Diff: main.cpp

Revision:

14:0c353e212296

Parent:

12:7c94ec5069dc

Child:

16:17c5916f2d12

--- a/main.cpp	Tue Jul 12 21:58:17 2016 +0000
+++ b/main.cpp	Wed Jul 13 00:39:08 2016 +0000
@@ -47,6 +47,8 @@
 DigitalOut  mdm_power_on(PTB9);                 // 0 = turn modem on, 1 = turn modem off (should be held high for >5 seconds to cycle modem)
 DigitalOut  mdm_wakeup_in(PTC2);                // 0 = let modem sleep, 1 = keep modem awake -- Note: pulled high on shield
 
+DigitalOut  mdm_reset(PTC12);                   // active high      
+
 DigitalOut  shield_3v3_1v8_sig_trans_ena(PTC4); // 0 = disabled (all signals high impedence, 1 = translation active
 DigitalOut  mdm_uart1_cts(PTD0);
 
@@ -132,9 +134,23 @@
 }
 
 int mdm_init(void) {
-    // disable signal level translator
+    // disable signal level translator (necessary
+    // for the modem to boot properly)
     shield_3v3_1v8_sig_trans_ena = 0;
 
+    // Hard reset the modem (doesn't go through
+    // the signal level translator)
+    mdm_reset = 1;
+    
+   // wait a moment for the modem to react
+    wait_ms(10);
+    
+    // Let modem boot
+    mdm_reset = 0;
+    
+    // wait a moment for the modem to react
+    wait(1.0);
+    
     // power modem on //off
     mdm_power_on = 0; //1;
     
@@ -151,6 +167,13 @@
 
     mdm_uart1_cts = 0;
     
+    // wait a moment for the modem to react to signal
+    // conditions while the level translator is disabled
+    // (sorry, don't have enough information to know
+    // what exactly the modem is doing with the current
+    // pin settings)
+    wait(1.0);
+
     // enable the signal level translator to start
     // modem reset process (modem will be powered down)
     shield_3v3_1v8_sig_trans_ena = 1;
@@ -163,7 +186,7 @@
         const char * rsp_lst[] = { ok_str, error_str, NULL };
         int rc = mdm_sendAtCmd("AT", rsp_lst, 500);
         if (rc == 0)
-            return timer.read();
+            return true; //timer.read();
         wait_ms(1000 - (timer.read_ms() % 1000));
         pc.printf("\r%d",timer.read_ms()/1000);
     }
@@ -332,11 +355,12 @@
 
     // Initialize the modem
     printf(GRN "Modem initializing... will take up to 60 seconds" DEF "\r\n");
-    i=mdm_init();
-    if (!i) {
-        pc.printf(RED "Modem initialization failed!" DEF "\n");
-        while (1);
-    }
+    do {
+        i=mdm_init();
+        if (!i) {
+            pc.printf(RED "Modem initialization failed!" DEF "\n");
+        }
+    } while (!i);
     
     //Software init
     software_init_mdm();