SDCard.cpp

00001 #include "mbed.h"
00002 #include "Sampling.h"
00003 #include "SDCard.h"
00004 #include "SDBlockDevice.h"
00005 #include "FATFileSystem.h"
00006 #include "LCD.h"
00007 
00008 
00009 //Hardware
00010 DigitalOut SDCardStatusLED(LED3);
00011 
00012 //Variables
00013 bool SDCardPresent;
00014 bool SDCardMounted;
00015 unsigned short SDinternalIndex;
00016 
00017 FILE* fp; //File pointer type
00018 SDCardStates SDCurrentState;    //Create state machine state
00019 
00020 Timeout antiBounce;
00021 Thread SDCardThread;
00022 FATFileSystem fs;
00023 
00024 
00025 void SDCardInit(void)
00026 {
00027     SDCardThread.start(&SDCardCode);   //Start thread running
00028     SD_WP.rise(&SDCardRemovedISR);     //SD removed
00029     SD_WP.fall(&SDCardInsertedISR);    //SD inserted
00030     UserButton.fall(&SDCardButtonISR); //Button released
00031 
00032     if (SD_WP == 1) {               //Checks if card is inserted on power up and sets states
00033         SDCardPresent = false;
00034         SDCurrentState = REMOVED;
00035         SDCardMounted = false;
00036     } else {
00037         SDCardPresent = true;
00038         SDCurrentState = INSERTED;
00039         SDCardMounted = false;
00040     }
00041 }
00042 
00043 
00044 //-----------------------------------------------------------------//
00045 //ISRs
00046 void SDCardRemovedISR(void)
00047 {
00048     SDCardPresent = false;
00049     SDCurrentState = REMOVED;
00050     antiBounce.attach(&antiBounceISR,1);
00051 }
00052 
00053 void SDCardInsertedISR(void)
00054 {
00055     SDCardPresent = true;
00056     SDCurrentState = INSERTED;
00057     antiBounce.attach(&antiBounceISR,1);
00058 
00059 }
00060 
00061 void SDCardButtonISR(void)
00062 {
00063     SDCurrentState = DISMOUNTREQUEST;
00064     antiBounce.attach(&antiBounceISR,1);
00065 }
00066 //-----------------------------------------------------------------//
00067 
00068 void antiBounceISR(void)
00069 {
00070     SDCardThread.signal_set(1);
00071 }
00072 
00073 
00074 void SDCardCode(void)
00075 {
00076     while(true) {
00077         Thread::signal_wait(1);    //Wait untill signal set
00078 
00079         if (SDCurrentState == REMOVED) {
00080 
00081             if (SDCardMounted) {
00082                 //print error message file currupt
00083                 lcd.SendMessage("SD CARD REMOVED!  FILE CORRUPT",true);
00084                 SDCardMounted = 0;
00085             }
00086             LogEvent(Log_SDRemoved);
00087             SDCardStatusLED = 0;    //Set LEDs
00088             GreenLED = 0;
00089 
00090 
00091 
00092         } else if (SDCurrentState == INSERTED) {
00093             LogEvent(Log_SDInserted);
00094             SDCardStatusLED = 0;    //Set LEDs
00095             GreenLED = 0;
00096 
00097             if ( sd.init() != 0) { //Initalises the SDCard and checks if it succeeded
00098                 //SDInit failed. Reinsert the SDCard
00099                 lcd.SendMessage("REINSERT SDCARD",true);
00100                 LogEvent(Log_SDInitFail);
00101 
00102             } else {
00103 
00104                 //Create a filing system for SD Card
00105                 FATFileSystem fs("sd", &sd);
00106 
00107                 //Open to WRITE
00108                 fp = fopen("/sd/samples.csv","w");
00109 
00110 
00111                 if (fp == NULL) {
00112                     //error
00113                     lcd.SendMessage("CANNOT OPEN FILE/sd/samples.csv",true);
00114                     LogEvent(Log_SDFileOpenFail);
00115 
00116                 } else {
00117                     SDCardMounted = true;   //SD card is now mounted
00118 
00119                     Sampling(false);    //Stop sampling
00120                     SDinternalIndex = currentIndex; //SDinternalIndex for incrementing out data
00121                     TakeKeys(true);     //Take keys
00122 
00123                     fprintf(fp,"Date,Time,Temperature,Pressure,Light\n");
00124                     for (short i = 0; i < BUFFERSIZE; i++) { //For loop of length buffersize
00125                         tm T = ReturnDateTimeStruct(timeReadings[SDinternalIndex]);
00126                         //SDinternalIndex was set as newest. We will now decrement to display oldest to newest
00127                         fprintf(fp," %4d/%2d/%2d,%2d:%2d:%2d,%2.2f,%2.2f,%2.2f\n",T.tm_year,T.tm_mon,T.tm_mday,T.tm_hour,T.tm_min,T.tm_sec,tempReadings[SDinternalIndex],presReadings[SDinternalIndex],LDRReadings[SDinternalIndex]);
00128                         SDinternalIndex = IndexDecrement(SDinternalIndex); //Decrement internal index
00129                     }
00130                 }
00131                 TakeKeys(false); //Return keys
00132                 Sampling(true);  //Start sampling
00133 
00134 
00135                 fclose(fp);         //Close file
00136                 SDCardStatusLED = 1;//Set light to indicate SD card file transfer complete.
00137             }
00138 
00139         } else if (SDCurrentState == DISMOUNTREQUEST) {
00140 
00141             if (SDCardMounted) {
00142                 sd.deinit();    //De initalise SD card
00143                 SDCardMounted = false;  //Card now not mounted
00144                 lcd.SendMessage("REMOVE SD CARD",true); //SD card can be removed
00145                 GreenLED = 1;   //Indication LED
00146                 LogEvent(Log_SDDeInit);
00147             } else {
00148                 lcd.SendMessage("NO SD CARD  TO REMOVE",true);
00149                 LogEvent(Log_SDDismountFail);
00150             }
00151 
00152         }
00153     }
00154 }
00155 
00156 
00157