236 lines
8.2 KiB
C
236 lines
8.2 KiB
C
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/****************************************************************************
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* arch/arm/src/xmc4/xmc4_lowputc.c
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*
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* Copyright (C) 2017 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/irq.h>
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#include <arch/board/board.h>
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#include "up_internal.h"
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#include "up_arch.h"
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#include "xmc4_config.h"
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#include "chip/xmc4_uart.h"
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#include "chip/xmc4_pinmux.h"
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Select UART parameters for the selected console */
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#if defined(HAVE_UART_CONSOLE)
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# if defined(CONFIG_UART0_SERIAL_CONSOLE)
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# define CONSOLE_BASE XMC4_UART0_BASE
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# define CONSOLE_FREQ BOARD_CORECLK_FREQ
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# define CONSOLE_BAUD CONFIG_UART0_BAUD
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# define CONSOLE_BITS CONFIG_UART0_BITS
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# define CONSOLE_2STOP CONFIG_UART0_2STOP
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# define CONSOLE_PARITY CONFIG_UART0_PARITY
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# elif defined(CONFIG_UART1_SERIAL_CONSOLE)
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# define CONSOLE_BASE XMC4_UART1_BASE
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# define CONSOLE_FREQ BOARD_CORECLK_FREQ
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# define CONSOLE_BAUD CONFIG_UART1_BAUD
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# define CONSOLE_BITS CONFIG_UART1_BITS
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# define CONSOLE_2STOP CONFIG_UART1_2STOP
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# define CONSOLE_PARITY CONFIG_UART1_PARITY
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# elif defined(CONFIG_UART2_SERIAL_CONSOLE)
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# define CONSOLE_BASE XMC4_UART2_BASE
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# define CONSOLE_FREQ BOARD_BUS_FREQ
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# define CONSOLE_BAUD CONFIG_UART2_BAUD
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# define CONSOLE_BITS CONFIG_UART2_BITS
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# define CONSOLE_2STOP CONFIG_UART2_2STOP
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# define CONSOLE_PARITY CONFIG_UART2_PARITY
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# elif defined(CONFIG_UART3_SERIAL_CONSOLE)
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# define CONSOLE_BASE XMC4_UART3_BASE
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# define CONSOLE_FREQ BOARD_BUS_FREQ
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# define CONSOLE_BAUD CONFIG_UART3_BAUD
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# define CONSOLE_BITS CONFIG_UART3_BITS
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# define CONSOLE_2STOP CONFIG_UART3_2STOP
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# define CONSOLE_PARITY CONFIG_UART3_PARITY
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# elif defined(CONFIG_UART4_SERIAL_CONSOLE)
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# define CONSOLE_BASE XMC4_UART4_BASE
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# define CONSOLE_FREQ BOARD_BUS_FREQ
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# define CONSOLE_BAUD CONFIG_UART4_BAUD
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# define CONSOLE_BITS CONFIG_UART4_BITS
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# define CONSOLE_2STOP CONFIG_UART4_2STOP
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# define CONSOLE_PARITY CONFIG_UART4_PARITY
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# elif defined(CONFIG_UART5_SERIAL_CONSOLE)
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# define CONSOLE_BASE XMC4_UART5_BASE
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# define CONSOLE_FREQ BOARD_BUS_FREQ
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# define CONSOLE_BAUD CONFIG_UART5_BAUD
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# define CONSOLE_BITS CONFIG_UART5_BITS
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# define CONSOLE_2STOP CONFIG_UART5_2STOP
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# define CONSOLE_PARITY CONFIG_UART5_PARITY
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# elif defined(HAVE_UART_CONSOLE)
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# error "No CONFIG_UARTn_SERIAL_CONSOLE Setting"
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# endif
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#endif /* HAVE_UART_CONSOLE */
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/****************************************************************************
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* Private Data
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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_UART_CONSOLE
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/* Wait until the transmit data register is "empty" (TDRE). This state
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* depends on the TX watermark setting and may not mean that the transmit
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* buffer is truly empty. It just means that we can now add another
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* character to the transmit buffer without exceeding the watermark.
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*
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* NOTE: UART0 has an 8-byte deep FIFO; the other UARTs have no FIFOs
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* (1-deep). There appears to be no way to know when the FIFO is not
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* full (other than reading the FIFO length and comparing the FIFO count).
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* Hence, the FIFOs are not used in this implementation and, as a result
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* TDRE indeed mean that the single output buffer is available.
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*
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* Performance on UART0 could be improved by enabling the FIFO and by
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* redesigning all of the FIFO status logic.
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*/
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#warning Missing logic
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/* Then write the character to the UART data register */
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#warning Missing logic
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}
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/****************************************************************************
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* Name: xmc4_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 available as soon
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* as possible.
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*
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****************************************************************************/
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void xmc4_lowsetup(void)
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{
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uint32_t regval;
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/* Enable peripheral clocking for all enabled UARTs. */
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#wanring Missing logic
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/* Configure UART pins for the all enabled UARTs */
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/* Configure the console (only) now. Other UARTs will be configured
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* when the serial driver is opened.
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*/
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xmc4_uart_configure(CONSOLE_BASE, CONSOLE_BAUD, CONSOLE_FREQ, \
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CONSOLE_PARITY, CONSOLE_BITS, CONSOLE_2STOP);
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#endif /* HAVE_UART_DEVICE */
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}
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/****************************************************************************
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* Name: xmc4_uart_reset
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*
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* Description:
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* Reset a UART.
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*
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****************************************************************************/
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#ifdef HAVE_UART_DEVICE
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void xmc4_uart_reset(uintptr_t uart_base)
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{
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uint8_t regval;
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/* Just disable the transmitter and receiver */
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#warning Missing logic
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}
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#endif
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/****************************************************************************
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* Name: xmc4_uart_configure
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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 xmc4_uart_configure(uintptr_t uart_base, uint32_t baud,
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uint32_t clock, unsigned int parity,
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unsigned int nbits, unsigned int stop2)
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{
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/* Disable the transmitter and receiver throughout the reconfiguration */
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#warning Missing logic
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/* Configure number of bits, stop bits and parity */
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#warning Missing logic
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/* Check for odd parity */
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#warning Missing logic
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/* Check for even parity */
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#warning Missing logic
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/* Check for 9-bit operation */
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#warning Missing logic
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/* Calculate baud settings (truncating) */
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#warning Missing logic
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/* Configure FIFOs */
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#warning Missing logic
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/* Enable RX and TX FIFOs */
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#warning Missing logic
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/* Now we can (re-)enable the transmitter and receiver */
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#warning Missing logic
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}
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#endif
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