freemodbus: Fix remove critical_sections

Closes: https://github.com/espressif/esp-idf/issues/3009

components/freemodbus/modbus/ascii/mbascii.c

@@ -110,7 +110,6 @@ eMBASCIIInit( UCHAR ucSlaveAddress, UCHAR ucPort, ULONG ulBaudRate, eMBParity eP
     eMBErrorCode    eStatus = MB_ENOERR;
     ( void )ucSlaveAddress;
     
-    ENTER_CRITICAL_SECTION(  );
     ucMBLFCharacter = MB_ASCII_DEFAULT_LF;
 
     if( xMBPortSerialInit( ucPort, ulBaudRate, 7, eParity ) != TRUE )
@@ -122,7 +121,6 @@ eMBASCIIInit( UCHAR ucSlaveAddress, UCHAR ucPort, ULONG ulBaudRate, eMBParity eP
         eStatus = MB_EPORTERR;
     }
 
-    EXIT_CRITICAL_SECTION(  );
 
     return eStatus;
 }
@@ -130,10 +128,8 @@ eMBASCIIInit( UCHAR ucSlaveAddress, UCHAR ucPort, ULONG ulBaudRate, eMBParity eP
 void
 eMBASCIIStart( void )
 {
-    ENTER_CRITICAL_SECTION(  );
     vMBPortSerialEnable( TRUE, FALSE );
     eRcvState = STATE_RX_IDLE;
-    EXIT_CRITICAL_SECTION(  );
 
     /* No special startup required for ASCII. */
     ( void )xMBPortEventPost( EV_READY );
@@ -142,10 +138,8 @@ eMBASCIIStart( void )
 void
 eMBASCIIStop( void )
 {
-    ENTER_CRITICAL_SECTION(  );
     vMBPortSerialEnable( FALSE, FALSE );
     vMBPortTimersDisable(  );
-    EXIT_CRITICAL_SECTION(  );
 }
 
 eMBErrorCode

components/freemodbus/modbus/rtu/mbrtu.c

@@ -84,7 +84,6 @@ eMBRTUInit( UCHAR ucSlaveAddress, UCHAR ucPort, ULONG ulBaudRate, eMBParity ePar
     ULONG           usTimerT35_50us;
 
     ( void )ucSlaveAddress;
-    ENTER_CRITICAL_SECTION(  );
 
     /* Modbus RTU uses 8 Databits. */
     if( xMBPortSerialInit( ucPort, ulBaudRate, 8, eParity ) != TRUE )
@@ -117,7 +116,6 @@ eMBRTUInit( UCHAR ucSlaveAddress, UCHAR ucPort, ULONG ulBaudRate, eMBParity ePar
             eStatus = MB_EPORTERR;
         }
     }
-    EXIT_CRITICAL_SECTION(  );
 
     return eStatus;
 }
@@ -125,7 +123,6 @@ eMBRTUInit( UCHAR ucSlaveAddress, UCHAR ucPort, ULONG ulBaudRate, eMBParity ePar
 void
 eMBRTUStart( void )
 {
-    ENTER_CRITICAL_SECTION(  );
     /* Initially the receiver is in the state STATE_RX_INIT. we start
      * the timer and if no character is received within t3.5 we change
      * to STATE_RX_IDLE. This makes sure that we delay startup of the
@@ -135,16 +132,13 @@ eMBRTUStart( void )
     vMBPortSerialEnable( TRUE, FALSE );
     vMBPortTimersEnable(  );
 
-    EXIT_CRITICAL_SECTION(  );
 }
 
 void
 eMBRTUStop( void )
 {
-    ENTER_CRITICAL_SECTION(  );
     vMBPortSerialEnable( FALSE, FALSE );
     vMBPortTimersDisable(  );
-    EXIT_CRITICAL_SECTION(  );
 }
 
 // The lines below are required to suppress GCC warnings about unused but set variable 'xFrameReceived'