1088 lines
31 KiB
C
1088 lines
31 KiB
C
/****************************************************************************
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* arch/arm/src/samdl/sam_serial.c
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*
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* Copyright (C) 2014-2015 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <stdint.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include <semaphore.h>
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#include <string.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/irq.h>
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#include <nuttx/arch.h>
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#include <nuttx/serial/serial.h>
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#include <arch/serial.h>
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#include <arch/board/board.h>
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#include "up_arch.h"
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#include "up_internal.h"
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#include "chip.h"
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#include "sam_config.h"
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#include "sam_usart.h"
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#include "sam_lowputc.h"
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#include "sam_serial.h"
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#ifdef SAMDL_HAVE_USART
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* If we are not using the serial driver for the console, then we still must
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* provide some minimal implementation of up_putc.
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*/
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#ifdef USE_SERIALDRIVER
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/* Which USART with be tty0/console and which tty1? tty2? tty3? tty4? tty5? */
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/* First pick the console and ttys0. This could be any of USART0-5 */
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#if defined(CONFIG_USART0_SERIAL_CONSOLE)
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# define CONSOLE_DEV g_usart0port /* USART0 is console */
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# define TTYS0_DEV g_usart0port /* USART0 is ttyS0 */
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# define USART0_ASSIGNED 1
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#elif defined(CONFIG_USART1_SERIAL_CONSOLE)
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# define CONSOLE_DEV g_usart1port /* USART1 is console */
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# define TTYS0_DEV g_usart1port /* USART1 is ttyS0 */
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# define USART1_ASSIGNED 1
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#elif defined(CONFIG_USART2_SERIAL_CONSOLE)
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# define CONSOLE_DEV g_usart2port /* USART2 is console */
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# define TTYS0_DEV g_usart2port /* USART2 is ttyS0 */
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# define USART2_ASSIGNED 1
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#elif defined(CONFIG_USART3_SERIAL_CONSOLE)
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# define CONSOLE_DEV g_usart3port /* USART3 is console */
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# define TTYS0_DEV g_usart3port /* USART3 is ttyS0 */
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# define USART3_ASSIGNED 1
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#elif defined(CONFIG_USART4_SERIAL_CONSOLE)
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# define CONSOLE_DEV g_usart4port /* USART4 is console */
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# define TTYS0_DEV g_usart4port /* USART4 is ttyS0 */
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# define USART4_ASSIGNED 1
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#elif defined(CONFIG_USART5_SERIAL_CONSOLE)
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# define CONSOLE_DEV g_usart5port /* USART5 is console */
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# define TTYS5_DEV g_usart5port /* USART5 is ttyS0 */
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#else
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# undef CONSOLE_DEV /* No console */
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# if defined(SAMDL_HAVE_USART0)
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# define TTYS0_DEV g_usart0port /* USART0 is ttyS0 */
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# define USART0_ASSIGNED 1
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# elif defined(SAMDL_HAVE_USART1)
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# define TTYS0_DEV g_usart1port /* USART1 is ttyS0 */
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# define USART1_ASSIGNED 1
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# elif defined(SAMDL_HAVE_USART2)
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# define TTYS0_DEV g_usart2port /* USART2 is ttyS0 */
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# define USART2_ASSIGNED 1
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# elif defined(SAMDL_HAVE_USART3)
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# define TTYS0_DEV g_usart3port /* USART3 is ttyS0 */
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# define USART3_ASSIGNED 1
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# elif defined(SAMDL_HAVE_USART4)
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# define TTYS0_DEV g_usart4port /* USART4 is ttyS0 */
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# define USART4_ASSIGNED 1
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# elif defined(SAMDL_HAVE_USART5)
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# define TTYS0_DEV g_usart5port /* USART5 is ttyS0 */
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# define USART5_ASSIGNED 1
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# endif
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#endif
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/* Pick ttys1. This could be any of USART0-5 excluding the console USART. */
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#if defined(SAMDL_HAVE_USART0) && !defined(USART0_ASSIGNED)
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# define TTYS1_DEV g_usart0port /* USART0 is ttyS1 */
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# define USART0_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART1) && !defined(USART1_ASSIGNED)
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# define TTYS1_DEV g_usart1port /* USART1 is ttyS1 */
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# define USART1_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART2) && !defined(USART2_ASSIGNED)
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# define TTYS1_DEV g_usart2port /* USART2 is ttyS1 */
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# define USART2_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART3) && !defined(USART3_ASSIGNED)
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# define TTYS1_DEV g_usart3port /* USART3 is ttyS1 */
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# define USART3_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART4) && !defined(USART4_ASSIGNED)
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# define TTYS1_DEV g_usart4port /* USART4 is ttyS1 */
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# define USART4_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART5) && !defined(USART5_ASSIGNED)
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# define TTYS1_DEV g_usart5port /* USART5 is ttyS1 */
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# define USART5_ASSIGNED 1
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#endif
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/* Pick ttys2. This could be one of USART1-5. It can't be USART0
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* because that was either assigned as ttyS0 or ttys1. One of these
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* could also be the console.
