2019-11-06 02:39:36 +01:00
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/****************************************************************************
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2015-11-15 14:58:08 +01:00
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* drivers/serial/serial_io.c
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2008-09-24 17:42:13 +02:00
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*
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2021-03-04 07:10:42 +01:00
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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2008-09-24 17:42:13 +02:00
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*
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2021-03-04 07:10:42 +01:00
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* http://www.apache.org/licenses/LICENSE-2.0
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2008-09-24 17:42:13 +02:00
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*
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2021-03-04 07:10:42 +01:00
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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2008-09-24 17:42:13 +02:00
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*
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2019-11-06 02:39:36 +01:00
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****************************************************************************/
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2008-09-24 17:42:13 +02:00
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2019-11-06 02:39:36 +01:00
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/****************************************************************************
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2008-09-24 17:42:13 +02:00
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* Included Files
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2019-11-06 02:39:36 +01:00
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****************************************************************************/
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2008-09-24 17:42:13 +02:00
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#include <nuttx/config.h>
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2009-12-15 15:25:14 +01:00
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2019-10-16 15:09:03 +02:00
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#ifdef CONFIG_SMP
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# include <nuttx/irq.h>
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#endif
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2021-04-29 11:02:34 +02:00
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#include <assert.h>
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2008-09-24 17:42:13 +02:00
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#include <sys/types.h>
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2009-12-15 15:25:14 +01:00
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#include <stdint.h>
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2008-09-24 17:42:13 +02:00
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#include <debug.h>
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2020-05-02 16:30:58 +02:00
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#include <nuttx/signal.h>
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2015-11-15 14:58:08 +01:00
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#include <nuttx/serial/serial.h>
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2008-09-24 17:42:13 +02:00
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2019-11-06 02:39:36 +01:00
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/****************************************************************************
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2008-09-24 17:42:13 +02:00
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* Public Functions
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2019-11-06 02:39:36 +01:00
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****************************************************************************/
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2008-09-24 17:42:13 +02:00
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2019-11-06 02:39:36 +01:00
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/****************************************************************************
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2008-09-24 17:42:13 +02:00
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* Name: uart_xmitchars
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*
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* Description:
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2019-11-06 02:39:36 +01:00
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* This function is called from the UART interrupt handler when an
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* interrupt is received indicating that there is more space in the
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* transmit FIFO. This function will send characters from the tail of
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* the xmit buffer while the driver write() logic adds data to the head
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* of the xmit buffer.
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2008-09-24 17:42:13 +02:00
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*
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2019-11-06 02:39:36 +01:00
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****************************************************************************/
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2008-09-24 17:42:13 +02:00
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void uart_xmitchars(FAR uart_dev_t *dev)
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{
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2009-12-15 15:25:14 +01:00
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uint16_t nbytes = 0;
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2008-11-18 00:22:27 +01:00
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2019-10-16 15:09:03 +02:00
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#ifdef CONFIG_SMP
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irqstate_t flags = enter_critical_section();
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#endif
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2013-06-14 00:18:25 +02:00
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/* Send while we still have data in the TX buffer & room in the fifo */
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2008-09-24 17:42:13 +02:00
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while (dev->xmit.head != dev->xmit.tail && uart_txready(dev))
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{
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2008-11-13 15:46:10 +01:00
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/* Send the next byte */
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2008-09-24 17:42:13 +02:00
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uart_send(dev, dev->xmit.buffer[dev->xmit.tail]);
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2008-11-18 00:22:27 +01:00
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nbytes++;
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2008-09-24 17:42:13 +02:00
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2008-11-13 15:46:10 +01:00
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/* Increment the tail index */
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2008-09-24 17:42:13 +02:00
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if (++(dev->xmit.tail) >= dev->xmit.size)
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{
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dev->xmit.tail = 0;
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}
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}
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|
2011-07-12 16:29:08 +02:00
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/* When all of the characters have been sent from the buffer disable the TX
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* interrupt.
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2013-06-14 00:18:25 +02:00
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*
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* Potential bug? If nbytes == 0 && (dev->xmit.head == dev->xmit.tail) &&
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* dev->xmitwaiting == true, then disabling the TX interrupt will leave
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* the uart_write() logic waiting to TX to complete with no TX interrupts.
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* Can that happen?
