TouchGFX gray 4 to RGB565

[KRega.1]

I'm using TouchGfx in Gray 4 mode. I have read the GFX documentation and I can't find the answer. I can't figure out how the data is stored in RAM. Consequently, I need to convert this Gray 4 to RGB565 to my FMC 16bit 8080 TFT-LCD. Any ideas how to do this? or additional references I should be reading? I'm using a 480 x 854 LCD.

Here is a failed attempt..

void TouchGFXHAL::copyFrameBufferBlockToLCD(const Rect rect)
{
    __IO uint16_t* ptr;
    int16_t row;
 
    // For Gray4 only 4 bits per pixel
    for (row = 0; row < (rect.width) ; row++)
    {
        ptr = getClientFrameBuffer() + rect.y + (row+ rect.x)  * 120;    // 480 x 854 LCD
        LCD_IO_WriteMultipleDataGrey4((uint16_t*)ptr, 120);
    }   
}
 
 
  void LCD_IO_WriteMultipleDataGrey4(uint16_t* pData, uint32_t Size)
    {
        uint32_t  i;
 
        for (i = 0; i < Size; i++)
        { //			R 5bits					G 6bits                    B 5 bits
           FMC_BANK1_WriteData( ((pData[i]&0xF000)<<0) | ((pData[i]&0xF000)>>5) | ((pData[i]&0xF000)>>12) );
 
           FMC_BANK1_WriteData( ((pData[i]&0x0F00)<<4) | ((pData[i]&0x0F00)>>0) | ((pData[i]&0x0F00)>>8) );
 
           FMC_BANK1_WriteData( ((pData[i]&0x00F0)<<8) | ((pData[i]&0x00F0)<<5) | ((pData[i]&0x00F0)>>4) );
 
           FMC_BANK1_WriteData( ((pData[i]&0x000F)<<12) | ((pData[i]&0x000F)<<10) | ((pData[i]&0x000F)>>0) );
        }
    }

[MM..1]

Your shifting nums >> << isnt right, check 😁

[KRega.1]

        for (i = 0; i < Size; i++)
        { //							R 5bits					G 6bits                    B 5 bits
           FMC_BANK1_WriteData( ((pData[i]&0xF000)<<0) | ((pData[i]&0xF000)>>5) | ((pData[i]&0xF000)>>11) );
 
           FMC_BANK1_WriteData( ((pData[i]&0x0F00)<<4) | ((pData[i]&0x0F00)>>1) | ((pData[i]&0x0F00)>>7) );
 
           FMC_BANK1_WriteData( ((pData[i]&0x00F0)<<8) | ((pData[i]&0x00F0)<<3) | ((pData[i]&0x00F0)>>3) );
 
           FMC_BANK1_WriteData( ((pData[i]&0x000F)<<12) | ((pData[i]&0x000F)<<7) | ((pData[i]&0x000F)<<1) );
           
        }

ok this is correct now, right?

Thanks, Kevin

[MM..1]

Seems right now, and too exist second choice use DMA2D L4 CLUT conversion for offload MCU. This enable choice some colors not only gray...