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*/
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#if defined(SAMDL_HAVE_USART1) && !defined(USART1_ASSIGNED)
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# define TTYS2_DEV g_usart1port /* USART1 is ttyS2 */
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# define USART1_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART2) && !defined(USART2_ASSIGNED)
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# define TTYS2_DEV g_usart2port /* USART2 is ttyS2 */
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# define USART2_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART3) && !defined(USART3_ASSIGNED)
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# define TTYS2_DEV g_usart3port /* USART3 is ttyS2 */
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# define USART3_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART4) && !defined(USART4_ASSIGNED)
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# define TTYS2_DEV g_usart4port /* USART4 is ttyS2 */
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# define USART4_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART5) && !defined(USART5_ASSIGNED)
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# define TTYS2_DEV g_usart5port /* USART5 is ttyS2 */
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# define USART5_ASSIGNED 1
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#endif
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/* Pick ttys3. This could be one of USART2-5. It can't be USART0-1 because
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* those have already been assigned to ttsyS0, 1, or 2. One of
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* USART2-5 could also be the console.
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*/
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#if defined(SAMDL_HAVE_USART2) && !defined(USART2_ASSIGNED)
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# define TTYS3_DEV g_usart2port /* USART2 is ttyS3 */
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# define USART2_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART3) && !defined(USART3_ASSIGNED)
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# define TTYS3_DEV g_usart3port /* USART3 is ttyS3 */
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# define USART3_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART4) && !defined(USART4_ASSIGNED)
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# define TTYS3_DEV g_usart4port /* USART4 is ttyS3 */
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# define USART4_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART5) && !defined(USART5_ASSIGNED)
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# define TTYS3_DEV g_usart5port /* USART5 is ttyS3 */
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# define USART5_ASSIGNED 1
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#endif
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/* Pick ttys4. This could be one of USART3-5. It can't be USART0-2
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* because those have already been assigned to ttsyS0, 1, 2 or 3. One of
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* USART3-5 could also be the console.
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*/
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#if defined(SAMDL_HAVE_USART3) && !defined(USART3_ASSIGNED)
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# define TTYS4_DEV g_usart3port /* USART3 is ttyS4 */
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# define USART3_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART4) && !defined(USART4_ASSIGNED)
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# define TTYS4_DEV g_usart4port /* USART4 is ttyS4 */
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# define USART4_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART5) && !defined(USART5_ASSIGNED)
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# define TTYS4_DEV g_usart5port /* USART5 is ttyS4 */
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# define USART5_ASSIGNED 1
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#endif
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/* Pick ttys5. This could be one of USART4-5. It can't be USART0-3
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* because those have already been assigned to ttsyS0, 1, 2, 3 or 4.
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* One of USART4-5 could also be the console.
