376 lines
14 KiB
C
376 lines
14 KiB
C
/**************************************************************************
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* arch/arm/src/tiva/tiva_lowputc.c
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*
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* Copyright (C) 2009-2010, 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/board/board.h>
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#include "chip.h"
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#include "up_arch.h"
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#include "up_internal.h"
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#include "tiva_enablepwr.h"
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#include "tiva_enableclks.h"
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#include "tiva_periphrdy.h"
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#include "tiva_gpio.h"
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#include "chip/tiva_pinmap.h"
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#include "tiva_lowputc.h"
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/**************************************************************************
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* Pre-processor Definitions
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**************************************************************************/
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/* Configuration **********************************************************/
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/* Select UART parameters for the selected console */
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#if defined(CONFIG_UART0_SERIAL_CONSOLE)
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# define TIVA_CONSOLE_UART 0
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# define TIVA_CONSOLE_BASE TIVA_UART0_BASE
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# define TIVA_CONSOLE_BAUD CONFIG_UART0_BAUD
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# define TIVA_CONSOLE_BITS CONFIG_UART0_BITS
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# define TIVA_CONSOLE_PARITY CONFIG_UART0_PARITY
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# define TIVA_CONSOLE_2STOP CONFIG_UART0_2STOP
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#elif defined(CONFIG_UART1_SERIAL_CONSOLE)
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# define TIVA_CONSOLE_UART 1
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# define TIVA_CONSOLE_BASE TIVA_UART1_BASE
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# define TIVA_CONSOLE_BAUD CONFIG_UART1_BAUD
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# define TIVA_CONSOLE_BITS CONFIG_UART1_BITS
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# define TIVA_CONSOLE_PARITY CONFIG_UART1_PARITY
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# define TIVA_CONSOLE_2STOP CONFIG_UART1_2STOP
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#elif defined(CONFIG_UART2_SERIAL_CONSOLE)
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# define TIVA_CONSOLE_UART 2
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# define TIVA_CONSOLE_BASE TIVA_UART2_BASE
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# define TIVA_CONSOLE_BAUD CONFIG_UART2_BAUD
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# define TIVA_CONSOLE_BITS CONFIG_UART2_BITS
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# define TIVA_CONSOLE_PARITY CONFIG_UART2_PARITY
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# define TIVA_CONSOLE_2STOP CONFIG_UART2_2STOP
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#elif defined(CONFIG_UART3_SERIAL_CONSOLE)
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# define TIVA_CONSOLE_UART 3
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# define TIVA_CONSOLE_BASE TIVA_UART3_BASE
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# define TIVA_CONSOLE_BAUD CONFIG_UART3_BAUD
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# define TIVA_CONSOLE_BITS CONFIG_UART3_BITS
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# define TIVA_CONSOLE_PARITY CONFIG_UART3_PARITY
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# define TIVA_CONSOLE_2STOP CONFIG_UART3_2STOP
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#elif defined(CONFIG_UART4_SERIAL_CONSOLE)
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# define TIVA_CONSOLE_UART 4
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# define TIVA_CONSOLE_BASE TIVA_UART4_BASE
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# define TIVA_CONSOLE_BAUD CONFIG_UART4_BAUD
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# define TIVA_CONSOLE_BITS CONFIG_UART4_BITS
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# define TIVA_CONSOLE_PARITY CONFIG_UART4_PARITY
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# define TIVA_CONSOLE_2STOP CONFIG_UART4_2STOP
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#elif defined(CONFIG_UART5_SERIAL_CONSOLE)
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# define TIVA_CONSOLE_UART 5
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# define TIVA_CONSOLE_BASE TIVA_UART5_BASE
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# define TIVA_CONSOLE_BAUD CONFIG_UART5_BAUD
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# define TIVA_CONSOLE_BITS CONFIG_UART5_BITS
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# define TIVA_CONSOLE_PARITY CONFIG_UART5_PARITY
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# define TIVA_CONSOLE_2STOP CONFIG_UART5_2STOP
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#elif defined(CONFIG_UART6_SERIAL_CONSOLE)
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# define TIVA_CONSOLE_UART 6
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# define TIVA_CONSOLE_BASE TIVA_UART6_BASE
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# define TIVA_CONSOLE_BAUD CONFIG_UART6_BAUD
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# define TIVA_CONSOLE_BITS CONFIG_UART6_BITS
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# define TIVA_CONSOLE_PARITY CONFIG_UART6_PARITY
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# define TIVA_CONSOLE_2STOP CONFIG_UART6_2STOP
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#elif defined(CONFIG_UART7_SERIAL_CONSOLE)
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# define TIVA_CONSOLE_UART 7
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# define TIVA_CONSOLE_BASE TIVA_UART7_BASE
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# define TIVA_CONSOLE_BAUD CONFIG_UART7_BAUD
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# define TIVA_CONSOLE_BITS CONFIG_UART7_BITS
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# define TIVA_CONSOLE_PARITY CONFIG_UART7_PARITY
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# define TIVA_CONSOLE_2STOP CONFIG_UART7_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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/* Get LCRH settings */
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#if TIVA_CONSOLE_BITS == 5
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# define UART_LCRH_NBITS UART_LCRH_WLEN_5BITS
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#elif TIVA_CONSOLE_BITS == 6
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# define UART_LCRH_NBITS UART_LCRH_WLEN_6BITS
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#elif TIVA_CONSOLE_BITS == 7
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# define UART_LCRH_NBITS UART_LCRH_WLEN_7BITS
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#elif TIVA_CONSOLE_BITS == 8
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# define UART_LCRH_NBITS UART_LCRH_WLEN_8BITS
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#else