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2008-09-24 17:42:13 +02:00
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*/
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if (dev->xmit.head == dev->xmit.tail)
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{
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uart_disabletxint(dev);
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}
|
2008-11-18 00:22:27 +01:00
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2019-11-06 02:39:36 +01:00
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/* If any bytes were removed from the buffer, inform any waiters that
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* there is space available.
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2008-11-18 00:22:27 +01:00
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*/
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if (nbytes)
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{
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uart_datasent(dev);
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}
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2019-10-16 15:09:03 +02:00
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#ifdef CONFIG_SMP
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leave_critical_section(flags);
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#endif
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2008-09-24 17:42:13 +02:00
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}
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2019-11-06 02:39:36 +01:00
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/****************************************************************************
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2008-09-24 17:42:13 +02:00
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* Name: uart_receivechars
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*
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* Description:
|
2019-11-06 02:39:36 +01:00
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* This function is called from the UART interrupt handler when an
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* interrupt is received indicating that are bytes available in the
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2019-11-06 14:06:36 +01:00
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* receive FIFO. This function will add chars to head of receive buffer.
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2019-11-06 02:39:36 +01:00
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* Driver read() logic will take characters from the tail of the buffer.
|
2008-09-24 17:42:13 +02:00
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*
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2019-11-06 02:39:36 +01:00
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****************************************************************************/
|
2008-09-24 17:42:13 +02:00
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void uart_recvchars(FAR uart_dev_t *dev)
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{
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2014-12-27 15:15:41 +01:00
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FAR struct uart_buffer_s *rxbuf = &dev->recv;
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2014-12-27 14:43:06 +01:00
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#ifdef CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS
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unsigned int watermark;
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#endif
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2008-09-24 17:42:13 +02:00
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unsigned int status;
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2014-12-27 15:15:41 +01:00
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int nexthead = rxbuf->head + 1;
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2020-10-29 05:53:41 +01:00
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#if defined(CONFIG_TTY_SIGINT) || defined(CONFIG_TTY_SIGTSTP)
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2018-09-02 23:36:25 +02:00
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int signo = 0;
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#endif
|
2009-12-15 15:25:14 +01:00
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uint16_t nbytes = 0;
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2008-09-24 17:42:13 +02:00
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2014-12-27 15:15:41 +01:00
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if (nexthead >= rxbuf->size)
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2008-09-24 17:42:13 +02:00
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{
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nexthead = 0;
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}
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2014-12-27 14:43:06 +01:00
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#ifdef CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS
|
2018-09-02 23:36:25 +02:00
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/* Pre-calculate the watermark level that we will need to test against. */
|
2014-12-27 14:43:06 +01:00
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|
2019-11-06 02:39:36 +01:00
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watermark = (CONFIG_SERIAL_IFLOWCONTROL_UPPER_WATERMARK * rxbuf->size) /
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100;
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2014-12-27 14:43:06 +01:00
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#endif
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|
2019-11-06 02:39:36 +01:00
|
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/* Loop putting characters into the receive buffer until there are no
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* further characters to available.
|
2008-11-13 02:02:56 +01:00
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*/
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|
2011-07-12 16:29:08 +02:00
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while (uart_rxavailable(dev))
|
2008-09-24 17:42:13 +02:00
|
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{
|
2015-11-15 15:39:01 +01:00
|
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bool is_full = (nexthead == rxbuf->tail);
|
2014-05-08 17:00:33 +02:00
|
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|
char ch;
|
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|
|
|
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|
|
#ifdef CONFIG_SERIAL_IFLOWCONTROL
|
2014-12-27 15:00:48 +01:00
|
|
|
#ifdef CONFIG_SERIAL_IFLOWCONTROL_WATERMARKS
|
2015-11-15 15:39:01 +01:00
|
|
|
unsigned int nbuffered;
|
|
|
|
|
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|
/* How many bytes are buffered */
|
|
|
|
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|
if (rxbuf->head >= rxbuf->tail)
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|
|
{
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|
nbuffered = rxbuf->head - rxbuf->tail;
|
|
|
|
}
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|
else
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|
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|
{
|
|
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|
nbuffered = rxbuf->size - rxbuf->tail + rxbuf->head;
|
|
|
|
}
|
|
|
|
|
|
|
|
/* Is the level now above the watermark level that we need to report? */
|
|
|
|
|
|
|
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if (nbuffered >= watermark)
|
2014-12-27 14:43:06 +01:00
|
|
|
{
|
2020-09-24 12:11:44 +02:00
|
|
|
/* Let the lower level driver know that the watermark level has
|
|
|
|
* been crossed. It will probably activate RX flow control.