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*/
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#if defined(SAMDL_HAVE_USART4) && !defined(USART4_ASSIGNED)
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# define TTYS5_DEV g_usart4port /* USART4 is ttyS5 */
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# define USART4_ASSIGNED 1
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#elif defined(SAMDL_HAVE_USART5) && !defined(USART5_ASSIGNED)
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# define TTYS5_DEV g_usart5port /* USART5 is ttyS5 */
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# define USART5_ASSIGNED 1
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#endif
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/****************************************************************************
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* Private Types
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****************************************************************************/
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struct sam_dev_s
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{
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/* Common USART configuration */
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const struct sam_usart_config_s * const config;
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/* Information unique to the serial driver */
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xcpt_t handler; /* Interrupt handler */
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};
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/* Support functions */
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static inline uint8_t
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sam_serialin8(struct sam_dev_s *priv, int offset);
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static inline void
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sam_serialout8(struct sam_dev_s *priv, int offset,
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uint8_t regval);
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static inline uint16_t
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sam_serialin16(struct sam_dev_s *priv, int offset);
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static inline void
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sam_serialout16(struct sam_dev_s *priv, int offset,
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uint16_t regval);
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static void sam_disableallints(struct sam_dev_s *priv);
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static int sam_interrupt(struct uart_dev_s *dev);
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#ifdef SAMDL_HAVE_USART0
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static int sam_usart0_interrupt(int irq, void *context);
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#endif
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#ifdef SAMDL_HAVE_USART1
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static int sam_usart1_interrupt(int irq, void *context);
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#endif
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#ifdef SAMDL_HAVE_USART2
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static int sam_usart2_interrupt(int irq, void *context);
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#endif
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#ifdef SAMDL_HAVE_USART3
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static int sam_usart3_interrupt(int irq, void *context);
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#endif
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#ifdef SAMDL_HAVE_USART4
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static int sam_usart4_interrupt(int irq, void *context);
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#endif
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#ifdef SAMDL_HAVE_USART5
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static int sam_usart5_interrupt(int irq, void *context);
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#endif
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/* UART methods */
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static int sam_setup(struct uart_dev_s *dev);
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static void sam_shutdown(struct uart_dev_s *dev);
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static int sam_attach(struct uart_dev_s *dev);
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static void sam_detach(struct uart_dev_s *dev);
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static int sam_ioctl(struct file *filep, int cmd, unsigned long arg);
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static int sam_receive(struct uart_dev_s *dev, uint32_t *status);
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static void sam_rxint(struct uart_dev_s *dev, bool enable);
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static bool sam_rxavailable(struct uart_dev_s *dev);
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static void sam_send(struct uart_dev_s *dev, int ch);
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static void sam_txint(struct uart_dev_s *dev, bool enable);
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static bool sam_txempty(struct uart_dev_s *dev);
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/****************************************************************************
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* Private Variables
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****************************************************************************/
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static const struct uart_ops_s g_uart_ops =
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{
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.setup = sam_setup,
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.shutdown = sam_shutdown,
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.attach = sam_attach,
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.detach = sam_detach,
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.ioctl = sam_ioctl,
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.receive = sam_receive,
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.rxint = sam_rxint,
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.rxavailable = sam_rxavailable,
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#ifdef CONFIG_SERIAL_IFLOWCONTROL
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.rxflowcontrol = NULL,
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#endif
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.send = sam_send,
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.txint = sam_txint,
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.txready = sam_txempty,
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.txempty = sam_txempty,
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};
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/* I/O buffers */
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#ifdef SAMDL_HAVE_USART0
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static char g_usart0rxbuffer[CONFIG_USART0_RXBUFSIZE];
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static char g_usart0txbuffer[CONFIG_USART0_TXBUFSIZE];
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#endif
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#ifdef SAMDL_HAVE_USART1
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static char g_usart1rxbuffer[CONFIG_USART1_RXBUFSIZE];
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static char g_usart1txbuffer[CONFIG_USART1_TXBUFSIZE];
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#endif
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#ifdef SAMDL_HAVE_USART2
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static char g_usart2rxbuffer[CONFIG_USART2_RXBUFSIZE];
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static char g_usart2txbuffer[CONFIG_USART2_TXBUFSIZE];
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#endif
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#ifdef SAMDL_HAVE_USART3
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static char g_usart3rxbuffer[CONFIG_USART3_RXBUFSIZE];
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static char g_usart3txbuffer[CONFIG_USART3_TXBUFSIZE];
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#endif
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#ifdef SAMDL_HAVE_USART4
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static char g_usart4rxbuffer[CONFIG_USART4_RXBUFSIZE];
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static char g_usart4txbuffer[CONFIG_USART4_TXBUFSIZE];
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#endif
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#ifdef SAMDL_HAVE_USART5
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static char g_usart5rxbuffer[CONFIG_USART5_RXBUFSIZE];
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static char g_usart5txbuffer[CONFIG_USART5_TXBUFSIZE];
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#endif
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/* This describes the state of the USART0 port. */
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#ifdef SAMDL_HAVE_USART0
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static struct sam_dev_s g_usart0priv =
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{
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.config = &g_usart0config,
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.handler = sam_usart0_interrupt,
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};
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static uart_dev_t g_usart0port =
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{
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.recv =
