LTDC Line event callback vs ltdc preload buffer.

HI

i try in callback repeat one memory line in two display lines, but display still show no doubled image.

Config is L8 CLUT framebuffer .

Code

 	LTDC_Layer2->CFBAR -= 320;
 	LTDC->SRCR = (uint32_t)LTDC_SRCR_IMR;
 	HAL_LTDC_ProgramLineEvent(hltdc, LTDC->LIPCR+2);

callback work every second line on visible area, but dont double. I mean because is preloaded in buffer. Exist way to go?

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