1 files changed, 201 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/dmv177/console/duart.c b/c/src/lib/libbsp/powerpc/dmv177/console/duart.c
new file mode 100644
index 0000000000..f72b37a832
--- /dev/null
+++ b/c/src/lib/libbsp/powerpc/dmv177/console/duart.c
@@ -0,0 +1,201 @@
+/*
+ *  duart.c
+ *
+ *  This code is a modified version of what you will find at the
+ *  end of the IDP User's manual.  The original code is copyrighted
+ *  by Motorola and Motorola Semiconductor Products as well as
+ *  Motorola Software products group.
+ *  
+ *  Modifications to the original IDP code by Doug McBride, Colorado
+ *  Space Grant College.  Modifications include a means of accessing
+ *  port B of the duart as well as port A as well as modifications for
+ *  buffering and RTEMS support.  Modifications are provided
+ *  as is and may not be correct.
+ *  
+ *  Rob Savoye provided the format for the mc68681 header file
+ *  
+ *  Joel Sherrill provided inspiration for recoding my original assembly
+ *  for this file into C (a good idea)
+ *  
+ *  COPYRIGHT (c) 1989-1998.
+ *  On-Line Applications Research Corporation (OAR).
+ *  Copyright assigned to U.S. Government, 1994.
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.OARcorp.com/rtems/license.html.
+ *
+ *  $Id: duart.c
+ */
+
+#define MC68681_OFFSET_MULTIPLIER 8
+#include <motorola/mc68681.h>
+#include <bsp.h>
+#include <ringbuf.h>
+          
+rtems_isr console_isr (rtems_vector_number vector);
+
+Ring_buffer_t TX_Buffer[2];
+Ring_buffer_t RX_Buffer[2];
+
+/*  PAGE
+ *
+ *  init_mc88681
+ *
+ *  volatile routine to initialize duart
+ *
+ *  Input parameters: NONE
+ *
+ *  Output parameters: NONE
+ *
+ *  Return Values:     NONE  
+ */
+
+volatile void init_mc88681()
+{
+  /*
+   *  Initialize Ring buffers
+   */
+  Ring_buffer_Initialize( &RX_Buffer[ 0 ] );
+  Ring_buffer_Initialize( &RX_Buffer[ 1 ] );
+
+  Ring_buffer_Initialize( &TX_Buffer[ 0 ] );
+  Ring_buffer_Initialize( &TX_Buffer[ 1 ] );
+}
+
+/*  PAGE
+ *
+ *  console_isr
+ *
+ *  interrupt handler for receive of character from duart on ports A & B 
+ *
+ *  Input parameters: NONE
+ *
+ *  Output parameters: NONE
+ *
+ *  Return Values:     NONE  
+ */
+
+rtems_isr console_isr (rtems_vector_number vector)
+{
+
+   /*
+    *  Fill me in later ...
+    */
+
+}
+
+
+/*  PAGE
+ *
+ *  console_outbyte_polled
+ *
+ *  This routine transmits a character out.
+ *
+ *  Input parameters:
+ *    port - port to transmit character to
+ *    ch  - character to be transmitted
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values: NONE
+ */
+
+void console_outbyte_polled(
+  int port,
+  char ch
+)
+{
+  unsigned char status;
+  unsigned char data;
+  unsigned char t = 0;
+
+  if (port == MC68681_PORT_A) { 
+    status = MC68681_STATUS_REG_A;
+    data = MC68681_TRANSMIT_BUFFER_A;
+  } else {
+    status = MC68681_STATUS_REG_B;
+    data = MC68681_TRANSMIT_BUFFER_B;
+  }
+
+  while ( !(MC68681_READ(DUART_ADDR, status) & MC68681_TX_READY) ){
+    if (t == 0) {
+      Debug_Entry( 0x8000 );
+      t++;
+    }
+  }
+  
+  Debug_Entry( 0x9000 );
+  MC68681_WRITE(DUART_ADDR, data, ch);
+}
+
+
+/*  PAGE
+ *
+ *  console_inbyte_polled
+ *
+ *  This routine reads a character from the UART.
+ *
+ *  Input parameters:
+ *    port - port to read character from
+ *
+ *  Output parameters:  NONE
+ *
+ *  Return values:
+ *    character read from UART
+ */
+
+#define MC68681_RECEIVE_ERRORS \
+      (MC68681_OVERRUN_ERROR | MC68681_PARITY_ERROR | MC68681_FRAMING_ERROR)
+
+char console_inbyte_polled( int port )
+{
+  char status;
+  char data;
+  char cmd;
+  unsigned char status_info;
+
+  /*  
+   * Set Port A or B unique variables.         
+   */
+  if (port == MC68681_PORT_A)  {
+    status = MC68681_STATUS_REG_A;
+    data   = MC68681_RECEIVE_BUFFER_A;
+    cmd    = MC68681_COMMAND_REG_A;
+  } else {
+    status = MC68681_STATUS_REG_B;
+    data   = MC68681_RECEIVE_BUFFER_B;
+    cmd    = MC68681_COMMAND_REG_B;
+  }
+
+  /* Wait for the Ready bit and Clear any errors */
+  for ( ; ; ) {
+    status_info = MC68681_READ(DUART_ADDR, status);
+    if ( status_info & MC68681_RX_READY )
+      break;
+
+     if ( status_info & MC68681_RECEIVE_ERRORS )
+         MC68681_WRITE( DUART_ADDR, cmd, MC68681_MODE_REG_RESET_ERROR );
+  }
+
+  return MC68681_READ(DUART_ADDR, data);
+}
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+
+