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{
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.size = CONFIG_USART0_RXBUFSIZE,
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.buffer = g_usart0rxbuffer,
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},
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.xmit =
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{
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.size = CONFIG_USART0_TXBUFSIZE,
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.buffer = g_usart0txbuffer,
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},
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.ops = &g_uart_ops,
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.priv = &g_usart0priv,
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};
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#endif
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/* This describes the state of the USART1 port. */
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#ifdef SAMDL_HAVE_USART1
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static struct sam_dev_s g_usart1priv =
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{
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.config = &g_usart1config,
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.handler = sam_usart1_interrupt,
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};
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static uart_dev_t g_usart1port =
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{
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.recv =
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{
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.size = CONFIG_USART1_RXBUFSIZE,
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.buffer = g_usart1rxbuffer,
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},
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.xmit =
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{
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.size = CONFIG_USART1_TXBUFSIZE,
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.buffer = g_usart1txbuffer,
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},
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.ops = &g_uart_ops,
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.priv = &g_usart1priv,
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};
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#endif
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/* This describes the state of the USART2 port. */
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#ifdef SAMDL_HAVE_USART2
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static struct sam_dev_s g_usart2priv =
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{
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.config = &g_usart2config,
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.handler = sam_usart2_interrupt,
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};
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static uart_dev_t g_usart2port =
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{
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.recv =
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{
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.size = CONFIG_USART2_RXBUFSIZE,
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.buffer = g_usart2rxbuffer,
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},
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.xmit =
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{
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.size = CONFIG_USART2_TXBUFSIZE,
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.buffer = g_usart2txbuffer,
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},
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.ops = &g_uart_ops,
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.priv = &g_usart2priv,
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};
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#endif
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/* This describes the state of the USART3 port. */
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#ifdef SAMDL_HAVE_USART3
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static struct sam_dev_s g_usart3priv =
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{
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.config = &g_usart3config,
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.handler = sam_usart3_interrupt,
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};
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static uart_dev_t g_usart3port =
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{
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.recv =
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{
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.size = CONFIG_USART3_RXBUFSIZE,
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.buffer = g_usart3rxbuffer,
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},
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.xmit =
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{
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.size = CONFIG_USART3_TXBUFSIZE,
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.buffer = g_usart3txbuffer,
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},
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.ops = &g_uart_ops,
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.priv = &g_usart3priv,
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};
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#endif
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/* This describes the state of the USART4 port. */
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#ifdef SAMDL_HAVE_USART4
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static struct sam_dev_s g_usart4priv =
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{
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.config = &g_usart4config,
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.handler = sam_usart4_interrupt,
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};
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static uart_dev_t g_usart4port =
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{
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.recv =
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{
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.size = CONFIG_USART4_RXBUFSIZE,
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.buffer = g_usart4rxbuffer,
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},
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.xmit =
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{
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.size = CONFIG_USART4_TXBUFSIZE,
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.buffer = g_usart4txbuffer,
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},
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.ops = &g_uart_ops,
|
|
.priv = &g_usart4priv,
|
|
};
|
|
#endif
|
|
|
|
/* This describes the state of the USART5 port. */
|
|
|
|
#ifdef SAMDL_HAVE_USART5
|
|
static struct sam_dev_s g_usart5priv =
|
|
{
|
|
.config = &g_usart5config,
|
|
.handler = sam_usart5_interrupt,
|
|
};
|
|
|
|
static uart_dev_t g_usart5port =
|
|
{
|
|
.recv =
|
|
{
|
|
.size = CONFIG_USART5_RXBUFSIZE,
|
|
.buffer = g_usart5rxbuffer,
|
|
},
|
|
.xmit =
|
|
{
|
|
.size = CONFIG_USART5_TXBUFSIZE,
|
|
.buffer = g_usart5txbuffer,
|
|
},
|
|
.ops = &g_uart_ops,
|
|
.priv = &g_usart5priv,
|
|
};
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Private Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: sam_serialin8
|
|
****************************************************************************/
|
|
|
|
static inline uint8_t sam_serialin8(struct sam_dev_s *priv, int offset)
|
|
{
|
|
return getreg8(priv->config->base + offset);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_serialout8
|
|
****************************************************************************/
|
|
|
|
static inline void sam_serialout8(struct sam_dev_s *priv, int offset,
|
|
uint8_t regval)
|
|
{
|
|
putreg8(regval, priv->config->base + offset);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_serialin16
|
|
****************************************************************************/
|
|
|
|
static inline uint16_t sam_serialin16(struct sam_dev_s *priv, int offset)
|
|
{
|
|
return getreg16(priv->config->base + offset);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_serialout16
|
|
****************************************************************************/
|
|
|
|
static inline void sam_serialout16(struct sam_dev_s *priv, int offset,
|
|
uint16_t regval)
|
|
{
|
|
putreg16(regval, priv->config->base + offset);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_disableallints
|
|
****************************************************************************/
|
|
|
|
static void sam_disableallints(struct sam_dev_s *priv)
|
|
{
|
|
/* Disable all interrupts */
|
|
|
|
sam_serialout8(priv, SAM_USART_INTENCLR_OFFSET, USART_INT_ALL);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_interrupt
|
|
*
|
|
* Description:
|
|
* This is the USART interrupt handler. It will be invoked when an
|
|
* interrupt received on the 'irq' It should call uart_transmitchars or
|
|
* uart_receivechar to perform the appropriate data transfers. The
|
|
* interrupt handling logic must be able to map the 'irq' number into the
|
|
* approprite uart_dev_s structure in order to call these functions.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int sam_interrupt(struct uart_dev_s *dev)
|
|
{
|
|
struct sam_dev_s *priv = (struct sam_dev_s*)dev->priv;;
|
|
uint8_t pending;
|
|
uint8_t intflag;
|
|
uint8_t inten;
|
|
|
|
/* Get the set of pending USART interrupts (we are only interested in the
|
|
* unmasked interrupts).
