Diff: main.cpp

Revision:

0:c58b0bf4e8ee

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sun Oct 25 02:11:56 2015 +0000
@@ -0,0 +1,109 @@
+/*
+ * Project:     Seeed Arch GPRS V2 Send SMS Hello World
+ * Author:      Joseph Radford
+ * Date:        25/10/2015
+ * Target:      Arch GPRS V2
+ * Peripherals: SIM Card
+ */
+
+#include "mbed.h"
+ 
+ // declare pins for comms with the SIM900
+#define TX_GSM P1_27
+#define RX_GSM P1_26
+
+// PINPWR to low on Q10 drives 3V3 to Q7, which drives Q5 to ground, which powers VBAT_900, with either VCC_BUCK or VCC_BAT
+#define PINPWR                  P1_2
+
+// PINONOFF controls PWRKEY on the SIM900, see manual for more info
+#define PINONOFF                P1_7
+
+// declare LEDs
+DigitalOut myled1(LED2); //left most LED if board is held as shown in Pinout diagram above
+DigitalOut myled2(LED3); //2nd from left
+DigitalOut myled3(LED4); //3rd from left
+DigitalOut myled4(LED1); //4th from left (right most)
+
+// create pins for controlling power to SIM900
+DigitalOut m_sim900_pwr(PINPWR);      
+DigitalOut m_sim900_on (PINONOFF);
+
+// create object for UART comms to SIM900
+Serial m_sim900_serial (TX_GSM, RX_GSM);      
+
+
+// flash each LED one at a time, and then leave all off
+void flashSequence()
+{
+    myled1 = 1;    myled2 = 0;    myled3 = 0;    myled4 = 0;
+    wait(0.5);
+    myled1 = 0;    myled2 = 1;
+    wait(0.5);
+                   myled2 = 0;    myled3 = 1;
+    wait(0.5);
+                                  myled3 = 0;    myled4 = 1;
+    wait(0.5);
+                                                 myled4 = 0;
+}
+
+int main()
+{
+    /* start up sequence, so we know we reached main */
+    flashSequence();
+    
+    // set up baud rate. Borrowed from http://tronixstuff.com/2014/01/08/tutorial-arduino-and-sim900-gsm-modules/
+    m_sim900_serial.baud(19200);
+    
+    
+    /* POWER ON SIM900 */
+    
+    // power on sequence borrowed from http://gronlier.fr/blog/2014/11/seeeduino-arch-gprs-v2/
+    // order of events specified by the SIM900 manual
+    m_sim900_pwr.write(1);     // turn power supply off
+    m_sim900_on.write(1);
+    wait(0.5);                 // wait to settle
+    
+    m_sim900_pwr.write(0);     // turn power supply on
+    m_sim900_on.write(0);      // from the ref: "drive the PWRKEY to a low level for 1 second then release."
+    wait(1);                   // wait for one second
+    
+    m_sim900_on.write(1);      // release power key
+    wait(20 /*0.5*/);          // wait to settle
+    
+    
+    
+    /* SEND A MESSAGE */
+        
+    // the following sequence and messages are borrowed from http://tronixstuff.com/2014/01/08/tutorial-arduino-and-sim900-gsm-modules/
+    // Set SMS mode 
+    m_sim900_serial.printf("AT+CMGF=1\r\n");                           // AT command to send SMS message
+    myled1 = 1;
+    wait(0.1);
+    
+    // Send phone number
+    m_sim900_serial.printf("AT + CMGS = \"+61123456789\"\r\n");        // recipient's mobile number, in international format
+    myled2 = 1;
+    wait(0.1);
+        
+    // Send text   
+    m_sim900_serial.printf("Hello, world. This is a text message from an Arch GPRS V2.\r\n");        // message to send
+    myled3 = 1;
+    wait(0.1);    
+    
+    // End message  
+    m_sim900_serial.putc((char)26);                       // End AT command with a ^Z, ASCII code 26
+    m_sim900_serial.printf("\r\n");          
+    myled4 = 1;
+    wait(0.1);
+    
+    // do nothing for a bit     
+    wait(5);
+        
+    // flash to signifty we are done
+    flashSequence();
+    
+    // hang forever
+    while(1);    
+}
+
+