Revision 0:2f1a2ad434d7, committed 2009-09-30
- Comitter:
- prf
- Date:
- Wed Sep 30 09:32:22 2009 +0000
- Commit message:
Changed in this revision
diff -r 000000000000 -r 2f1a2ad434d7 main.cpp
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp Wed Sep 30 09:32:22 2009 +0000
@@ -0,0 +1,135 @@
+// GPS synchronised data logger
+// Uses the $GPRMC string for time and date
+// synchronisation
+// Code derived from Arduino GPS examples
+// and the MBED GPS library
+// http://www.arduino.cc/
+// Thanks Lady Ada and others!
+
+#include "mbed.h"
+// Commands for Globalsat EM-406A GPS
+// to turn on or off data strings
+#define RMC_ON "$PSRF103,4,0,1,1*21\r\n"
+#define RMC_OFF "$PSRF103,4,0,0,1*20\r\n"
+#define GGA_ON "$PSRF103,0,0,1,1*25\r\n"
+#define GGA_OFF "$PSRF103,0,0,0,1*24\r\n"
+#define GSA_ON "$PSRF103,2,0,1,1*27\r\n"
+#define GSA_OFF "$PSRF103,2,0,0,1*26\r\n"
+#define GSV_ON "$PSRF103,3,0,1,1*26\r\n"
+#define GSV_OFF "$PSRF103,3,0,0,1*27\r\n"
+#define WAAS_ON "$PSRF151,1*3F\r\n"
+#define WAAS_OFF "$PSRF151,0*3E\r\n"
+
+// Set up serial ports and LEDs
+// MBED USB port used for console debug messages
+// EM-406A GPS on Pin9 and Pin10
+Serial pc(USBTX, USBRX); // tx, rx - Default 9600 baud
+Serial gps(p9, p10); // tx, rx - 4800 baud required
+DigitalOut led1(LED1); // Seconds LED
+DigitalOut led4(LED4); // Data sent LED
+
+//char buffidx;
+char msg[256]; // GPS data buffer
+char status; // GPS status 'V' = Not locked; 'A' = Locked
+char *parseptr; // Pointer for parsing GPS message
+char time_buff[7] = "000000";
+char date_buff[7] = "000000";
+char sens_buff[7] = "123456";
+
+// Switch off all but $GPRMC string
+void setgps() {
+ gps.printf(RMC_ON);
+ gps.printf(GGA_OFF);
+ gps.printf(GSA_OFF);
+ gps.printf(GSV_OFF);
+ gps.printf(WAAS_OFF);
+ return;
+}
+// Get line of data from GPS
+void getline() {
+ while (gps.getc() != '$'); // Wait for start of line
+ for (int i=0; i<256; i++) {
+ msg[i] = gps.getc();
+// pc.putc(msg[i]);
+ if (msg[i] == '\r') {
+ msg[i] = 0;
+ return;
+ }
+ }
+}
+// Flash LED 1
+void flashled1(void) {
+ led1 = 1;
+ wait(0.05);
+ led1 = 0;
+ wait(0.05);
+}
+// Flash LED4
+void flashled4(void) {
+ led4 = 1;
+ wait(0.1);
+ led4 = 0;
+ wait(0.1);
+}
+void read_sensor() {
+// Insert code here to read sensor
+// and store data in sens_buff[]
+}
+void send_data() {
+// Insert code to send data
+ pc.printf(sens_buff);
+ pc.printf("\r\n");
+}
+
+int main(void) {
+ gps.baud(4800); // NB GPS baud rate 4800
+ pc.printf("\n\rGPS Logger Running!...\n\r");
+ setgps();
+ while (1) {
+ getline();
+ if (strncmp(msg, "GPRMC",5) == 0) {
+ // Put the time into the time array
+ parseptr = msg+6;
+ for (int i = 0; i < 6; i++) {
+ time_buff[i] = parseptr[i];
+ }
+ // Skip through commas in the data string
+ // Firstly to get to the status flag and
+ // then to pick up the date
+ parseptr = strchr(parseptr, ',')+1;
+ status = parseptr[0];
+ parseptr = strchr(parseptr, ',')+1;
+ parseptr = strchr(parseptr, ',')+1;
+ parseptr = strchr(parseptr, ',')+1;
+ parseptr = strchr(parseptr, ',')+1;
+ parseptr = strchr(parseptr, ',')+1;
+ parseptr = strchr(parseptr, ',')+1;
+ parseptr = strchr(parseptr, ',')+1;
+ // Put the date into the date array
+ for (int i = 0; i < 6; i++) {
+ date_buff[i] = parseptr[i];
+ }
+ // Every second output time, date and lock status
+ // to the console and flash LED1
+ pc.printf(time_buff);
+ pc.printf(",");
+ pc.printf(date_buff);
+ pc.printf(",");
+ pc.putc(status);
+ pc.printf("\r\n");
+ flashled1();
+ // Take a sensor reading every minute
+ // ie is the time hh:mm:00
+ if (time_buff[4] == 0x30 && time_buff[5] == 0x30) {
+ pc.printf("\r\nSensor Reading!\r\n");
+ read_sensor();
+ pc.printf("Sending: ");
+ send_data();
+ pc.printf("\r\n");
+ flashled4();
+
+ }
+ }
+ }
+}
+
diff -r 000000000000 -r 2f1a2ad434d7 mbed.bld
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld Wed Sep 30 09:32:22 2009 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/a0336ede94ce
Peter Foden