|
|
*/
|
|
|
|
intflag = sam_serialin8(priv, SAM_USART_INTFLAG_OFFSET);
|
|
inten = sam_serialin8(priv, SAM_USART_INTENCLR_OFFSET);
|
|
pending = intflag & inten;
|
|
|
|
/* Handle an incoming, receive byte. The RXC flag is set when there is
|
|
* unread data in DATA register. This flag is cleared by reading the DATA
|
|
* register (or by disabling the receiver).
|
|
*/
|
|
|
|
if ((pending & USART_INT_RXC) != 0)
|
|
{
|
|
/* Received data ready... process incoming bytes */
|
|
|
|
uart_recvchars(dev);
|
|
}
|
|
|
|
/* Handle outgoing, transmit bytes. The DRE flag is set when the DATA
|
|
* register is empty and ready to be written. This flag is cleared by
|
|
* writing new data to the DATA register. If there is no further data to
|
|
* be transmitted, the serial driver will disable TX interrupts, prohibit
|
|
* further interrupts until TX interrupts are re-enabled.
|
|
*/
|
|
|
|
if ((pending & USART_INT_DRE) != 0)
|
|
{
|
|
/* Transmit data register empty ... process outgoing bytes */
|
|
|
|
uart_xmitchars(dev);
|
|
}
|
|
|
|
return OK;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_usartN_interrupt
|
|
*
|
|
* Description:
|
|
* Handle each SERCOM USART interrupt by calling the common interrupt
|
|
* handling logic with the USART-specific state.
|
|
*
|
|
****************************************************************************/
|
|
|
|
#ifdef SAMDL_HAVE_USART0
|
|
static int sam_usart0_interrupt(int irq, void *context)
|
|
{
|
|
return sam_interrupt(&g_usart0port);
|
|
}
|
|
#endif
|
|
|
|
#ifdef SAMDL_HAVE_USART1
|
|
static int sam_usart1_interrupt(int irq, void *context)
|
|
{
|
|
return sam_interrupt(&g_usart1port);
|
|
}
|
|
#endif
|
|
|
|
#ifdef SAMDL_HAVE_USART2
|
|
static int sam_usart2_interrupt(int irq, void *context)
|
|
{
|
|
return sam_interrupt(&g_usart2port);
|
|
}
|
|
#endif
|
|
|
|
#ifdef SAMDL_HAVE_USART3
|
|
static int sam_usart3_interrupt(int irq, void *context)
|
|
{
|
|
return sam_interrupt(&g_usart3port);
|
|
}
|
|
#endif
|
|
|
|
#ifdef SAMDL_HAVE_USART4
|
|
static int sam_usart4_interrupt(int irq, void *context)
|
|
{
|
|
return sam_interrupt(&g_usart4port);
|
|
}
|
|
#endif
|
|
|
|
#ifdef SAMDL_HAVE_USART5
|
|
static int sam_usart5_interrupt(int irq, void *context)
|
|
{
|
|
return sam_interrupt(&g_usart5port);
|
|
}
|
|
#endif
|
|
|
|
/****************************************************************************
|
|
* Name: sam_setup
|
|
*
|
|
* Description:
|
|
* Configure the USART baud, bits, parity, etc. This method is called the
|
|
* first time that the serial port is opened.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int sam_setup(struct uart_dev_s *dev)
|
|
{
|
|
int ret = 0;
|
|
#ifndef CONFIG_SUPPRESS_UART_CONFIG
|
|
struct sam_dev_s *priv = (struct sam_dev_s*)dev->priv;
|
|
|
|
/* Configure the SERCOM as a USART. Don't reconfigure the console UART;
|
|
* that was already done in sam_lowputc.c.
