708 lines
20 KiB
C
708 lines
20 KiB
C
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/************************************************************************************
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* arch/arm/src/lpc54xx/lpc54_lowputc.c
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*
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* Copyright (C) 2017 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Parts of this file were adapted from sample code provided for the LPC54xx
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* family from NXP which has a compatible BSD license.
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*
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* Copyright (c) 2016, Freescale Semiconductor, Inc.
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* Copyright (c) 2016 - 2017 , NXP
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* All rights reserved.
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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 <stdbool.h>
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#include "up_arch.h"
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#include "up_internal.h"
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#include "chip/lpc54_memorymap.h"
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#include "chip/lpc54_syscon.h"
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#include "chip/lpc54_flexcomm.h"
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#include "chip/lpc54_usart.h"
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#include "lpc54_config.h"
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#include "lpc54_clockconfig.h"
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#include "lpc54_lowputc.h"
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#include <arch/board/board.h>
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/************************************************************************************
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* Pre-processor Definitions
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************************************************************************************/
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#if defined(CONFIG_USART0_SERIAL_CONSOLE)
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# define CONSOLE_BASE LPC54_FLEXCOMM0_BASE
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# define CONSOLE_BAUD CONFIG_USART0_BAUD
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# define CONSOLE_FCLK BOARD_FLEXCOMM0_FCLK
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# define CONSOLE_PARITY CONFIG_USART0_PARITY
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# define CONSOLE_BITS CONFIG_USART0_BITS
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# ifdef CONFIG_USART0_2STOP
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# define CONSOLE_STOPBITS2 true
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# else
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# define CONSOLE_STOPBITS2 false
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# endif
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# ifdef CONFIG_USART0_IFLOWCONTROL
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# define CONSOLE_IFLOW true
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# else
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# define CONSOLE_IFLOW false
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# endif
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# ifdef CONFIG_USART0_OFLOWCONTROL
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# define CONSOLE_OFLOW true
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# else
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# define CONSOLE_OFLOW false
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# endif
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#elif defined(CONFIG_USART1_SERIAL_CONSOLE)
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# define CONSOLE_BASE LPC54_FLEXCOMM1_BASE
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# define CONSOLE_BAUD CONFIG_USART1_BAUD
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# define CONSOLE_FCLK BOARD_FLEXCOMM1_FCLK
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# define CONSOLE_PARITY CONFIG_USART1_PARITY
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# define CONSOLE_BITS CONFIG_USART1_BITS
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# ifdef CONFIG_USART1_2STOP
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# define CONSOLE_STOPBITS2 true
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# else
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# define CONSOLE_STOPBITS2 false
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# endif
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# ifdef CONFIG_USART1_IFLOWCONTROL
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# define CONSOLE_IFLOW true
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# else
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# define CONSOLE_IFLOW false
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# endif
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# ifdef CONFIG_USART1_OFLOWCONTROL
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# define CONSOLE_OFLOW true
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# else
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# define CONSOLE_OFLOW false
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# endif
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#elif defined(CONFIG_USART2_SERIAL_CONSOLE)
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# define CONSOLE_BASE LPC54_FLEXCOMM2_BASE
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# define CONSOLE_BAUD CONFIG_USART2_BAUD
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# define CONSOLE_FCLK BOARD_FLEXCOMM2_FCLK
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# define CONSOLE_PARITY CONFIG_USART2_PARITY
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# define CONSOLE_BITS CONFIG_USART2_BITS
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# ifdef CONFIG_USART2_2STOP
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# define CONSOLE_STOPBITS2 true
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# else
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# define CONSOLE_STOPBITS2 false
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# endif
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# ifdef CONFIG_USART2_IFLOWCONTROL
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# define CONSOLE_IFLOW true
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# else
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# define CONSOLE_IFLOW false
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# endif
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# ifdef CONFIG_USART2_OFLOWCONTROL
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# define CONSOLE_OFLOW true
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# else
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# define CONSOLE_OFLOW false
