卡失败或未提供 Arduino Mega

Question

我正在尝试读取数据并将数据写入 SD 卡，但在代码开始时，我收到错误 Card Failed or not present。我更改了为 Arduino Uno 编写的示例代码中的引脚，但仍然给出相同的错误。我正在使用 Arduino Mega 2560。我该如何解决这个问题？我的代码在这里：

#include <SD.h>

// On the Ethernet Shield, CS is pin 4. Note that even if it's not
// used as the CS pin, the hardware CS pin (10 on most Arduino boards,
// 53 on the Mega) must be left as an output or the SD library
// functions will not work.
const int chipSelect = 53;

void setup()
{
 Serial.begin(9600);
 Serial.print("Initializing SD card...");
 // make sure that the default chip select pin is set to
 // output, even if you don't use it:
 pinMode(53, OUTPUT);

 // see if the card is present and can be initialized:
 if (!SD.begin(chipSelect)) {
 Serial.println("Card failed, or not present");
 // don't do anything more:
 return;
 }
 Serial.println("card initialized.");
 }

 void loop()
 {

 }

Answer 1

请添加：

digitalWrite(53, HIGH);

如果它很低，Wiznet 芯片会破坏 SPI 总线。 (More details)