|
|
*/
|
|
|
|
if (!dev->isconsole)
|
|
{
|
|
ret = sam_usart_initialize(priv->config);
|
|
}
|
|
#endif
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_shutdown
|
|
*
|
|
* Description:
|
|
* Disable the USART. This method is called when the serial port is
|
|
* closed. The exception is the serial console which is never shutdown.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static void sam_shutdown(struct uart_dev_s *dev)
|
|
{
|
|
struct sam_dev_s *priv = (struct sam_dev_s*)dev->priv;
|
|
|
|
/* Resetting the SERCOM restores all registers to the reget state and
|
|
* disables the SERCOM. Ignore any requests to shutown the console
|
|
* device (shouldn't happen).
|
|
*/
|
|
|
|
if (!dev->isconsole)
|
|
{
|
|
sam_usart_reset(priv->config);
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_attach
|
|
*
|
|
* Description:
|
|
* Configure the USART to operation in interrupt driven mode. This method
|
|
* is called when the serial port is opened. Normally, this is just after
|
|
* the setup() method is called, however, the serial console may operate in
|
|
* a non-interrupt driven mode during the boot phase.
|
|
*
|
|
* RX and TX interrupts are not enabled when by the attach method (unless
|
|
* the hardware supports multiple levels of interrupt enabling). The RX
|
|
* and TX interrupts are not enabled until the txint() and rxint() methods
|
|
* are called.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int sam_attach(struct uart_dev_s *dev)
|
|
{
|
|
struct sam_dev_s *priv = (struct sam_dev_s*)dev->priv;
|
|
const struct sam_usart_config_s * const config = priv->config;
|
|
int ret;
|
|
|
|
/* Attach and enable the IRQ */
|
|
|
|
ret = irq_attach(config->irq, priv->handler);
|
|
if (ret == OK)
|
|
{
|
|
/* Enable the interrupt (RX and TX interrupts are still disabled
|
|
* in the USART
|
|
*/
|
|
|
|
up_enable_irq(config->irq);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_detach
|
|
*
|
|
* Description:
|
|
* Detach USART interrupts. This method is called when the serial port is
|
|
* closed normally just before the shutdown method is called. The
|
|
* exception is the serial console which is never shutdown.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static void sam_detach(struct uart_dev_s *dev)
|
|
{
|
|
struct sam_dev_s *priv = (struct sam_dev_s*)dev->priv;
|
|
const struct sam_usart_config_s * const config = priv->config;
|
|
|
|
/* Disable interrupts at the SERCOM device and at the NVIC */
|
|
|
|
sam_disableallints(priv);
|
|
up_disable_irq(config->irq);
|
|
|
|
/* Detach the interrupt handler */
|
|
|
|
irq_detach(config->irq);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_ioctl
|
|
*
|
|
* Description:
|
|
* All ioctl calls will be routed through this method
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int sam_ioctl(struct file *filep, int cmd, unsigned long arg)
|
|
{
|
|
#ifdef CONFIG_SERIAL_TIOCSERGSTRUCT
|
|
struct inode *inode = filep->f_inode;
|
|
struct uart_dev_s *dev = inode->i_private;
|
|
#endif
|
|
int ret = OK;
|
|
|
|
switch (cmd)
|
|
{
|
|
#ifdef CONFIG_SERIAL_TIOCSERGSTRUCT
|
|
case TIOCSERGSTRUCT:
|
|
{
|
|
struct sam_dev_s *user = (struct sam_dev_s*)arg;
|
|
if (!user)
|
|
{
|
|
ret = -EINVAL;
|
|
}
|
|
else
|
|
{
|
|
memcpy(user, dev, sizeof(struct sam_dev_s));
|
|
}
|
|
}
|
|
break;
|
|
#endif
|
|
|
|
default:
|
|
ret = -ENOTTY;
|
|
break;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_receive
|
|
*
|
|
* Description:
|
|
* Called (usually) from the interrupt level to receive one
|
|
* character from the USART. Error bits associated with the
|
|
* receipt are provided in the return 'status'.
