/************************************************************************** * arch/arm/src/sam3u/sam3u_lowputc.c * * Copyright (C) 2010 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #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 }