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# endif
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#elif defined(CONFIG_USART3_SERIAL_CONSOLE)
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# define CONSOLE_BASE LPC54_FLEXCOMM3_BASE
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# define CONSOLE_BAUD CONFIG_USART3_BAUD
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# define CONSOLE_FCLK BOARD_FLEXCOMM3_FCLK
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# define CONSOLE_PARITY CONFIG_USART3_PARITY
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# define CONSOLE_BITS CONFIG_USART3_BITS
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# ifdef CONFIG_USART3_2STOP
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# define CONSOLE_STOPBITS2 true
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# else
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# define CONSOLE_STOPBITS2 false
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# endif
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# ifdef CONFIG_USART3_IFLOWCONTROL
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# define CONSOLE_IFLOW true
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# else
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# define CONSOLE_IFLOW false
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# endif
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# ifdef CONFIG_USART3_OFLOWCONTROL
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# define CONSOLE_OFLOW true
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# else
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# define CONSOLE_OFLOW false
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# endif
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#elif defined(CONFIG_USART4_SERIAL_CONSOLE)
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# define CONSOLE_BASE LPC54_FLEXCOMM4_BASE
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# define CONSOLE_BAUD CONFIG_USART4_BAUD
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# define CONSOLE_FCLK BOARD_FLEXCOMM4_FCLK
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# define CONSOLE_PARITY CONFIG_USART4_PARITY
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# define CONSOLE_BITS CONFIG_USART4_BITS
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# ifdef CONFIG_USART4_2STOP
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# define CONSOLE_STOPBITS2 true
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# else
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# define CONSOLE_STOPBITS2 false
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# endif
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# ifdef CONFIG_USART4_IFLOWCONTROL
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# define CONSOLE_IFLOW true
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# else
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# define CONSOLE_IFLOW false
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# endif
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# ifdef CONFIG_USART4_OFLOWCONTROL
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# define CONSOLE_OFLOW true
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# else
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# define CONSOLE_OFLOW false
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# endif
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#elif defined(CONFIG_USART5_SERIAL_CONSOLE)
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# define CONSOLE_BASE LPC54_FLEXCOMM5_BASE
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# define CONSOLE_BAUD CONFIG_USART5_BAUD
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# define CONSOLE_FCLK BOARD_FLEXCOMM5_FCLK
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# define CONSOLE_PARITY CONFIG_USART5_PARITY
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# define CONSOLE_BITS CONFIG_USART5_BITS
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# ifdef CONFIG_USART5_2STOP
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# define CONSOLE_STOPBITS2 true
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# else
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# define CONSOLE_STOPBITS2 false
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# endif
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# ifdef CONFIG_USART5_IFLOWCONTROL
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# define CONSOLE_IFLOW true
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# else
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# define CONSOLE_IFLOW false
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# endif
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# ifdef CONFIG_USART5_OFLOWCONTROL
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# define CONSOLE_OFLOW true
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# else
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# define CONSOLE_OFLOW false
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# endif
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#elif defined(CONFIG_USART6_SERIAL_CONSOLE)
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# define CONSOLE_BASE LPC54_FLEXCOMM6_BASE
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# define CONSOLE_BAUD CONFIG_USART6_BAUD
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# define CONSOLE_FCLK BOARD_FLEXCOMM6_FCLK
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# define CONSOLE_PARITY CONFIG_USART6_PARITY
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# define CONSOLE_BITS CONFIG_USART6_BITS
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# ifdef CONFIG_USART6_2STOP
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# define CONSOLE_STOPBITS2 true
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# else
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# define CONSOLE_STOPBITS2 false
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# endif
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# ifdef CONFIG_USART6_IFLOWCONTROL
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# define CONSOLE_IFLOW true
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# else
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# define CONSOLE_IFLOW false
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# endif
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# ifdef CONFIG_USART6_OFLOWCONTROL
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# define CONSOLE_OFLOW true
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# else
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# define CONSOLE_OFLOW false
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# endif
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#elif defined(CONFIG_USART7_SERIAL_CONSOLE)
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# define CONSOLE_BASE LPC54_FLEXCOMM7_BASE
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# define CONSOLE_BAUD CONFIG_USART7_BAUD
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# define CONSOLE_FCLK BOARD_FLEXCOMM7_FCLK
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# define CONSOLE_PARITY CONFIG_USART7_PARITY
