Revision 0:9dfb24edf079, committed 2019-03-19

Comitter:

jschilling22

Date:

Tue Mar 19 16:45:48 2019 +0000

Commit message:

logging

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/SDFileSystem.lib	Tue Mar 19 16:45:48 2019 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/teams/Whitworth-EN173-Resources/code/SDFileSystem/#ee903cb278a6

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Mar 19 16:45:48 2019 +0000
@@ -0,0 +1,62 @@
+/* Program demonstrating data logging to SD card 
+    Temperature is read in from an TMP36 
+    The time since program start and the voltage 
+    are written to a tab-delimited data file. 
+    TMP36 pins: left = power, middle = output (p18), right = ground 
+    SD pins: DI = p5, DO = p6, SCK = p7, CS = p8  
+*/ 
+#include "mbed.h" 
+#include "SDFileSystem.h" 
+
+AnalogIn tmp36(p18); 
+Serial pc(USBTX,USBRX); 
+SDFileSystem fs(p5, p6, p7, p8, "fs"); 
+Timer t; 
+Ticker sampleTime; 
+DigitalOut doneLED(LED1); 
+bool timeToRead; 
+
+void triggerCollection() { 
+    timeToRead = true;  // flag to collect data 
+} 
+
+int main() { 
+
+    float voltage, temperature; 
+    // Mount the filesystem 
+    bool mountFailure = fs.mount(); 
+    if (mountFailure != 0) { 
+        pc.printf("Failed to mount the SD card.\r\n"); 
+        return -1;  // ends program with error status 
+    }
+
+    FILE* fp = fopen("/fs/log.txt","w"); 
+    if (fp == NULL) { 
+        pc.printf("Failed to open the file.\r\n"); 
+        fs.unmount(); 
+        return -1; 
+    }    
+
+    // Write a header row 
+    fprintf(fp, "Time (s) \t Temperature (deg C)\r\n"); 
+
+    // Start the timer and ticker 
+    t.start(); 
+    sampleTime.attach(&triggerCollection, 0.5);  // write data every 0.5 s 
+    timeToRead = true; // collect data at t = 0 
+
+    while (t.read()<20) { 
+        if (timeToRead) { 
+            timeToRead = false;  // reset data collection flag 
+            voltage = 3.3*tmp36.read(); 
+            temperature = (voltage-0.5)/0.01; 
+            fprintf(fp,"%.2f \t %.2f\r\n", t.read(),temperature); 
+        } 
+    } 
+    
+    // Close the file and unmount the file system so the SD card is happy 
+    fclose(fp); 
+    fs.unmount(); 
+    // Turn on LED to let user know it is safe to remove the SD card 
+    doneLED = 1; 
+} 
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Mar 19 16:45:48 2019 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/3a7713b1edbc
\ No newline at end of file