Help to configure PXP

[glory_man_by]

I use mxrt-1062-based board. Application based on zephyr-rtos, also LVGL library used to create GUI.

My device has 1024 x 768 LCD-module placed in portrait mode so that (0;0) is at the bottom. So LVGL configured as 768 x 1024, and to get the elcdif-buffer I should rotate data from image-buffer 270 degrees.

I tried to use PXP with following configuration

const pxp_ps_buffer_config_t psBufferConfig = {
  .pixelFormat = kPXP_PsPixelFormatRGB565,
  .swapByte = false,
  .bufferAddr = (uint32_t)pxp_buf,
  .bufferAddrU = 0U,
  .bufferAddrV = 0U,
  .pitchBytes = ELCDIF_PANEL_RGB_HEIGHT * 2,
};

PXP_SetProcessSurfaceBackGroundColor(PXP, 0x000000U);
PXP_SetProcessSurfaceBufferConfig(PXP, &psBufferConfig);
PXP_SetProcessSurfacePosition(  PXP,  0,
                                      0,
                                      ELCDIF_PANEL_RGB_WIDTH - 1,
                                      ELCDIF_PANEL_RGB_HEIGHT - 1);
static pxp_output_buffer_config_t outputBufferConfig;

outputBufferConfig.pixelFormat = kPXP_OutputPixelFormatRGB565;
outputBufferConfig.interlacedMode = kPXP_OutputProgressive;
outputBufferConfig.buffer0Addr = (uint32_t)data->fb[write_idx].data;
outputBufferConfig.buffer1Addr = 0U;
outputBufferConfig.pitchBytes = ELCDIF_PANEL_RGB_WIDTH* 2;
outputBufferConfig.width = ELCDIF_PANEL_RGB_WIDTH;
outputBufferConfig.height = ELCDIF_PANEL_RGB_HEIGHT;
PXP_SetOutputBufferConfig(PXP, &outputBufferConfig);
PXP_EnableCsc1(PXP, false);

PXP_SetRotateConfig(PXP, kPXP_RotateProcessSurface, kPXP_Rotate270, kPXP_FlipDisable);
PXP_Start(PXP);
while (!(kPXP_CompleteFlag & PXP_GetStatusFlags(PXP))) {
}

PXP_ClearStatusFlags(PXP, kPXP_CompleteFlag);

ELCDIF_SetNextBufferAddr(config->base, uint32_t) data->fb[write_idx].data);

where: pxp_buf is lvgl-image buffer 768 x 1024, data->fb[write_idx].data - is buffer for elcdif (before new itteration contains the previous itteration data).

This code works but when I change image (full or partially) I see artifacts on the screen (some pixels, lines).

This is frist screen

after switch to second screen I see pixel lines at the bottom of the screen which should not be.

 If I switch back to first screen

I also see pixel lines at the bottom.

It seems like data after rotation partially mixes in this zone with previous image data which were in output buffer before rotaiton.

I can't understand where I made a mistake. 

[jeremyzhou]

Hi,
Thank you for your interest in NXP Semiconductor products and for the opportunity to serve you.
Adding the code line :

/* Disable AS. */
    PXP_SetAlphaSurfacePosition(DEMO_PXP, 0xFFFFU, 0xFFFFU, 0U, 0U);

after the function code :

PXP_SetProcessSurfacePosition( PXP, 0,
0,
ELCDIF_PANEL_RGB_WIDTH - 1,
ELCDIF_PANEL_RGB_HEIGHT - 1);

Then, give it a try again.
Hope it helps.
Have a great day.
TIC

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[glory_man_by]

Is it possible that PXP mixes rotated image from PS buffer with the image already in the buffer ?