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imxrt:serial support single-wire mode
This commit is contained in:
David Sidrane
committed by
Brennan Ashton
Brennan Ashton
parent
4aa7ba827b
commit
b73026ee55
@@ -419,6 +419,14 @@ config IMXRT_LPUART_INVERT
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Enable signal inversion UART support. The option enables support for the
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TIOCSINVERT ioctl in the IMXRT serial driver.
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config IMXRT_LPUART_SINGLEWIRE
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bool "Single Wire Support"
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default n
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depends on IMXRT_HAVE_LPUART
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---help---
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Enable single wire UART support. The option enables support for the
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TIOCSSINGLEWIRE ioctl in the IMXRT serial driver.
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endmenu # LPUART Configuration
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menu "FLEXCAN Peripherals"
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@@ -1,35 +1,20 @@
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/****************************************************************************
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* arch/arm/src/imxrt/imxrt_serial.c
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*
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* Copyright (C) 2018, 2019 Gregory Nutt. All rights reserved.
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* Author: Ivan Ucherdzhiev <ivanucherdjiev@gmail.com>
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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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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* http://www.apache.org/licenses/LICENSE-2.0
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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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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*
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****************************************************************************/
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@@ -334,6 +319,9 @@ struct imxrt_uart_s
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#ifdef CONFIG_SERIAL_OFLOWCONTROL
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const uint32_t cts_gpio; /* U[S]ART CTS GPIO pin configuration */
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#endif
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#ifdef CONFIG_IMXRT_LPUART_SINGLEWIRE
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const uint32_t tx_gpio; /* TX GPIO pin configuration */
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#endif
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uint8_t stopbits2:1; /* 1: Configure with 2 stop bits vs 1 */
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#ifdef CONFIG_SERIAL_IFLOWCONTROL
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@@ -470,6 +458,9 @@ static struct imxrt_uart_s g_uart1priv =
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|| (defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_LPUART1_IFLOWCONTROL)))
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.rts_gpio = GPIO_LPUART1_RTS,
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#endif
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#ifdef CONFIG_IMXRT_LPUART_SINGLEWIRE
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.tx_gpio = GPIO_LPUART1_TX,
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#endif
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#if (((defined(CONFIG_SERIAL_RS485CONTROL) || defined(CONFIG_SERIAL_IFLOWCONTROL))) \
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&& defined(CONFIG_LPUART1_INVERTIFLOWCONTROL))
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@@ -520,6 +511,9 @@ static struct imxrt_uart_s g_uart2priv =
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|| (defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_LPUART2_IFLOWCONTROL)))
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.rts_gpio = GPIO_LPUART2_RTS,
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#endif
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#ifdef CONFIG_IMXRT_LPUART_SINGLEWIRE
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.tx_gpio = GPIO_LPUART2_TX,
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#endif
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#if (((defined(CONFIG_SERIAL_RS485CONTROL) || defined(CONFIG_SERIAL_IFLOWCONTROL))) \
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&& defined(CONFIG_LPUART2_INVERTIFLOWCONTROL))
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.inviflow = 1,
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@@ -567,6 +561,9 @@ static struct imxrt_uart_s g_uart3priv =
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|| (defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_LPUART3_IFLOWCONTROL)))
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.rts_gpio = GPIO_LPUART3_RTS,
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#endif
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#ifdef CONFIG_IMXRT_LPUART_SINGLEWIRE
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.tx_gpio = GPIO_LPUART3_TX,
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#endif
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#if (((defined(CONFIG_SERIAL_RS485CONTROL) || defined(CONFIG_SERIAL_IFLOWCONTROL))) \
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&& defined(CONFIG_LPUART3_INVERTIFLOWCONTROL))
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.inviflow = 1,
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@@ -614,6 +611,9 @@ static struct imxrt_uart_s g_uart4priv =
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|| (defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_LPUART4_IFLOWCONTROL)))
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.rts_gpio = GPIO_LPUART4_RTS,
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#endif
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#ifdef CONFIG_IMXRT_LPUART_SINGLEWIRE
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.tx_gpio = GPIO_LPUART4_TX,
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#endif
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#if (((defined(CONFIG_SERIAL_RS485CONTROL) || defined(CONFIG_SERIAL_IFLOWCONTROL))) \
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&& defined(CONFIG_LPUART4_INVERTIFLOWCONTROL))
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.inviflow = 1,
