diff options
Diffstat (limited to 'c/src/lib/libbsp/i386/force386/console/console.c')
| -rw-r--r-- | c/src/lib/libbsp/i386/force386/console/console.c | 219 |
1 files changed, 219 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/i386/force386/console/console.c b/c/src/lib/libbsp/i386/force386/console/console.c new file mode 100644 index 0000000000..f1f019c487 --- /dev/null +++ b/c/src/lib/libbsp/i386/force386/console/console.c @@ -0,0 +1,219 @@ +/* + * This file contains the Force CPU386 console IO package. + * + * COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994. + * On-Line Applications Research Corporation (OAR). + * All rights assigned to U.S. Government, 1994. + * + * This material may be reproduced by or for the U.S. Government pursuant + * to the copyright license under the clause at DFARS 252.227-7013. This + * notice must appear in all copies of this file and its derivatives. + * + * $Id$ + */ + +#define F386_INIT + +#include <stdlib.h> + +#include <rtems.h> +#include "console.h" +#include "bsp.h" + +/* console_cleanup + * + * This routine is called at exit to clean up the console hardware. + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * Return values: + */ + +void console_cleanup( void ) +{ + register rtems_unsigned8 ignored; + /* + * FORCE technical support mentioned that it may be necessary to + * read the DUSCC RX_BUFFER port four times to remove all junk. + * This code is a little more paranoid. + */ + + inport_byte( RX_BUFFER, ignored ); + inport_byte( RX_BUFFER, ignored ); + inport_byte( RX_BUFFER, ignored ); + inport_byte( RX_BUFFER, ignored ); + inport_byte( RX_BUFFER, ignored ); +} + +/* console_initialize + * + * This routine initializes the console IO driver. + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * Return values: + */ + +rtems_device_driver console_initialize( + rtems_device_major_number major, + rtems_device_minor_number minor, + void *arg, + rtems_id self, + rtems_unsigned32 *status +) +{ + /* + * flush the console now and at exit. Just in case. + */ + + console_cleanup(); + + atexit( console_cleanup ); +} + + +/* is_character_ready + * + * This routine returns TRUE if a character is available. + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * Return values: + */ + +rtems_boolean is_character_ready( + char *ch +) +{ + register rtems_unsigned8 status; + + inport_byte( RX_STATUS, status ); + + if ( Is_rx_ready( status ) ) { + inport_byte( RX_BUFFER, status ); + *ch = status; + return TRUE; + } + return FALSE; +} + +/* inbyte + * + * This routine reads a character from the UART. + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * Return values: + * character read from UART + */ + +char inbyte( void ) +{ + register rtems_unsigned8 status; + char ch; + + do { + inport_byte( RX_STATUS, status ); + } while ( !Is_rx_ready( status ) ); + +#if ( PORTB == 1 ) + /* + * Force example code resets the Channel B Receiver here. + * It appears to cause XON's to be lost. + */ + + /* outport_byte( RX_STATUS, 0x10 ); */ +#endif + + inport_byte( RX_BUFFER, ch ); + + return ch; +} + +/* outbyte + * + * This routine transmits a character out the port. It supports + * XON/XOFF flow control. + * + * Input parameters: + * ch - character to be transmitted + * + * Output parameters: NONE + */ + +void outbyte( + char ch +) +{ + rtems_unsigned8 status; + + do { + inport_byte( TX_STATUS, status ); + } while ( !Is_tx_ready( status ) ); + +#if 0 + while ( is_character_ready( &status ) == TRUE ) { /* must be an XOFF */ + if ( status == XOFF ) + do { + while ( is_character_ready( &status ) == FALSE ) ; + } while ( status != XON ); + } +#endif + + outport_byte( TX_BUFFER, ch ); +} + +/* + * __read -- read bytes from the serial port. Ignore fd, since + * we only have stdin. + */ + +int __read( + int fd, + char *buf, + int nbytes +) +{ + int i = 0; + + for (i = 0; i < nbytes; i++) { + *(buf + i) = inbyte(); + if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) { + (*(buf + i++)) = '\n'; + (*(buf + i)) = 0; + break; + } + } + return (i); +} + +/* + * __write -- write bytes to the serial port. Ignore fd, since + * stdout and stderr are the same. Since we have no filesystem, + * open will only return an error. + */ + +int __write( + int fd, + char *buf, + int nbytes +) +{ + int i; + + for (i = 0; i < nbytes; i++) { + if (*(buf + i) == '\n') { + outbyte ('\r'); + } + outbyte (*(buf + i)); + } + return (nbytes); +} |