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imxrt:imxrt_lowputc Fixed parity settings.

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imxrt UART must be placed in 9 bit mode (M=1) with when 8 bit
      data with parity is required. If left in 8 bit mode (M=0) with
      parity then D7 of the TX/RX register becomes parity bit. Hence
      what is called 9-bit or 8-bit Mode Select is a misnomer.
      8 bit mode when parity is enabled is realy 7 bit with parity.
This commit is contained in:
David Sidrane 2020-12-03 06:09:41 -08:00 committed by Brennan Ashton
parent e4c725481c
commit 4aa7ba827b
1 changed files with 22 additions and 34 deletions
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56
arch/arm/src/imxrt/imxrt_lowputc.c
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@ -1,35 +1,20 @@
/****************************************************************************
* arch/arm/src/imxrt/imxrt_lowputc.c
*
* Copyright (C) 2018, 2019 Gregory Nutt. All rights reserved.
* Author: Ivan Ucherdzhiev <ivanucherdjiev@gmail.com>
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership. The
* ASF licenses this file to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance with the
* License. You may obtain a copy of the License at
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* http://www.apache.org/licenses/LICENSE-2.0
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations
* under the License.
*
****************************************************************************/
@ -544,14 +529,14 @@ int imxrt_lpuart_configure(uint32_t base,
regval |= LPUART_CTRL_PE | LPUART_CTRL_PT_EVEN;
}
if (config->bits == 8)
{
regval &= ~LPUART_CTRL_M;
}
else if (config->bits == 9)
if (config->bits == 9 || (config->bits == 8 && config->parity != 0))
{
regval |= LPUART_CTRL_M;
}
else if ((config->bits == 8))
{
regval &= ~LPUART_CTRL_M;
}
else
{
/* Here should be added support of other bit modes. */
@ -590,13 +575,16 @@ void imxrt_lowputc(int ch)
{
}
/* If the character to output is a newline, then pre-pend a carriage return */
/* If the character to output is a newline, then pre-pend a carriage
* return
*/
if (ch == '\n')
{
/* Send the carriage return by writing it into the UART_TXD register. */
putreg32((uint32_t)'\r', IMXRT_CONSOLE_BASE + IMXRT_LPUART_DATA_OFFSET);
putreg32((uint32_t)'\r', IMXRT_CONSOLE_BASE +
IMXRT_LPUART_DATA_OFFSET);
/* Wait for the transmit register to be emptied. When the TXFE bit is
* non-zero, the TX Buffer FIFO is empty.