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# define CONSOLE_BITS CONFIG_USART7_BITS
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# ifdef CONFIG_USART7_2STOP
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# define CONSOLE_STOPBITS2 true
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# else
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# define CONSOLE_STOPBITS2 false
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# endif
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# ifdef CONFIG_USART7_IFLOWCONTROL
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# define CONSOLE_IFLOW true
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# else
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# define CONSOLE_IFLOW false
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# endif
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# ifdef CONFIG_USART7_OFLOWCONTROL
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# define CONSOLE_OFLOW true
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# else
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# define CONSOLE_OFLOW false
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# endif
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#elif defined(CONFIG_USART8_SERIAL_CONSOLE)
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# define CONSOLE_BASE LPC54_FLEXCOMM8_BASE
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# define CONSOLE_BAUD CONFIG_USART8_BAUD
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# define CONSOLE_FCLK BOARD_FLEXCOMM8_FCLK
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# define CONSOLE_PARITY CONFIG_USART8_PARITY
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# define CONSOLE_BITS CONFIG_USART8_BITS
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# ifdef CONFIG_USART8_2STOP
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# define CONSOLE_STOPBITS2 true
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# else
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# define CONSOLE_STOPBITS2 false
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# endif
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# ifdef CONFIG_USART8_IFLOWCONTROL
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# define CONSOLE_IFLOW true
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# else
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# define CONSOLE_IFLOW false
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# endif
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# ifdef CONFIG_USART8_OFLOWCONTROL
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# define CONSOLE_OFLOW true
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# else
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# define CONSOLE_OFLOW false
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# endif
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#elif defined(CONFIG_USART9_SERIAL_CONSOLE)
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# define CONSOLE_BASE LPC54_FLEXCOMM9_BASE
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# define CONSOLE_BAUD CONFIG_USART9_BAUD
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# define CONSOLE_FCLK BOARD_FLEXCOMM9_FCLK
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# define CONSOLE_PARITY CONFIG_USART9_PARITY
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# define CONSOLE_BITS CONFIG_USART9_BITS
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# ifdef CONFIG_USART9_2STOP
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# define CONSOLE_STOPBITS2 true
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# else
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# define CONSOLE_STOPBITS2 false
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# endif
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# ifdef CONFIG_USART9_IFLOWCONTROL
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# define CONSOLE_IFLOW true
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# else
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# define CONSOLE_IFLOW false
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# endif
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# ifdef CONFIG_USART9_OFLOWCONTROL
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# define CONSOLE_OFLOW true
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# else
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# define CONSOLE_OFLOW false
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# endif
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#endif
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/************************************************************************************
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* Private Data
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************************************************************************************/
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#ifdef HAVE_USART_CONSOLE
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/* USART console configuration */
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static const struct uart_config_s g_console_config=
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{
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.baud = CONSOLE_BAUD,
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.fclk = CONSOLE_FCLK,
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.parity = CONSOLE_PARITY,
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.bits = CONSOLE_BITS,
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.txlevel = LPC54_USART_FIFO_DEPTH / 2,
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.rxlevel = LPC54_USART_FIFO_DEPTH - 1,
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.stopbits2 = CONSOLE_STOPBITS2,
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#ifdef CONFIG_SERIAL_IFLOWCONTROL
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.iflow = CONSOLE_IFLOW,
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#endif
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#ifdef CONFIG_SERIAL_OFLOWCONTROL
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.oflow = CONSOLE_OFLOW,
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#endif
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};
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#endif /* HAVE_USART_CONSOLE */
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/************************************************************************************
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* Private Functions
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************************************************************************************/
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/************************************************************************************
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* Name: lp54_setbaud
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*
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* Description:
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* Configure the USART BAUD.
