RTT 单色SPI屏幕硬件SPI 一打开中断向量重定向，屏幕刷新特别慢

发布于 2021-11-07 15:51:44 浏览：1359 订阅该版

问题是，正常跑系统rtt标准版，硬件SPI刷新屏幕（JLX256128），速度还可以。准备加入bootloader，中断向量重定向，结果一打开中断向量重定向，屏幕刷新就慢了？

环境：RT-Thread Studio 2.1.2
组件：ota_downloader
硬件：GD32F103RGT6+JLX256128单色屏幕

下面是开启重定向的代码
```c
/**
 * Function    ota_app_vtor_reconfig
 * Description Set Vector Table base location to the start addr of app(RT_APP_PART_ADDR).
*/
static int ota_app_vtor_reconfig(void)
{
    #define NVIC_VTOR_MASK   0x3FFFFF80
    /* Set the Vector Table base location by user application firmware definition */
    SCB->VTOR = 0x8020000 & NVIC_VTOR_MASK;

return 0;
}
INIT_BOARD_EXPORT(ota_app_vtor_reconfig);
```
这是SPI初始化代码及数据传输代码
```c
static int rt_hw_spi_lcd_init(void)
{
    __HAL_RCC_GPIOB_CLK_ENABLE();

rt_hw_spi_device_attach("spi3", GLX256128G_929_SPI_DEV, GPIOA, GPIO_PIN_15);
    struct rt_spi_configuration cfg;

/* ���� spi �豸��ȡ�豸��� */
    lcd_spi_dev = (struct rt_spi_device *)rt_device_find(GLX256128G_929_SPI_DEV);

if (GLX256128G_929_SPI_DEV==NULL) {
        rt_kprintf("=============err==================");
    }
    else {
        cfg.data_width = 8;
        cfg.mode = RT_SPI_MASTER | RT_SPI_MODE_0 | RT_SPI_MSB;
        cfg.max_hz = 50 * 1000 *1000;                           /* 20M */
        rt_spi_configure(lcd_spi_dev, &cfg);
    }
    return RT_EOK;
}
/* �������Զ���ʼ�� */
INIT_COMPONENT_EXPORT(rt_hw_spi_lcd_init);
void spi3_send_char(rt_uint8_t ch)
{
    struct rt_spi_message msg1;

msg1.send_buf   = &ch;
    msg1.recv_buf   = RT_NULL;
    msg1.length     = 1;
    msg1.cs_take    = 1;
    msg1.cs_release = 1;
    msg1.next       = RT_NULL;
    rt_spi_transfer_message(lcd_spi_dev, &msg1);
}
rt_uint8_t spi3_rev_char()
{
    struct rt_spi_message msg2;
    rt_uint8_t id = 0;

msg2.send_buf   = RT_NULL;
    msg2.recv_buf   = &id;
    msg2.length     = 1;
    msg2.cs_take    = 1;
    msg2.cs_release = 1;
    msg2.next       = RT_NULL;

rt_spi_transfer_message(lcd_spi_dev, &msg2);
    return id;
}
void LCD_CS_H(void)
{
    rt_spi_release(lcd_spi_dev);
}
void LCD_CS_L(void)
{
    rt_spi_take(lcd_spi_dev);
}
```