AP_HAL_ChibiOS: add HAL_UART_STATS_ENABLED to disable stats gathering

libraries/AP_HAL_ChibiOS/UARTDriver.cpp

@@ -1745,6 +1745,7 @@ uint16_t UARTDriver::get_options(void) const
     return _last_options;
 }
 
+#if HAL_UART_STATS_ENABLED
 // request information on uart I/O for @SYS/uarts.txt for this uart
 void UARTDriver::uart_info(ExpandingString &str)
 {
@@ -1765,6 +1766,7 @@ void UARTDriver::uart_info(ExpandingString &str)
     _rx_stats_bytes = 0;
     _last_stats_ms = now_ms;
 }
+#endif
 
 /*
   software control of the CTS pin if available. Return false if

libraries/AP_HAL_ChibiOS/UARTDriver.h

@@ -141,8 +141,10 @@ public:
         return _baudrate/(9*1024);
     }
 
+#if HAL_UART_STATS_ENABLED
     // request information on uart I/O for one uart
     void uart_info(ExpandingString &str) override;
+#endif
 
     /*
       return true if this UART has DMA enabled on both RX and TX

libraries/AP_HAL_ChibiOS/Util.cpp

@@ -586,10 +586,10 @@ void Util::apply_persistent_params(void) const
 extern ChibiOS::UARTDriver uart_io;
 #endif
 
+#if HAL_UART_STATS_ENABLED
 // request information on uart I/O
 void Util::uart_info(ExpandingString &str)
 {
-#if !defined(HAL_NO_UARTDRIVER)    
     // a header to allow for machine parsers to determine format
     str.printf("UARTV1\n");
     for (uint8_t i = 0; i < HAL_UART_NUM_SERIAL_PORTS; i++) {
@@ -603,8 +603,8 @@ void Util::uart_info(ExpandingString &str)
     str.printf("IOMCU   ");
     uart_io.uart_info(str);
 #endif
-#endif // HAL_NO_UARTDRIVER
 }
+#endif
 
 /**
  * This method will generate random values with set size. It will fall back to AP_Math's get_random16()

libraries/AP_HAL_ChibiOS/Util.h

@@ -87,8 +87,10 @@ public:
     // save/load key persistent parameters in bootloader sector
     bool load_persistent_params(ExpandingString &str) const override;
 #endif
+#if HAL_UART_STATS_ENABLED
     // request information on uart I/O
     virtual void uart_info(ExpandingString &str) override;
+#endif
 
     // returns random values
     bool get_random_vals(uint8_t* data, size_t size) override;