c1a208af8b
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3703 42af7a65-404d-4744-a932-0658087f49c3
453 lines
13 KiB
C
453 lines
13 KiB
C
/******************************************************************************
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* arch/avr/src/atmega/atmega_lowconsole.c
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*
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* Copyright (C) 2011 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 "atmega_config.h"
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#include <assert.h>
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#include <debug.h>
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#include <arch/irq.h>
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#include <arch/board/board.h>
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#include <avr/io.h>
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#include "up_arch.h"
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#include "up_internal.h"
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#include "atmega_internal.h"
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/******************************************************************************
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* Private Definitions
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******************************************************************************/
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/* USART0 Baud rate settings for normal and double speed modes */
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#define AVR_NORMAL_UBRR0 \
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((((BOARD_CPU_CLOCK / 16) + (CONFIG_USART0_BAUD / 2)) / (CONFIG_USART0_BAUD)) - 1)
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#define AVR_DBLSPEED_UBRR0 \
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((((BOARD_CPU_CLOCK / 8) + (CONFIG_USART0_BAUD / 2)) / (CONFIG_USART0_BAUD)) - 1)
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/* Select normal or double speed baud settings. This is a trade-off between the
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* sampling rate and the accuracy of the divisor for high baud rates.
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*
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* As examples, consider:
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*
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* BOARD_CPU_CLOCK=8MHz and BAUD=115200:
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* AVR_NORMAL_UBRR1 = 4 (rounded), actual baud = 125,000
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* AVR_DBLSPEED_UBRR1 = 9 (rounded), actual baud = 111,111
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*
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* BOARD_CPU_CLOCK=8MHz and BAUD=9600:
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* AVR_NORMAL_UBRR1 = 52 (rounded), actual baud = 9615
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* AVR_DBLSPEED_UBRR1 = 104 (rounded), actual baud = 9615
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*/
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#undef UART0_DOUBLE_SPEED
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#if BOARD_CPU_CLOCK <= 4000000
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# if CONFIG_USART0_BAUD <= 9600
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# define AVR_UBRR0 AVR_NORMAL_UBRR0
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# else
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# define AVR_UBRR0 AVR_DBLSPEED_UBRR0
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# define UART0_DOUBLE_SPEED 1
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# endif
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#elif BOARD_CPU_CLOCK <= 8000000
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# if CONFIG_USART0_BAUD <= 19200
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# define AVR_UBRR0 AVR_NORMAL_UBRR0
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# else
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# define AVR_UBRR0 AVR_DBLSPEED_UBRR0
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# define UART0_DOUBLE_SPEED 1
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# endif
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#elif BOARD_CPU_CLOCK <= 12000000
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# if CONFIG_USART0_BAUD <= 28800
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# define AVR_UBRR0 AVR_NORMAL_UBRR0
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# else
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# define AVR_UBRR0 AVR_DBLSPEED_UBRR0
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# define UART0_DOUBLE_SPEED 1
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# endif
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#elif BOARD_CPU_CLOCK <= 16000000
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# if CONFIG_USART0_BAUD <= 38400
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# define AVR_UBRR0 AVR_NORMAL_UBRR0
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# else
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# define AVR_UBRR0 AVR_DBLSPEED_UBRR0
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# define UART0_DOUBLE_SPEED 1
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# endif
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#else
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# if CONFIG_USART0_BAUD <= 57600
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# define AVR_UBRR0 AVR_NORMAL_UBRR0
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# else
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# define AVR_UBRR0 AVR_DBLSPEED_UBRR0
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# define UART0_DOUBLE_SPEED 1
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# endif
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#endif
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/* USART1 Baud rate settings for normal and double speed modes */
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#define AVR_NORMAL_UBRR1 \
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((((BOARD_CPU_CLOCK / 16) + (CONFIG_USART1_BAUD / 2)) / (CONFIG_USART1_BAUD)) - 1)
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#define AVR_DBLSPEED_UBRR1 \
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((((BOARD_CPU_CLOCK / 8) + (CONFIG_USART1_BAUD / 2)) / (CONFIG_USART1_BAUD)) - 1)
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/* Select normal or double speed baud settings. This is a trade-off between the
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* sampling rate and the accuracy of the divisor for high baud rates.
