Kinetis MicrocontrollersのトピックRe: Resistive touch twr-lcd using k70

Resistive touch twr-lcd using k70

ankurchauhan — Tue, 24 Nov 2015 11:24:57 GMT

Hi,

I'm using k70 Tower kit with resistive touch twr-lcd module.

I'm using bare metal project.

Can anyone share some sample code for resistive touch twr-lcd(for k70).

Regards

Ankur

Re: Resistive touch twr-lcd using k70

ankurchauhan — Tue, 24 Nov 2015 11:27:50 GMT

I need to read the data from the screen whenever its get touch..

Re: Resistive touch twr-lcd using k70

mjbcswitzerland — Tue, 24 Nov 2015 12:47:39 GMT

See http://www.utasker.com/docs/uTasker/uTaskerTouch.PDF

Code for K70 and TWR-LCD is included in the uTasker project at http://www.utasker.com/forum/index.php?topic=1721.0

Search for SUPPORT_TOUCH_SCREEN in the code and the settings for K70F150M_12M.

Initialisation is fnStartTouch() in glcd_tft.h and the interrupt is handled in fnTouchInterrupt().

The touch operation is also simulated in the uTasker Kinetis simulator - as show in screen shot below:

Video of the operation: https://www.youtube.com/watch?v=PvsFFRigwFU (same operation on TWR-K70)

Regards

Mark

Kinetis: http://www.utasker.com/kinetis.html

K70: http://www.utasker.com/kinetis/TWR-K70F120M.html / http://www.utasker.com/kinetis/EMCRAFT_K70F120M.html

For the complete "out-of-the-box" Kinetis experience and faster time to market

Re: Resistive touch twr-lcd using k70

LuisCasado — Tue, 24 Nov 2015 13:43:18 GMT

Hello,

You can also check the eGUI code. It includes drivers for resistive touch screen and ADC.

https://github.com/Gargy007/eGUI/tree/master/D4D/low_level_drivers/touch_screen

This is the configyration for TWR-K70 using the TWR-LCD touch screen. Notice, you need hardware rework to connect resistive touch in TWR-LCD to TWR-K70.

#define D4DTCH_ADC_HW D4DTCH_ADC_HW_KINETIS

#define D4DTCH_ADC_ID 1 // Use ADC module 1

#define D4DTCH_MCU_USER_INIT {D4DTCH_X_PLUS_PCR = PORT_PCR_MUX(1) | PORT_PCR_DSE_MASK;\

D4DTCH_X_MINUS_PCR = PORT_PCR_MUX(1) | PORT_PCR_DSE_MASK;\

D4DTCH_Y_PLUS_PCR = PORT_PCR_MUX(1) | PORT_PCR_DSE_MASK;\

D4DTCH_Y_MINUS_PCR = PORT_PCR_MUX(1) | PORT_PCR_DSE_MASK;\

}

// X+ wire definition

#define D4DTCH_X_PLUS 17

#define D4DTCH_X_PLUS_PORT GPIOA_PDOR // Data output register

#define D4DTCH_X_PLUS_DDR GPIOA_PDDR // Output enable register

#define D4DTCH_X_PLUS_ADCH 17 // ADC channel number

#define D4DTCH_X_PLUS_PCR PORTA_PCR17

// X- wire definition

#define D4DTCH_X_MINUS 10

#define D4DTCH_X_MINUS_PORT GPIOB_PDOR

#define D4DTCH_X_MINUS_DDR GPIOB_PDDR

#define D4DTCH_X_MINUS_PCR PORTB_PCR10

// Y+ wire definition

#define D4DTCH_Y_PLUS 6

#define D4DTCH_Y_PLUS_PORT GPIOB_PDOR

#define D4DTCH_Y_PLUS_DDR GPIOB_PDDR

#define D4DTCH_Y_PLUS_ADCH 12

#define D4DTCH_Y_PLUS_PCR PORTB_PCR6

//#define D4DTCH_INIT_Y_PLUS OUTPUT(D4DTCH_Y_PLUS); RESET(D4DTCH_Y_PLUS);

//#define D4DTCH_RESET_Y_PLUS RESET(D4DTCH_Y_PLUS);

//#define D4DTCH_SET_Y_PLUS SET(D4DTCH_Y_PLUS);

// Y- wire definition

#define D4DTCH_Y_MINUS 5

#define D4DTCH_Y_MINUS_PORT GPIOB_PDOR

#define D4DTCH_Y_MINUS_DDR GPIOB_PDDR

#define D4DTCH_Y_MINUS_PCR PORTB_PCR5

//#define D4DTCH_CALIB_CROSS_OFFSET 30

// Constant specifying maximum ADC value for a screen touch (=12bits)

#define D4DTCH_FULL_SCALE 0x0FFF

// Constants specifying minimum ADC value for a screen touch

#define D4DTCH_X_TOUCH_MIN (D4DTCH_FULL_SCALE / 10)

#define D4DTCH_Y_TOUCH_MIN (D4DTCH_FULL_SCALE / 10)

#define D4DTCH_X_TOUCH_OFFMAX (D4DTCH_X_TOUCH_MIN * 3)

#define D4DTCH_Y_TOUCH_OFFMAX (D4DTCH_Y_TOUCH_MIN * 3)

// Constants specifying ADC difference for touch screen sample

//#define D4DTCH_SAMPLE_MARGIN (D4DTCH_FULL_SCALE / 256)

Re: Resistive touch twr-lcd using k70

ankurchauhan — Thu, 26 Nov 2015 05:45:33 GMT

Hi Luis,

Thanks for reply.

This D4D project is expecting "mqx.h" file.

But I'm not using MQX ,my project is bare board project(using codewarrior 10.6.4).

Should I download MQX and integrate it with CW or without MQX it's possible to configure and use "touch twr-lcd"??

if I have need MQX then which version of it??

Regards

Ankur

Re: Resistive touch twr-lcd using k70

LuisCasado — Thu, 26 Nov 2015 11:08:31 GMT

Hi Ankur,

eGUI (D4D) can work also in bare metal. Notice that TWR-K70 is used together with TWR-LCD-RGB. In this case, touch is controlled by CRTOUCH device populated in the TWR-LCD-RGB. So, all the examples you will find are based on TWR-K70 + TWR-LCD-RGB (using LCDC K70 module and CRTOUCH). http://www.freescale.com/products/sensors/touch-sensors/freescale-touch-sensing-platform-a-ready-play-solution:CRTOUCH

But the configuration I gave you is coming from old demo using TWR-K70 + TWR-LCD where LCD was controlled by K70 Flexbus and touch using K70 ADC channels. But hardware rework was required because the TWR-K70 ADC channels connected to TWR-LCD doesn't have GPIO capability, as you know, that is needed for implementing a touch sensing with ADC/GPIO.

Luis

Re: Resistive touch twr-lcd using k70

nikhilullal — Wed, 16 Mar 2016 14:37:57 GMT

Dear Luis,

Can you please explain what hardware rework is required for the TWR-LCD?

With Regards,

Nikhil Ullal