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*
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************************************************************************************/
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#ifdef HAVE_USART_DEVICE
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static void lp54_setbaud(uintptr_t base, FAR const struct uart_config_s *config)
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{
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uint32_t bestdiff = (uint32_t)-1;
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uint32_t bestosr = 15;
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uint32_t bestbrg = (uint32_t)-1;
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uint32_t lastosr;
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uint32_t lastbrg;
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uint32_t osr;
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uint32_t brg;
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uint32_t diff;
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uint32_t baud;
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/* Smaller values of OSR can make the sampling position within a data bit less
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* accurate and may potentially cause more noise errors or incorrect data.
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*/
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for (osr = bestosr; osr >= 8; osr--)
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{
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brg = (config->fclk / ((osr + 1) * config->baud)) - 1;
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if (brg > 0xffff)
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{
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continue;
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}
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baud = config->fclk / ((osr + 1) * (brg + 1));
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if (config->baud < baud)
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{
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diff = baud - config->baud;
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}
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else
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{
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diff = config->baud - baud;
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}
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if (diff < bestdiff)
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{
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bestdiff = diff;
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bestosr = osr;
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bestbrg = brg;
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}
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lastosr = osr;
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lastbrg = brg;
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}
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/* Check for value over range */
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if (bestbrg > 0xffff)
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{
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bestosr = lastosr;
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bestbrg = lastbrg;
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}
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putreg32(bestosr, base + LPC54_USART_OSR_OFFSET);
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putreg32(bestbrg, base + LPC54_USART_BRG_OFFSET);
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}
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#endif
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/************************************************************************************
