Martin Smith
/
Data_Read_Write
Writing data to and from a USB stick
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main.cpp
00001 #include "mbed.h" 00002 #include "MSCFileSystem.h" 00003 00004 MSCFileSystem msc("usb"); // Mount flash drive under the name "msc" 00005 Serial pc(USBTX,USBRX); 00006 00007 int main() { 00008 unsigned char data[120*160]; // Test array of data 00009 00010 // Fill the data with values 00011 for (int i=0; i<120*160; i++) { 00012 data[i] = 0xAA; // Fill array with data 00013 } 00014 00015 // Create timers 00016 Timer Write_time, Read_time; 00017 Write_time.start(); 00018 00019 // Write to local file 00020 FILE *fp = fopen( "/usb/test.txt", "w"); 00021 for (int i=0; i<120*160; i++) { 00022 fprintf(fp, "%c",data[i]); 00023 } 00024 fclose(fp); 00025 00026 Write_time.stop(); 00027 pc.printf("\n\rTime taken so write array = %f seconds",Write_time.read()); 00028 00029 Read_time.start(); 00030 // Read from local file 00031 fopen("/usb/test.txt","r"); 00032 // Get data from file and load back into cam 00033 for (int i=0; i<120*160; i++) { 00034 data[i] = fgetc(fp); // Get the next character 00035 } 00036 fclose(fp); 00037 Read_time.stop(); 00038 pc.printf("\n\rTime taken to read array = %f seconds",Read_time.read()); 00039 }
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