441 lines
14 KiB
C
441 lines
14 KiB
C
/****************************************************************************
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* arch/arm/src/sam34/sam_lowputc.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 <stdint.h>
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#include <nuttx/irq.h>
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#include "arm_internal.h"
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#include "arm_arch.h"
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#include "sam_gpio.h"
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#include "sam_periphclks.h"
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#include "sam_lowputc.h"
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#if defined(CONFIG_ARCH_CHIP_SAM3U) || defined(CONFIG_ARCH_CHIP_SAM3X) || \
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defined(CONFIG_ARCH_CHIP_SAM3A) || defined(CONFIG_ARCH_CHIP_SAM4CM) || \
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defined(CONFIG_ARCH_CHIP_SAM4S) || defined(CONFIG_ARCH_CHIP_SAM4E)
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# include "hardware/sam_uart.h"
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#elif defined(CONFIG_ARCH_CHIP_SAM4L)
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# include "hardware/sam4l_usart.h"
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#else
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# error Unknown UART
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#endif
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/* The board.h file may redefine pin configurations defined in sam_pinmap.h */
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#include "hardware/sam_pinmap.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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/* Configuration ************************************************************/
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/* If the USART is not being used as a UART, then it really isn't enabled
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* for our purposes.
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*/
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#ifndef CONFIG_USART0_SERIALDRIVER
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# undef CONFIG_SAM34_USART0
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#endif
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#ifndef CONFIG_USART1_SERIALDRIVER
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# undef CONFIG_SAM34_USART1
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#endif
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#ifndef CONFIG_USART2_SERIALDRIVER
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# undef CONFIG_SAM34_USART2
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#endif
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#ifndef CONFIG_USART3_SERIALDRIVER
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# undef CONFIG_SAM34_USART3
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#endif
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/* Is there a serial console? It could be on UART0-1 or USART0-3 */
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#if defined(CONFIG_UART0_SERIAL_CONSOLE) && defined(CONFIG_SAM34_UART0)
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# undef CONFIG_UART1_SERIAL_CONSOLE
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# undef CONFIG_USART0_SERIAL_CONSOLE
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# undef CONFIG_USART1_SERIAL_CONSOLE
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# undef CONFIG_USART2_SERIAL_CONSOLE
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# undef CONFIG_USART3_SERIAL_CONSOLE
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# define HAVE_CONSOLE 1
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#elif defined(CONFIG_UART1_SERIAL_CONSOLE) && defined(CONFIG_SAM34_UART1)
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# undef CONFIG_UART0_SERIAL_CONSOLE
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# undef CONFIG_USART0_SERIAL_CONSOLE
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# undef CONFIG_USART1_SERIAL_CONSOLE
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# undef CONFIG_USART2_SERIAL_CONSOLE
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# undef CONFIG_USART3_SERIAL_CONSOLE
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# define HAVE_CONSOLE 1
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#elif defined(CONFIG_USART0_SERIAL_CONSOLE) && defined(CONFIG_SAM34_USART0)
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# undef CONFIG_UART0_SERIAL_CONSOLE
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# undef CONFIG_UART1_SERIAL_CONSOLE
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# undef CONFIG_USART1_SERIAL_CONSOLE
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# undef CONFIG_USART2_SERIAL_CONSOLE
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# undef CONFIG_USART3_SERIAL_CONSOLE
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# define HAVE_CONSOLE 1
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#elif defined(CONFIG_USART1_SERIAL_CONSOLE) && defined(CONFIG_SAM34_USART1)
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# undef CONFIG_UART0_SERIAL_CONSOLE
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# undef CONFIG_UART1_SERIAL_CONSOLE
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# undef CONFIG_USART0_SERIAL_CONSOLE
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# undef CONFIG_USART2_SERIAL_CONSOLE
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# undef CONFIG_USART3_SERIAL_CONSOLE
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# define HAVE_CONSOLE 1
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#elif defined(CONFIG_USART2_SERIAL_CONSOLE) && defined(CONFIG_SAM34_USART2)
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# undef CONFIG_UART0_SERIAL_CONSOLE
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# undef CONFIG_UART1_SERIAL_CONSOLE
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# undef CONFIG_USART0_SERIAL_CONSOLE
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# undef CONFIG_USART1_SERIAL_CONSOLE
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# undef CONFIG_USART3_SERIAL_CONSOLE
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# define HAVE_CONSOLE 1
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#elif defined(CONFIG_USART3_SERIAL_CONSOLE) && defined(CONFIG_SAM34_USART3)
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# undef CONFIG_UART0_SERIAL_CONSOLE
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# undef CONFIG_UART1_SERIAL_CONSOLE
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# undef CONFIG_USART0_SERIAL_CONSOLE
