K70 LCDC wrapping the graphic window

slawoj — Thu, 26 Nov 2015 13:15:21 GMT

Hello everybody,

I've tried to use graphic window in the LCD controller built in the K70, but I have some troubles.

Screen in the graphic window is shifted by 1px (horizontally) and the last pixel of each line wrap around GW and appears at the start of the line.

Picture explains what I mean:

This problem doesn't depend on the size and position of the GW. It is not possible to eliminate it by address offset.

I use 800x480 24BPP display, but I've tested at 480x272 24 BPP display - same problem.

Here is my initialization of the LCDC, near standard code from Freescale examples:

void lcdc_init_screen()

{

int * pointer32;

int i;

LCDC_MemMapPtr lcd;

//Enable BL

lwgpio_init(&lcd_backlight, LCD_BACKLIGHT, LWGPIO_DIR_OUTPUT, LWGPIO_VALUE_NOCHANGE);

lwgpio_set_functionality(&lcd_backlight, LWGPIO_MUX_A11_GPIO);

lwgpio_set_value(&lcd_backlight, LWGPIO_VALUE_HIGH);

//Reset LCD

lwgpio_init(&lcd_reset, LCD_RESET, LWGPIO_DIR_OUTPUT, LWGPIO_VALUE_NOCHANGE);

lwgpio_set_functionality(&lcd_reset, LWGPIO_MUX_B16_GPIO);

/* Attempt reset */

lwgpio_set_value(&lcd_reset, LWGPIO_VALUE_LOW);

_time_delay_ticks (10);

/* Disable reset */

lwgpio_set_value(&lcd_reset, LWGPIO_VALUE_HIGH);

lcd = (LCDC_MemMapPtr) LCDC_BASE_PTR;

// set LCD Screen Start Address

lcd->LSSAR = FRAME_ADDR(0);

// set LCD Size. The XMAX bitfield is the screen x-size/16.

lcd->LSR = LCDC_LSR_XMAX( (SCREEN_XSIZE / 16) ) | LCDC_LSR_YMAX( SCREEN_YSIZE );

// set LCD virtual page width

lcd->LVPWR = LCDC_LVPWR_VPW (PAGE_XSIZE);

// set LCD cursor positon & settings (turn off)

lcd->LCPR = 0;

lcd->LCWHB = 0;

// set LCD panel configuration. Use endianess to work with TWR-LCD-RGB lines.

lcd->LPCR =

LCDC_LPCR_TFT_MASK | //TFT Screen

LCDC_LPCR_COLOR_MASK | //Color

LCDC_LPCR_BPIX(0x7) | //24 bpp

LCDC_LPCR_CLKPOL_MASK | //falling edge

LCDC_LPCR_FLMPOL_MASK | //first line marker active low

LCDC_LPCR_LPPOL_MASK | //line pulse active low

LCDC_LPCR_END_SEL_MASK | //Use big-endian mode (0xFFAA5500 means R=AA,G=55,B=00).

LCDC_LPCR_SWAP_SEL_MASK | //Set so that the LCD data lines match up correctly with the TWR-LCD-RGB

LCDC_LPCR_SCLKIDLE_MASK | //Enalbe LSCLK when vsync is idle

LCDC_LPCR_SCLKSEL_MASK | //Always enable clock

LCDC_LPCR_PCD(0x4); //Divide 150MHz PLL0 clock (default clock) by (4+1)=5 to get 30MHz clock

// set LCD horizontal configuration based on panel data (Figure 3-3 in Seiko datasheet)

lcd->LHCR =

LCDC_LHCR_H_WIDTH(19) | //(19+1)=20 SCLK period for HSYNC activated

LCDC_LHCR_H_WAIT_1(15) | //(15+1)=16 SCLK period between end of OE and beginning of HSYNC

LCDC_LHCR_H_WAIT_2(23); //(23+3)=26 SCLK periods between end of HSYNC and beginning of OE

