447 lines
14 KiB
C
447 lines
14 KiB
C
/****************************************************************************
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* arch/arm/src/samv7/sam_lowputc.c
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*
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* Copyright (C) 2015-2016 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 <stdint.h>
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#include <nuttx/irq.h>
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#include <arch/board/board.h>
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#include "up_internal.h"
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#include "up_arch.h"
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#include "sam_config.h"
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#include "sam_gpio.h"
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#include "sam_periphclks.h"
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#include "sam_lowputc.h"
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#include "chip/sam_uart.h"
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#include "chip/sam_pinmap.h"
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#include "chip/sam_matrix.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Configuration **********************************************************/
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#ifdef HAVE_SERIAL_CONSOLE
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/* BAUD definitions
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*
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* The source clock is selectable and could be one of:
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*
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* - The peripheral clock
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* - A division of the peripheral clock, where the divider is product-
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* dependent, but generally set to 8
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* - A processor/peripheral independent clock source fully programmable
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* provided by PMC (PCK)
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* - The external clock, available on the SCK pin
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*
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* Only the first two options are supported by this driver. The divided
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* peripheral clock is only used for very low BAUD selections.
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*/
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#define FAST_USART_CLOCK BOARD_MCK_FREQUENCY
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#define SLOW_USART_CLOCK (BOARD_MCK_FREQUENCY >> 3)
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/* Select USART parameters for the selected console */
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# if defined(CONFIG_UART0_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_UART0_BASE
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# define SAM_CONSOLE_BAUD CONFIG_UART0_BAUD
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# define SAM_CONSOLE_BITS CONFIG_UART0_BITS
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# define SAM_CONSOLE_PARITY CONFIG_UART0_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_UART0_2STOP
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# elif defined(CONFIG_UART1_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_UART1_BASE
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# define SAM_CONSOLE_BAUD CONFIG_UART1_BAUD
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# define SAM_CONSOLE_BITS CONFIG_UART1_BITS
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# define SAM_CONSOLE_PARITY CONFIG_UART1_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_UART1_2STOP
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# elif defined(CONFIG_UART2_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_UART2_BASE
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# define SAM_CONSOLE_BAUD CONFIG_UART2_BAUD
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# define SAM_CONSOLE_BITS CONFIG_UART2_BITS
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# define SAM_CONSOLE_PARITY CONFIG_UART2_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_UART2_2STOP
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# elif defined(CONFIG_UART3_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_UART3_BASE
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# define SAM_CONSOLE_BAUD CONFIG_UART3_BAUD
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# define SAM_CONSOLE_BITS CONFIG_UART3_BITS
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# define SAM_CONSOLE_PARITY CONFIG_UART3_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_UART3_2STOP
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# elif defined(CONFIG_UART4_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_UART4_BASE
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# define SAM_CONSOLE_BAUD CONFIG_UART4_BAUD
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# define SAM_CONSOLE_BITS CONFIG_UART4_BITS
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# define SAM_CONSOLE_PARITY CONFIG_UART4_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_UART4_2STOP
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# elif defined(CONFIG_USART0_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_USART0_BASE
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# define SAM_CONSOLE_BAUD CONFIG_USART0_BAUD
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# define SAM_CONSOLE_BITS CONFIG_USART0_BITS
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# define SAM_CONSOLE_PARITY CONFIG_USART0_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_USART0_2STOP
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# elif defined(CONFIG_USART1_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_USART1_BASE
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# define SAM_CONSOLE_BAUD CONFIG_USART1_BAUD
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# define SAM_CONSOLE_BITS CONFIG_USART1_BITS
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# define SAM_CONSOLE_PARITY CONFIG_USART1_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_USART1_2STOP
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# elif defined(CONFIG_USART2_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_USART2_BASE
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# define SAM_CONSOLE_BAUD CONFIG_USART2_BAUD
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# define SAM_CONSOLE_BITS CONFIG_USART2_BITS
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# define SAM_CONSOLE_PARITY CONFIG_USART2_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_USART2_2STOP
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# else
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# error "No CONFIG_U[S]ARTn_SERIAL_CONSOLE Setting"
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# endif
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/* Select the settings for the mode register */
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# if SAM_CONSOLE_BITS == 5
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# define MR_CHRL_VALUE UART_MR_CHRL_5BITS /* 5 bits */
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# elif SAM_CONSOLE_BITS == 6
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# define MR_CHRL_VALUE UART_MR_CHRL_6BITS /* 6 bits */
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# elif SAM_CONSOLE_BITS == 7
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# define MR_CHRL_VALUE UART_MR_CHRL_7BITS /* 7 bits */
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# elif SAM_CONSOLE_BITS == 8
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# define MR_CHRL_VALUE UART_MR_CHRL_8BITS /* 8 bits */
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# elif SAM_CONSOLE_BITS == 9 && !defined(CONFIG_UART0_SERIAL_CONSOLE) && \
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!defined(CONFIG_UART1_SERIAL_CONSOLE)
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# define MR_CHRL_VALUE UART_MR_MODE9
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# else
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# error "Invalid number of bits"
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# endif
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# if SAM_CONSOLE_PARITY == 1
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# define MR_PAR_VALUE UART_MR_PAR_ODD
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# elif SAM_CONSOLE_PARITY == 2
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# define MR_PAR_VALUE UART_MR_PAR_EVEN
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# else
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# define MR_PAR_VALUE UART_MR_PAR_NONE
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# endif
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# if SAM_CONSOLE_2STOP != 0
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# define MR_NBSTOP_VALUE UART_MR_NBSTOP_2
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# else
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# define MR_NBSTOP_VALUE UART_MR_NBSTOP_1
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# endif
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# define MR_VALUE (UART_MR_MODE_NORMAL | UART_MR_USCLKS_MCK | \
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MR_CHRL_VALUE | MR_PAR_VALUE | MR_NBSTOP_VALUE)
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#endif /* HAVE_SERIAL_CONSOLE */
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: up_lowputc
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*
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* Description:
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* Output one byte on the serial console
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*
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****************************************************************************/