|
|
*
|
|
****************************************************************************/
|
|
|
|
static int sam_receive(struct uart_dev_s *dev, uint32_t *status)
|
|
{
|
|
struct sam_dev_s *priv = (struct sam_dev_s*)dev->priv;
|
|
|
|
/* Return read status */
|
|
|
|
*status = (uint32_t)sam_serialin16(priv, SAM_USART_STATUS_OFFSET);
|
|
|
|
/* Then return the actual received byte */
|
|
|
|
return (int)sam_serialin16(priv, SAM_USART_DATA_OFFSET);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_rxint
|
|
*
|
|
* Description:
|
|
* Call to enable or disable RXRDY interrupts
|
|
*
|
|
****************************************************************************/
|
|
|
|
static void sam_rxint(struct uart_dev_s *dev, bool enable)
|
|
{
|
|
struct sam_dev_s *priv = (struct sam_dev_s*)dev->priv;
|
|
|
|
if (enable)
|
|
{
|
|
/* Receive an interrupt when their is anything in the Rx data register */
|
|
|
|
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
|
|
sam_serialout8(priv, SAM_USART_INTENSET_OFFSET, USART_INT_RXC);
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
sam_serialout8(priv, SAM_USART_INTENCLR_OFFSET, USART_INT_RXC);
|
|
}
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_rxavailable
|
|
*
|
|
* Description:
|
|
* Return true if the receive holding register is not empty
|
|
*
|
|
****************************************************************************/
|
|
|
|
static bool sam_rxavailable(struct uart_dev_s *dev)
|
|
{
|
|
struct sam_dev_s *priv = (struct sam_dev_s*)dev->priv;
|
|
return ((sam_serialin8(priv, SAM_USART_INTFLAG_OFFSET) & USART_INT_RXC) != 0);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_send
|
|
*
|
|
* Description:
|
|
* This method will send one byte on the USART
|
|
*
|
|
****************************************************************************/
|
|
|
|
static void sam_send(struct uart_dev_s *dev, int ch)
|
|
{
|
|
struct sam_dev_s *priv = (struct sam_dev_s*)dev->priv;
|
|
sam_serialout16(priv, SAM_USART_DATA_OFFSET, (uint16_t)ch);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_txint
|
|
*
|
|
* Description:
|
|
* Call to enable or disable TX interrupts
|
|
*
|
|
****************************************************************************/
|
|
|
|
static void sam_txint(struct uart_dev_s *dev, bool enable)
|
|
{
|
|
struct sam_dev_s *priv = (struct sam_dev_s*)dev->priv;
|
|
irqstate_t flags;
|
|
|
|
flags = irqsave();
|
|
if (enable)
|
|
{
|
|
/* Set to receive an interrupt when the TX holding register register
|
|
* is empty
|
|
*/
|
|
|
|
#ifndef CONFIG_SUPPRESS_SERIAL_INTS
|
|
sam_serialout8(priv, SAM_USART_INTENSET_OFFSET, USART_INT_DRE);
|
|
|
|
/* Fake a TX interrupt here by just calling uart_xmitchars() with
|
|
* interrupts disabled (note this may recurse).
|
|
*/
|
|
|
|
uart_xmitchars(dev);
|
|
|
|
#endif
|
|
}
|
|
else
|
|
{
|
|
/* Disable the TX interrupt */
|
|
|
|
sam_serialout8(priv, SAM_USART_INTENCLR_OFFSET, USART_INT_DRE);
|
|
}
|
|
|
|
irqrestore(flags);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: sam_txempty
|
|
*
|
|
* Description:
|
|
* Return true if the transmit holding and shift registers are empty
|
|
*
|
|
****************************************************************************/
|
|
|
|
static bool sam_txempty(struct uart_dev_s *dev)
|
|
{
|
|
struct sam_dev_s *priv = (struct sam_dev_s*)dev->priv;
|
|
return ((sam_serialin8(priv, SAM_USART_INTFLAG_OFFSET) & USART_INT_DRE) != 0);
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Public Functions
|
|
****************************************************************************/
|
|
|
|
/****************************************************************************
|
|
* Name: up_earlyserialinit
|
|
*
|
|
* Description:
|
|
* Performs the low level USART initialization early in debug so that the
|
|
* serial console will be available during bootup. This must be called
|
|
* before sam_serialinit.
