diff options
Diffstat (limited to 'nuttx/arch/arm/src/sam34/sam_lowputc.c')
| -rw-r--r-- | nuttx/arch/arm/src/sam34/sam_lowputc.c | 336 |
1 files changed, 336 insertions, 0 deletions
diff --git a/nuttx/arch/arm/src/sam34/sam_lowputc.c b/nuttx/arch/arm/src/sam34/sam_lowputc.c new file mode 100644 index 000000000..00a3d3a89 --- /dev/null +++ b/nuttx/arch/arm/src/sam34/sam_lowputc.c @@ -0,0 +1,336 @@ +/************************************************************************** + * arch/arm/src/sam34/sam_lowputc.c + * + * Copyright (C) 2010, 2013 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 "sam_gpio.h" +#include "sam_lowputc.h" +#include "chip/sam_pmc.h" +#include "chip/sam_uart.h" +#include "chip/sam_pinmap.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_SAM34_USART0 +#endif +#ifndef CONFIG_USART1_ISUART +# undef CONFIG_SAM34_USART1 +#endif +#ifndef CONFIG_USART2_ISUART +# undef CONFIG_SAM34_USART2 +#endif +#ifndef CONFIG_USART3_ISUART +# undef CONFIG_SAM34_USART3 +#endif + +/* Is there a serial console? It could be on the UART, or USARTn */ + +#if defined(CONFIG_UART_SERIAL_CONSOLE) && defined(CONFIG_SAM34_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_SAM34_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_SAM34_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_SAM34_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_SAM34_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 SAM_CONSOLE_BASE SAM_UART_BASE +# define SAM_CONSOLE_BAUD CONFIG_UART_BAUD +# define SAM_CONSOLE_BITS CONFIG_UART_BITS +# define SAM_CONSOLE_PARITY CONFIG_UART_PARITY +# define SAM_CONSOLE_2STOP CONFIG_UART_2STOP +#elif defined(CONFIG_USART0_SERIAL_CONSOLE) +# define SAM_CONSOLE_BASE SAM_USART0_BASE +# define SAM_CONSOLE_BAUD CONFIG_USART0_BAUD +# define SAM_CONSOLE_BITS CONFIG_USART0_BITS +# define SAM_CONSOLE_PARITY CONFIG_USART0_PARITY +# define SAM_CONSOLE_2STOP CONFIG_USART0_2STOP +#elif defined(CONFIG_USART1_SERIAL_CONSOLE) +# define SAM_CONSOLE_BASE SAM_USART1_BASE +# define SAM_CONSOLE_BAUD CONFIG_USART1_BAUD +# define SAM_CONSOLE_BITS CONFIG_USART1_BITS +# define SAM_CONSOLE_PARITY CONFIG_USART1_PARITY +# define SAM_CONSOLE_2STOP CONFIG_USART1_2STOP +#elif defined(CONFIG_USART2_SERIAL_CONSOLE) +# define SAM_CONSOLE_BASE SAM_USART2_BASE +# define SAM_CONSOLE_BAUD CONFIG_USART2_BAUD +# define SAM_CONSOLE_BITS CONFIG_USART2_BITS +# define SAM_CONSOLE_PARITY CONFIG_USART2_PARITY +# define SAM_CONSOLE_2STOP CONFIG_USART2_2STOP +#elif defined(CONFIG_USART3_SERIAL_CONSOLE) +# define SAM_CONSOLE_BASE SAM_USART3_BASE +# define SAM_CONSOLE_BAUD CONFIG_USART3_BAUD +# define SAM_CONSOLE_BITS CONFIG_USART3_BITS +# define SAM_CONSOLE_PARITY CONFIG_USART3_PARITY +# define SAM_CONSOLE_2STOP CONFIG_USART3_2STOP +#else +# error "No CONFIG_U[S]ARTn_SERIAL_CONSOLE Setting" +#endif + +/* Select the settings for the mode register */ + +#if SAM_CONSOLE_BITS == 5 +# define MR_CHRL_VALUE USART_MR_CHRL_5BITS /* 5 bits */ +#elif SAM_CONSOLE_BITS == 6 +# define MR_CHRL_VALUE USART_MR_CHRL_6BITS /* 6 bits */ +#elif SAM_CONSOLE_BITS == 7 +# define MR_CHRL_VALUE USART_MR_CHRL_7BITS /* 