// set LCD vertical configuration based on panel data (Figure 3-3 in Seiko datasheet)

lcd->LVCR =

LCDC_LVCR_V_WIDTH(10) | //15 SCLK period for VSYNC activated

LCDC_LVCR_V_WAIT_1(7) | //22 SCLK period between end of OE and beginning of VSYNC

LCDC_LVCR_V_WAIT_2(13); //15 SCLK periods between end of VSYNC and beginning of OE

// set the LCD panning offset (not used in 24bpp mode)

lcd->LPOR = 0;

// set LCD interrupt configuration register (interrupt on loading last data of frame from memory)

lcd->LICR = 0;

//Enable end of frame interrupts LCDC interrupts

lcd->LIER =

LCDC_LIER_EOF_EN_MASK;

//LCDC_LIER_GW_EOF_EN_MASK;

//Disable the graphic window. See the "color" and "fsl" demos for examples of

// using the graphic window feature

lcd->LGWCR &=~LCDC_LGWCR_GWE_MASK;

lcd->LDCR &= ~LCDC_LDCR_TM_MASK;

lcd->LDCR &= ~LCDC_LDCR_HM_MASK;

lcd->LDCR |= LCDC_LDCR_TM(0x7D);

lcd->LDCR |= LCDC_LDCR_HM(0x03);

//Set background plane DMA to burst mode

lcd->LDCR&=~LCDC_LDCR_BURST_MASK;

lcd->LGWDCR &= ~LCDC_LGWDCR_GWTM_MASK;

lcd->LGWDCR &= ~LCDC_LGWDCR_GWHM_MASK;

lcd->LGWDCR |= LCDC_LGWDCR_GWTM(0x7D);

lcd->LGWDCR |= LCDC_LGWDCR_GWHM(0x03);

//Set graphic window DMA to burst mode

lcd->LGWDCR&=~LCDC_LGWDCR_GWBT_MASK;

lcd->LGWSAR = GW_START_ADDRESS(0);

// set LCD graphic window size to be as big as the LCD display

lcd->LGWSR =

LCDC_LGWSR_GWW(GW_XSIZE/16) |

LCDC_LGWSR_GWH(GW_YSIZE);

// set LCD graphic window virtual page width

lcd->LGWVPWR = PAGE_XSIZE;

// set LCD graphic window panning offset

lcd->LGWPOR = 0;

// set LCD graphic window position to start in the upper left corner

lcd->LGWPR =

LCDC_LGWPR_GWXP(0) |

LCDC_LGWPR_GWYP(0);

// set LCD graphic window control

lcd->LGWCR =

LCDC_LGWCR_GWAV(0x00); //| // alpha-transparent (0xFF means opaque)

LCDC_LGWCR_GWE_MASK; // enable */

//set LCD cursor

lcd->LCPR = 0;

lcd->LCWHB =

LCDC_LCWHB_CH(26) |

LCDC_LCWHB_CW(1)|

LCDC_LCWHB_BD(20) |

LCDC_LCWHB_BK_EN_MASK;

lcd->LCCMR = 0;

//Start LCDC

SIM_MCR |= SIM_MCR_LCDSTART_MASK;

}

Thanks,

Slawek

Re: K70 LCDC wrapping the graphic window

EarlOrlando — Thu, 17 Dec 2015 01:05:13 GMT

Hello Slawek,

Your configurations seems to be Ok, please double check that the macros GW_XSIZE, GW_YSIZE and PAGE_XSIZE are correct. Also, please verify that the registers LCDC_LGWPR, LCDC_LGWVPWR and LCDC_LGWSR have the desired values.

What do you mean with "It is not possible to eliminate it by address offset"? I think that you are referring to the graphic window's position, please try to change the image's position inside the graphic window without modifying the graphic window's configuration.

Please let me know if this solves the issue.

Best regards,

Earl.

topic K70 LCDC wrapping the graphic window in Kinetis Microcontrollers

K70 LCDC wrapping the graphic window

Re: K70 LCDC wrapping the graphic window