Diff: ButtonAService.h

Revision:

2:4871b5ad7938

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ButtonAService.h	Mon Sep 30 10:38:33 2019 +0000
@@ -0,0 +1,51 @@
+#ifndef __BUTTONA_SERVICE_H__
+#define __BUTTONA_SERVICE_H__
+// Button A is on P0 bit 17 
+volatile uint32_t * P0OUT = (uint32_t *)0x50000504;
+volatile uint32_t * P0DIR = (uint32_t *)0x50000514;
+volatile uint32_t * P0IN  = (uint32_t *)0x50000510;
+volatile uint32_t * P0CONF  = (uint32_t *)(0x50000700);
+int8_t initialValue=0;
+class ButtonAService {
+public:
+    const static uint16_t BUTTONA_SERVICE_UUID              = 0x1eee;
+    const static uint16_t BUTTONA_STATE_CHARACTERISTIC_UUID = 0x2019;
+
+    ButtonAService(BLEDevice &_ble) :
+        ble(_ble), ButtonState(BUTTONA_STATE_CHARACTERISTIC_UUID,&initialValue,GattCharacteristic::BLE_GATT_CHAR_PROPERTIES_NOTIFY)
+    {
+        GattCharacteristic *charTable[] = {&ButtonState};
+        GattService         btnService(BUTTONA_SERVICE_UUID, charTable, sizeof(charTable) / sizeof(GattCharacteristic *));
+        ble.addService(btnService);
+        P0CONF[17] = 0;  // On power up, input buffer is not connected so must do this
+        PreviousButtonState = -1;
+    }
+
+    GattAttribute::Handle_t getValueHandle() const {
+        return ButtonState.getValueHandle();
+    }
+    void poll() {
+        uint8_t newValue = GetButtonAState();
+        if (newValue != PreviousButtonState)
+        {   
+            // only send an update if the button state has changed (reduces traffic)
+            ble.gattServer().write(this->getValueHandle(), (uint8_t *)&newValue, sizeof(uint8_t));        
+            PreviousButtonState = newValue;
+        }
+    }
+    uint8_t GetButtonAState()
+    {
+        if ((*P0IN & (1 << 17))==0)    
+            return 1;
+        else
+            return 0;
+    }
+
+private:
+    BLEDevice  &ble;
+    ReadOnlyGattCharacteristic<int8_t>  ButtonState;
+    uint8_t PreviousButtonState;
+    
+};
+
+#endif