359 lines
12 KiB
C
359 lines
12 KiB
C
/******************************************************************************
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* arch/mips/src/pic32mx/pic32mx-lowconsole.c
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*
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* Copyright (C) 2011-2012 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 <assert.h>
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#include <debug.h>
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#include <arch/irq.h>
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#include <arch/board/board.h>
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#include "up_arch.h"
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#include "up_internal.h"
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#include "pic32mx-config.h"
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#include "pic32mx-internal.h"
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/******************************************************************************
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* Private Definitions
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******************************************************************************/
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/* Select UART parameters for the selected console */
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#ifdef HAVE_SERIAL_CONSOLE
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# if defined(CONFIG_UART1_SERIAL_CONSOLE)
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# define PIC32MX_CONSOLE_BASE PIC32MX_UART1_K1BASE
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# define PIC32MX_CONSOLE_BAUD CONFIG_UART1_BAUD
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# define PIC32MX_CONSOLE_BITS CONFIG_UART1_BITS
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# define PIC32MX_CONSOLE_PARITY CONFIG_UART1_PARITY
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# define PIC32MX_CONSOLE_2STOP CONFIG_UART1_2STOP
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# elif defined(CONFIG_UART2_SERIAL_CONSOLE)
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# define PIC32MX_CONSOLE_BASE PIC32MX_UART2_K1BASE
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# define PIC32MX_CONSOLE_BAUD CONFIG_UART2_BAUD
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# define PIC32MX_CONSOLE_BITS CONFIG_UART2_BITS
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# define PIC32MX_CONSOLE_PARITY CONFIG_UART2_PARITY
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# define PIC32MX_CONSOLE_2STOP CONFIG_UART2_2STOP
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# elif defined(CONFIG_UART3_SERIAL_CONSOLE)
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# define PIC32MX_CONSOLE_BASE PIC32MX_UART3_K1BASE
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# define PIC32MX_CONSOLE_BAUD CONFIG_UART3_BAUD
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# define PIC32MX_CONSOLE_BITS CONFIG_UART3_BITS
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# define PIC32MX_CONSOLE_PARITY CONFIG_UART3_PARITY
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# define PIC32MX_CONSOLE_2STOP CONFIG_UART3_2STOP
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# elif defined(CONFIG_UART4_SERIAL_CONSOLE)
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# define PIC32MX_CONSOLE_BASE PIC32MX_UART4_K1BASE
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# define PIC32MX_CONSOLE_BAUD CONFIG_UART4_BAUD
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# define PIC32MX_CONSOLE_BITS CONFIG_UART4_BITS
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# define PIC32MX_CONSOLE_PARITY CONFIG_UART4_PARITY
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# define PIC32MX_CONSOLE_2STOP CONFIG_UART4_2STOP
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# elif defined(CONFIG_UART5_SERIAL_CONSOLE)
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# define PIC32MX_CONSOLE_BASE PIC32MX_UART5_K1BASE
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# define PIC32MX_CONSOLE_BAUD CONFIG_UART5_BAUD
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# define PIC32MX_CONSOLE_BITS CONFIG_UART5_BITS
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# define PIC32MX_CONSOLE_PARITY CONFIG_UART5_PARITY
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# define PIC32MX_CONSOLE_2STOP CONFIG_UART5_2STOP
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# elif defined(CONFIG_UART6_SERIAL_CONSOLE)
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# define PIC32MX_CONSOLE_BASE PIC32MX_UART6_K1BASE
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# define PIC32MX_CONSOLE_BAUD CONFIG_UART6_BAUD
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# define PIC32MX_CONSOLE_BITS CONFIG_UART6_BITS
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# define PIC32MX_CONSOLE_PARITY CONFIG_UART6_PARITY
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# define PIC32MX_CONSOLE_2STOP CONFIG_UART6_2STOP
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# else
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# error "No CONFIG_UARTn_SERIAL_CONSOLE Setting"
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# endif
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#endif
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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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* Name: pic32mx_putreg
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*
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* Description:
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* Write a value to a UART register
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*
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******************************************************************************/
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#ifdef HAVE_UART_DEVICE
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static inline void pic32mx_putreg(uintptr_t uart_base, unsigned int offset,
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uint32_t value)
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{
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putreg32(value, uart_base + offset);
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}
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#endif
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/******************************************************************************
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* Name: pic32mx_getreg
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*
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* Description:
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* Get a value from a UART register
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*
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******************************************************************************/
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#ifdef HAVE_UART_DEVICE
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static inline uint32_t pic32mx_getreg(uintptr_t uart_base,
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unsigned int offset)
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{
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return getreg32(uart_base + offset);
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}
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#endif
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/******************************************************************************
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* Name: pic32mx_uartsetbaud
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*
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* Description:
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* Configure the UART baud rate.
