Arduino BLE new library

1. Add new library

2. Add BLEPeripheral library back compatible features

3. Fix IMU build issue

4. Fix the memset crash issue
  i.  The FIRQ doesn't save the LP_COUNTER register.
  ii. Update the code to save LP related register

5. Fix the central crash issue when peripheral disconnect

6. Revert the UART changes
   -This change will break the BLE's communication

7. Implement the balloc to replace old one
   -Create memory pool
   -Port V3's balloc
   -Fix the local name display unexpected chars

8. Fix ScanCallback, LED related issue
   -The Serial.print called in interrupt and interrupt block the Serial interrupt.
   -The resource not released when call disconnect API.

9. Fix the discover blocked when connect/disconnect the link successively

Block the disconnect if not receive the disconnect event

10. Return error when discover attributes if error happened

11. Update the back compatible comments

12. Fix the discover attribute failed issue
    -Add the -fcheck-new build option
    -Increase the IRQ stack size

13. Add discoverAttributesByService API
    - The sensorTag has many services and RAM is not enough for discover all services
    -This crash caused by bt_uuid_16 and bt_uuid_128 has different space and makes an address exception

14. Add keywords and fix read issue

15. Update the CurieBLE and delete BLE

Author: sgbihu

cores/arduino/UARTClass.cpp

@@ -168,7 +168,7 @@ int UARTClass::read( void )
 
 void UARTClass::flush( void )
 {
-  while (_tx_buffer->_iHead != *(volatile int*)&(_tx_buffer->_iTail)); //wait for transmit data to be sent
+  while (_tx_buffer->_iHead != _tx_buffer->_iTail); //wait for transmit data to be sent
   // Wait for transmission to complete
   while(!uart_tx_complete(CONFIG_UART_CONSOLE_INDEX));
 }
@@ -179,11 +179,12 @@ size_t UARTClass::write( const uint8_t uc_data )
     return(0);
 
   // Is the hardware currently busy?
-  if (_tx_buffer->_iTail != _tx_buffer->_iHead || !uart_tx_ready(CONFIG_UART_CONSOLE_INDEX))
+  if (_tx_buffer->_iTail != _tx_buffer->_iHead)
   {
     // If busy we buffer
     int l = (_tx_buffer->_iHead + 1) % UART_BUFFER_SIZE;
-    while (*(volatile int*)&(_tx_buffer->_iTail) == l); // Spin locks if we're about to overwrite the buffer. This continues once the data is sent
+    while (_tx_buffer->_iTail == l)
+      ; // Spin locks if we're about to overwrite the buffer. This continues once the data is sent
 
     _tx_buffer->_aucBuffer[_tx_buffer->_iHead] = uc_data;
     _tx_buffer->_iHead = l;
@@ -200,29 +201,21 @@ size_t UARTClass::write( const uint8_t uc_data )
 
 void UARTClass::IrqHandler( void )
 {
-  uart_irq_update(CONFIG_UART_CONSOLE_INDEX);
-  // if irq is Receiver Data Available
-  if(uart_irq_rx_ready(CONFIG_UART_CONSOLE_INDEX))
-  {
-    uint8_t uc_data;
-    int ret;
+  uint8_t uc_data;
+  int ret;
+  ret = uart_poll_in(CONFIG_UART_CONSOLE_INDEX, &uc_data);
+  
+  while ( ret != -1 ) {
+    _rx_buffer->store_char(uc_data);
     ret = uart_poll_in(CONFIG_UART_CONSOLE_INDEX, &uc_data);
-    
-    while ( ret != -1 ) {
-      _rx_buffer->store_char(uc_data);
-      ret = uart_poll_in(CONFIG_UART_CONSOLE_INDEX, &uc_data);
-    }
   }
 
-  // if irq is Transmitter Holding Register
-  else if(uart_irq_tx_ready(CONFIG_UART_CONSOLE_INDEX))
+  // Do we need to keep sending data?
+  if (!uart_irq_tx_ready(CONFIG_UART_CONSOLE_INDEX))
   {
-    if(_tx_buffer->_iTail != _tx_buffer->_iHead)
-    {
-      int end = (_tx_buffer->_iTail < _tx_buffer->_iHead) ? _tx_buffer->_iHead:UART_BUFFER_SIZE;
-      int l = min(end - _tx_buffer->_iTail, UART_FIFO_SIZE);
-      uart_fifo_fill(CONFIG_UART_CONSOLE_INDEX, _tx_buffer->_aucBuffer+_tx_buffer->_iTail, l);
-      _tx_buffer->_iTail = (_tx_buffer->_iTail+l)%UART_BUFFER_SIZE;
+    if (_tx_buffer->_iTail != _tx_buffer->_iHead) {
+      uart_poll_out(CONFIG_UART_CONSOLE_INDEX, _tx_buffer->_aucBuffer[_tx_buffer->_iTail]);
+      _tx_buffer->_iTail = (unsigned int)(_tx_buffer->_iTail + 1) % UART_BUFFER_SIZE;
     }
     else
     {