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* Public Functions
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************************************************************************************/
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/************************************************************************************
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* Name: lpc54_lowsetup
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*
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* Description:
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* Called at the very beginning of _start. Performs low level initialization
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* including setup of the console USART. This USART initialization is done
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* early so that the serial console is available for debugging very early in
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* the boot sequence.
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*
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************************************************************************************/
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void lpc54_lowsetup(void)
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{
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/* TODO: Configure Fractional Rate Generate in case it is selected as a Flexcomm
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* clock source.
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*/
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#ifdef HAVE_USART_DEVICE
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#ifdef HAVE_USART0
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/* Attach 12 MHz clock to FLEXCOMM0 */
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putreg32(SYSCON_AHBCLKCTRL1_FLEXCOMM0, LPC54_SYSCON_AHBCLKCTRLSET1);
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/* Set FLEXCOMM0 to the USART peripheral, locking that configuration in place. */
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putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
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LPC54_FLEXCOMM0_PSELID);
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/* Set up the FLEXCOMM0 function clock */
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putreg32(BOARD_FLEXCOMM0_CLKSEL, LPC54_SYSCON_FCLKSEL0);
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#endif
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#ifdef HAVE_USART1
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/* Attach 12 MHz clock to FLEXCOMM1 */
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putreg32(SYSCON_AHBCLKCTRL1_FLEXCOMM1, LPC54_SYSCON_AHBCLKCTRLSET1);
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/* Set FLEXCOMM1 to the USART peripheral, locking that configuration in place. */
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putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
|
||
|
LPC54_FLEXCOMM1_PSELID);
|
||
|
|
||
|
/* Set up the FLEXCOMM1 function clock */
|
||
|
|
||
|
putreg32(BOARD_FLEXCOMM1_CLKSEL, LPC54_SYSCON_FCLKSEL1);
|
||
|
|
||
|
#endif
|
||
|
#ifdef HAVE_USART2
|
||
|
/* Attach 12 MHz clock to FLEXCOMM2 */
|
||
|
|
||
|
putreg32(SYSCON_AHBCLKCTRL1_FLEXCOMM2, LPC54_SYSCON_AHBCLKCTRLSET1);
|
||
|
|
||
|
/* Set FLEXCOMM2 to the USART peripheral, locking that configuration in place. */
|
||
|
|
||
|
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
|
||
|
LPC54_FLEXCOMM2_PSELID);
|
||
|
|
||
|
/* Set up the FLEXCOMM0 function clock */
|
||
|
|
||
|
putreg32(BOARD_FLEXCOMM2_CLKSEL, LPC54_SYSCON_FCLKSEL2);
|
||
|
|
||
|
#endif
|
||
|
#ifdef HAVE_USART3
|
||
|
/* Attach 12 MHz clock to FLEXCOMM3 */
|
||
|
|
||
|
putreg32(SYSCON_AHBCLKCTRL1_FLEXCOMM3, LPC54_SYSCON_AHBCLKCTRLSET1);
|
||
|
|
||
|