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# undef CONFIG_USART1_SERIAL_CONSOLE
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# undef CONFIG_USART2_SERIAL_CONSOLE
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# define HAVE_CONSOLE 1
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#else
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# if !defined(CONFIG_NO_SERIAL_CONSOLE)
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# warning "No valid CONFIG_USARTn_SERIAL_CONSOLE Setting"
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# endif
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# undef CONFIG_UART0_SERIAL_CONSOLE
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# undef CONFIG_UART1_SERIAL_CONSOLE
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# undef CONFIG_USART0_SERIAL_CONSOLE
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# undef CONFIG_USART1_SERIAL_CONSOLE
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# undef CONFIG_USART2_SERIAL_CONSOLE
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# undef CONFIG_USART3_SERIAL_CONSOLE
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# undef HAVE_CONSOLE
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#endif
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#if defined(HAVE_CONSOLE)
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/* Select MCU-specific settings
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*
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* For the SAM3U, SAM3A, SAM3X, SAM4E and SAM4S the USARTs are driven by
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* the main clock. (This could also be the MCK/8 or an external clock
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* but those options have not yet been necessary).
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* For the SAM4L, the USARTs are driven by CLK_USART (undivided) which is
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* selected by the PBADIVMASK register.
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*/
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# if defined(CONFIG_ARCH_CHIP_SAM3U) || defined(CONFIG_ARCH_CHIP_SAM3X) || \
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defined(CONFIG_ARCH_CHIP_SAM3A) || defined(CONFIG_ARCH_CHIP_SAM4CM) || \
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defined(CONFIG_ARCH_CHIP_SAM4S) || defined(CONFIG_ARCH_CHIP_SAM4E)
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# define SAM_MR_USCLKS UART_MR_USCLKS_MCK /* Source = Main clock */
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# define SAM_USART_CLOCK BOARD_MCK_FREQUENCY /* Frequency of the main clock */
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# elif defined(CONFIG_ARCH_CHIP_SAM4L)
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# define SAM_MR_USCLKS UART_MR_USCLKS_USART /* Source = USART_CLK (undefined) */
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# define SAM_USART_CLOCK BOARD_PBA_FREQUENCY /* PBA frequency is undivided */
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# else
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# error Unrecognized SAM architecture
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# endif
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/* Select USART parameters for the selected console */
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# if defined(CONFIG_UART0_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_UART0_BASE
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# define SAM_CONSOLE_BAUD CONFIG_UART0_BAUD
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# define SAM_CONSOLE_BITS CONFIG_UART0_BITS
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# define SAM_CONSOLE_PARITY CONFIG_UART0_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_UART0_2STOP
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# elif defined(CONFIG_UART1_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_UART1_BASE
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# define SAM_CONSOLE_BAUD CONFIG_UART1_BAUD
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# define SAM_CONSOLE_BITS CONFIG_UART1_BITS
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# define SAM_CONSOLE_PARITY CONFIG_UART1_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_UART1_2STOP
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# elif defined(CONFIG_USART0_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_USART0_BASE
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# define SAM_CONSOLE_BAUD CONFIG_USART0_BAUD
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# define SAM_CONSOLE_BITS CONFIG_USART0_BITS
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# define SAM_CONSOLE_PARITY CONFIG_USART0_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_USART0_2STOP
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# elif defined(CONFIG_USART1_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_USART1_BASE
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# define SAM_CONSOLE_BAUD CONFIG_USART1_BAUD
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# define SAM_CONSOLE_BITS CONFIG_USART1_BITS
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# define SAM_CONSOLE_PARITY CONFIG_USART1_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_USART1_2STOP
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# elif defined(CONFIG_USART2_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_USART2_BASE
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# define SAM_CONSOLE_BAUD CONFIG_USART2_BAUD
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# define SAM_CONSOLE_BITS CONFIG_USART2_BITS
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# define SAM_CONSOLE_PARITY CONFIG_USART2_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_USART2_2STOP
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# elif defined(CONFIG_USART3_SERIAL_CONSOLE)
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# define SAM_CONSOLE_BASE SAM_USART3_BASE
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# define SAM_CONSOLE_BAUD CONFIG_USART3_BAUD
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# define SAM_CONSOLE_BITS CONFIG_USART3_BITS
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# define SAM_CONSOLE_PARITY CONFIG_USART3_PARITY
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# define SAM_CONSOLE_2STOP CONFIG_USART3_2STOP
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# else
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# error "No CONFIG_U[S]ARTn_SERIAL_CONSOLE Setting"
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# endif
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/* Select the settings for the mode register */
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# if SAM_CONSOLE_BITS == 5
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# define MR_CHRL_VALUE UART_MR_CHRL_5BITS /* 5 bits */
