ili9488 rgb接口初始化问题

9488的rgb接口使用前需要通过4线spi进行寄存器初始化，供应商表示，在spi初始化完成后，不进行送显的情况下，屏幕会显示为满屏雪花状态。

我根据供应商给我的spi初始化驱动，通过GPIO模拟spi进行初始化，始终无法达到以上描述的效果，也用逻辑分析仪拉过波形了，结合9488的手册，也没有看出到底有啥问题。

请问有用过9488 rgb接口的朋友么？有相关经验分享么？

谢谢！

部分代码及波形如下：

static void _lcd_spi_gpio_config(void)
{
    GPIO_InitTypeDef GPIO_InitStruct = {0};

    LCD_SPI_RST_CLK_ENABLE;
    LCD_SPI_CS_CLK_ENABLE;
    LCD_SPI_RS_CLK_ENABLE;
    LCD_SPI_SCK_CLK_ENABLE;
    LCD_SPI_MOSI_CLK_ENABLE;
    LCD_SPI_MISO_CLK_ENABLE;

    GPIO_InitStruct.Pin = LCD_SPI_RST_PIN | LCD_SPI_CS_PIN | LCD_SPI_RS_PIN;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(LCD_SPI_RST_PORT, &GPIO_InitStruct);
    GPIO_InitStruct.Pin = LCD_SPI_SCK_PIN | LCD_SPI_MOSI_PIN;
    HAL_GPIO_Init(LCD_SPI_SCK_PORT, &GPIO_InitStruct);
    GPIO_InitStruct.Pin = LCD_SPI_MISO_PIN;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(LCD_SPI_MISO_PORT, &GPIO_InitStruct);
    
    LCD_SPI_CS(1);
    LCD_SPI_SCK(0);

    LCD_SPI_RST(1);
    HAL_Delay(100);
    LCD_SPI_RST(0);
    HAL_Delay(1);
    LCD_SPI_RST(1);
    HAL_Delay(150);
}

//写寄存器函数
// regval:寄存器值
static void _lcd_write_index(unsigned char REG)
{
    unsigned char i;
    LCD_SPI_CS(0); // LCD_CS = 0;

    LCD_SPI_RS(0); // LCD_RS = 0;//COMMAND
    _spi_delay(1);
    LCD_SPI_SCK(0); // LCD_SCL = 0;
    _spi_delay(1);

    for (i = 0; i < 8; i++)
    {
        if (REG & 0x80)
            LCD_SPI_MOSI(1); // LCD_SDA = 1;
        else
            LCD_SPI_MOSI(0); // LCD_SDA = 0;

        REG <<= 1;
        _spi_delay(1);
        LCD_SPI_SCK(1); // LCD_SCL = 1;
        _spi_delay(1);
        LCD_SPI_SCK(0); // LCD_SCL = 0;
    }               //送低8位
    LCD_SPI_MOSI(0);
    LCD_SPI_RS(1);      // LCD_RS = 1;
    LCD_SPI_CS(1);      // LCD_CS=1;
    
    _spi_delay(3);
}

//送参数
static void _lcd_write_byte(unsigned char PA)
{
    unsigned char i;
    LCD_SPI_CS(0); // LCD_CS = 0;

    LCD_SPI_RS(1);  // LCD_RS = 1;//data
    _spi_delay(1);
    LCD_SPI_SCK(0); // LCD_SCL = 0;
    _spi_delay(1);

    for (i = 0; i < 8; i++)
    {
        if (PA & 0x80)
            LCD_SPI_MOSI(1); // LCD_SDA = 1;
        else
            LCD_SPI_MOSI(0); // LCD_SDA = 0;

        PA <<= 1;
        _spi_delay(1);
        LCD_SPI_SCK(1); // LCD_SCL = 1;
        _spi_delay(1);
        LCD_SPI_SCK(0); // LCD_SCL = 0;
    }               //送低8位
    LCD_SPI_MOSI(0);
    LCD_SPI_RS(1);      // LCD_RS = 1;//data

    _spi_delay(3);
}

static void _lcd_spi_init_ver(void) //竖屏
{
    //*************LCD Driver Initial **********//
    _lcd_write_index(0xE0);
    _lcd_write_byte(0x00);
    _lcd_write_byte(0x07);
    _lcd_write_byte(0x10);
    _lcd_write_byte(0x09);
    _lcd_write_byte(0x17);
    _lcd_write_byte(0x0B);
    _lcd_write_byte(0x40);
    _lcd_write_byte(0x8A);
    _lcd_write_byte(0x4B);
    _lcd_write_byte(0x0A);
    _lcd_write_byte(0x0D);
    _lcd_write_byte(0x0F);
    _lcd_write_byte(0x15);
    _lcd_write_byte(0x16);
    _lcd_write_byte(0x0F);

    _lcd_write_index(0xE1);
    _lcd_write_byte(0x00);
    _lcd_write_byte(0x1A);
    _lcd_write_byte(0x1B);
    _lcd_write_byte(0x02);
    _lcd_write_byte(0x0D);
    _lcd_write_byte(0x05);
    _lcd_write_byte(0x30);
    _lcd_write_byte(0x35);
    _lcd_write_byte(0x43);
    _lcd_write_byte(0x02);
    _lcd_write_byte(0x0A);
    _lcd_write_byte(0x09);
    _lcd_write_byte(0x32);
    _lcd_write_byte(0x36);
    _lcd_write_byte(0x0F);

    _lcd_write_index(0xB1);
    _lcd_write_byte(0xB0);
    _lcd_write_byte(0x11);

    _lcd_write_index(0xB4);
    _lcd_write_byte(0x02);

    _lcd_write_index(0xC0);
    _lcd_write_byte(0x17);
    _lcd_write_byte(0x15);

    _lcd_write_index(0xC1);
    _lcd_write_byte(0x41);

    _lcd_write_index(0xC5);
    _lcd_write_byte(0x00);
    _lcd_write_byte(0x20); //
    _lcd_write_byte(0x80);

    _lcd_write_index(0xB6);
    _lcd_write_byte(0x20); // 0X20
    _lcd_write_byte(0x22);

    _lcd_write_index(0x36);
    _lcd_write_byte(0x40); //差异 1

    _lcd_write_index(0x3a);
    _lcd_write_byte(0x66);   //RGB666
    // _lcd_write_byte(0x55);   //RGB565

    _lcd_write_index(0xE9);
    _lcd_write_byte(0x00);

    _lcd_write_index(0XF7);
    _lcd_write_byte(0xA9);
    _lcd_write_byte(0x51);
    _lcd_write_byte(0x2C);
    _lcd_write_byte(0x82);

    _lcd_write_index(0x11);
    HAL_Delay(120);
    _lcd_write_index(0x29);

    _lcd_write_index(0x2B);
    _lcd_write_byte(0x00);
    _lcd_write_byte(0x00);
    _lcd_write_byte(0x01);
    _lcd_write_byte(0xDF); // 480 //差异 2

    _lcd_write_index(0x2A);
    _lcd_write_byte(0x00);
    _lcd_write_byte(0x00);
    _lcd_write_byte(0x01);
    _lcd_write_byte(0x3F);
}

void lcd_spi_init(void)
{
    _lcd_spi_gpio_config();
    _lcd_spi_init_ver();

    HAL_Delay(1);
    LCD_SPI_CS(1);
    while(1);
}

总体波形

局部波形_1

局部波形_2

局部波形_3