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/**************************************************************************
* arch/arm/src/sam3u/sam3u_lowputc.c
*
* Copyright (C) 2010 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
**************************************************************************/
/**************************************************************************
* Included Files
**************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <arch/irq.h>
#include <arch/board/board.h>
#include "up_internal.h"
#include "up_arch.h"
#include "sam3u_internal.h"
#include "sam3u_pmc.h"
#include "sam3u_uart.h"
/**************************************************************************
* Private Definitions
**************************************************************************/
/* Configuration **********************************************************/
/* If the USART is not being used as a UART, then it really isn't enabled
* for our purposes.
*/
#ifndef CONFIG_USART0_ISUART
# undef CONFIG_SAM3U_USART0
#endif
#ifndef CONFIG_USART1_ISUART
# undef CONFIG_SAM3U_USART1
#endif
#ifndef CONFIG_USART2_ISUART
# undef CONFIG_SAM3U_USART2
#endif
#ifndef CONFIG_USART3_ISUART
# undef CONFIG_SAM3U_USART3
#endif
/* Is there a serial console? It could be on the UART, or USARTn */
#if defined(CONFIG_UART_SERIAL_CONSOLE) && defined(CONFIG_SAM3U_UART)
# undef CONFIG_USART0_SERIAL_CONSOLE
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART0_SERIAL_CONSOLE) && defined(CONFIG_SAM3U_USART0)
# undef CONFIG_USART_SERIAL_CONSOLE
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART1_SERIAL_CONSOLE) && defined(CONFIG_SAM3U_USART1)
# undef CONFIG_USART_SERIAL_CONSOLE
# undef CONFIG_USART0_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART2_SERIAL_CONSOLE) && defined(CONFIG_SAM3U_USART2)
# undef CONFIG_USART_SERIAL_CONSOLE
# undef CONFIG_USART0_SERIAL_CONSOLE
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#elif defined(CONFIG_USART3_SERIAL_CONSOLE) && defined(CONFIG_SAM3U_USART3)
# undef CONFIG_USART_SERIAL_CONSOLE
# undef CONFIG_USART0_SERIAL_CONSOLE
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# define HAVE_CONSOLE 1
#else
# undef CONFIG_USART_SERIAL_CONSOLE
# undef CONFIG_USART0_SERIAL_CONSOLE
# undef CONFIG_USART1_SERIAL_CONSOLE
# undef CONFIG_USART2_SERIAL_CONSOLE
# undef CONFIG_USART3_SERIAL_CONSOLE
# undef HAVE_CONSOLE
#endif
/* Select USART parameters for the selected console */
#if defined(CONFIG_UART_SERIAL_CONSOLE)
# define SAM3U_CONSOLE_BASE SAM3U_UART_BASE
# define SAM3U_CONSOLE_BAUD CONFIG_UART_BAUD
# define SAM3U_CONSOLE_BITS CONFIG_UART_BITS
# define SAM3U_CONSOLE_PARITY CONFIG_UART_PARITY
# define SAM3U_CONSOLE_2STOP CONFIG_UART_2STOP
#elif defined(CONFIG_USART0_SERIAL_CONSOLE)
# define SAM3U_CONSOLE_BASE SAM3U_USART0_BASE
# define SAM3U_CONSOLE_BAUD CONFIG_USART0_BAUD
# define SAM3U_CONSOLE_BITS CONFIG_USART0_BITS
# define SAM3U_CONSOLE_PARITY CONFIG_USART0_PARITY
# define SAM3U_CONSOLE_2STOP CONFIG_USART0_2STOP
#elif defined(CONFIG_USART1_SERIAL_CONSOLE)
# define SAM3U_CONSOLE_BASE SAM3U_USART1_BASE
# define SAM3U_CONSOLE_BAUD CONFIG_USART1_BAUD
# define SAM3U_CONSOLE_BITS CONFIG_USART1_BITS
# define SAM3U_CONSOLE_PARITY CONFIG_USART1_PARITY
# define SAM3U_CONSOLE_2STOP CONFIG_USART1_2STOP
#elif defined(CONFIG_USART2_SERIAL_CONSOLE)