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# elif SAM_CONSOLE_BITS == 6
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# define MR_CHRL_VALUE UART_MR_CHRL_6BITS /* 6 bits */
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# elif SAM_CONSOLE_BITS == 7
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# define MR_CHRL_VALUE UART_MR_CHRL_7BITS /* 7 bits */
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# elif SAM_CONSOLE_BITS == 8
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# define MR_CHRL_VALUE UART_MR_CHRL_8BITS /* 8 bits */
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# elif SAM_CONSOLE_BITS == 9 && !defined(CONFIG_UART0_SERIAL_CONSOLE) && \
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!defined(CONFIG_UART1_SERIAL_CONSOLE)
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# define MR_CHRL_VALUE UART_MR_MODE9
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# else
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# error "Invalid number of bits"
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# endif
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# if SAM_CONSOLE_PARITY == 1
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# define MR_PAR_VALUE UART_MR_PAR_ODD
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# elif SAM_CONSOLE_PARITY == 2
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# define MR_PAR_VALUE UART_MR_PAR_EVEN
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# else
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# define MR_PAR_VALUE UART_MR_PAR_NONE
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# endif
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# if SAM_CONSOLE_2STOP != 0
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# define MR_NBSTOP_VALUE UART_MR_NBSTOP_2
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# else
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# define MR_NBSTOP_VALUE UART_MR_NBSTOP_1
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# endif
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# define MR_VALUE (UART_MR_MODE_NORMAL | SAM_MR_USCLKS | \
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MR_CHRL_VALUE | MR_PAR_VALUE | MR_NBSTOP_VALUE)
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#endif /* HAVE_CONSOLE */
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/****************************************************************************
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* Private Types
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****************************************************************************/
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/****************************************************************************
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* Private Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: arm_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 arm_lowputc(char ch)
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{
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#ifdef HAVE_CONSOLE
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irqstate_t flags;
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for (; ; )
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{
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/* Wait for the transmitter to be available */
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while ((getreg32(SAM_CONSOLE_BASE + SAM_UART_SR_OFFSET) &
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UART_INT_TXEMPTY) == 0);
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/* Disable interrupts so that the test and the transmission are
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* atomic.
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*/
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flags = enter_critical_section();
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if ((getreg32(SAM_CONSOLE_BASE + SAM_UART_SR_OFFSET) &
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UART_INT_TXEMPTY) != 0)
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{
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/* Send the character */
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putreg32((uint32_t)ch, SAM_CONSOLE_BASE + SAM_UART_THR_OFFSET);
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leave_critical_section(flags);
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return;
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}
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leave_critical_section(flags);
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}
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#endif
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}
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/****************************************************************************
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* Name: up_putc
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*
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* Description:
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* Provide priority, low-level access to support OS debug writes
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*
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****************************************************************************/
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int up_putc(int ch)
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{
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#ifdef HAVE_CONSOLE
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/* Check for LF */
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if (ch == '\n')
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{
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/* Add CR */
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arm_lowputc('\r');
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}
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arm_lowputc(ch);
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#endif
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return ch;
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}
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/****************************************************************************
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* Name: sam_lowsetup
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*
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* Description:
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* This performs basic initialization of the USART used for the serial
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* console. Its purpose is to get the console output available as soon
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* as possible.
