init

serial logger.ino

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+/*
+A small arduino program to log data from the UART port 
+to an SD card very quickly. Works at 115200 baud.
+
+
+Files on the SD card are named LOG00000.TXT, LOG00001.TXT, etc
+Each file is always 512,000 bytes, and the parts that have not been written to yet are all 0's
+
+You can change the arduino's internal serial buffer at C:\Program Files (x86)\Arduino\hardware\arduino\cores\arduino\HardwareSerial.cpp
+by changing the line "#define SERIAL_BUFFER_SIZE 64"
+I had it set to 500
+
+
+Adopted from the RawWrite.ino example found here:
+https://github.com/greiman/FreeRTOS-Arduino/blob/master/libraries/SdFat/examples/RawWrite/RawWrite.ino
+
+Also used code from OpenLog
+https://github.com/sparkfun/OpenLog
+*/
+
+#include <SdFat.h>
+#include <SdFatUtil.h>
+
+// SD chip select pin
+#define chipSelect SS
+
+// number of blocks in the contiguous file
+const uint32_t BLOCK_COUNT = 1000UL;
+
+//make another file if the one fills up
+uint32_t currBlock = 0;
+
+// file system
+SdFat sd;
+
+// test file
+SdFile file;
+
+// file extent
+uint32_t bgnBlock, endBlock;
+
+// Serial output stream
+ArduinoOutStream cout(Serial);
+//------------------------------------------------------------------------------
+// store error strings in flash to save RAM
+#define error(s) sd.errorHalt_P(PSTR(s))
+//------------------------------------------------------------------------------
+
+
+#define printn Serial.print
+#define printf(...) Serial.print(F(__VA_ARGS__))
+
+
+unsigned int bufferIndex;
+
+uint8_t* pCache;
+
+
+void makeFile(void)
+{
+
+    //Search for next available log spot
+    char new_file_name[] = "LOG00000.TXT";
+    int new_file_number=0;
+    while(1)
+    {
+        new_file_number++;
+
+        //There is a max of 65534 logs
+        if(new_file_number > 65533) 
+        {
+            printf(("!Too many logs:2!"));
+            return; //Bail!
+        }
+
+        //Splice the new file number into this file name
+        sprintf(new_file_name, "LOG%05d.TXT", new_file_number); 
+
+        //Try to open file, if fail (file doesn't exist), then break
+        if (file.open(new_file_name, O_CREAT | O_EXCL | O_WRITE)) break;
+    }
+
+    //Close the new file that was just opened
+    file.close(); 
+
+    // delete existing file that was just created, so it can be recreated as continuous
+    sd.remove(new_file_name);
+
+
+    // create a contiguous file
+    if (!file.createContiguous(sd.vwd(), new_file_name, 512UL*BLOCK_COUNT)) {
+        error("createContiguous failed");
+    }
+    // get the location of the file's blocks
+    if (!file.contiguousRange(&bgnBlock, &endBlock)) {
+        error("contiguousRange failed");
+    }
+    //*********************NOTE**************************************
+    // NO SdFile calls are allowed while cache is used for raw writes
+    //***************************************************************
+
+    // clear the cache and use it as a 512 byte buffer
+    pCache = (uint8_t*)sd.vol()->cacheClear();
+
+
+    // tell card to setup for multiple block write with pre-erase
+    if (!sd.card()->erase(bgnBlock, endBlock)) error("card.erase failed");
+    if (!sd.card()->writeStart(bgnBlock, BLOCK_COUNT)) {
+        error("writeStart failed");
+    }
+
+    printf("begin:");
+    printn(bgnBlock);
+    printf("\n");
+    printf("end:");
+    printn(endBlock);
+    printf("\n");
+}
+
+
+void setup(void) {
+    Serial.begin(115200);
+    while (!Serial) {}  // wait for Leonardo
+
+
+    cout << pstr("Free RAM: ") << FreeRam() << endl;
+
+    // initialize the SD card at SPI_FULL_SPEED for best performance.
+    // try SPI_HALF_SPEED if bus errors occur.
+    if (!sd.begin(chipSelect, SPI_FULL_SPEED)) sd.initErrorHalt();
+
+    makeFile();
+
+}
+
+char chr;
+
+//------------------------------------------------------------------------------
+void loop(void) {
+
+
+    // write data
+    while (Serial.available())
+    {
+
+        //read the data and record it in the buffer
+        chr=Serial.read();
+
+        pCache[bufferIndex]=chr;
+        bufferIndex++;
+
+
+        //flush whenever the the buffer fills up, or when an 18 is recieved
+        if (bufferIndex==511 || chr==18)
+        {
+
+            signed int t=millis();
+
+            // write a 512 byte block
+            if (!sd.card()->writeData(pCache)) 
+            {
+                error("writeData failed");
+            }
+
+
+            //log some info
+            printf("flushing took ");
+            printn((signed)millis()-t);
+            printf(" ms\n");
+            printn((char)18);
+            if(chr==18){
+                printf("chr\n");
+            }
+            if (bufferIndex==511)
+            {
+                printf("buf\n");
+            }
+
+            //reset the count
+            bufferIndex=0;
+            currBlock++;
+            if(currBlock==BLOCK_COUNT){
+
+              if (!sd.card()->writeStop()) error("writeStop failed");
+
+              file.close();
+              makeFile();
+
+              currBlock=0;
+
+            }
+        }
+    }
+}