From 4aa7ba827bc7a5bf7bdb8d48dcfb844422c6ed50 Mon Sep 17 00:00:00 2001
From: David Sidrane <David.Sidrane@NscDg.com>
Date: Thu, 3 Dec 2020 06:09:41 -0800
Subject: [PATCH] imxrt:imxrt_lowputc Fixed parity settings.

      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.
---
 arch/arm/src/imxrt/imxrt_lowputc.c | 56 ++++++++++++------------------
 1 file changed, 22 insertions(+), 34 deletions(-)

diff --git a/arch/arm/src/imxrt/imxrt_lowputc.c b/arch/arm/src/imxrt/imxrt_lowputc.c
index ee826b8ab96..682d1fec91e 100644
--- a/arch/arm/src/imxrt/imxrt_lowputc.c
+++ b/arch/arm/src/imxrt/imxrt_lowputc.c
@@ -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.