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*
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****************************************************************************/
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void sam_lowsetup(void)
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{
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/* Enable clocking for all selected UART/USARTs */
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#ifdef CONFIG_SAM34_UART0
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sam_uart0_enableclk();
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#endif
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#ifdef CONFIG_SAM34_UART1
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sam_uart1_enableclk();
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#endif
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#ifdef CONFIG_SAM34_USART0
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sam_usart0_enableclk();
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#endif
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#ifdef CONFIG_SAM34_USART1
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sam_usart1_enableclk();
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#endif
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#ifdef CONFIG_SAM34_USART2
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sam_usart2_enableclk();
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#endif
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#ifdef CONFIG_SAM34_USART3
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sam_usart3_enableclk();
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#endif
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/* Configure UART pins for all selected UART/USARTs */
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#ifdef CONFIG_SAM34_UART0
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sam_configgpio(GPIO_UART0_RXD);
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sam_configgpio(GPIO_UART0_TXD);
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#endif
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#ifdef CONFIG_SAM34_UART1
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sam_configgpio(GPIO_UART1_RXD);
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sam_configgpio(GPIO_UART1_TXD);
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#endif
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#ifdef CONFIG_SAM34_USART0
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sam_configgpio(GPIO_USART0_RXD);
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sam_configgpio(GPIO_USART0_TXD);
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#ifdef CONFIG_USART0_OFLOWCONTROL
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sam_configgpio(GPIO_USART0_CTS);
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#endif
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#ifdef CONFIG_USART0_IFLOWCONTROL
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sam_configgpio(GPIO_USART0_RTS);
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#endif
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#endif
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#ifdef CONFIG_SAM34_USART1
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sam_configgpio(GPIO_USART1_RXD);
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sam_configgpio(GPIO_USART1_TXD);
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#ifdef CONFIG_USART1_OFLOWCONTROL
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sam_configgpio(GPIO_USART1_CTS);
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#endif
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#ifdef CONFIG_USART1_IFLOWCONTROL
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sam_configgpio(GPIO_USART1_RTS);
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#endif
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#endif
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#ifdef CONFIG_SAM34_USART2
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sam_configgpio(GPIO_USART2_RXD);
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sam_configgpio(GPIO_USART2_TXD);
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#ifdef CONFIG_USART2_OFLOWCONTROL
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sam_configgpio(GPIO_USART2_CTS);
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#endif
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#ifdef CONFIG_USART2_IFLOWCONTROL
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sam_configgpio(GPIO_USART2_RTS);
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#endif
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#endif
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#ifdef CONFIG_SAM34_USART3
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sam_configgpio(GPIO_USART3_RXD);
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sam_configgpio(GPIO_USART3_TXD);
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#ifdef CONFIG_USART3_OFLOWCONTROL
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sam_configgpio(GPIO_USART3_CTS);
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#endif
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#ifdef CONFIG_USART3_IFLOWCONTROL
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sam_configgpio(GPIO_USART3_RTS);
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#endif
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#endif
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/* Configure the console (only) */
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#if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
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/* Reset and disable receiver and transmitter */
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putreg32((UART_CR_RSTRX | UART_CR_RSTTX | UART_CR_RXDIS | UART_CR_TXDIS),
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SAM_CONSOLE_BASE + SAM_UART_CR_OFFSET);
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/* Disable all interrupts */
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putreg32(0xffffffff, SAM_CONSOLE_BASE + SAM_UART_IDR_OFFSET);
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/* Set up the mode register */
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putreg32(MR_VALUE, SAM_CONSOLE_BASE + SAM_UART_MR_OFFSET);
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/* Configure the console baud. NOTE: Oversampling by 8 is not supported.
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* This may limit BAUD rates for lower USART clocks.
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*/
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putreg32(((SAM_USART_CLOCK + (SAM_CONSOLE_BAUD << 3)) /
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(SAM_CONSOLE_BAUD << 4)),
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SAM_CONSOLE_BASE + SAM_UART_BRGR_OFFSET);
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/* Enable receiver & transmitter */
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putreg32((UART_CR_RXEN | UART_CR_TXEN),
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SAM_CONSOLE_BASE + SAM_UART_CR_OFFSET);
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#endif
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}
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