7 bits */ +#elif SAM_CONSOLE_BITS == 8 +# define MR_CHRL_VALUE USART_MR_CHRL_8BITS /* 8 bits */ +#elif SAM_CONSOLE_BITS == 9 && !defined(CONFIG_UART_SERIAL_CONSOLE) +# define MR_CHRL_VALUE USART_MR_MODE9 +#else +# error "Invlaid number of bits" +#endif + +#if SAM_CONSOLE_PARITY == 1 +# define MR_PAR_VALUE UART_MR_PAR_ODD +#elif SAM_CONSOLE_PARITY == 2 +# define MR_PAR_VALUE UART_MR_PAR_EVEN +#else +# define MR_PAR_VALUE UART_MR_PAR_NONE +#endif + +#if SAM_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(SAM_CONSOLE_BASE + SAM_UART_SR_OFFSET) & UART_INT_TXEMPTY) == 0); + + /* Send the character */ + + putreg32((uint32_t)ch, SAM_CONSOLE_BASE + SAM_UART_THR_OFFSET); +} + +/************************************************************************** + * Name: sam_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 sam_lowsetup(void) +{ + uint32_t regval; + + /* Enable clocking for all selected UART/USARTs */ + + regval = 0; +#ifdef CONFIG_SAM34_UART + regval |= (1 << SAM_PID_UART); +#endif +#ifdef CONFIG_SAM34_USART0 + regval |= (1 << SAM_PID_USART0); +#endif +#ifdef CONFIG_SAM34_USART1 + regval |= (1 << SAM_PID_USART1); +#endif +#ifdef CONFIG_SAM34_USART2 + regval |= (1 << SAM_PID_USART2); +#endif +#ifdef CONFIG_SAM34_USART3 + regval |= (1 << SAM_PID_USART3); +#endif + putreg32(regval, SAM_PMC_PCER); + + /* Configure UART pins for all selected UART/USARTs */ + +#ifdef CONFIG_SAM34_UART + (void)sam_configgpio(GPIO_UART_RXD); + (void)sam_configgpio(GPIO_UART_TXD); +#endif +#ifdef CONFIG_SAM34_USART0 + (void)sam_configgpio(GPIO_USART0_RXD); + (void)sam_configgpio(GPIO_USART0_TXD); + (void)sam_configgpio(GPIO_USART0_CTS); + (void)sam_configgpio(GPIO_USART0_RTS); +#endif +#ifdef CONFIG_SAM34_USART1 + (void)sam_configgpio(GPIO_USART1_RXD); + (void)sam_configgpio(GPIO_USART1_TXD); + (void)sam_configgpio(GPIO_USART1_CTS); + (void)sam_configgpio(GPIO_USART1_RTS); +#endif +#ifdef CONFIG_SAM34_USART2 + (void)sam_configgpio(GPIO_USART2_RXD); + (void)sam_configgpio(GPIO_USART2_TXD); + (void)sam_configgpio(GPIO_USART2_CTS); + (void)sam_configgpio(GPIO_USART2_RTS); +#endif +#ifdef CONFIG_SAM34_USART3 + (void)sam_configgpio(GPIO_USART3_RXD); + (void)sam_configgpio(GPIO_USART3_TXD); + (void)sam_configgpio(GPIO_USART3_CTS); + (void)sam_configgpio(GPIO_USART3_RTS); +#endif + +#ifdef GPIO_CONSOLE_RXD +#endif +#ifdef GPIO_CONSOLE_TXD + (void)sam_configgpio(GPIO_CONSOLE_TXD); +#endif +#ifdef GPIO_CONSOLE_CTS + (void)sam_configgpio(GPIO_CONSOLE_CTS); +#endif +#ifdef GPIO_CONSOLE_RTS + (void)sam_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), + SAM_CONSOLE_BASE + SAM_UART_CR_OFFSET); + + /* Disable all interrupts */ + + putreg32(0xffffffff, SAM_CONSOLE_BASE + SAM_UART_IDR_OFFSET); + + /* Set up the mode register */ + + putreg32(MR_VALUE, SAM_CONSOLE_BASE + SAM_UART_MR_OFFSET); + + /* Configure the console baud */ + + putreg32(((SAM_MCK_FREQUENCY + (SAM_CONSOLE_BAUD << 3))/(SAM_CONSOLE_BAUD << 4)), + SAM_CONSOLE_BASE + SAM_UART_BRGR_OFFSET); + + /* Enable receiver & transmitter */ + + putreg32((UART_CR_RXEN | UART_CR_TXEN), + SAM_CONSOLE_BASE + SAM_UART_CR_OFFSET); +#endif +} + + |