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*
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* As examples, consider:
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*
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* BOARD_CPU_CLOCK=8MHz and BAUD=115200:
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* AVR_NORMAL_UBRR1 = 4 (rounded), actual baud = 125,000
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* AVR_DBLSPEED_UBRR1 = 9 (rounded), actual baud = 111,111
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*
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* BOARD_CPU_CLOCK=8MHz and BAUD=9600:
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* AVR_NORMAL_UBRR1 = 52 (rounded), actual baud = 9615
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* AVR_DBLSPEED_UBRR1 = 104 (rounded), actual baud = 9615
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*/
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#undef UART1_DOUBLE_SPEED
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#if BOARD_CPU_CLOCK <= 4000000
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# if CONFIG_USART1_BAUD <= 9600
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# define AVR_UBRR1 AVR_NORMAL_UBRR1
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# else
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# define AVR_UBRR1 AVR_DBLSPEED_UBRR1
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# define UART1_DOUBLE_SPEED 1
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# endif
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#elif BOARD_CPU_CLOCK <= 8000000
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# if CONFIG_USART1_BAUD <= 19200
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# define AVR_UBRR1 AVR_NORMAL_UBRR1
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# else
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# define AVR_UBRR1 AVR_DBLSPEED_UBRR1
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# define UART1_DOUBLE_SPEED 1
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# endif
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#elif BOARD_CPU_CLOCK <= 12000000
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# if CONFIG_USART1_BAUD <= 28800
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# define AVR_UBRR1 AVR_NORMAL_UBRR1
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# else
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# define AVR_UBRR1 AVR_DBLSPEED_UBRR1
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# define UART1_DOUBLE_SPEED 1
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# endif
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#elif BOARD_CPU_CLOCK <= 16000000
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# if CONFIG_USART1_BAUD <= 38400
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# define AVR_UBRR1 AVR_NORMAL_UBRR1
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# else
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# define AVR_UBRR1 AVR_DBLSPEED_UBRR1
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# define UART1_DOUBLE_SPEED 1
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# endif
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#else
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# if CONFIG_USART1_BAUD <= 57600
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# define AVR_UBRR1 AVR_NORMAL_UBRR1
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# else
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# define AVR_UBRR1 AVR_DBLSPEED_UBRR1
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# define UART1_DOUBLE_SPEED 1
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# endif
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#endif
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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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* Global Variables
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******************************************************************************/
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/******************************************************************************
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* Private Variables
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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: usart0_reset and usart1_reset
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*
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* Description:
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* Reset USART0 or USART1.
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*
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****************************************************************************/
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#ifdef CONFIG_AVR_USART0
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void usart0_reset(void)
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{
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/* Clear USART configuration */
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UCSR0A = 0;
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UCSR0B = 0;
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UCSR0C = 0;
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/* Unconfigure pins (no action needed */
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DDRE &= ~(1 << 1);
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PORTE &= ~(1 << 0);
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/* Unconfigure BAUD divisor */
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UBRR0H = 0;
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UBRR0L = 0;
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}
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#endif
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#ifdef CONFIG_AVR_USART1
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void usart1_reset(void)
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{
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/* Clear USART configuration */
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UCSR1A = 0;
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UCSR1B = 0;
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UCSR1C = 0;
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/* Unconfigure pins */
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DDRD &= ~(1 << 3);
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PORTD &= ~(1 << 2);
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/* Unconfigure BAUD divisor */
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UBRR1H = 0;
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UBRR1L = 0;
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}
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#endif
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/****************************************************************************
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* Name: usart0_configure and usart1_configure
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*
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* Description:
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* Configure USART0 or USART1.
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*
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****************************************************************************/
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#ifdef CONFIG_AVR_USART0
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void usart0_configure(void)
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{
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uint8_t ucsr0b;
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uint8_t ucsr0c;
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/* Select normal or double speed. */
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#ifdef UART0_DOUBLE_SPEED
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UCSR0A = (1 << U2X0);
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#else
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UCSR0A = 0;
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#endif
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/* Select baud, parity, nubmer of bits, stop bits, etc. */
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ucsr0b = ((1 << TXEN0) | (1 << RXEN0));
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ucsr0c = 0;
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/* Select parity */
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#if CONFIG_USART0_PARITY == 1
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ucsr0c |= ((1 << UPM01) | (1 << UPM00)); /* Odd parity */
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#elif CONFIG_USART0_PARITY == 2
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ucsr0c |= (1 << UPM00); /* Even parity */
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#endif
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/* 1 or 2 stop bits */
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#if defined(CONFIG_USART0_2STOP) && CONFIG_USART0_2STOP > 0
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ucsr0c |= (1 << USBS0); /* Two stop bits */
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#endif
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/* Word size */
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#if CONFIG_USART0_BITS == 5
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#elif CONFIG_USART0_BITS == 6
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ucsr0c |= (1 << UCSZ00);
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#elif CONFIG_USART0_BITS == 7
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ucsr0c |= (1 << UCSZ01);
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#elif CONFIG_USART0_BITS == 8
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ucsr0c |= ((1 << UCSZ00) | (1 << UCSZ01));
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#elif CONFIG_USART0_BITS == 9
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ucsr0c |= ((1 << UCSZ0) | (1 << UCSZ01));
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ucsr0b |= (1 << UCSZ02);
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#else
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# error "Unsupported word size"
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#endif
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UCSR0B = ucsr0b;
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UCSR0C = ucsr0c;
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/* Pin Configuration: None necessary, Port E bits 0&1 are automatically
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* configured:
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*
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* Port E, Bit 0: RXD0, USART0 Receive Pin. Receive Data (Data input pin
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* for the USART0). When the USART0 receiver is enabled this pin is
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* configured as an input regardless of the value of DDRE0. When the
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* USART0 forces this pin to be an input, a logical one in PORTE0 will
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* turn on the internal pull-up.