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void up_lowputc(char ch)
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{
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#ifdef HAVE_SERIAL_CONSOLE
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irqstate_t flags;
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for (; ; )
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{
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/* Wait for the transmitter to be available */
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while ((getreg32(SAM_CONSOLE_BASE + SAM_UART_SR_OFFSET) &
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UART_INT_TXEMPTY) == 0);
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/* Disable interrupts so that the test and the transmission are
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* atomic.
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*/
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flags = enter_critical_section();
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if ((getreg32(SAM_CONSOLE_BASE + SAM_UART_SR_OFFSET) &
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UART_INT_TXEMPTY) != 0)
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{
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/* Send the character */
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putreg32((uint32_t)ch, SAM_CONSOLE_BASE + SAM_UART_THR_OFFSET);
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leave_critical_section(flags);
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return;
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}
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leave_critical_section(flags);
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}
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#endif
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}
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/****************************************************************************
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* Name: up_putc
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*
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* Description:
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* Provide priority, low-level access to support OS debug writes
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*
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****************************************************************************/
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int up_putc(int ch)
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{
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#ifdef HAVE_SERIAL_CONSOLE
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/* Check for LF */
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if (ch == '\n')
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{
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/* Add CR */
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up_lowputc('\r');
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}
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up_lowputc(ch);
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#endif
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return ch;
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}
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/****************************************************************************
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* Name: sam_lowsetup
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*
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* Description:
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* This performs basic initialization of the USART used for the serial
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* console. Its purpose is to get the console output availabe as soon
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* as possible.
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*
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****************************************************************************/
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void sam_lowsetup(void)
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{
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#if defined(HAVE_SERIAL_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
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uint64_t divb3;
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uint32_t intpart;
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uint32_t fracpart;
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uint32_t regval;
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#endif
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/* Enable clocking for all selected UART/USARTs */
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#ifdef CONFIG_SAMV7_UART0
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sam_uart0_enableclk();
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#endif
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#ifdef CONFIG_SAMV7_UART1
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sam_uart1_enableclk();
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#endif
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#ifdef CONFIG_SAMV7_UART2
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sam_uart2_enableclk();
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#endif
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#ifdef CONFIG_SAMV7_UART3
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sam_uart3_enableclk();
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#endif
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#ifdef CONFIG_SAMV7_UART4
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sam_uart4_enableclk();
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#endif
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#ifdef CONFIG_SAMV7_USART0
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sam_usart0_enableclk();
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#endif
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#ifdef CONFIG_SAMV7_USART1
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sam_usart1_enableclk();
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#endif
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#ifdef CONFIG_SAMV7_USART2
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sam_usart2_enableclk();
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#endif
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/* Configure UART pins for all selected UART/USARTs */
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#ifdef CONFIG_SAMV7_UART0
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(void)sam_configgpio(GPIO_UART0_RXD);
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(void)sam_configgpio(GPIO_UART0_TXD);
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#endif
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#ifdef CONFIG_SAMV7_UART1
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(void)sam_configgpio(GPIO_UART1_RXD);
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(void)sam_configgpio(GPIO_UART1_TXD);
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#endif
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#ifdef CONFIG_SAMV7_UART2
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(void)sam_configgpio(GPIO_UART2_RXD);
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(void)sam_configgpio(GPIO_UART2_TXD);
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#endif
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#ifdef CONFIG_SAMV7_UART3
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(void)sam_configgpio(GPIO_UART3_RXD);
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(void)sam_configgpio(GPIO_UART3_TXD);
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#endif
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#ifdef CONFIG_SAMV7_UART4
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(void)sam_configgpio(GPIO_UART4_RXD);
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(void)sam_configgpio(GPIO_UART4_TXD);
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#endif
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#ifdef CONFIG_SAMV7_USART0
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(void)sam_configgpio(GPIO_USART0_RXD);
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(void)sam_configgpio(GPIO_USART0_TXD);
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#ifdef CONFIG_USART0_OFLOWCONTROL
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(void)sam_configgpio(GPIO_USART0_CTS);
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#endif
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#ifdef CONFIG_USART0_IFLOWCONTROL
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(void)sam_configgpio(GPIO_USART0_RTS);
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#endif
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#endif
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#ifdef CONFIG_SAMV7_USART1
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(void)sam_configgpio(GPIO_USART1_RXD);
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(void)sam_configgpio(GPIO_USART1_TXD);
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# ifdef CONFIG_USART1_OFLOWCONTROL
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(void)sam_configgpio(GPIO_USART1_CTS);
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# endif
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# ifdef CONFIG_USART1_IFLOWCONTROL
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(void)sam_configgpio(GPIO_USART1_RTS);
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# endif
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/* To use the USART1 as an USART, the SYSIO Pin4 must be bound to PB4
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* instead of TDI
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*/
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# if defined(CONFIG_SAMV7_JTAG_FULL_ENABLE)
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# warning CONFIG_SAMV7_JTAG_FULL_ENABLE is incompatible with CONFIG_SAMV7_USART1.
