This article provides information on how to start working on the parallel resistive touch display, which includes how to set up the hardware (wiring) and install the necessary drivers for a touch demo.
Parallel RGB Display with resistive touch can be ordered along with any Apalis or Colibri module and carrier board.
All the products can be ordered online at Toradex Webshop
When connecting the display to any of our carrier boards, make sure that pin 1 of the display is connected to pin 1 of the board. Due to the nature of the FFC connectors, it is possible to invert the pinout and possibly damage the display and/or carrier board.
Also, be careful with the brown levers on the connectors. They are very delicate and can easily break.
Please have a look at the pictures below which show how to connect the display with our carrier boards & Evaluation boards:
Download the CAB installer according to the OS you are using:
Connect the display with the provided FFC cable to the Carrier Board or Evaluation Board paying attention to the pin numbering on the display and on the carrier board.
You can even set the proper resolution and timing parameters of RGB display through registry settings:
If you connect the display with our standard Carrier boards you may experience that the display does not show to maximum brightness. To get the maximum brightness you need to set the back-light PWM_A signal to output 0.
|Module||Signal Name||SODIMM Pin/MXM pin||GPIO Pin||Display Pin|
|Colibri T20||PWM_A||59||B4 Note1||6 (LEDCTRL)|
|Colibri T30||PWM_A||59||B4 Note1||6 (LEDCTRL)|
|Colibri VF50||PWM_A||59||PTC7||6 (LEDCTRL)|
|Colibri VF61||PWM_A||59||PTC7||6 (LEDCTRL)|
Note1: SODIMM pin 59 on Colibri T20 and T30 has two CPU signals assigned (multiplexed) L5 and B4. Make sure you set B4 to output 0 and L5 to input.
Whereas, for Apalis T30 on a standard Apalis carrier board use GPIO C.00.
|Module||Signal Name||MXM Pin||GPIO Pin||Display Pin|
|Apalis T30||BKL1_PWM||239||C.00||6 (LEDCTRL)|
For a test you can use the GPIOConfig Tool.
The parallel RGB display also features resistive touch screen interface on the same FFC.
To calibrate the touchscreen see: Touch Screen Calibration.
To make the calibration permanent, you need to save the registry.