LVGL加载外部flash上图片

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void loadBitmap(lv_img_dsc_t *image, uint32_t start_addr, uint32_t file_size)
{
    uint8_t *pbuf;        //读取数据缓冲区
    uint8_t *pbmp;
    uint32_t header;
    int secTime = file_size/4096;
    int secOff = file_size%4096;
    int i;
    dbg_printf(" secTime = %d, secOff = %d\r\n", secTime, secOff);

    pbuf = lv_mem_alloc(file_size);

    for (i=0; i<secTime; i++) {
        SPI_Flash_Read(&pbuf[i*4096], start_addr+i*4096, 4096);
    }
    if (secOff>0) {
        SPI_Flash_Read(&pbuf[secTime*4096], start_addr+secTime*4096, secOff);
    }
    /* 获取图片数据流 */
    pbmp = (uint8_t *)pbuf + 4;
    /* 获取头 */
    header = (uint32_t)pbuf[3] << 24;
    header |= (uint32_t)pbuf[2] << 16;
    header |= (uint32_t)pbuf[1] << 8;
    header |= (uint32_t)pbuf[0];

    image->header.cf = pbuf[0];
    image->header.always_zero = 0;
    image->header.w = (uint16_t)(header >> 10);
    image->header.h = (uint16_t)(header >> 21);
    image->data_size = file_size - 4;
    image->data = pbmp;
}