因此，需要将二者按照定义连接在一起，SD 卡模块上的CS接至D4 Pin。之后，运行 Example 中的CardInfo即可：
/*
SD card test
This example shows how use the utility libraries on which the'
SD library is based in order to get info about your SD card.
Very useful for testing a card when you're not sure whether its working or not.
The circuit:
* SD card attached to SPI bus as follows:
** MOSI - pin 11 on Arduino Uno/Duemilanove/Diecimila
** MISO - pin 12 on Arduino Uno/Duemilanove/Diecimila
** CLK - pin 13 on Arduino Uno/Duemilanove/Diecimila
** CS - depends on your SD card shield or module.
Pin 4 used here for consistency with other Arduino examples
created 28 Mar 2011
by Limor Fried
modified 9 Apr 2012
by Tom Igoe
*/
// include the SD library:
#include <SPI.h>
#include <SD.h>
// set up variables using the SD utility library functions:
Sd2Card card;
SdVolume volume;
SdFile root;
// change this to match your SD shield or module;
// Arduino Ethernet shield: pin 4
// Adafruit SD shields and modules: pin 10
// Sparkfun SD shield: pin 8
// MKRZero SD: SDCARD_SS_PIN
const int chipSelect = 4;
void setup() {
// Open serial communications and wait for port to open:
Serial.begin(9600);
while (!Serial) {
; // wait for serial port to connect. Needed for native USB port only
}
Serial.print("\nInitializing SD card...");
// we'll use the initialization code from the utility libraries
// since we're just testing if the card is working!
if (!card.init(SPI_HALF_SPEED, chipSelect)) {
Serial.println("initialization failed. Things to check:");
Serial.println("* is a card inserted?");
Serial.println("* is your wiring correct?");
Serial.println("* did you change the chipSelect pin to match your shield or module?");
return;
} else {
Serial.println("Wiring is correct and a card is present.");
}
// print the type of card
Serial.print("\nCard type: ");
switch (card.type()) {
case SD_CARD_TYPE_SD1:
Serial.println("SD1");
break;
case SD_CARD_TYPE_SD2:
Serial.println("SD2");
break;
case SD_CARD_TYPE_SDHC:
Serial.println("SDHC");
break;
default:
Serial.println("Unknown");
}
// Now we will try to open the 'volume'/'partition' - it should be FAT16 or FAT32
if (!volume.init(card)) {
Serial.println("Could not find FAT16/FAT32 partition.\nMake sure you've formatted the card");
return;
}
// print the type and size of the first FAT-type volume
uint32_t volumesize;
Serial.print("\nVolume type is FAT");
Serial.println(volume.fatType(), DEC);
Serial.println();
volumesize = volume.blocksPerCluster(); // clusters are collections of blocks
volumesize *= volume.clusterCount(); // we'll have a lot of clusters
volumesize *= 512; // SD card blocks are always 512 bytes
Serial.print("Volume size (bytes): ");
Serial.println(volumesize);
Serial.print("Volume size (Kbytes): ");
volumesize /= 1024;
Serial.println(volumesize);
Serial.print("Volume size (Mbytes): ");
volumesize /= 1024;
Serial.println(volumesize);
Serial.println("\nFiles found on the card (name, date and size in bytes): ");
root.openRoot(volume);
// list all files in the card with date and size
root.ls(LS_R | LS_DATE | LS_SIZE);
}
void loop(void) {
}
#include <Uefi.h>
#include <Library/UefiLib.h>
#include <Library/ShellCEntryLib.h>
/***
Print a welcoming message.
Establishes the main structure of the application.
@retval 0 The application exited normally.
@retval Other An error occurred.
***/
INTN
EFIAPI
ShellAppMain (
IN UINTN Argc,
IN CHAR16 **Argv
)
{
Print(L"Hello there fellow Programmer.\n");
Print(L"Welcome to the world of EDK II.\n");
return(0);
}
这个代码功能很简单，就是显示两行字符串。生成的代码为 8,160 （0x1FE0）bytes大小。
特别的，要在对应的INF文件中加入下面的语句保证生成 COD文件。
[BuildOptions]
MSFT:*_*_X64_CC_FLAGS = /FAsc /Od
接下来使用 SFF 工具直接分析 EFI：
1.从 0 到 0x3C 是一个 Dos Header。这个只是作为兼容性的结构存在并没有任何功能。
///
/// @attention
/// EFI_IMAGE_HEADERS64 is for use ONLY by tools.
///
typedef struct {
UINT32 Signature;
EFI_IMAGE_FILE_HEADER FileHeader;
EFI_IMAGE_OPTIONAL_HEADER64 OptionalHeader;
} EFI_IMAGE_NT_HEADERS64;
///
/// Debug Directory Format.
///
typedef struct {
UINT32 Characteristics;
UINT32 TimeDateStamp;
UINT16 MajorVersion;
UINT16 MinorVersion;
UINT32 Type;
UINT32 SizeOfData;
UINT32 RVA; ///< The address of the debug data when loaded, relative to the image base.
UINT32 FileOffset; ///< The file pointer to the debug data.
} EFI_IMAGE_DEBUG_DIRECTORY_ENTRY;
Start Length Name Class
0001:00000000 000012f7H .text$mn CODE
0002:00000000 000006f4H .rdata DATA
0002:000006f4 00000110H .rdata$zzzdbg DATA
0003:00000000 00000020H .data DATA
0003:00000020 00000020H .bss DATA
0004:00000000 000000a8H .pdata DATA
0005:00000000 00000084H .xdata DATA
/**
Internal function that convert a number to a string in Buffer.
Print worker function that converts a decimal or hexadecimal number to an ASCII string in Buffer.
@param Buffer Location to place the ASCII string of Value.
@param Value The value to convert to a Decimal or Hexadecimal string in Buffer.
@param Radix Radix of the value
@return A pointer to the end of buffer filled with ASCII string.
**/
CHAR8 *
BasePrintLibValueToString (
IN OUT CHAR8 *Buffer,
IN INT64 Value,
IN UINTN Radix
)
{
UINT32 Remainder;
//
// Loop to convert one digit at a time in reverse order
//
*Buffer = 0;
do {
Value = (INT64)DivU64x32Remainder ((UINT64)Value, (UINT32)Radix, &Remainder);
*(++Buffer) = mHexStr[Remainder];
} while (Value != 0);
//
// Return pointer of the end of filled buffer.
//
return Buffer;
}