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@@ -661,6 +661,9 @@ static struct imxrt_uart_s g_uart5priv =
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|| (defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_LPUART5_IFLOWCONTROL)))
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.rts_gpio = GPIO_LPUART5_RTS,
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#endif
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#ifdef CONFIG_IMXRT_LPUART_SINGLEWIRE
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.tx_gpio = GPIO_LPUART5_TX,
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#endif
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#if (((defined(CONFIG_SERIAL_RS485CONTROL) || defined(CONFIG_SERIAL_IFLOWCONTROL))) \
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&& defined(CONFIG_LPUART5_INVERTIFLOWCONTROL))
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.inviflow = 1,
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@@ -708,6 +711,9 @@ static struct imxrt_uart_s g_uart6priv =
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|| (defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_LPUART6_IFLOWCONTROL)))
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.rts_gpio = GPIO_LPUART6_RTS,
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#endif
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#ifdef CONFIG_IMXRT_LPUART_SINGLEWIRE
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.tx_gpio = GPIO_LPUART6_TX,
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#endif
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#if (((defined(CONFIG_SERIAL_RS485CONTROL) || defined(CONFIG_SERIAL_IFLOWCONTROL))) \
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&& defined(CONFIG_LPUART6_INVERTIFLOWCONTROL))
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.inviflow = 1,
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@@ -755,6 +761,9 @@ static struct imxrt_uart_s g_uart7priv =
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|| (defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_LPUART7_IFLOWCONTROL)))
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.rts_gpio = GPIO_LPUART7_RTS,
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#endif
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#ifdef CONFIG_IMXRT_LPUART_SINGLEWIRE
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.tx_gpio = GPIO_LPUART7_TX,
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#endif
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#if (((defined(CONFIG_SERIAL_RS485CONTROL) || defined(CONFIG_SERIAL_IFLOWCONTROL))) \
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&& defined(CONFIG_LPUART7_INVERTIFLOWCONTROL))
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.inviflow = 1,
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@@ -802,6 +811,9 @@ static struct imxrt_uart_s g_uart8priv =
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|| (defined(CONFIG_SERIAL_IFLOWCONTROL) && defined(CONFIG_LPUART8_IFLOWCONTROL)))
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.rts_gpio = GPIO_LPUART8_RTS,
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#endif
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#ifdef CONFIG_IMXRT_LPUART_SINGLEWIRE
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.tx_gpio = GPIO_LPUART8_TX,
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#endif
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#if (((defined(CONFIG_SERIAL_RS485CONTROL) || defined(CONFIG_SERIAL_IFLOWCONTROL))) \
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&& defined(CONFIG_LPUART8_INVERTIFLOWCONTROL))
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.inviflow = 1,
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@@ -1315,6 +1327,44 @@ static int imxrt_ioctl(struct file *filep, int cmd, unsigned long arg)
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break;
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#endif /* CONFIG_SERIAL_TERMIOS */
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#ifdef CONFIG_IMXRT_LPUART_SINGLEWIRE
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case TIOCSSINGLEWIRE:
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{
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uint32_t regval;
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irqstate_t flags;
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struct imxrt_uart_s *priv = (struct imxrt_uart_s *)dev->priv;
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flags = spin_lock_irqsave();
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regval = imxrt_serialin(priv, IMXRT_LPUART_CTRL_OFFSET);
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if ((arg & SER_SINGLEWIRE_ENABLED) != 0)
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{
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uint32_t gpio_val = IOMUX_OPENDRAIN;
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gpio_val |= (arg & SER_SINGLEWIRE_PULL_MASK) ==
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SER_SINGLEWIRE_PULLUP ?
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IOMUX_PULL_UP_47K : IOMUX_PULL_NONE;
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gpio_val |= (arg & SER_SINGLEWIRE_PULL_MASK) ==
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SER_SINGLEWIRE_PULLDOWN ?
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IOMUX_PULL_DOWN_100K : IOMUX_PULL_NONE;
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imxrt_config_gpio((priv->tx_gpio &
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~(IOMUX_PULL_MASK | IOMUX_OPENDRAIN)) | gpio_val);
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regval |= LPUART_CTRL_LOOPS | LPUART_CTRL_RSRC;
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}
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else
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{
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imxrt_config_gpio((priv->tx_gpio & ~(IOMUX_PULL_MASK |
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IOMUX_OPENDRAIN)) |
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IOMUX_PULL_NONE);
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regval &= ~(LPUART_CTRL_LOOPS | LPUART_CTRL_RSRC);
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}
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imxrt_serialout(priv, IMXRT_LPUART_CTRL_OFFSET, regval);
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spin_unlock_irqrestore(flags);
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}
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break;
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#endif
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#ifdef CONFIG_IMXRT_LPUART_INVERT
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case TIOCSINVERT:
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{
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