Martin Smith
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Data_Read_Write
Writing data to and from a USB stick
Diff: main.cpp
- Revision:
- 0:5934350323b2
diff -r 000000000000 -r 5934350323b2 main.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/main.cpp Sun Nov 06 15:45:12 2011 +0000 @@ -0,0 +1,39 @@ +#include "mbed.h" +#include "MSCFileSystem.h" + +MSCFileSystem msc("usb"); // Mount flash drive under the name "msc" +Serial pc(USBTX,USBRX); + +int main() { + unsigned char data[120*160]; // Test array of data + + // Fill the data with values + for (int i=0; i<120*160; i++) { + data[i] = 0xAA; // Fill array with data + } + + // Create timers + Timer Write_time, Read_time; + Write_time.start(); + + // Write to local file + FILE *fp = fopen( "/usb/test.txt", "w"); + for (int i=0; i<120*160; i++) { + fprintf(fp, "%c",data[i]); + } + fclose(fp); + + Write_time.stop(); + pc.printf("\n\rTime taken so write array = %f seconds",Write_time.read()); + + Read_time.start(); + // Read from local file + fopen("/usb/test.txt","r"); + // Get data from file and load back into cam + for (int i=0; i<120*160; i++) { + data[i] = fgetc(fp); // Get the next character + } + fclose(fp); + Read_time.stop(); + pc.printf("\n\rTime taken to read array = %f seconds",Read_time.read()); +} \ No newline at end of file