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M
MNapi
Graduate II
November 8, 2024
Solved

does anybody have source code for LG4571 display (480 x 800)

  • November 8, 2024
  • 2 replies
  • 1279 views

there is nothing on  github.

 

there is initialization by SPI before the LTDC works

is there a sequence like you initialize it first over SPI then

MX_LTDC_Init() or it does not matter

I do have the initialization code but I am missing something

void SLGDP4571_Int(void)
{

SPI_WriteComm(0x20);

SPI_WriteComm(0x3A);
SPI_WriteData(0x70);

SPI_WriteComm(0xB1);
SPI_WriteData(0x10);
SPI_WriteData(0x14);
SPI_WriteData(0x06);

SPI_WriteComm(0xB2);
SPI_WriteData(0x00);
SPI_WriteData(0xC8);

SPI_WriteComm(0xB3);
SPI_WriteData(0x11);
SPI_WriteData(0xFF);

SPI_WriteComm(0xB4);
SPI_WriteData(0x10);

SPI_WriteComm(0xB6);
SPI_WriteData(0x08);
SPI_WriteData(0x18);
SPI_WriteData(0x02);
SPI_WriteData(0x40);
SPI_WriteData(0x10);

SPI_WriteComm(0xB7);
SPI_WriteData(0x00);
SPI_WriteData(0x10);
SPI_WriteData(0x01);

SPI_WriteComm(0xC3);
SPI_WriteData(0x04);
SPI_WriteData(0x05);
SPI_WriteData(0x04);
SPI_WriteData(0x04);
SPI_WriteData(0x01);

SPI_WriteComm(0xC4);
SPI_WriteData(0x22);
SPI_WriteData(0x03);
SPI_WriteData(0x00);
SPI_WriteData(0x1A);
SPI_WriteData(0x1A);
SPI_WriteData(0x05);
SPI_WriteData(0x00);
SPI_WriteData(0x04);

SPI_WriteComm(0xC5);
SPI_WriteData(0x6C);

SPI_WriteComm(0xC6);
SPI_WriteData(0x23);
/****
SPI_WriteComm(0xC8);
SPI_WriteData(0x01);
SPI_WriteData(0x01);
SPI_WriteData(0x03);
SPI_WriteData(0xFF);
***/

SPI_WriteComm(0xD0);
SPI_WriteData(0x00);
SPI_WriteData(0x43);
SPI_WriteData(0x64);
SPI_WriteData(0x25);
SPI_WriteData(0x10);
SPI_WriteData(0x02);
SPI_WriteData(0x71);
SPI_WriteData(0x44);
SPI_WriteData(0x04);

SPI_WriteComm(0xD1);
SPI_WriteData(0x00);
SPI_WriteData(0x43);
SPI_WriteData(0x64);
SPI_WriteData(0x25);
SPI_WriteData(0x10);
SPI_WriteData(0x02);
SPI_WriteData(0x71);
SPI_WriteData(0x44);
SPI_WriteData(0x04);

SPI_WriteComm(0xD2);
SPI_WriteData(0x00);
SPI_WriteData(0x43);
SPI_WriteData(0x64);
SPI_WriteData(0x25);
SPI_WriteData(0x10);
SPI_WriteData(0x02);
SPI_WriteData(0x71);
SPI_WriteData(0x44);
SPI_WriteData(0x04);

SPI_WriteComm(0xD3);
SPI_WriteData(0x00);
SPI_WriteData(0x43);
SPI_WriteData(0x64);
SPI_WriteData(0x25);
SPI_WriteData(0x10);
SPI_WriteData(0x02);
SPI_WriteData(0x71);
SPI_WriteData(0x44);
SPI_WriteData(0x04);

SPI_WriteComm(0xC2);
SPI_WriteData(0x08);
HAL_Delay(20);
SPI_WriteComm(0xC2);
SPI_WriteData(0x18);
HAL_Delay(20);
SPI_WriteComm(0xC2);
SPI_WriteData(0xB8);
HAL_Delay(20);
SPI_WriteComm(0xB5);
SPI_WriteData(0x01);
HAL_Delay(20);
SPI_WriteComm(0x29);
HAL_Delay(20);

}

 

 

    This topic has been closed for replies.
    Best answer by MNapi

    This is not the first time I am having problem to send data over SPI, that was the problem again.

    You would have to see on logic analyzer to compare the waves.

    So I disabled SPI and assigned PINs as output. And I made my own SPI interface using pins as output. And it worked fine, the display is initializing and working.

     

    void SPI_SendData(unsigned char i)
{
unsigned char n;

for(n=0; n<8; n++)
{
if(i&0x80) HAL_GPIO_WritePin(GPIOI, GPIO_PIN_3, GPIO_PIN_SET);
else HAL_GPIO_WritePin(GPIOI, GPIO_PIN_3, GPIO_PIN_RESET);
i<<= 1;

HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9, GPIO_PIN_RESET);//_nop_(); _nop_();_nop_();_nop_();

HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9, GPIO_PIN_SET);//_nop_();_nop_();_nop_();_nop_();

}
}

     

    If somebody has similar problem with initialization over SPI does not work that might be the solution.

    Maybe somebody from STM can collaborate?

    2 replies

    M
    mƎALLEm
    Technical Moderator
    November 8, 2024

    Hello @MNapi ,

    Please use </> button to share your code.. I've edited your post then.. 

    Please refer to the tips on how to post a thread.

    M
    MNapiAuthorAnswer
    Graduate II
    November 9, 2024

    This is not the first time I am having problem to send data over SPI, that was the problem again.

    You would have to see on logic analyzer to compare the waves.

    So I disabled SPI and assigned PINs as output. And I made my own SPI interface using pins as output. And it worked fine, the display is initializing and working.

     

    void SPI_SendData(unsigned char i)
{
unsigned char n;

for(n=0; n<8; n++)
{
if(i&0x80) HAL_GPIO_WritePin(GPIOI, GPIO_PIN_3, GPIO_PIN_SET);
else HAL_GPIO_WritePin(GPIOI, GPIO_PIN_3, GPIO_PIN_RESET);
i<<= 1;

HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9, GPIO_PIN_RESET);//_nop_(); _nop_();_nop_();_nop_();

HAL_GPIO_WritePin(GPIOA, GPIO_PIN_9, GPIO_PIN_SET);//_nop_();_nop_();_nop_();_nop_();

}
}

     

    If somebody has similar problem with initialization over SPI does not work that might be the solution.

    Maybe somebody from STM can collaborate?

    T
    Tesla DeLorean
    Graduate II
    November 9, 2024

    >>Maybe somebody from STM can collaborate?

    Work with your account's FAE (support enginer), or other engineers on your team.

    >>If somebody has similar problem with initialization over SPI does not work that might be the solution.

    Probably timing or edge/phase configuration issues.

    Check controller data sheet about expectations for CS, and data timing expectations.

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