Don't call updateFIFO() if we have data in _fifo

Author: FozzTexx

lib/hardware/ESP32UARTChannel.cpp

@@ -87,8 +87,8 @@ void ESP32UARTChannel::updateFIFO()
     }
 #else
     size_t old_len = _fifo.size();
-    _fifo.resize(old_len + 256);
-    int result = uart_read_bytes(_uart_num, &_fifo[old_len], 256,
+    _fifo.resize(old_len + 1);
+    int result = uart_read_bytes(_uart_num, &_fifo[old_len], 1,
                                  pdMS_TO_TICKS(read_timeout_ms));
     Debug_printv("result %d\n", result);
     if (result < 0)

lib/hardware/IOChannel.cpp

@@ -4,8 +4,8 @@
 
 size_t IOChannel::available()
 {
-    updateFIFO();
-    //Debug_printf("FN AVAIL: %i\r\n", _fifo.size());
+    if (!_fifo.size())
+        updateFIFO();
     return _fifo.size();
 }