Diff: main.cpp

Revision:

0:d40fd50424e3

diff -r 000000000000 -r d40fd50424e3 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Wed Oct 13 09:37:50 2010 +0000
@@ -0,0 +1,91 @@
+
+// Read from I2C slave at address 0x62
+
+#include "mbed.h"
+
+I2C i2c(p28, p27);
+Serial pc(USBTX, USBRX);
+DigitalOut myled(LED2);
+LocalFileSystem local("local");             // Create the local filesystem under the name "local"
+
+
+int main()
+{
+    unsigned int loop = 1;
+    unsigned loopCount = 1;
+    int address = 0x90;
+    char RXdata[2];
+    char TXdata[2];
+    float temperature = 0;
+    time_t seconds = 0;
+    
+    //Hello splash screen
+    printf("\r\n\nmbeb Temperature logger V0.1\r\nBy Paul J clarke MIET\r\n13th Oct 2010\r\n\n");
+    
+    //clear serial buffer
+    while( pc.readable() );
+    
+    //Configure sensor at 0.0625'C steps
+    TXdata[0] = 0x01;
+    TXdata[1] = 0x60;
+    i2c.write(address, TXdata, 2);
+    //Set dat for reading temperature
+    TXdata[0] = 0x00;
+    myled = 0;
+    
+    // Opens the root directory of the local file system
+    printf("Files on mbed\r\n");
+    DIR *d = opendir("/local");
+    struct dirent *p;
+    while((p = readdir(d)) != NULL)
+    {                                         // Print the names of the files in the local file system
+      printf("%s\n\r", p->d_name);            // to stdout (USB Serial).
+    }
+    closedir(d);
+    printf("\n");
+    
+    // Removes the file "out.txt" from the local file system
+    remove("/local/log.csv");
+    // Open "log.csv" on the local file system for writing
+    FILE *fp = fopen("/local/log.csv", "w");
+   
+    //reset time to zero
+    set_time(0);
+   
+    //Send headers to csv file
+    fprintf(fp, "Time_Seconds,Temperature_C\r");
+   
+    //main loop
+    while(loop)
+    {
+        //toggle LED to show we are running
+        myled = !myled;
+        //set I2C device to point at temperature registor
+        i2c.write(address, TXdata, 1);
+        //read two bytes of raw data back
+        i2c.read(address, RXdata, 2);
+        //generate floating point number from raw data recived
+        temperature = (((float)RXdata[1]) / 256) + RXdata[0];
+        //stream temperature to USB serial port
+        printf("Temperature = %.4f'C     Data Point = %d     \r", temperature, loopCount);
+        //get time in seconds
+        seconds = time(NULL);
+        //and save to log file
+        fprintf(fp, "%d,%.4f\n", seconds, temperature);
+        //wait 250ms - time for ADC in temp sensor to re calculate new value
+        wait(1);
+     
+        //inc loop counter
+        loopCount++;
+        
+        if( pc.readable() || loopCount==1200 ) //1200 = 5 min's of loggin time
+        {
+            loop = 0;
+        }
+    }
+    printf("\r\n\n Finished...\r\nTotal data points = %d\r\n", (loopCount-1));
+    fclose(fp);
+
+    while(1); //HALT
+    
+}