# define SAM3U_CONSOLE_BASE SAM3U_USART2_BASE
# define SAM3U_CONSOLE_BAUD CONFIG_USART2_BAUD
# define SAM3U_CONSOLE_BITS CONFIG_USART2_BITS
# define SAM3U_CONSOLE_PARITY CONFIG_USART2_PARITY
# define SAM3U_CONSOLE_2STOP CONFIG_USART2_2STOP
#elif defined(CONFIG_USART3_SERIAL_CONSOLE)
# define SAM3U_CONSOLE_BASE SAM3U_USART3_BASE
# define SAM3U_CONSOLE_BAUD CONFIG_USART3_BAUD
# define SAM3U_CONSOLE_BITS CONFIG_USART3_BITS
# define SAM3U_CONSOLE_PARITY CONFIG_USART3_PARITY
# define SAM3U_CONSOLE_2STOP CONFIG_USART3_2STOP
#else
# error "No CONFIG_U[S]ARTn_SERIAL_CONSOLE Setting"
#endif
/* Select the settings for the mode register */
#if SAM3U_CONSOLE_BITS == 5
# define MR_CHRL_VALUE USART_MR_CHRL_5BITS /* 5 bits */
#elif SAM3U_CONSOLE_BITS == 6
# define MR_CHRL_VALUE USART_MR_CHRL_6BITS /* 6 bits */
#elif SAM3U_CONSOLE_BITS == 7
# define MR_CHRL_VALUE USART_MR_CHRL_7BITS /* 7 bits */
#elif SAM3U_CONSOLE_BITS == 8
# define MR_CHRL_VALUE USART_MR_CHRL_8BITS /* 8 bits */
#elif SAM3U_CONSOLE_BITS == 9 && !defined(CONFIG_UART_SERIAL_CONSOLE)
# define MR_CHRL_VALUE USART_MR_MODE9
#else
# error "Invlaid number of bits"
#endif
#if SAM3U_CONSOLE_PARITY == 1
# define MR_PAR_VALUE UART_MR_PAR_ODD
#elif SAM3U_CONSOLE_PARITY == 2
# define MR_PAR_VALUE UART_MR_PAR_EVEN
#else
# define MR_PAR_VALUE UART_MR_PAR_NONE
#endif
#if SAM3U_CONSOLE_2STOP != 0
# define MR_NBSTOP_VALUE USART_MR_NBSTOP_2
#else
# define MR_NBSTOP_VALUE USART_MR_NBSTOP_1
#endif
#define MR_VALUE (USART_MR_MODE_NORMAL|USART_MR_USCLKS_MCK|MR_CHRL_VALUE|MR_PAR_VALUE|MR_NBSTOP_VALUE)
/**************************************************************************
* Private Types
**************************************************************************/
/**************************************************************************
* Private Function Prototypes
**************************************************************************/
/**************************************************************************
* Global Variables
**************************************************************************/
/**************************************************************************
* Private Variables
**************************************************************************/
/**************************************************************************
* Private Functions
**************************************************************************/
/**************************************************************************
* Public Functions
**************************************************************************/
/**************************************************************************
* Name: up_lowputc
*
* Description:
* Output one byte on the serial console
*
**************************************************************************/
void up_lowputc(char ch)
{
/* Wait for the transmitter to be available */
while ((getreg32(SAM3U_CONSOLE_BASE+SAM3U_UART_SR_OFFSET) & UART_INT_TXEMPTY) == 0);
/* Send the character */
putreg32((uint32_t)ch, SAM3U_CONSOLE_BASE+SAM3U_UART_THR_OFFSET);
}
/**************************************************************************
* Name: sam3u_lowsetup
*
* Description:
* This performs basic initialization of the USART used for the serial
* console. Its purpose is to get the console output availabe as soon
* as possible.