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# error "Number of bits not supported"
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#endif
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#if TIVA_CONSOLE_PARITY == 0
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# define UART_LCRH_PARITY (0)
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#elif TIVA_CONSOLE_PARITY == 1
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# define UART_LCRH_PARITY UART_LCRH_PEN
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#elif TIVA_CONSOLE_PARITY == 2
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# define UART_LCRH_PARITY (UART_LCRH_PEN|UART_LCRH_EPS)
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#else
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# error "Invalid parity selection"
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#endif
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#if TIVA_CONSOLE_2STOP != 0
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# define UART_LCRH_NSTOP UART_LCRH_STP2
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#else
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# define UART_LCRH_NSTOP (0)
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#endif
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#define UART_LCRH_VALUE (UART_LCRH_NBITS|UART_LCRH_PARITY|UART_LCRH_NSTOP|UART_LCRH_FEN)
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/* Calculate BAUD rate from the SYS clock:
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*
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* "The baud-rate divisor is a 22-bit number consisting of a 16-bit integer and a 6-bit
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* fractional part. The number formed by these two values is used by the baud-rate generator
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* to determine the bit period. Having a fractional baud-rate divider allows the UART to
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* generate all the standard baud rates.
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*
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* "The 16-bit integer is loaded through the UART Integer Baud-Rate Divisor (UARTIBRD)
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* register ... and the 6-bit fractional part is loaded with the UART Fractional Baud-Rate
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* Divisor (UARTFBRD) register... The baud-rate divisor (BRD) has the following relationship
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* to the system clock (where BRDI is the integer part of the BRD and BRDF is the fractional
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* part, separated by a decimal place.):
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*
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* "BRD = BRDI + BRDF = UARTSysClk / (16 * Baud Rate)
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*
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* "where UARTSysClk is the system clock connected to the UART. The 6-bit fractional number
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* (that is to be loaded into the DIVFRAC bit field in the UARTFBRD register) can be calculated
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* by taking the fractional part of the baud-rate divisor, multiplying it by 64, and adding 0.5
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* to account for rounding errors:
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*
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* "UARTFBRD[DIVFRAC] = integer(BRDF * 64 + 0.5)
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*
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* "The UART generates an internal baud-rate reference clock at 16x the baud-rate (referred
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* to as Baud16). This reference clock is divided by 16 to generate the transmit clock, and is
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* used for error detection during receive operations.
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*
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* "Along with the UART Line Control, High Byte (UARTLCRH) register ..., the UARTIBRD and
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* UARTFBRD registers form an internal 30-bit register. This internal register is only
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* updated when a write operation to UARTLCRH is performed, so any changes to the baud-rate
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* divisor must be followed by a write to the UARTLCRH register for the changes to take effect. ..."
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*/
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#define TIVA_BRDDEN (16 * TIVA_CONSOLE_BAUD)
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#define TIVA_BRDI (SYSCLK_FREQUENCY / TIVA_BRDDEN)
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#define TIVA_REMAINDER (SYSCLK_FREQUENCY - TIVA_BRDDEN * TIVA_BRDI)
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#define TIVA_DIVFRAC ((TIVA_REMAINDER * 64 + (TIVA_BRDDEN/2)) / TIVA_BRDDEN)
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/* For example: TIVA_CONSOLE_BAUD = 115,200, SYSCLK_FREQUENCY = 50,000,000:
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*
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* TIVA_BRDDEN = (16 * 115,200) = 1,843,200
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* TIVA_BRDI = 50,000,000 / 1,843,200 = 27
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* TIVA_REMAINDER = 50,000,000 - 1,843,200 * 27 = 233,600
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* TIVA_DIVFRAC = (233,600 * 64 + 921,600) / 1,843,200 = 8
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*
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* Which should yied BAUD = 50,000,000 / (16 * (27 + 8/64)) = 115207.37
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*/
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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_SERIAL_CONSOLE
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/* Wait until the TX FIFO is not full */
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while ((getreg32(TIVA_CONSOLE_BASE+TIVA_UART_FR_OFFSET) & UART_FR_TXFF) != 0);
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/* Then send the character */
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putreg32((uint32_t)ch, TIVA_CONSOLE_BASE+TIVA_UART_DR_OFFSET);
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#endif
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}
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/**************************************************************************
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* Name: up_lowsetup
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*
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* Description:
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* This performs basic initialization of the UART 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 up_lowsetup(void)
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{
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#if defined(HAVE_SERIAL_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
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uint32_t ctl;
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#endif
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/* Enable the selected UARTs and configure GPIO pins needed by the
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* the selected UARTs. NOTE: The serial driver later depends on
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* this pin configuration -- whether or not a serial console is selected.