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*
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* Port E, Bit 1: TXD0, UART0 Transmit pin.
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*
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* REVISIT: According to table 41, TXD0 is also automatically configured.
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* However, this is not explicitly stated in the text.
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*/
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DDRE |= (1 << 1); /* Force Port E pin 1 to be an input -- might not be necessary */
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PORTE |= (1 << 0); /* Set pull-up on Port E pin 0 */
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/* Set the baud rate divisor */
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UBRR0H = AVR_UBRR0 >> 8;
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UBRR0L = AVR_UBRR0 & 0xff;
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}
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#endif
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#ifdef CONFIG_AVR_USART1
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void usart1_configure(void)
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{
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uint8_t ucsr1b;
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uint8_t ucsr1c;
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/* Select normal or double speed. */
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#ifdef UART1_DOUBLE_SPEED
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UCSR1A = (1 << U2X1);
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#else
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UCSR1A = 0;
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#endif
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/* Select baud, parity, nubmer of bits, stop bits, etc. */
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ucsr1b = ((1 << TXEN1) | (1 << RXEN1));
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ucsr1c = 0;
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/* Select parity */
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#if CONFIG_USART1_PARITY == 1
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ucsr1c |= ((1 << UPM11) | (1 << UPM10)); /* Odd parity */
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#elif CONFIG_USART1_PARITY == 2
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ucsr1c |= (1 << UPM11); /* Even parity */
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#endif
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/* 1 or 2 stop bits */
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#if defined(CONFIG_USART1_2STOP) && CONFIG_USART1_2STOP > 0
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ucsr1c |= (1 << USBS1); /* Two stop bits */
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#endif
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/* Word size */
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#if CONFIG_USART1_BITS == 5
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#elif CONFIG_USART1_BITS == 6
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ucsr1c |= (1 << UCSZ10);
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#elif CONFIG_USART1_BITS == 7
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ucsr1c |= (1 << UCSZ11);
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#elif CONFIG_USART1_BITS == 8
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ucsr1c |= ((1 << UCSZ10) | (1 << UCSZ11));
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#elif CONFIG_USART1_BITS == 9
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ucsr1c |= (U(1 << CSZ10) | (1 << UCSZ11));
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ucsr1b |= (1 << UCSZ12);
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#else
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# error "Unsupported word size"
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#endif
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UCSR1B = ucsr1b;
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UCSR1C = ucsr1c;
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/* Pin Configuration: None necessary, Port D bits 2&3 are automatically
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* configured:
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*
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* Port D, Bit 2: RXD1, Receive Data (Data input pin for the USART1). When
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* the USART1 receiver is enabled this pin is configured as an input
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* regardless of the value of DDD2. When the USART forces this pin to
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* be an input, the pull-up can still be controlled by the PORTD2 bit.
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* Port D, Bit 3: TXD1, Transmit Data (Data output pin for the USART1).
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* When the USART1 Transmitter is enabled, this pin is configured as
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* an output regardless of the value of DDD3.
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*/
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DDRD |= (1 << 3); /* Force Port D pin 3 to be an output -- should not be necessary */
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PORTD |= (1 << 2); /* Set pull-up on port D pin 2 */
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/* Set the baud rate divisor */
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UBRR1H = AVR_UBRR1 >> 8;
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UBRR1L = AVR_UBRR1 & 0xff;
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}
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#endif
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/******************************************************************************
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* Name: up_consoleinit
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*
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* Description:
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* Initialize a console for debug output. This function is called very
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* early in the intialization sequence to configure the serial console uart
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* (only).
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*
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******************************************************************************/
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void up_consoleinit(void)
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{
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#ifdef HAVE_SERIAL_CONSOLE
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# if defined(CONFIG_USART0_SERIAL_CONSOLE)
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usart0_configure();
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# elif defined(CONFIG_USART1_SERIAL_CONSOLE)
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usart1_configure();
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# endif
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#endif
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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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# if defined(CONFIG_USART0_SERIAL_CONSOLE)
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while ((UCSR0A & (1 << UDRE0)) == 0);
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UDR0 = ch;
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# elif defined(CONFIG_USART1_SERIAL_CONSOLE)
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while ((UCSR1A & (1 << UDRE1)) == 0);
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UDR1 = ch;
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# endif
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#endif
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}
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