/* Set FLEXCOMM3 to the USART peripheral, locking that configuration in place. */
|
||
|
|
||
|
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
|
||
|
LPC54_FLEXCOMM3_PSELID);
|
||
|
|
||
|
/* Set up the FLEXCOMM3 function clock */
|
||
|
|
||
|
putreg32(BOARD_FLEXCOMM3_CLKSEL, LPC54_SYSCON_FCLKSEL3);
|
||
|
|
||
|
#endif
|
||
|
#ifdef HAVE_USART4
|
||
|
/* Attach 12 MHz clock to FLEXCOMM4 */
|
||
|
|
||
|
putreg32(SYSCON_AHBCLKCTRL1_FLEXCOMM4, LPC54_SYSCON_AHBCLKCTRLSET1);
|
||
|
|
||
|
/* Set FLEXCOMM4 to the USART peripheral, locking that configuration in place. */
|
||
|
|
||
|
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
|
||
|
LPC54_FLEXCOMM4_PSELID);
|
||
|
|
||
|
/* Set up the FLEXCOMM4 function clock */
|
||
|
|
||
|
putreg32(BOARD_FLEXCOMM4_CLKSEL, LPC54_SYSCON_FCLKSEL4);
|
||
|
|
||
|
#endif
|
||
|
#ifdef HAVE_USART5
|
||
|
/* Attach 12 MHz clock to FLEXCOMM5 */
|
||
|
|
||
|
putreg32(SYSCON_AHBCLKCTRL1_FLEXCOMM5, LPC54_SYSCON_AHBCLKCTRLSET1);
|
||
|
|
||
|
/* Set FLEXCOMM5 to the USART peripheral, locking that configuration in place. */
|
||
|
|
||
|
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
|
||
|
LPC54_FLEXCOMM5_PSELID);
|
||
|
|
||
|
/* Set up the FLEXCOMM5 function clock */
|
||
|
|
||
|
putreg32(BOARD_FLEXCOMM5_CLKSEL, LPC54_SYSCON_FCLKSEL5);
|
||
|
|
||
|
#endif
|
||
|
#ifdef HAVE_USART6
|
||
|
/* Attach 12 MHz clock to FLEXCOMM6 */
|
||
|
|
||
|
putreg32(SYSCON_AHBCLKCTRL1_FLEXCOMM6, LPC54_SYSCON_AHBCLKCTRLSET1);
|
||
|
|
||
|
/* Set FLEXCOMM6 to the USART peripheral, locking that configuration in place. */
|
||
|
|
||
|
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
|
||
|
LPC54_FLEXCOMM6_PSELID);
|
||
|
|
||
|
/* Set up the FLEXCOMM6 function clock */
|
||
|
|
||
|
putreg32(BOARD_FLEXCOMM6_CLKSEL, LPC54_SYSCON_FCLKSEL6);
|
||
|
|
||
|
#endif
|
||
|
#ifdef HAVE_USART7
|
||
|
/* Attach 12 MHz clock to FLEXCOMM7 */
|
||
|
|
||
|
putreg32(SYSCON_AHBCLKCTRL1_FLEXCOMM7, LPC54_SYSCON_AHBCLKCTRLSET1);
|
||
|
|
||
|
/* Set FLEXCOMM7 to the USART peripheral, locking that configuration in place. */
|
||
|
|
||
|
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
|
||
|
LPC54_FLEXCOMM7_PSELID);
|
||
|
|
||
|
/* Set up the FLEXCOMM7 function clock */
|
||
|
|
||
|
putreg32(BOARD_FLEXCOMM7_CLKSEL, LPC54_SYSCON_FCLKSEL7);
|
||
|
|
||
|
#endif
|
||
|
#ifdef HAVE_USART8
|
||
|
/* Attach 12 MHz clock to FLEXCOMM8 */
|
||
|
|
||
|
putreg32(SYSCON_AHBCLKCTRL2_FLEXCOMM8, LPC54_SYSCON_AHBCLKCTRLSET2);
|
||
|
|
||
|
/* Set FLEXCOMM8 to the USART peripheral, locking that configuration in place. */
|
||
|
|
||
|
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
|
||
|
LPC54_FLEXCOMM8_PSELID);
|
||
|
|
||
|
/* Set up the FLEXCOMM0 function clock */
|
||
|
|
||
|
putreg32(BOARD_FLEXCOMM8_CLKSEL, LPC54_SYSCON_FCLKSEL8);
|
||
|
|
||
|
#endif
|
||
|
#ifdef HAVE_USART9
|
||
|
/* Attach 12 MHz clock to FLEXCOMM9 */
|
||
|
|
||
|
putreg32(SYSCON_AHBCLKCTRL2_FLEXCOMM9, LPC54_SYSCON_AHBCLKCTRLSET2);
|
||
|
|
||
|
/* Set FLEXCOMM9 to the USART peripheral, locking that configuration in place. */
|
||
|
|
||
|
putreg32(FLEXCOMM_PSELID_PERSEL_USART | FLEXCOMM_PSELID_LOCK,
|
||
|
LPC54_FLEXCOMM9_PSELID);
|
||
|
|
||
|
/* Set up the FLEXCOMM9 function clock */
|
||
|
|
||
|
putreg32(BOARD_FLEXCOMM9_CLKSEL, LPC54_SYSCON_FCLKSEL9);
|
||
|
|
||
|
#endif
|
||
|
|
||
|
#ifdef HAVE_USART_CONSOLE
|
||
|
/* Configure the console USART (if any) */
|
||
|
|
||
|
lpc54_usart_configure(CONSOLE_BASE, &g_console_config);
|
||
|
|
||
|
#endif /* HAVE_USART_CONSOLE */
|
||
|
#endif /* HAVE_USART_DEVICE */
|
||
|
}
|
||
|
|
||
|
/************************************************************************************
|
||
|
* Name: lpc54_usart_configure
|
||
|
*
|
||
|
* Description:
|
||
|
* Configure a UART for non-interrupt driven operation
|
||
|
*
|
||
|
************************************************************************************/
|
||
|
|
||
|
#ifdef HAVE_USART_DEVICE
|
||
|
