects for different processors. Copy the project for your processor.
So here i'll tell you about K40 board. It comes with an inbuilt touch interface.
And you possibly can copy KWIKSTIK_DEMO from example.

One thing to be careful aout is this: the processor will have different versions, i.e. the KWIKSTIK board has PK40X256VLQ100 where P denotes the prototype version; there is also a processor called MK40X256VLQ100 where M denotes manufactured version.
There are some differences between the these two versions.
  1. In PK40 there are 16 electrodes and for each electrode there will be a threshold registers but in MK40 there is only one threshold register for all the electrodes.
  2. The driver software provides by freescale is for PK40 so some of the macros present in driver software will not be present in the header file of MK40. For example, in mcg.c you will get some compilation error so in that case you need to select the default clock value 21 MHz.
  3. The header file generated in codewarrior for PK40 processor is MK40DZ10.h where as for MK40 it is MK40D10.h . 'Z' denotes the initial revision of silicon chip.
So while selecting the processor extreme care needs to be exercised. An alphabet can make all the difference.
                                                                                                             Shabana M
                                                                      

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