Add CSV-based datalogging.

TODO

@@ -1,5 +1,5 @@
 Non-exclusive TODO:
- 
+
  * Test it out on an actual vehicle!
  * Additional data streams (patches welcome!)
  * Better flesh out dashboard
@@ -7,6 +7,5 @@ Non-exclusive TODO:
    * better use of color
    * Additional data
  * GPS support
- * Data logging
  * ???
  * Profit

aldl.c

@@ -29,6 +29,7 @@
 
 #include <stdio.h>
 #include <stdint.h>
+#include <time.h>
 #include <unistd.h>
 
 #include "aldl.h"
@@ -43,10 +44,43 @@ static uint8_t data[MAX_STREAM_WORDS];
 
 int gotsync = 0;
 
+static FILE *datalog_handle;
+
 struct stream_common decoded = { 0 };
 
 void (*aldl_callback)(uint8_t *data, int datalen) = NULL;
 
+
+/* Datalogging */
+void datalog_init(char *fname)
+{
+   datalog_handle = fopen(fname, "a");
+   if (!datalog_handle)
+       perror("Can't open datalog file!\n");
+   fprintf(datalog_handle, "# New session\n");
+}
+
+void datalog_close(void)
+{
+    if (datalog_handle)
+	fclose(datalog_handle);
+}
+
+static void aldl_datalog(uint8_t *data, int datalen)
+{
+    int i;
+
+    if (!datalog_handle) return;
+
+    fprintf(datalog_handle, "%ld", time(NULL));
+
+    for (i = 0 ; i < datalen ; i++) {
+	    fprintf(datalog_handle, ",%02x", *data++);
+    }
+    fprintf(datalog_handle, "\n");
+}
+
+/* ISR */
 void isrfn(void)
 {
   int val;
@@ -67,6 +101,8 @@ void isrfn(void)
     /* New sync word, we've finished a sequence */
     if (aldl_callback)
 	aldl_callback(data, datalen);
+    if (datalog_handle)
+        aldl_datalog(data, datalen);
     bits = 0;
     datalen = 0;
   } else if (++bits == 9) {

aldl.h

@@ -38,6 +38,9 @@ extern void (*aldl_callback)(uint8_t *data, int datalen);
 int init_dash(void);
 int render_dash(void);
 
+void datalog_init(char *fname);
+void datalog_close(void);
+
 /* Decoded data stream */
 struct stream_common {
 	uint16_t heartbeat;

aldl_pi.c

@@ -38,6 +38,8 @@
 /* What pin? */
 #define ALDL_PIN_IN 5
 
+static char *datalog_fname = "DATALOG.csv";
+
 int readbit(void)
 {
    return digitalRead(ALDL_PIN_IN);
@@ -47,6 +49,7 @@ void delayfn(int ms)
    delay(1);
 }
 
+/* Main */
 int main (int argc, char **argv)
 {
   /* Set up RPi GPIO */
@@ -57,7 +60,7 @@ int main (int argc, char **argv)
 
   wiringPiISR (ALDL_PIN_IN, INT_EDGE_FALLING, &isrfn);
 
-  aldl_callback = aldl_a179_callback;
+  datalog_init(datalog_fname);
 
   if (init_dash())
 	  return -1;
@@ -67,5 +70,7 @@ int main (int argc, char **argv)
 	sleep(1);
   }
 
+  datalog_close();
+
   return 0;
 }