wemos D1 mini兼容SD卡防护罩，无法建立与wemos的连接怎么解决？

你好。
我刚收到几个 wemos D1 mini 兼容 SD卡防护罩。
作为第一个测试，我试图运行几个演示程序。见下文。
问题是，代码可以正常编译并上传到 wemos D1，但前提是未连接 SD-shield。
如果我安装屏蔽，则无法建立与 wemos 的连接。
对此有任何想法将不胜感激。
ps 我从 Arduino IDE 和 Platformio 试过了……一样
代码：全选/*
* Micro SD Shield - Read/Write
*
* This example shows how to read and write data
* to and from an SD card file
*
* The WeMos Micro SD Shield uses:
* D5, D6, D7, D8, 3V3 and G
*
* The shield uses SPI bus pins:
* D5 = CLK
* D6 = MISO
* D7 = MOSI
* D8 = CS
*
* The SD card library uses 8.3 format filenames
* and is case-insensitive.
* eg. IMAGE.JPG is the same as image.jpg
*
* created Nov 2010 by David A. Mellis
* modified 9 Apr 2012 by Tom Igoe
*
* This example code is in the public domain.
* https://github.com/esp8266/Arduino/blob/master/libraries/SD/examples/ReadWrite/ReadWrite.ino
*/

#include "SPI.h"
#include "SD.h"

const int chipSelect = D8;
File myFile;

void setup()
{
  // Open serial communications and wait for port to open:
  Serial.begin(9600);
  while (!Serial) {
    ; // wait for serial port to connect.
  }

  Serial.print("Initializing SD card...");

  if (!SD.begin(chipSelect)) {
    Serial.println("initialization failed!");
    return;
  }
  Serial.println("initialization done.");

  /* open the file.
   * note that only one file can be open at a time
   */
  myFile = SD.open("test.txt", FILE_WRITE);

  // if the file opened okay, write to it:
  if (myFile) {
    Serial.print("Writing to test.txt...");
    myFile.println("testing 1, 2, 3.");
    // close the file:
    myFile.close();
    Serial.println("done.");
  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }

  // re-open the file for reading:
  myFile = SD.open("test.txt");
  if (myFile) {
    Serial.println("test.txt:");

    // read from the file until there's nothing else in it:
    while (myFile.available()) {
      Serial.write(myFile.read());
    }
    // close the file:
    myFile.close();
  } else {
    // if the file didn't open, print an error:
    Serial.println("error opening test.txt");
  }
}

void loop()
{
  // nothing happens after setup
}