Frame buffers

Hi,

The L4R9AI-EVAL has a display with GRAM, so only one TouchGFX framebuffer is necessary. Partial framebuffers is for low cost solution MCUs like G0 that have little internal memory and when the project does not wish to rely on external SDRAM to fit a full framebuffer.

Yes, you can access the framebuffer and do anything you want to the content there. Use

HAL::getInstance()->lockFrameBuffer();

Signature:

/**
 * @fn virtual uint16_t* HAL::lockFrameBuffer();
 *
 * @brief Waits for the frame buffer to become available for use.
 *
 * Waits for the frame buffer to become available for use (i.e. not used by DMA
 * transfers).
 *
 * @note Function blocks until frame buffer is available. Client code MUST call
 * unlockFrameBuffer() when frame buffer operation has completed.
 *
 * @return A pointer to the beginning of the currently used frame buffer.
 */
 virtual uint16_t* lockFrameBuffer();

Yes, TouchGFX supports vertical swipe.

/**
 * @typedef enum GestureType
 *
 * @brief The gesture event types.
 */
 typedef enum
 {
 SWIPE_HORIZONTAL, ///< An enum constant representing a horizontal swipe
 SWIPE_VERTICAL ///< An enum constant representing a vertical swipe
 } GestureType;

If you override the following method in your view, you'll get an event for either horizontal or vertical swipe:

/**
 * @fn virtual void Drawable::handleGestureEvent(const GestureEvent& evt)
 *
 * @brief Defines the event handler interface for GestureEvents.
 *
 * Defines the event handler interface for GestureEvents. The default implementation
 * ignores the event. The event is only received if the drawable is touchable.
 *
 * @param evt The GestureEvent received from the HAL.
 */
 virtual void handleGestureEvent(const GestureEvent& evt) { }

/Martin

1.one more thing you said to use lockframebuffer() function and can you tell me in which program file i can use that...

and what will happens if we write that instruction....

thank you ...

hello Martin....

i want do scrolling but in a arc manner...not vertically means vertically only but some with arc(angle)

thank you

like....in the image

Hi prathima, what you wish to do in that image is what is done in Tutorial 4 using a scrollWheel and modifying its Y value. You can compare the result and see the code here. Hope this helps,

/Romain

yeah,,,but is this location y location

y=y + getheight ( )/2-390/2;

your talking about romain Dieleman

I meant X value my bad. But just do the same code as in the tutorial and you will get this nice arc.

yes ..i got it:) thank you so much...

And what about the vertical swipe... Suppose i have a swipe container which is having 3 screen in between i want do horizontal swipe...

lets say....

screen1:analog clock

screen2:digital clock

Screen3:one imge

and these screens are side by side same way i have two more screen

one is upside(animation screen) of analog screen and one more is down side analog screen...

so my requirement is i want to do horizontal swipe i will get digital screen ..but in the case vertical swipe i can get animation screen(upside)

and same way down side screen....

how do i do the entire things..

thank you so much

and i asked about the frame buffer implementation...in above can you please look at it once and provide the solution for that,,,

thank you so much

Hello...

In L4R9AI-EVAL ,i want to access the frame buffer and i want to access the touch from there ,can i do that,if yes how do i do that...is there any example code....

thank you