stm32f103 and winstar TFT display problem

[rafal_kula]

Posted on March 09, 2016 at 14:24

Hi all,

I have problem with displaying any data at WF57STIACDNN0 TFT display. This is a TFT display with ST7511U driver. In my SW driver I successfully pass the display initialization procedure - I see some randomize pixels set, but I am NOT able to display any data by write RAM command - 0x2C (ST75_WRAM). First my goal is to clear whole display and set each pixel on the screen. For communication I am using 4 line (A0 + SPI). In the past I only wrote some drivers for easy ALPHA display so I have no any knowledge about graphic display. Below I will put by initialize function and function where I would like to clear whole display area. static

void

display_init()

{

CS_ENABLE

;

spi_write_command(

ST75_SWRESET

);

spi_write_data(

0xa5

);

//Power

Control

spi_write_command(

ST75_PWRCTL

);

spi_write_data(

0x8f

);

//booster

setting

=

''10''

=

-2

??

spi_write_data(

0x04

);

//SAMPSet

=

''100''

??

spi_write_data(

0xa5

);

//WARNING

in

spec

is

0x0a5

??

spi_write_data(

0xa5

);

//Electronic

Volume

Set

1

spi_write_command(

ST75_EVSET1

);

spi_write_data(

0x36

);

//VCOM

??

spi_write_data(

0x0b

);

//VGHREG

??

spi_write_data(

0x0b

);

//VGLREG

??

spi_write_data(

0xa5

);

//Display

area

spi_write_command(

0x31

);

spi_write_data(

0x00

);

spi_write_data(

0xEF

);

//0

-

239

=

240

spi_write_data(

0x02

);

spi_write_data(

0x7F

);

//Display

Set

2:

Set

source

and

gate

ON/OFF

timing

spi_write_command(

ST75_DISSET2

);

spi_write_data(

0x07

);

spi_write_data(

0x2c

);

spi_write_data(

0x09

);

spi_write_data(

0x2a

);

//Electronic

Volume

Set

2

spi_write_command(

ST75_EVSET2

);

spi_write_data(

0x09

);

//GVDD[4:0]

??

spi_write_data(

0x17

);

//GVCL[4:0]

??

spi_write_data(

0xa5

);

//

spi_write_data(

0xa5

);

//

//Gamma

Set

4bpp

Positive

1

spi_write_command(

ST75_GAMSET4P1

);

spi_write_data(

0x00

);

spi_write_data(

0x16

);

spi_write_data(

0x1B

);

spi_write_data(

0x1C

);

spi_write_command(

ST75_GAMSET4P2

);

spi_write_data(

0x1E

);

spi_write_data(

0x1F

);

spi_write_data(

0x20

);

spi_write_data(

0x21

);

spi_write_command(

ST75_GAMSET4P3

);

spi_write_data(

0x23

);

spi_write_data(

0x24

);

spi_write_data(

0x26

);

spi_write_data(

0x28

);

spi_write_command(

ST75_GAMSET4P4

);

spi_write_data(

0x2B

);

spi_write_data(

0x2F

);

spi_write_data(

0x34

);

spi_write_data(

0x3f

);

//Gamma

Set

4bpp

Negative

1

spi_write_command(

ST75_GAMSET4N1

);

spi_write_data(

0x00

);

spi_write_data(

0x16

);

spi_write_data(

0x1B

);

spi_write_data(

0x1C

);

spi_write_command(

ST75_GAMSET4N2

);

spi_write_data(

0x1E

);

spi_write_data(

0x1F

);

spi_write_data(

0x20

);

spi_write_data(

0x21

);

spi_write_command(

ST75_GAMSET4N3

);

spi_write_data(

0x23

);

spi_write_data(

0x24

);

spi_write_data(

0x26

);

spi_write_data(

0x28

);

spi_write_command(

ST75_GAMSET4N4

);

spi_write_data(

0x2B

);

spi_write_data(

0x2F

);

spi_write_data(

0x34

);

spi_write_data(

0x3F

);

//Sleep

Out

spi_write_command(

ST75_SLPOUT

);

spi_write_data(

0xA5

);

&sharpif

1

/*

is

set

to

ZERO

by

default

!!!*/

//Memory

Address

Control:

Set

about

display

data

RAM.

/*

Select

address

incremental

direction:

*

MV

-

0

(Incremental

column

addr.)

*

Display

data

RAM

page

address:

*

MY

-

0

(Normal)

*

Display

data

RAM

column

address

*

MX

-

0

(Normal)

*/

spi_write_command(

ST75_MADCTL

);

//sleep_ms(2);

//sleep

is

required

by

specyficatrion

ST7511U

spi_write_data(

0x00

);

//in

spec

is

set

to

0x01

[F57STIACDNN0]

spi_write_data(

0xA5

);

spi_write_data(

0xA5

);

spi_write_data(

0xA5

);

&sharpendif

//BPP

Select:

Set

data

format

(bit

per

pixel)

BPP

spi_write_command(

ST75_BPPSEL

);

spi_write_data(

0x00

);

//

1bpp,

(2

gray

scale)

1

bit

per

pixel

spi_write_data(

0xA5

);

spi_write_data(

0xA5

);

spi_write_data(

0xA5

);

spi_write_command(

0x25

);

//page

address

set

spi_write_data(

0x00

);

//start

0

spi_write_data(

0x29

);

//end

41

spi_write_data(

0x00

);

spi_write_data(

0xa5

);

spi_write_command(

0x26

);

//Collumn

address

set

spi_write_data(

0x00

);

//start

0

spi_write_data(

0x00

);

//

spi_write_data(

0x01

);

//end

479

spi_write_data(

0xdf

);

//Display

on

spi_write_command(

ST75_DISON

);

spi_write_data(

0xA5

);

asm

(

''NOP''

);

CS_DISABLE

;

}

And hear the function when I would like to clear whole display area:

void

ST75_display_clr()

{

UInt16_t

i,j;

//640/320

ST75_set_window(

0

,

639

,

0

,

320

);

spi_write_command(

ST75_WRRAM

);

for

(i=

0

; i<

30

; i++) {

for

(j =

0

; j<

639

; j++) {

spi_write_data(

0x00

);

}

}

}

//640/320

static

void

ST75_set_window(

UInt16_t

s_x,

UInt16_t

e_x,

UInt16_t

s_y,

UInt16_t

e_y)

{

//x,

max

=

640

//CSA:

Set

column

START

addres

spi_write_command(

ST75_CASET

);

spi_write_data(s_x >>

8

);

spi_write_data((

UInt8_t

)s_x);

//max

=

//CEA:

Set

column

END

address

spi_write_data(e_x >>

8

);

//end

479

spi_write_data((

UInt8_t

)e_x);

//y,

max

=

160

spi_write_command(

ST75_PASET

);

//PSA:

Set

page

START

address

spi_write_data(s_y);

//x

max

=

//PEA:

Set

page

END

address

spi_write_data(e_y);

//DEFAULT

//FrmA:

Set

frame

address

-

00

spi_write_data(

0x00

);

//DEFAULT

spi_write_data(

0xA5

);

}

Br, ToR #tf #winstar #display #lcd #stm32