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*
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* With BRGH=0
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* BAUD = PBCLK / 16 / (BRG+1)
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* BRG = PBCLK / 16 / BAUD - 1
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* With BRGH=1
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* BAUD = PBCLK / 4 / (BRG+1)
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* BRG = PBCLK / 4 / BAUD - 1
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*
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*
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******************************************************************************/
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#ifdef HAVE_UART_DEVICE
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static void pic32mx_uartsetbaud(uintptr_t uart_base, uint32_t baudrate)
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{
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uint32_t tmp;
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uint32_t brg;
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unsigned int mode;
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/* We want the largest value of BRG divisor possible (for the best accuracy).
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* Subject to BRG <= 65536.
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*/
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tmp = BOARD_PBCLOCK / baudrate;
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/* Try BRGH=1 first. This will select the 4x divisor and will produce the
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* larger BRG divisor, given all other things equal.
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*/
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brg = (tmp + 2) >> 2;
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mode = PIC32MX_UART_MODESET_OFFSET;
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if (brg > 65536)
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{
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/* Nope, too big.. try BRGH=0 */
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brg = (tmp + 8) >> 4;
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mode = PIC32MX_UART_MODECLR_OFFSET;
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}
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DEBUGASSERT(brg <= 65536);
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/* Set the BRG divisor */
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pic32mx_putreg(uart_base, mode, UART_MODE_BRGH);
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pic32mx_putreg(uart_base, PIC32MX_UART_BRG_OFFSET, brg);
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}
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#endif
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/******************************************************************************
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* Public Functions
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******************************************************************************/
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/******************************************************************************
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* Name: pic32mx_uartreset
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*
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* Description:
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* Reset hardware and disable Rx and Tx.
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*
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******************************************************************************/
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#ifdef HAVE_UART_DEVICE
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void pic32mx_uartreset(uintptr_t uart_base)
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{
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/* Doesn't reset the hardware... just shuts it down */
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pic32mx_putreg(uart_base, PIC32MX_UART_STACLR_OFFSET,
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UART_STA_UTXEN | UART_STA_URXEN);
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pic32mx_putreg(uart_base, PIC32MX_UART_MODECLR_OFFSET, UART_MODE_ON);
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}
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#endif
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/******************************************************************************
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* Name: pic32mx_uartconfigure
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*
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* Description:
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* Configure a UART as a RS-232 UART.
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*
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******************************************************************************/
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#ifdef HAVE_UART_DEVICE
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void pic32mx_uartconfigure(uintptr_t uart_base, uint32_t baudrate,
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unsigned int parity, unsigned int nbits, bool stop2)
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{
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/* Clear mode and sta bits */
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pic32mx_putreg(uart_base, PIC32MX_UART_MODECLR_OFFSET,
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UART_MODE_STSEL | UART_MODE_PDSEL_MASK | UART_MODE_BRGH |
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UART_MODE_RXINV | UART_MODE_WAKE | UART_MODE_LPBACK |
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UART_MODE_UEN_MASK | UART_MODE_RTSMD | UART_MODE_IREN |
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UART_MODE_SIDL | UART_MODE_ON);
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/* Configure the FIFOs:
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*
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* RX: Interrupt at 6 of 8 (for 8-deep FIFO) or 3 o 4 (4-deep FIFO)
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* TX: Interrupt on FIFO empty
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* Invert transmit polarity.