|
2015-11-15 15:39:01 +01:00
|
|
|
*/
|
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|
|
|
|
|
|
if (uart_rxflowcontrol(dev, nbuffered, true))
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|
|
{
|
|
|
|
/* Low-level driver activated RX flow control, exit loop now. */
|
|
|
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|
break;
|
|
|
|
}
|
2014-12-27 14:43:06 +01:00
|
|
|
}
|
|
|
|
#else
|
2020-09-24 12:11:44 +02:00
|
|
|
/* Check if RX buffer is full and allow serial low-level driver to
|
|
|
|
* pause processing. This allows proper utilization of hardware flow
|
|
|
|
* control.
|
2015-11-15 15:39:01 +01:00
|
|
|
*/
|
|
|
|
|
|
|
|
if (is_full)
|
2014-05-08 17:00:33 +02:00
|
|
|
{
|
2015-11-15 15:39:01 +01:00
|
|
|
if (uart_rxflowcontrol(dev, rxbuf->size, true))
|
|
|
|
{
|
|
|
|
/* Low-level driver activated RX flow control, exit loop now. */
|
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|
|
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|
break;
|
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|
|
}
|
2014-05-08 17:00:33 +02:00
|
|
|
}
|
2014-12-27 14:43:06 +01:00
|
|
|
#endif
|
2014-05-08 17:00:33 +02:00
|
|
|
#endif
|
|
|
|
|
2018-08-26 16:49:08 +02:00
|
|
|
/* Get this next character from the hardware */
|
|
|
|
|
2014-05-08 17:00:33 +02:00
|
|
|
ch = uart_receive(dev, &status);
|
2014-04-13 22:32:20 +02:00
|
|
|
|
2018-08-28 20:15:31 +02:00
|
|
|
#ifdef CONFIG_TTY_SIGINT
|
2020-09-24 12:11:44 +02:00
|
|
|
/* Is this the special character that will generate the SIGINT
|
|
|
|
* signal?
|
|
|
|
*/
|
2018-08-26 16:49:08 +02:00
|
|
|
|
2020-09-24 12:11:44 +02:00
|
|
|
if (dev->pid >= 0 && (dev->tc_lflag & ISIG) &&
|
|
|
|
ch == CONFIG_TTY_SIGINT_CHAR)
|
2018-08-26 16:49:08 +02:00
|
|
|
{
|
2018-08-28 17:15:29 +02:00
|
|
|
/* Yes.. note that the kill is needed and do not put the character
|
|
|
|
* into the Rx buffer. It should not be read as normal data.
|
2018-08-26 16:49:08 +02:00
|
|
|
*/
|
|
|
|
|
2018-09-02 23:36:25 +02:00
|
|
|
signo = SIGINT;
|
|
|
|
}
|
|
|
|
else
|
|
|
|
#endif
|
2020-10-29 05:53:41 +01:00
|
|
|
#ifdef CONFIG_TTY_SIGTSTP
|
|
|
|
/* Is this the special character that will generate the SIGTSTP
|
2020-09-24 12:11:44 +02:00
|
|
|
* signal?
|
|
|
|
*/
|
2018-09-02 23:36:25 +02:00
|
|
|
|
2020-09-24 12:11:44 +02:00
|
|
|
if (dev->pid >= 0 && (dev->tc_lflag & ISIG) &&
|
2020-10-29 05:53:41 +01:00
|
|
|
ch == CONFIG_TTY_SIGTSTP_CHAR)
|
2018-09-02 23:36:25 +02:00
|
|
|
{
|
|
|
|
#ifdef CONFIG_TTY_SIGINT
|
|
|
|
/* Give precedence to SIGINT */
|
|
|
|
|
|
|
|
if (signo == 0)
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
/* Note that the kill is needed and do not put the character
|
|
|
|
* into the Rx buffer. It should not be read as normal data.
|
|
|
|
*/
|
|
|
|
|
2020-10-29 05:53:41 +01:00
|
|
|
signo = SIGTSTP;
|
2018-09-02 23:36:25 +02:00
|
|
|
}
|
2018-08-26 16:49:08 +02:00
|
|
|
}
|
|
|
|
else
|
|
|
|
#endif
|
2021-04-29 11:02:34 +02:00
|
|
|
#ifdef CONFIG_TTY_FORCE_PANIC
|
|
|
|
/* Is this the special character that will generate the SIGTSTP
|
|
|
|
* signal?
