[ion] Implement method generate wake up event for USB plugging, battery

charging and power event

Change-Id: I10e12aa9c0ed6e9440d03c0a4b58cc66092522b3

ion/src/device/battery.cpp

@@ -48,13 +48,7 @@ namespace Battery {
 namespace Device {
 
 void init() {
-  /* Step 1 - Configure the GPIOs
-   * The BAT_CHRG pin is connected to the Li-Po charging IC. That pin uses an
-   * open-drain output. Open-drain output are either connected to ground or left
-   * floating. To interact with such an output, our input must therefore be
-   * pulled up. */
-  ChargingGPIO.MODER()->setMode(ChargingPin, GPIO::MODER::Mode::Input);
-  ChargingGPIO.PUPDR()->setPull(ChargingPin, GPIO::PUPDR::Pull::Up);
+  initGPIO();
 
   /* The BAT_SNS pin is connected to Vbat through a divider bridge. It therefore
    * has a voltage of Vbat/2. We'll measure this using ADC channel 0. */
@@ -70,12 +64,39 @@ void init() {
   ADC.SMPR()->setSamplingTime(ADCChannel, ADC::SMPR::SamplingTime::Cycles480); // Use the max sampling time
 }
 
+void initGPIO() {
+  /* Step 1 - Configure the GPIOs
+   * The BAT_CHRG pin is connected to the Li-Po charging IC. That pin uses an
+   * open-drain output. Open-drain output are either connected to ground or left
+   * floating. To interact with such an output, our input must therefore be
+   * pulled up. */
+  ChargingGPIO.MODER()->setMode(ChargingPin, GPIO::MODER::Mode::Input);
+  ChargingGPIO.PUPDR()->setPull(ChargingPin, GPIO::PUPDR::Pull::Up);
+}
+
 void shutdown() {
   // Disable the ADC
   ADC.CR2()->setADON(false);
   RCC.APB2ENR()->setADC1EN(false);
 }
 
+void generateWakeUpEventForChargingState() {
+  initGPIO();
+
+  /* Warning: pins with the same number in different groups cannot be set as
+   * source input for EXTI at the same time. Here, EXTICR1 register is filled
+   * between position 0-3 (charging pin = 0) with
+   * 0000 (ChargingGPIO = group A). */
+  SYSCFG.EXTICR1()->setEXTI(ChargingPin, ChargingGPIO);
+
+  EXTI.EMR()->set(ChargingPin, true);
+
+  /* We need to detect when the battery starts and stops charging. We set the
+   * wake up event on the falling and rising edge. */
+  EXTI.FTSR()->set(ChargingPin, true);
+  EXTI.RTSR()->set(ChargingPin, true);
+}
+
 }
 }
 }

ion/src/device/battery.h

@@ -17,6 +17,7 @@ void init();
 void shutdown();
 void initGPIO();
 void initADC();
+void generateWakeUpEventForChargingState();
 
 constexpr GPIO ChargingGPIO = GPIOA;
 constexpr uint8_t ChargingPin = 0;

ion/src/device/keyboard.cpp

@@ -117,18 +117,23 @@ void shutdown() {
   }
 }
 
-void generateWakeUpEventForKey(Key k) {
-  uint8_t rowPin = RowPins[rowForKey(k)];
+void generateWakeUpEventForPowerKey() {
+  Key key = Key::B2;
+  uint8_t rowPin = RowPins[rowForKey(key)];
   RowGPIO.MODER()->setMode(rowPin, GPIO::MODER::Mode::Output);
   RowGPIO.OTYPER()->setType(rowPin, GPIO::OTYPER::Type::OpenDrain);
   RowGPIO.ODR()->set(rowPin, 0);
 
-  uint8_t column = columnForKey(k);
+  uint8_t column = columnForKey(key);
   uint8_t columnPin = ColumnPins[column];
 
   ColumnGPIO.MODER()->setMode(columnPin, GPIO::MODER::Mode::Input);
   ColumnGPIO.PUPDR()->setPull(columnPin, GPIO::PUPDR::Pull::Up);
 
+  /* Warning: pins with the same number in different groups cannot be set as
+   * source input for EXTI at the same time. Here, EXTICR1 register is filled
+   * between position 4-7 (column pin = 1) with 0010 (ColumnGPIO = group C). */
+
   SYSCFG.EXTICR1()->setEXTI(columnPin, ColumnGPIO);
 
   EXTI.EMR()->set(columnPin, true);

ion/src/device/keyboard.h

@@ -45,7 +45,7 @@ inline uint8_t columnForKey(Key key) {
   return (int)key%numberOfColumns;
 }
 
-void generateWakeUpEventForKey(Key k);
+void generateWakeUpEventForPowerKey();
 
 }
 }

ion/src/device/power.cpp

@@ -12,7 +12,7 @@ void Ion::Power::suspend() {
   PWR.CR()->setFPDS(true); // Put the flash to sleep. Takes longer to wake up.
   CM4.SCR()->setSLEEPDEEP(true);
 
-  Keyboard::Device::generateWakeUpEventForKey(Ion::Keyboard::Key::B2);
+  Keyboard::Device::generateWakeUpEventForPowerKey();
 
   Device::shutdownClocks();
 

ion/src/device/usb.cpp

@@ -17,6 +17,10 @@ namespace USB {
 namespace Device {
 
 void init() {
+  initGPIO();
+}
+
+void initGPIO() {
   /* Configure the GPIO
    * The VBUS pin is connected to the USB VBUS port. To read if the USB is
    * plugged, the pin must be pulled down. */
@@ -29,6 +33,17 @@ void shutdown() {
   VbusPin.group().PUPDR()->setPull(VbusPin.pin(), GPIO::PUPDR::Pull::None);
 }
 
+void generateWakeUpEventForUSBPlug() {
+  initGPIO();
+  /* Warning: pins with the same number in different groups cannot be set as
+   * source input for EXTI at the same time. Here, EXTICR3 register is
+   * filled between position 4-7 (Vbus pin = 9) with 0000 (Vbus GPIO = group A). */
+  SYSCFG.EXTICR3()->setEXTI(VbusPin.pin(), VbusPin.group());
+
+  EXTI.EMR()->set(VbusPin.pin(), true);
+  EXTI.FTSR()->set(VbusPin.pin(), true);
+  EXTI.RTSR()->set(VbusPin.pin(), true);
+}
 }
 }
 }

ion/src/device/usb.h

@@ -13,7 +13,9 @@ namespace Device {
  */
 
 void init();
+void initGPIO();
 void shutdown();
+void generateWakeUpEventForUSBPlug();
 
 constexpr static GPIOPin VbusPin = GPIOPin(GPIOA, 9);