Martin Smith / Mbed 2 deprecated Data_Read_Write

Writing data to and from a USB stick

Dependencies:   mbed

main.cpp@0:5934350323b2, 2011-11-06 (annotated)

Committer:
ms523
Date:
Sun Nov 06 15:45:12 2011 +0000
Revision:
0:5934350323b2
Working with a USB stick

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ms523 0:5934350323b2 1 #include "mbed.h"
ms523 0:5934350323b2 2 #include "MSCFileSystem.h"
ms523 0:5934350323b2 3
ms523 0:5934350323b2 4 MSCFileSystem msc("usb"); // Mount flash drive under the name "msc"
ms523 0:5934350323b2 5 Serial pc(USBTX,USBRX);
ms523 0:5934350323b2 6
ms523 0:5934350323b2 7 int main() {
ms523 0:5934350323b2 8 unsigned char data[120*160]; // Test array of data
ms523 0:5934350323b2 9
ms523 0:5934350323b2 10 // Fill the data with values
ms523 0:5934350323b2 11 for (int i=0; i<120*160; i++) {
ms523 0:5934350323b2 12 data[i] = 0xAA; // Fill array with data
ms523 0:5934350323b2 13 }
ms523 0:5934350323b2 14
ms523 0:5934350323b2 15 // Create timers
ms523 0:5934350323b2 16 Timer Write_time, Read_time;
ms523 0:5934350323b2 17 Write_time.start();
ms523 0:5934350323b2 18
ms523 0:5934350323b2 19 // Write to local file
ms523 0:5934350323b2 20 FILE *fp = fopen( "/usb/test.txt", "w");
ms523 0:5934350323b2 21 for (int i=0; i<120*160; i++) {
ms523 0:5934350323b2 22 fprintf(fp, "%c",data[i]);
ms523 0:5934350323b2 23 }
ms523 0:5934350323b2 24 fclose(fp);
ms523 0:5934350323b2 25
ms523 0:5934350323b2 26 Write_time.stop();
ms523 0:5934350323b2 27 pc.printf("\n\rTime taken so write array = %f seconds",Write_time.read());
ms523 0:5934350323b2 28
ms523 0:5934350323b2 29 Read_time.start();
ms523 0:5934350323b2 30 // Read from local file
ms523 0:5934350323b2 31 fopen("/usb/test.txt","r");
ms523 0:5934350323b2 32 // Get data from file and load back into cam
ms523 0:5934350323b2 33 for (int i=0; i<120*160; i++) {
ms523 0:5934350323b2 34 data[i] = fgetc(fp); // Get the next character
ms523 0:5934350323b2 35 }
ms523 0:5934350323b2 36 fclose(fp);
ms523 0:5934350323b2 37 Read_time.stop();
ms523 0:5934350323b2 38 pc.printf("\n\rTime taken to read array = %f seconds",Read_time.read());
ms523 0:5934350323b2 39 }