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*
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* - Enable Power (TM4C129 family only): Applies power (only) to the UART
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* peripheral. This is not an essential step since enabling clocking
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* will also apply power. The only significance is that the UART state
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* will be retained if the UART clocking is subsequently disabled.
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* - Enable Clocking (All families): Applies both power and clocking to
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* the UART peripheral, bringing it a fully functional state.
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*/
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#ifdef CONFIG_TIVA_UART0
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tiva_uart0_enablepwr();
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tiva_uart0_enableclk();
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tiva_configgpio(GPIO_UART0_RX);
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tiva_configgpio(GPIO_UART0_TX);
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#endif
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#ifdef CONFIG_TIVA_UART1
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tiva_uart1_enablepwr();
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tiva_uart1_enableclk();
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tiva_configgpio(GPIO_UART1_RX);
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tiva_configgpio(GPIO_UART1_TX);
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#endif
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#ifdef CONFIG_TIVA_UART2
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tiva_uart2_enablepwr();
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tiva_uart2_enableclk();
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tiva_configgpio(GPIO_UART2_RX);
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tiva_configgpio(GPIO_UART2_TX);
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#endif
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#ifdef CONFIG_TIVA_UART3
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tiva_uart3_enablepwr();
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tiva_uart3_enableclk();
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tiva_configgpio(GPIO_UART3_RX);
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tiva_configgpio(GPIO_UART3_TX);
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#endif
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#ifdef CONFIG_TIVA_UART4
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tiva_uart4_enablepwr();
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tiva_uart4_enableclk();
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tiva_configgpio(GPIO_UART4_RX);
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tiva_configgpio(GPIO_UART4_TX);
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#endif
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#ifdef CONFIG_TIVA_UART5
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tiva_uart5_enablepwr();
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tiva_uart5_enableclk();
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tiva_configgpio(GPIO_UART5_RX);
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tiva_configgpio(GPIO_UART5_TX);
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#endif
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#ifdef CONFIG_TIVA_UART6
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tiva_uart6_enablepwr();
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tiva_uart6_enableclk();
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tiva_configgpio(GPIO_UART6_RX);
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tiva_configgpio(GPIO_UART6_TX);
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#endif
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#ifdef CONFIG_TIVA_UART7
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tiva_uart7_enablepwr();
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tiva_uart7_enableclk();
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tiva_configgpio(GPIO_UART7_RX);
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tiva_configgpio(GPIO_UART7_TX);
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#endif
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/* Enable the selected console device */
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#if defined(HAVE_SERIAL_CONSOLE) && !defined(CONFIG_SUPPRESS_UART_CONFIG)
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#ifdef TIVA_SYSCON_PRUART
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/* Wait for the console UART to be ready before writing to the UART
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* registers.
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*/
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while (!tiva_periphrdy(TIVA_SYSCON_PRUART,
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SYSCON_PRUART(TIVA_CONSOLE_UART)));
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#endif
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/* Disable the UART by clearing the UARTEN bit in the UART CTL register */
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ctl = getreg32(TIVA_CONSOLE_BASE+TIVA_UART_CTL_OFFSET);
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ctl &= ~UART_CTL_UARTEN;
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putreg32(ctl, TIVA_CONSOLE_BASE+TIVA_UART_CTL_OFFSET);
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/* Write the integer portion of the BRD to the UART IBRD register */
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putreg32(TIVA_BRDI, TIVA_CONSOLE_BASE+TIVA_UART_IBRD_OFFSET);
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/* Write the fractional portion of the BRD to the UART FBRD register */
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putreg32(TIVA_DIVFRAC, TIVA_CONSOLE_BASE+TIVA_UART_FBRD_OFFSET);
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/* Write the desired serial parameters to the UART LCRH register */
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putreg32(UART_LCRH_VALUE, TIVA_CONSOLE_BASE+TIVA_UART_LCRH_OFFSET);
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/* Enable the UART by setting the UARTEN bit in the UART CTL register */
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ctl |= (UART_CTL_UARTEN|UART_CTL_TXE|UART_CTL_RXE);
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putreg32(ctl, TIVA_CONSOLE_BASE+TIVA_UART_CTL_OFFSET);
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#endif
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}
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