|
|
*
|
|
* NOTE: On this platform up_earlyserialinit() does not really do
|
|
* anything of consequence and probably could be eliminated with little
|
|
* effort.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void up_earlyserialinit(void)
|
|
{
|
|
/* Disable all USARTS */
|
|
|
|
sam_disableallints(TTYS0_DEV.priv);
|
|
#ifdef TTYS1_DEV
|
|
sam_disableallints(TTYS1_DEV.priv);
|
|
#endif
|
|
#ifdef TTYS2_DEV
|
|
sam_disableallints(TTYS2_DEV.priv);
|
|
#endif
|
|
#ifdef TTYS3_DEV
|
|
sam_disableallints(TTYS3_DEV.priv);
|
|
#endif
|
|
#ifdef TTYS4_DEV
|
|
sam_disableallints(TTYS4_DEV.priv);
|
|
#endif
|
|
#ifdef TTYS5_DEV
|
|
sam_disableallints(TTYS5_DEV.priv);
|
|
#endif
|
|
|
|
#ifdef HAVE_SERIAL_CONSOLE
|
|
/* Mark the serial console (if any) */
|
|
|
|
CONSOLE_DEV.isconsole = true;
|
|
#endif
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: up_serialinit
|
|
*
|
|
* Description:
|
|
* Register serial console and serial ports. This assumes
|
|
* that sam_earlyserialinit was called previously.
|
|
*
|
|
****************************************************************************/
|
|
|
|
void up_serialinit(void)
|
|
{
|
|
/* Register the console */
|
|
|
|
#ifdef HAVE_SERIAL_CONSOLE
|
|
(void)uart_register("/dev/console", &CONSOLE_DEV);
|
|
#endif
|
|
|
|
/* Register all USARTs */
|
|
|
|
(void)uart_register("/dev/ttyS0", &TTYS0_DEV);
|
|
#ifdef TTYS1_DEV
|
|
(void)uart_register("/dev/ttyS1", &TTYS1_DEV);
|
|
#endif
|
|
#ifdef TTYS2_DEV
|
|
(void)uart_register("/dev/ttyS2", &TTYS2_DEV);
|
|
#endif
|
|
#ifdef TTYS3_DEV
|
|
(void)uart_register("/dev/ttyS3", &TTYS3_DEV);
|
|
#endif
|
|
#ifdef TTYS4_DEV
|
|
(void)uart_register("/dev/ttyS4", &TTYS4_DEV);
|
|
#endif
|
|
#ifdef TTYS5_DEV
|
|
(void)uart_register("/dev/ttyS5", &TTYS5_DEV);
|
|
#endif
|
|
}
|
|
|
|
/****************************************************************************
|
|
* Name: up_putc
|
|
*
|
|
* Description:
|
|
* Provide priority, low-level access to support OS debug writes
|
|
*
|
|
****************************************************************************/
|
|
|
|
int up_putc(int ch)
|
|
{
|
|
#ifdef HAVE_SERIAL_CONSOLE
|
|
irqstate_t flags;
|
|
|
|
/* All interrupts must be disabled to prevent re-entrancy and to prevent
|
|
* interrupts from firing in the serial driver code.
|
|
*/
|
|
|
|
flags = irqsave();
|
|
|
|
/* Check for LF */
|
|
|
|
if (ch == '\n')
|
|
{
|
|
/* Add CR */
|
|
|
|
sam_lowputc('\r');
|
|
}
|
|
|
|
sam_lowputc(ch);
|
|
irqrestore(flags);
|
|
#endif
|
|
return ch;
|
|
}
|
|
|
|
#else /* USE_SERIALDRIVER */
|
|
|
|
/****************************************************************************
|
|
* Name: up_putc
|
|
*
|
|
* Description:
|
|
* Provide priority, low-level access to support OS debug writes
|
|
*
|
|
****************************************************************************/
|
|
|
|
int up_putc(int ch)
|
|
{
|
|
#ifdef HAVE_SERIAL_CONSOLE
|
|
/* Check for LF */
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|
|
|
if (ch == '\n')
|
|
{
|
|
/* Add CR */
|
|
|
|
sam_lowputc('\r');
|
|
}
|
|
|
|
sam_lowputc(ch);
|
|
#endif
|
|
return ch;
|
|
}
|
|
|
|
#endif /* USE_SERIALDRIVER */
|
|
#endif /* SAMDL_HAVE_USART */
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|
|