void lpc54_usart_configure(uintptr_t base, FAR const struct uart_config_s *config)
|
||
|
{
|
||
|
uint32_t regval;
|
||
|
|
||
|
/* Configure baud */
|
||
|
|
||
|
lp54_setbaud(base, config);
|
||
|
|
||
|
/* Configure RX and TX FIFOs */
|
||
|
/* Empty and enable FIFOs */
|
||
|
|
||
|
regval = getreg32(base + LPC54_USART_FIFOCFG_OFFSET);
|
||
|
regval |= (USART_FIFOCFG_ENABLERX | USART_FIFOCFG_EMPTYRX);
|
||
|
regval |= (USART_FIFOCFG_ENABLETX | USART_FIFOCFG_EMPTYTX);
|
||
|
putreg32(regval, base + LPC54_USART_FIFOCFG_OFFSET);
|
||
|
|
||
|
/* Setup trigger level */
|
||
|
|
||
|
regval = getreg32(base + LPC54_USART_FIFOTRIG_OFFSET);
|
||
|
regval &= ~(USART_FIFOTRIG_TXLVL_MASK | USART_FIFOTRIG_RXLVL_MASK);
|
||
|
regval |= USART_FIFOTRIG_RXLVL(config->rxlevel);
|
||
|
regval |= USART_FIFOTRIG_TXLVL(config->txlevel);
|
||
|
putreg32(regval, base + LPC54_USART_FIFOTRIG_OFFSET);
|
||
|
|
||
|
/* Enable trigger events */
|
||
|
|
||
|
regval |= (USART_FIFOTRIG_RXLVLENA | USART_FIFOTRIG_TXLVLENA);
|
||
|
putreg32(regval, base + LPC54_USART_FIFOTRIG_OFFSET);
|
||
|
|
||
|
/* Setup configuration and enable USART */
|
||
|
|
||
|
regval = USART_CFG_ENABLE;
|
||
|
|
||
|
switch (config->bits)
|
||
|
{
|
||
|
case 7:
|
||
|
regval |= USART_CFG_DATALEN_7BIT;
|
||
|
break;
|
||
|
|
||
|
default:
|
||
|
case 8:
|
||
|
regval |= USART_CFG_DATALEN_8BIT;
|
||
|
break;
|
||
|
|
||
|
case 9:
|
||
|
regval |= USART_CFG_DATALEN_9BIT;
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
switch (config->parity)
|
||
|
{
|
||
|
default:
|
||
|
case 0:
|
||
|
regval |= USART_CFG_PARITYSEL_NONE;
|
||
|
break;
|
||
|
|
||
|
case 1:
|
||
|
regval |= USART_CFG_PARITYSEL_ODD;
|
||
|
break;
|
||
|
|
||
|
case 2:
|
||
|
regval |= USART_CFG_PARITYSEL_EVEN;
|
||
|
break;
|
||
|
}
|
||
|
|
||
|
if (config->stopbits2)
|
||
|
{
|
||
|
regval |= USART_CFG_STOPLEN;
|
||
|
}
|
||
|
|
||
|
putreg32(regval, base + LPC54_USART_CFG_OFFSET);
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
/****************************************************************************
|
||
|
* Name: lpc54_usart_disable
|
||
|
*
|
||
|
* Description:
|
||
|
* Disable a USART. it will be necessary to again call
|
||
|
* lpc54_usart_configure() in order to use this USART channel again.
|
||
|
*
|
||
|
****************************************************************************/
|
||
|
|
||
|
#ifdef HAVE_USART_DEVICE
|
||
|
void lpc54_usart_disable(uintptr_t base)
|
||
|
{
|
||
|
/* Disable interrupts */
|
||
|
|
||
|
putreg32(USART_FIFOINT_ALL, base + LPC54_USART_FIFOINTENCLR_OFFSET);
|
||
|
|
||
|
/* Disable the UART */
|
||
|
|
||
|
putreg32(0, base + LPC54_USART_CFG_OFFSET);
|
||
|
|
||
|
/* Disable the FIFOs */
|
||
|
|
||
|
putreg32(0, base + LPC54_USART_FIFOCFG_OFFSET);
|
||
|
putreg32(0, base + LPC54_USART_FIFOTRIG_OFFSET);
|
||
|
}
|
||
|
#endif
|
||
|
|
||
|
/****************************************************************************
|
||
|
* Name: up_lowputc
|
||
|
*
|
||
|
* Description:
|
||
|
* Output one byte on the serial console
|
||
|
*
|
||
|
****************************************************************************/
|
||
|
|
||
|
void up_lowputc(char ch)
|
||
|
{
|
||
|
#ifdef HAVE_USART_CONSOLE
|
||
|
irqstate_t flags;
|
||
|
|
||
|
for (; ; )
|
||
|
{
|
||
|
/* Wait for the transmit FIFO to be not full */
|
||
|
|
||
|
while ((getreg32(CONSOLE_BASE + LPC54_USART_FIFOSTAT_OFFSET) &
|
||
|
USART_FIFOSTAT_TXNOTFULL) == 0)
|
||
|
{
|
||
|
}
|
||
|
|
||
|
/* Disable interrupts so that the fest test and the transmission are
|
||
|
* atomic.
|
||
|
*/
|
||
|
|
||
|
flags = enter_critical_section();
|
||
|
if ((getreg32(CONSOLE_BASE + LPC54_USART_FIFOSTAT_OFFSET) &
|
||
|
USART_FIFOSTAT_TXNOTFULL) != 0)
|
||
|
{
|
||
|
/* Send the character */
|
||
|
|
||
|
putreg32((uint32_t)ch, CONSOLE_BASE + LPC54_USART_FIFOWR_OFFSET);
|
||
|
leave_critical_section(flags);
|
||
|
return;
|
||
|
}
|
||
|
|
||
|
leave_critical_section(flags);
|
||
|
}
|
||
|
#endif
|
||
|
}
|