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/*===============================================================*\
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| File: serdbgio.c |
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+-----------------------------------------------------------------+
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| Copyright (c) 2002 IMD |
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| Ingenieurbuero fuer Microcomputertechnik Th. Doerfler |
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| Hebststr. 8, 82178 Puchheim, Germany |
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| <Thomas.Doerfler@imd-systems.de> |
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| The license and distribution terms for this file may be |
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| found in the file LICENSE in this distribution or at |
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| http://www.OARcorp.com/rtems/license.html. |
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| all rights reserved |
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+-----------------------------------------------------------------+
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| TERMIOS serial gdb interface support |
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| the functions in this file allow the standard gdb stubs like |
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| "m68k-stub.c" to access any serial interfaces that work with |
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| RTEMS termios in polled mode |
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+-----------------------------------------------------------------+
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| date history ID |
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| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
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| 10.05.02 creation doe |
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|*****************************************************************|
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|* serdbgio.c,v 1.1 2002/06/27 21:25:13 joel Exp
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*
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|*****************************************************************|
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\*===============================================================*/
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#include <rtems.h>
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#include <rtems/libio_.h>
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#include <errno.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <termios.h>
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#include <rtems/termiostypes.h>
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#include <serdbg.h>
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/*
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* internal variables
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*/
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int serdbg_fd = -1;
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struct rtems_termios_tty *serdbg_tty;
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/*=========================================================================*\
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| Function: |
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\*-------------------------------------------------------------------------*/
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int serdbg_open
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/*-------------------------------------------------------------------------*\
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| Purpose: |
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| try to open given serial debug port |
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+---------------------------------------------------------------------------+
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| Input Parameters: |
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\*-------------------------------------------------------------------------*/
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(
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const char *dev_name, /* name of device to open */
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unsigned32 baudrate /* baud rate to use */
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)
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/*-------------------------------------------------------------------------*\
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| Return Value: |
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| 0 on success, -1 and errno otherwise |
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\*=========================================================================*/
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{
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boolean err_occurred = FALSE;
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rtems_libio_t *iop = NULL;
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struct termios act_termios;
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tcflag_t baudcode = B0;
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#define FD_STORE_CNT 3
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int fd_store[FD_STORE_CNT];
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int fd_store_used = 0;
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/*
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* translate baudrate into baud code
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*/
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switch(baudrate) {
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case 50: baudcode = B50; break;
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case 75: baudcode = B75; break;
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case 110: baudcode = B110; break;
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case 134: baudcode = B134; break;
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case 150: baudcode = B150; break;
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case 200: baudcode = B200; break;
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case 300: baudcode = B300; break;
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case 600: baudcode = B600; break;
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case 1200: baudcode = B1200; break;
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case 1800: baudcode = B1800; break;
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case 2400: baudcode = B2400; break;
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case 4800: baudcode = B4800; break;
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case 9600: baudcode = B9600; break;
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case 19200: baudcode = B19200; break;
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case 38400: baudcode = B38400; break;
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case 57600: baudcode = B57600; break;
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case 115200: baudcode = B115200; break;
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case 230400: baudcode = B230400; break;
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case 460800: baudcode = B460800; break;
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default : err_occurred = TRUE; errno = EINVAL; break;
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}
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/*
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* open device for serdbg operation
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* skip any fds that are between 0..2, because they are
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* reserved for stdin/out/err
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*/
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if (!err_occurred &&
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(dev_name != NULL) &&
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(dev_name[0] != '\0')) {
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do {
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serdbg_fd = open(dev_name,O_RDWR);
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if (serdbg_fd < 0) {
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err_occurred = TRUE;
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}
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else {
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if (serdbg_fd < 3) {
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if (fd_store_used >= FD_STORE_CNT) {
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err_occurred = TRUE;
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}
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else {
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fd_store[fd_store_used++] = serdbg_fd;
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}
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}
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}
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} while (!err_occurred &&
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(serdbg_fd < 3));
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}
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/*
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* close any fds, that have been placed in fd_store
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* so fd 0..2 are reusable again
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*/
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while (--fd_store_used >= 0) {
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close(fd_store[fd_store_used]);
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}
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/*
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* capture tty structure
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*/
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if (!err_occurred) {
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iop = &rtems_libio_iops[serdbg_fd];
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serdbg_tty = iop->data1;
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}
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/*
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* set device baudrate
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* (and transp mode, this is not really needed)
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* ...
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*/
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/*
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* ... get fd settings
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*/
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if (!err_occurred &&
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(0 != tcgetattr(serdbg_fd,&act_termios))) {
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err_occurred = TRUE;
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}
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if (!err_occurred) {
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act_termios.c_iflag
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&= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
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|INLCR|IGNCR|ICRNL|IXON);
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act_termios.c_oflag
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&= ~OPOST;
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act_termios.c_lflag
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&= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN);
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cfsetospeed(&act_termios,baudcode);
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cfsetispeed(&act_termios,baudcode);
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if (0 != tcsetattr(serdbg_fd,TCSANOW,&act_termios)) {
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err_occurred = TRUE;
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}
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}
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return (err_occurred
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? -1
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: 0);
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}
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void putDebugChar(char c) __attribute__ ((__weak__));
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/*=========================================================================*\
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| Function: |
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\*-------------------------------------------------------------------------*/
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void putDebugChar
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/*-------------------------------------------------------------------------*\
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| Purpose: |
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| send one character to serial port |
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+---------------------------------------------------------------------------+
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| Input Parameters: |
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\*-------------------------------------------------------------------------*/
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(
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char c /* character to print */
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)
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/*-------------------------------------------------------------------------*\
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| Return Value: |
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| <none> |
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\*=========================================================================*/
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{
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/*
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* call serdbg polling callout, if available
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*/
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if (serdbg_conf.callout != NULL) {
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serdbg_conf.callout();
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}
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/*
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* check, whether debug serial port is available
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*/
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if ((serdbg_tty != NULL) &&
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(serdbg_tty->device.write != NULL)) {
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/*
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* send character to debug serial port
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*/
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serdbg_tty->device.write(serdbg_tty->minor,&c,1);
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}
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}
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int getDebugChar(void) __attribute__ ((__weak__));
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/*=========================================================================*\
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| Function: |
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\*-------------------------------------------------------------------------*/
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int getDebugChar
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/*-------------------------------------------------------------------------*\
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| Purpose: |
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| wait for one character from serial port |
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+---------------------------------------------------------------------------+
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| Input Parameters: |
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\*-------------------------------------------------------------------------*/
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(
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void /* none */
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)
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/*-------------------------------------------------------------------------*\
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| Return Value: |
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| received character |
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\*=========================================================================*/
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{
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int c = -1;
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/*
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* check, whether debug serial port is available
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*/
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if ((serdbg_tty != NULL) &&
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(serdbg_tty->device.pollRead != NULL)) {
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do {
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/*
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* call serdbg polling callout, if available
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*/
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if (serdbg_conf.callout != NULL) {
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serdbg_conf.callout();
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}
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/*
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* get character from debug serial port
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*/
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c = serdbg_tty->device.pollRead(serdbg_tty->minor);
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} while (c < 0);
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}
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return c;
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}
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