Diff: main.cpp

Revision:

17:9a467f9a0579

Parent:

14:4c4094890fde

Child:

18:b64938c813dc

--- a/main.cpp	Tue Oct 04 23:57:03 2016 +0000
+++ b/main.cpp	Thu Oct 06 17:11:37 2016 +0000
@@ -12,24 +12,46 @@
 
 void turnOff()
 {
+    // Write the power down command to the PMIC
     max14720.shutdown();
 }
 
 int main()
 {
     int result;
+
+    // Assign turnOff function to falling edge of button
     button.fall(&turnOff);
+
+    // Turn LED signal on to make buck-boost output visible
     led = 0;
+
+    // Override the default value of boostEn to BOOST_ENABLED
     max14720.boostEn = MAX14720::BOOST_ENABLED;
+    // Note that writing the local value does directly affect the part
+    // The buck-boost regulator will remain off until init is called
+
+    // Call init to apply all settings to the PMIC
     result = max14720.init();
     if (result == MAX14720_ERROR) printf("Error initializing MAX14720");
+
+    // Wait 1 second to see the buck-boost regulator turn on
     wait(1);
+
     while(1) {
+        // Turn off the buck-boost regulators
         max14720.boostSetMode(MAX14720::BOOST_DISABLED);
-        max14720.boostEn = MAX14720::BOOST_ENABLED;
+        wait(0.5);
+
+        // Change the voltage of the buck-boost regulator and enable it
+        max14720.boostSetVoltage(2500);
+        max14720.boostSetMode(MAX14720::BOOST_ENABLED);
         wait(0.5);
-        max14720.boostSetVoltage(2500);
-        wait(0.5);
+
+        // Change the voltage of the buck-boost regulator
+        // Note that the MAX14720 cannot change the buck-boost voltage while  
+        // it is enabled so if boostEn is set to BOOST_ENABLED, this
+        // function will disable it, change the voltage, and re-enable it.
         max14720.boostSetVoltage(5000);
         wait(0.5);
     }