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# warning The SYSIO Pin4 must be bound to PB4 to use USART1
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# endif
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uint32_t sysioreg = getreg32(SAM_MATRIX_CCFG_SYSIO);
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sysioreg |= MATRIX_CCFG_SYSIO_SYSIO4;
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putreg32(sysioreg, SAM_MATRIX_CCFG_SYSIO);
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#endif
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#ifdef CONFIG_SAMV7_USART2
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(void)sam_configgpio(GPIO_USART2_RXD);
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(void)sam_configgpio(GPIO_USART2_TXD);
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#ifdef CONFIG_USART2_OFLOWCONTROL
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(void)sam_configgpio(GPIO_USART2_CTS);
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#endif
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#ifdef CONFIG_USART2_IFLOWCONTROL
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(void)sam_configgpio(GPIO_USART2_RTS);
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#endif
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#endif
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/* Configure the console (only) */
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#if defined(HAVE_SERIAL_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
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/* Reset and disable receiver and transmitter */
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putreg32((UART_CR_RSTRX | UART_CR_RSTTX | UART_CR_RXDIS | UART_CR_TXDIS),
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SAM_CONSOLE_BASE + SAM_UART_CR_OFFSET);
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/* Disable all interrupts */
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putreg32(0xffffffff, SAM_CONSOLE_BASE + SAM_UART_IDR_OFFSET);
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/* Set up the mode register */
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putreg32(MR_VALUE, SAM_CONSOLE_BASE + SAM_UART_MR_OFFSET);
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/* Configure the console baud:
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*
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* Fbaud = USART_CLOCK / (16 * divisor)
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* divisor = USART_CLOCK / (16 * Fbaud)
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*
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* NOTE: Oversampling by 8 is not supported. This may limit BAUD rates
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* for lower USART clocks.
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*/
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divb3 = ((FAST_USART_CLOCK + (SAM_CONSOLE_BAUD << 3)) << 3) /
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(SAM_CONSOLE_BAUD << 4);
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intpart = (divb3 >> 3);
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fracpart = (divb3 & 7);
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/* Retain the fast MR peripheral clock UNLESS unless using that clock
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* would result in an excessively large divider.
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*
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* REVISIT: The fractional divider is not used.
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*/
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if ((intpart & ~UART_BRGR_CD_MASK) != 0)
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{
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/* Use the divided USART clock */
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divb3 = ((SLOW_USART_CLOCK + (SAM_CONSOLE_BAUD << 3)) << 3) /
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(SAM_CONSOLE_BAUD << 4);
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intpart = (divb3 >> 3);
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fracpart = (divb3 & 7);
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/* Re-select the clock source */
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regval = getreg32(SAM_CONSOLE_BASE + SAM_UART_MR_OFFSET);
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regval &= ~UART_MR_USCLKS_MASK;
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regval |= UART_MR_USCLKS_MCKDIV;
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putreg32(regval, SAM_CONSOLE_BASE + SAM_UART_MR_OFFSET);
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}
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/* Save the BAUD divider (the fractional part is not used for UARTs) */
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regval = UART_BRGR_CD(intpart) | UART_BRGR_FP(fracpart);
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putreg32(regval, SAM_CONSOLE_BASE + SAM_UART_BRGR_OFFSET);
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/* Enable receiver & transmitter */
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putreg32((UART_CR_RXEN | UART_CR_TXEN),
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SAM_CONSOLE_BASE + SAM_UART_CR_OFFSET);
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#endif
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}
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