464 lines
13 KiB
C
464 lines
13 KiB
C
/****************************************************************************
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* arch/avr/src/atmega/atmega_lowconsole.c
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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_internal.h"
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#include "atmega.h"
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/****************************************************************************
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* Pre-processor 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
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* the 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 USART0_DOUBLE_SPEED
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#ifdef CONFIG_AVR_USART0
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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 USART0_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 USART0_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 USART0_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 USART0_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 USART0_DOUBLE_SPEED 1
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# endif
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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
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* the 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 USART1_DOUBLE_SPEED
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#ifdef CONFIG_AVR_USART1
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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 USART1_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 USART1_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 USART1_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 USART1_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 USART1_DOUBLE_SPEED 1
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# endif
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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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* 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: 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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#ifdef CONFIG_ARCH_CHIP_ATMEGA1284P
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DDRD &= ~(1 << 1);
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PORTD &= ~(1 << 0);
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#else
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DDRE &= ~(1 << 1);
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PORTE &= ~(1 << 0);
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#endif
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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 USART0_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, number 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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#ifdef CONFIG_ARCH_CHIP_ATMEGA1284P
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/* Pin Configuration: None necessary, Port D bits 0&1 are automatically
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* configured:
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*
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* Port D, 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 DDRD0. When the
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* USART0 forces this pin to be an input, a logical one in PORTD0 will
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* turn on the internal pull-up.
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*
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* Port D, Bit 1: TXD0, USART0 Transmit pin.
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*/
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DDRD |= (1 << 1); /* Force Port D pin 1 to be an output -- should not be necessary */
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PORTD |= (1 << 0); /* Set pull-up on Port D pin 0 */
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#else
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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, USART0 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 output -- might not be necessary */
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PORTE |= (1 << 0); /* Set pull-up on Port E pin 0 */
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#endif
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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 USART1_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, number 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 |= ((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).
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* When the USART1 receiver is enabled this pin is configured as an
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* input regardless of the value of DDD2. When the USART forces this
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* pin to be an input, the pull-up can still be controlled by the
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* 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 initialization sequence to configure the serial console
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* uart (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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