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/*
* Copyright (c) 2012, 2015 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
/*
* Console driver for Lauterbach Trace32 Simulator. The implementation is
* based on the example in "demo/powerpc/etc/terminal/terminal_mpc85xx.cmm" in
* the Trace32 system directory.
*/
#include <rtems/bspIo.h>
#include <rtems/console.h>
#include <rtems/termiostypes.h>
volatile unsigned char messagebufferin[256];
volatile unsigned char messagebufferout[256];
typedef struct {
rtems_termios_device_context base;
int input_size;
int input_index;
} t32_console_context;
static t32_console_context t32_console_instance;
static bool t32_console_first_open(
rtems_termios_tty *tty,
rtems_termios_device_context *base,
struct termios *term,
rtems_libio_open_close_args_t *args
)
{
rtems_termios_set_initial_baud(tty, 115200);
return true;
}
static int t32_console_read_polled(rtems_termios_device_context *base)
{
t32_console_context *ctx = (t32_console_context *) base;
int c;
if (ctx->input_size == 0) {
int new_bufsize = messagebufferin[0];
if (new_bufsize != 0) {
ctx->input_size = new_bufsize;
ctx->input_index = 0;
} else {
return -1;
}
}
c = messagebufferin[4 + ctx->input_index];
++ctx->input_index;
if (ctx->input_index >= ctx->input_size) {
messagebufferin[0] = 0;
ctx->input_size = 0;
}
return c;
}
static void t32_console_write_char_polled(char c)
{
while (messagebufferout[0] != 0) {
/* Wait for ready */
}
messagebufferout[4] = (unsigned char) c;
messagebufferout[0] = 1;
}
static void t32_console_write_polled(
rtems_termios_device_context *base,
const char *s,
size_t n
)
{
size_t i;
for (i = 0; i < n; ++i) {
t32_console_write_char_polled(s[i]);
}
}
const rtems_termios_device_handler t32_console_handler = {
.first_open = t32_console_first_open,
.poll_read = t32_console_read_polled,
.write = t32_console_write_polled,
.mode = TERMIOS_POLLED
};
rtems_device_driver console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
t32_console_context *ctx = &t32_console_instance;
rtems_termios_initialize();
rtems_termios_device_context_initialize(&ctx->base, "T32 Console");
rtems_termios_device_install(
CONSOLE_DEVICE_NAME,
&t32_console_handler,
NULL,
&ctx->base
);
return RTEMS_SUCCESSFUL;
}
BSP_output_char_function_type BSP_output_char = t32_console_write_char_polled;
BSP_polling_getchar_function_type BSP_poll_char = NULL;
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