SD卡程序錯誤

Question

我在Linux中運行SD卡程序，但我發現以下錯誤....但我也包括頭文件

anish@ubuntu:~/Desktop/testing/sd card$ gcc -o sdcard sdcard.c
/usr/lib/gcc/i486-linux-gnu/4.4.3/../../../../lib/crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
/tmp/ccVMCgzn.o: In function `SDCardInit':
sdcard.c:(.text+0x23): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x4d): undefined reference to `SPI1Send'
sdcard.c:(.text+0x8b): undefined reference to `SPI1Byte'
sdcard.c:(.text+0xb2): undefined reference to `SPI1Send'
sdcard.c:(.text+0xfd): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x102): undefined reference to `CRC16Bit_GenTable'
/tmp/ccVMCgzn.o: In function `SDResponseMatch':
sdcard.c:(.text+0x128): undefined reference to `SPI1Byte'
/tmp/ccVMCgzn.o: In function `SDResponseDontMatch':
sdcard.c:(.text+0x162): undefined reference to `SPI1Byte'
/tmp/ccVMCgzn.o: In function `SDWriteBlock':
sdcard.c:(.text+0x1db): undefined reference to `CRC_7Bit'
sdcard.c:(.text+0x202): undefined reference to `SPI1Send'
sdcard.c:(.text+0x23b): undefined reference to `CRC_16Bit'
sdcard.c:(.text+0x24a): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x25d): undefined reference to `SPI1Send'
sdcard.c:(.text+0x26b): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x27b): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x287): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x2f7): undefined reference to `SPI1Byte'
/tmp/ccVMCgzn.o: In function `SDReadBlockPart':
sdcard.c:(.text+0x35e): undefined reference to `CRC_7Bit'
sdcard.c:(.text+0x388): undefined reference to `SPI1Send'
sdcard.c:(.text+0x3f0): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x3ff): undefined reference to `CRC_16Bit_AddByte'
sdcard.c:(.text+0x41c): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x43b): undefined reference to `CRC_16Bit_AddByte'
sdcard.c:(.text+0x463): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x472): undefined reference to `CRC_16Bit_AddByte'
sdcard.c:(.text+0x48e): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x4a0): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x4d6): undefined reference to `SPI1Byte'
/tmp/ccVMCgzn.o: In function `SDWriteBlockHead':
sdcard.c:(.text+0x53c): undefined reference to `CRC_7Bit'
sdcard.c:(.text+0x563): undefined reference to `SPI1Send'
sdcard.c:(.text+0x59b): undefined reference to `CRC_16Bit'
s    dcard.c:(.text+0x5aa): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x5ca): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x5f0): undefined reference to `CRC_16Bit_AddByte'
sdcard.c:(.text+0x5ff): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x616): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x626): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x632): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x6a2): undefined reference to `SPI1Byte'
/tmp/ccVMCgzn.o: In function `SDWriteMultiBlock':
sdcard.c:(.text+0x702): undefined reference to `CRC_7Bit'
sdcard.c:(.text+0x729): undefined reference to `SPI1Send'
sdcard.c:(.text+0x76e): undefined reference to `CRC_16Bit'
sdcard.c:(.text+0x77d): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x790): undefined reference to `SPI1Send'
sdcard.c:(.text+0x7a5): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x7b5): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x7c1): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x7fa): undefined reference to `SPI1Byte'
sdcard.c:(.text+0x847): undefined reference to `SPI1Byte'

Answer 1

在我看來你忘了鏈接幾個庫。

或者如果你想生成一個目標文件以便以后鏈接它，這會更好

gcc -o sdcard.o sdcard.c

Answer 2

crt1.o 是C運行時 。 它指定了啟動程序的位置以及其他一些內容。 執行從_start符號開始，然后跳轉到程序中定義的main。 所以從錯誤

In function `_start':
(.text+0x18): undefined reference to `main'

我的猜測是您可能拼錯了main函數，可能是您將其命名為Main或其他名稱。

對於其他錯誤，您需要鏈接提供這些函數的庫，或者，如果您在其他源文件中使用函數，則還需要編譯它們，然后將所有這些文件鏈接在一起。