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*
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* NOTE that there are not many options on trigger TX interrupts. The FIFO not
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* full might generate better through-put but with a higher interrupt rate. FIFO
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* empty should lower the interrupt rate but result in a burstier output. If
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* you change this, please read the comment for acknowledging the interrupt in
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* pic32mx-serial.c
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*/
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#ifdef UART_STA_URXISEL_RXB6
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pic32mx_putreg(uart_base, PIC32MX_UART_STACLR_OFFSET,
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UART_STA_UTXINV | UART_STA_UTXISEL_TXBE | UART_STA_URXISEL_RXB6);
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#else
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pic32mx_putreg(uart_base, PIC32MX_UART_STACLR_OFFSET,
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UART_STA_UTXINV | UART_STA_UTXISEL_TXBE | UART_STA_URXISEL_RXB3);
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#endif
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/* Configure the FIFO interrupts */
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pic32mx_putreg(uart_base, PIC32MX_UART_STASET_OFFSET,
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UART_STA_UTXISEL_TXBNF | UART_STA_URXISEL_RECVD);
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/* Configure word size and parity */
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if (nbits == 9)
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{
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DEBUGASSERT(parity == 0);
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pic32mx_putreg(uart_base, PIC32MX_UART_MODESET_OFFSET,
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UART_MODE_PDSEL_9NONE);
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}
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else
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{
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DEBUGASSERT(nbits == 8);
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if (parity == 1)
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{
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pic32mx_putreg(uart_base, PIC32MX_UART_MODESET_OFFSET,
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UART_MODE_PDSEL_8ODD);
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}
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else if (parity == 2)
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{
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pic32mx_putreg(uart_base, PIC32MX_UART_MODESET_OFFSET,
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UART_MODE_PDSEL_8EVEN);
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}
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}
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/* Configure 1 or 2 stop bits */
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if (stop2)
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{
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pic32mx_putreg(uart_base, PIC32MX_UART_MODESET_OFFSET,
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UART_MODE_STSEL);
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}
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/* Set the BRG divisor */
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pic32mx_uartsetbaud(uart_base, baudrate);
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/* Enable the UART */
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pic32mx_putreg(uart_base, PIC32MX_UART_STASET_OFFSET,
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UART_STA_UTXEN | UART_STA_URXEN);
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pic32mx_putreg(uart_base, PIC32MX_UART_MODESET_OFFSET,
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UART_MODE_ON);
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}
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#endif
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/******************************************************************************
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* Name: pic32mx_consoleinit
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*
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* Description:
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* Initialize a low-level console for debug output. This function is called
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* very early in the intialization sequence to configure the serial console
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* UART (only).
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*
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******************************************************************************/
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#ifdef HAVE_SERIAL_CONSOLE
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void pic32mx_consoleinit(void)
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{
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pic32mx_uartconfigure(PIC32MX_CONSOLE_BASE, PIC32MX_CONSOLE_BAUD,
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PIC32MX_CONSOLE_PARITY, PIC32MX_CONSOLE_BITS,
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PIC32MX_CONSOLE_2STOP);
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}
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#endif
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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_SERIAL_CONSOLE
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/* Wait for the transmit buffer not full */
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while ((pic32mx_getreg(PIC32MX_CONSOLE_BASE, PIC32MX_UART_STA_OFFSET) & UART_STA_UTXBF) != 0);
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/* Then write the character to the TX data register */
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pic32mx_putreg(PIC32MX_CONSOLE_BASE, PIC32MX_UART_TXREG_OFFSET, (uint32_t)ch);
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#endif
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}
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