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Diffstat (limited to 'libraries/SD/examples/DumpFile')
-rw-r--r-- | libraries/SD/examples/DumpFile/DumpFile.pde | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/libraries/SD/examples/DumpFile/DumpFile.pde b/libraries/SD/examples/DumpFile/DumpFile.pde new file mode 100644 index 0000000..961717f --- /dev/null +++ b/libraries/SD/examples/DumpFile/DumpFile.pde @@ -0,0 +1,64 @@ +/* + SD card file dump + + This example shows how to read a file from the SD card using the + SD library and send it over the serial port. + + The circuit: + * SD card attached to SPI bus as follows: + ** MOSI - pin 11 + ** MISO - pin 12 + ** CLK - pin 13 + ** CS - pin 4 + + created 22 December 2010 + + This example code is in the public domain. + + */ + +#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 = 4; + +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(10, 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."); + + // open the file. note that only one file can be open at a time, + // so you have to close this one before opening another. + File dataFile = SD.open("datalog.txt"); + + // if the file is available, write to it: + if (dataFile) { + while (dataFile.available()) { + Serial.write(dataFile.read()); + } + dataFile.close(); + } + // if the file isn't open, pop up an error: + else { + Serial.println("error opening datalog.txt"); + } +} + +void loop() +{ +} + |