*
**************************************************************************/
void sam3u_lowsetup(void)
{
uint32_t regval;
/* Enable clocking for all selected UART/USARTs */
regval = 0;
#ifdef CONFIG_SAM3U_UART
regval |= (1 << SAM3U_PID_UART);
#endif
#ifdef CONFIG_SAM3U_USART0
regval |= (1 << SAM3U_PID_USART0);
#endif
#ifdef CONFIG_SAM3U_USART1
regval |= (1 << SAM3U_PID_USART1);
#endif
#ifdef CONFIG_SAM3U_USART2
regval |= (1 << SAM3U_PID_USART2);
#endif
#ifdef CONFIG_SAM3U_USART3
regval |= (1 << SAM3U_PID_USART3);
#endif
putreg32(regval, SAM3U_PMC_PCER);
/* Configure UART pins for all selected UART/USARTs */
#ifdef CONFIG_SAM3U_UART
(void)sam3u_configgpio(GPIO_UART_RXD);
(void)sam3u_configgpio(GPIO_UART_TXD);
#endif
#ifdef CONFIG_SAM3U_USART0
(void)sam3u_configgpio(GPIO_USART0_RXD);
(void)sam3u_configgpio(GPIO_USART0_TXD);
(void)sam3u_configgpio(GPIO_USART0_CTS);
(void)sam3u_configgpio(GPIO_USART0_RTS);
#endif
#ifdef CONFIG_SAM3U_USART1
(void)sam3u_configgpio(GPIO_USART1_RXD);
(void)sam3u_configgpio(GPIO_USART1_TXD);
(void)sam3u_configgpio(GPIO_USART1_CTS);
(void)sam3u_configgpio(GPIO_USART1_RTS);
#endif
#ifdef CONFIG_SAM3U_USART2
(void)sam3u_configgpio(GPIO_USART2_RXD);
(void)sam3u_configgpio(GPIO_USART2_TXD);
(void)sam3u_configgpio(GPIO_USART2_CTS);
(void)sam3u_configgpio(GPIO_USART2_RTS);
#endif
#ifdef CONFIG_SAM3U_USART3
(void)sam3u_configgpio(GPIO_USART3_RXD);
(void)sam3u_configgpio(GPIO_USART3_TXD);
(void)sam3u_configgpio(GPIO_USART3_CTS);
(void)sam3u_configgpio(GPIO_USART3_RTS);
#endif
#ifdef GPIO_CONSOLE_RXD
#endif
#ifdef GPIO_CONSOLE_TXD
(void)sam3u_configgpio(GPIO_CONSOLE_TXD);
#endif
#ifdef GPIO_CONSOLE_CTS
(void)sam3u_configgpio(GPIO_CONSOLE_CTS);
#endif
#ifdef GPIO_CONSOLE_RTS
(void)sam3u_configgpio(GPIO_CONSOLE_RTS);
#endif
/* Configure the console (only) */
#if defined(HAVE_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
/* Reset and disable receiver and transmitter */
putreg32((UART_CR_RSTRX|UART_CR_RSTTX|UART_CR_RXDIS|UART_CR_TXDIS),
SAM3U_CONSOLE_BASE+SAM3U_UART_CR_OFFSET);
/* Disable all interrupts */
putreg32(0xffffffff, SAM3U_CONSOLE_BASE+SAM3U_UART_IDR_OFFSET);
/* Set up the mode register */
putreg32(MR_VALUE, SAM3U_CONSOLE_BASE+SAM3U_UART_MR_OFFSET);
/* Configure the console baud */
putreg32(((SAM3U_MCK_FREQUENCY + (SAM3U_CONSOLE_BAUD << 3))/(SAM3U_CONSOLE_BAUD << 4)),
SAM3U_CONSOLE_BASE+SAM3U_UART_BRGR_OFFSET);
/* Enable receiver & transmitter */
putreg32((UART_CR_RXEN|UART_CR_TXEN),
SAM3U_CONSOLE_BASE+SAM3U_UART_CR_OFFSET);
#endif
}
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