|
|
|
|
*/
|
|
|
|
|
|
|
|
if ((dev->tc_lflag & ISIG) && ch == CONFIG_TTY_FORCE_PANIC_CHAR)
|
|
|
|
{
|
|
|
|
PANIC();
|
|
|
|
}
|
|
|
|
else
|
|
|
|
#endif
|
2021-12-15 06:40:45 +01:00
|
|
|
#ifdef CONFIG_TTY_LAUNCH
|
|
|
|
/* Is this the special character that will generate the SIGTSTP
|
|
|
|
* signal?
|
|
|
|
*/
|
|
|
|
|
|
|
|
if ((dev->tc_lflag & ISIG) && ch == CONFIG_TTY_LAUNCH_CHAR)
|
|
|
|
{
|
|
|
|
uart_launch();
|
|
|
|
}
|
|
|
|
else
|
|
|
|
#endif
|
2018-08-26 16:49:08 +02:00
|
|
|
|
2019-11-06 02:39:36 +01:00
|
|
|
/* If the RX buffer becomes full, then the serial data is discarded.
|
|
|
|
* This is necessary because on most serial hardware, you must read
|
|
|
|
* the data in order to clear the RX interrupt. An option on some
|
|
|
|
* hardware might be to simply disable RX interrupts until the RX
|
|
|
|
* buffer becomes non-FULL. However, that would probably just cause
|
|
|
|
* the overrun to occur in hardware (unless it has some large internal
|
|
|
|
* buffering).
|
2011-07-12 16:29:08 +02:00
|
|
|
*/
|
|
|
|
|
2014-05-08 17:00:33 +02:00
|
|
|
if (!is_full)
|
2011-07-12 16:29:08 +02:00
|
|
|
{
|
|
|
|
/* Add the character to the buffer */
|
2008-11-13 02:02:56 +01:00
|
|
|
|
2014-12-27 15:15:41 +01:00
|
|
|
rxbuf->buffer[rxbuf->head] = ch;
|
2011-07-12 16:29:08 +02:00
|
|
|
nbytes++;
|
2008-09-24 17:42:13 +02:00
|
|
|
|
2011-07-12 16:29:08 +02:00
|
|
|
/* Increment the head index */
|
2008-11-13 02:02:56 +01:00
|
|
|
|
2014-12-27 15:15:41 +01:00
|
|
|
rxbuf->head = nexthead;
|
|
|
|
if (++nexthead >= rxbuf->size)
|
2011-07-12 16:29:08 +02:00
|
|
|
{
|
|
|
|
nexthead = 0;
|
|
|
|
}
|
2008-09-24 17:42:13 +02:00
|
|
|
}
|
2008-11-18 00:22:27 +01:00
|
|
|
}
|
2008-09-24 17:42:13 +02:00
|
|
|
|
2015-11-12 21:16:19 +01:00
|
|
|
/* If any bytes were added to the buffer, inform any waiters there is new
|
2011-07-12 16:29:08 +02:00
|
|
|
* incoming data available.
|
2008-11-18 00:22:27 +01:00
|
|
|
*/
|
2008-11-13 02:02:56 +01:00
|
|
|
|
2008-11-18 00:22:27 +01:00
|
|
|
if (nbytes)
|
|
|
|
{
|
|
|
|
uart_datareceived(dev);
|
2008-09-24 17:42:13 +02:00
|
|
|
}
|
2018-08-26 16:49:08 +02:00
|
|
|
|
2020-10-29 05:53:41 +01:00
|
|
|
#if defined(CONFIG_TTY_SIGINT) || defined(CONFIG_TTY_SIGTSTP)
|
2018-09-02 23:36:25 +02:00
|
|
|
/* Send the signal if necessary */
|
2018-08-26 16:49:08 +02:00
|
|
|
|
2018-09-02 23:36:25 +02:00
|
|
|
if (signo != 0)
|
2018-08-26 16:49:08 +02:00
|
|
|
{
|
2020-05-02 16:30:58 +02:00
|
|
|
nxsig_kill(dev->pid, signo);
|
2018-08-26 16:49:08 +02:00
|
|
|
uart_reset_sem(dev);
|
|
|
|
}
|
|
|
|
#endif
|
2008-09-24 17:42:13 +02:00
|
|
|
}
|