Gerrie de Jager / Mbed 2 deprecated Creatron_RS485

This is a RS485 class that uses the second UART and was tested on a Nucleo F030R8. A main demo program howto use the class is included. This class control the direction pin on the transceiver buffer automatically, and used transmit and receive interrupts. Ring buffers (256 bytes) are implemented on both transmission and reception. It assumes a ADM3485 'type' buffer where pins 2 ans 3 are connected and seen as direction. This test program could easily be adapted as base for other programs.

Dependencies:   mbed

Diff: dlms_comms.cpp

Revision:
11:ca1e0ca3a673
Parent:
10:e104a1b24165
--- a/dlms_comms.cpp	Tue Nov 11 21:02:06 2014 +0000
+++ b/dlms_comms.cpp	Sun Nov 23 08:13:26 2014 +0000
@@ -5,11 +5,11 @@
 
 //#define DEBUG_DLMS_COMMS 
 
-   // Instantiate the raw serial (2nd uart) Tx then Rx
+// Instantiate the raw serial (2nd uart) Tx then Rx
    RawSerial  rs485(PA_9, PA_10);
-  // pin to switch the rs485 buffer direction
+  
+// pin to switch the rs485 buffer direction
   DigitalOut dir_485 (PB_0);
-  //DigitalOut dir_485 (D7);
   
 /** ---------------------------------------------------------------------------
  * @brief  C O N S T R U C T O R
@@ -30,24 +30,11 @@
     // when characters received
     rs485.attach(this,
                  &dlms_comms::Rx_interrupt,
-                 //RawSerial::RxIrq
                  Serial::RxIrq);
     timer = NULL;
     debug_uart = NULL;
     tx_irq_count = 0l;
     rx_irq_count = 0l;
-    
-    
-//        /** Set the flow control type on the serial port
-//     *
-//     *  @param type the flow control type (Disabled, RTS, CTS, RTSCTS)
-//     *  @param flow1 the first flow control pin (RTS for RTS or RTSCTS, CTS for CTS)
-//     *  @param flow2 the second flow control pin (CTS for RTSCTS)
-//     */
-//    rs485.set_flow_control(RTSCTS , //Flow type, 
-//                           dir_485, //PB_0, //PinName flow1=NC, 
-//                           dir_485 //PB_0 //PinName flow2=NC
-//                           );
 }
 /** ---------------------------------------------------------------------------
  * @brief bq34z110::init_port_expander Put all ports in INPUT mode
@@ -60,9 +47,9 @@
     // we use the parent timer and debug port
     debug_uart  = parent_uart; 
     timer       = parent_timer;
-//#ifdef DEBUG_DLMS_COMMS    
-    //debug_uart->printf ("   init_dlms_comms..\r\n");
-//#endif      
+#ifdef DEBUG_DLMS_COMMS    
+    debug_uart->printf ("   init_dlms_comms..\r\n");
+#endif      
 }
 /** ---------------------------------------------------------------------------
  * @brief dlms_comms::initialise This method initialise the rs485 comms port
@@ -107,12 +94,12 @@
     rs485.format((int) bits,
                  my_parity,
                  (int) stop_bits);
-//#  ifdef DEBUG_DLMS_COMMS    
-     //debug_uart->printf ("   init_dlms_comms..Baudrate (%d) %d bits Parity=%c\r\n",
-     //                     baudrate, bits, parity);
-//#  endif                          
+#  ifdef DEBUG_DLMS_COMMS    
+     debug_uart->printf ("   init_dlms_comms..Baudrate (%d) %d bits Parity=%c\r\n",
+                         baudrate, bits, parity);
      // dummy send packet to rs485 
-     //send_packet ("\r\nHello cruel world\r\n",12);       
+     send_packet ("\r\nHello cruel world\r\n",12);       
+#  endif                          
      if ( rs485.readable())
           rs485.getc();
 }
@@ -130,9 +117,11 @@
 void dlms_comms::Tx_interrupt(void)
 {
     tx_irq_count++;
+    
+    // disable the transmit interrupt
+    rs485.attach(NULL, Serial::TxIrq);
     // enable the receiver, we are finito with the transmission of characters
     // this changes the direction on the transceiver buffer
-    rs485.attach(NULL, Serial::TxIrq);
     dir_485 = 0;       
 }
 /** ---------------------------------------------------------------------------