454 lines
15 KiB
C
454 lines
15 KiB
C
/**************************************************************************
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* arch/arm/src/sam34/sam_lowputc.c
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*
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* Copyright (C) 2010, 2013-2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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**************************************************************************/
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/**************************************************************************
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* Included Files
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**************************************************************************/
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#include <nuttx/config.h>
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#include <stdint.h>
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#include <arch/irq.h>
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#include <arch/board/board.h>
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#include "up_internal.h"
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#include "up_arch.h"
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#include "sam_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 "chip/sam_uart.h"
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#elif defined(CONFIG_ARCH_CHIP_SAM4L)
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# include "chip/sam4l_usart.h"
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#else
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# error Unknown UART
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#endif
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#include "chip/sam_pinmap.h"
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/**************************************************************************
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* Private 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_ISUART
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# undef CONFIG_SAM34_USART0
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#endif
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#ifndef CONFIG_USART1_ISUART
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# undef CONFIG_SAM34_USART1
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#endif
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#ifndef CONFIG_USART2_ISUART
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# undef CONFIG_SAM34_USART2
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#endif
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#ifndef CONFIG_USART3_ISUART
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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 the
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* main clock. (This could also be the MCK/8 or an external clock but
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* 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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* 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: 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_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 = irqsave();
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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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irqrestore(flags);
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return;
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}
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irqrestore(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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up_lowputc('\r');
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}
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up_lowputc(ch);
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#endif
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return ch;
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}
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/**************************************************************************
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* Name: sam_lowsetup
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*
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* Description:
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* This performs basic initialization of the USART used for the serial
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* console. Its purpose is to get the console output availabe as soon
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* as possible.
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*
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**************************************************************************/
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void sam_lowsetup(void)
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{
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/* 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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(void)sam_configgpio(GPIO_UART0_RXD);
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(void)sam_configgpio(GPIO_UART0_TXD);
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#endif
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#ifdef CONFIG_SAM34_UART1
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(void)sam_configgpio(GPIO_UART1_RXD);
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(void)sam_configgpio(GPIO_UART1_TXD);
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#endif
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#ifdef CONFIG_SAM34_USART0
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(void)sam_configgpio(GPIO_USART0_RXD);
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(void)sam_configgpio(GPIO_USART0_TXD);
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#ifdef CONFIG_USART0_OFLOWCONTROL
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(void)sam_configgpio(GPIO_USART0_CTS);
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#endif
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#ifdef CONFIG_USART0_IFLOWCONTROL
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(void)sam_configgpio(GPIO_USART0_RTS);
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#endif
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#endif
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#ifdef CONFIG_SAM34_USART1
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(void)sam_configgpio(GPIO_USART1_RXD);
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(void)sam_configgpio(GPIO_USART1_TXD);
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#ifdef CONFIG_USART1_OFLOWCONTROL
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(void)sam_configgpio(GPIO_USART1_CTS);
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#endif
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#ifdef CONFIG_USART1_IFLOWCONTROL
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(void)sam_configgpio(GPIO_USART1_RTS);
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#endif
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#endif
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#ifdef CONFIG_SAM34_USART2
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(void)sam_configgpio(GPIO_USART2_RXD);
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(void)sam_configgpio(GPIO_USART2_TXD);
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#ifdef CONFIG_USART2_OFLOWCONTROL
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(void)sam_configgpio(GPIO_USART2_CTS);
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#endif
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#ifdef CONFIG_USART2_IFLOWCONTROL
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(void)sam_configgpio(GPIO_USART2_RTS);
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#endif
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#endif
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#ifdef CONFIG_SAM34_USART3
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(void)sam_configgpio(GPIO_USART3_RXD);
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(void)sam_configgpio(GPIO_USART3_TXD);
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#ifdef CONFIG_USART3_OFLOWCONTROL
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(void)sam_configgpio(GPIO_USART3_CTS);
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#endif
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#ifdef CONFIG_USART3_IFLOWCONTROL
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(void)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)) / (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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