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/**
* @file printk-support.c
*
* @ingroup tms570
*
* @brief definitions of serial line for debugging.
*/
/*
* Copyright (c) 2014 Premysl Houdek <kom541000@gmail.com>
*
* Google Summer of Code 2014 at
* Czech Technical University in Prague
* Zikova 1903/4
* 166 36 Praha 6
* Czech Republic
*
* Based on LPC24xx and LPC1768 BSP
* by embedded brains GmbH and others
*
* 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.
*/
#include <rtems/bspIo.h>
#include <rtems/sysinit.h>
#include <stdint.h>
#include <string.h>
#include <bsp/tms570-sci.h>
#include <bsp/tms570-sci-driver.h>
#define TMS570_CONSOLE (&driver_context_table[0])
/**
* @brief Puts chars into peripheral
*
* debug functions always use serial dev 0 peripheral
*
* @retval Void
*/
static void tms570_debug_console_putc(char ch)
{
tms570_sci_context *ctx = TMS570_CONSOLE;
volatile tms570_sci_t *regs = ctx->regs;
rtems_interrupt_level level;
rtems_interrupt_disable(level);
while ( ( regs->FLR & TMS570_SCI_FLR_TXRDY ) == 0) {
rtems_interrupt_flash(level);
}
regs->TD = ch;
while ( ( regs->FLR & TMS570_SCI_FLR_TX_EMPTY ) == 0) {
rtems_interrupt_flash(level);
}
rtems_interrupt_enable(level);
}
/**
* @brief debug console output
*
* debug functions always use serial dev 0 peripheral
*
* @retval Void
*/
static void tms570_debug_console_out(char c)
{
if ( c == '\n' ) {
tms570_debug_console_putc('\r');
}
tms570_debug_console_putc(c);
}
static void tms570_debug_console_init(void)
{
tms570_sci_context *ctx = TMS570_CONSOLE;
struct termios term;
tms570_sci_initialize(ctx);
memset(&term, 0, sizeof(term));
term.c_cflag = B115200;
tms570_sci_set_attributes(&ctx->base, &term);
BSP_output_char = tms570_debug_console_out;
}
static void tms570_debug_console_early_init(char c)
{
tms570_debug_console_init();
tms570_debug_console_out(c);
}
/**
* @brief debug console input
*
* debug functions always use serial dev 0 peripheral
*
* @retval x Read char
* @retval -1 No input character available
*/
static int tms570_debug_console_in( void )
{
tms570_sci_context *ctx = TMS570_CONSOLE;
volatile tms570_sci_t *regs = ctx->regs;
rtems_interrupt_level level;
int c;
rtems_interrupt_disable(level);
if ( regs->FLR & TMS570_SCI_FLR_RXRDY ) {
c = (unsigned char) regs->RD;
} else {
c = -1;
}
rtems_interrupt_enable(level);
return c;
}
BSP_output_char_function_type BSP_output_char =
tms570_debug_console_early_init;
BSP_polling_getchar_function_type BSP_poll_char = tms570_debug_console_in;
RTEMS_SYSINIT_ITEM(
tms570_debug_console_init,
RTEMS_SYSINIT_BSP_START,
RTEMS_SYSINIT_ORDER_LAST
);
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