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commit 8e3eca1836d7dabecb6e69ed11b8ac4c54cb56c0 Author: Sara Souza <[email protected]> AuthorDate: Wed Mar 10 15:25:34 2021 -0300 apps/examples: Adds termios example --- examples/README.md | 9 +++ examples/termios/Kconfig | 24 ++++++++ examples/termios/Make.defs | 23 ++++++++ examples/termios/Makefile | 34 +++++++++++ examples/termios/termios_main.c | 127 ++++++++++++++++++++++++++++++++++++++++ 5 files changed, 217 insertions(+) diff --git a/examples/README.md b/examples/README.md index 4449a99..6dd601d 100644 --- a/examples/README.md +++ b/examples/README.md @@ -1651,6 +1651,15 @@ character per TCP transfer): - `CONFIG_STDIO_BUFFER_SIZE` – Some value `>= 64` - `CONFIG_STDIO_LINEBUFFER=y` +## `termios` Simple Termios interface test + +This directory contains a simple application that uses the termios interface +to change serial parameters. Just import a `nsh` config and enable the +following symbols: + +- `CONFIG_SERIAL_TERMIOS` – Enable the termios support. +- `CONFIG_EXAMPLES_TERMIOS` – Enable the example itself. + ## `thttpd` THTTPD server An example that builds `netutils/thttpd` with some simple NXFLAT CGI programs. diff --git a/examples/termios/Kconfig b/examples/termios/Kconfig new file mode 100644 index 0000000..e322f70 --- /dev/null +++ b/examples/termios/Kconfig @@ -0,0 +1,24 @@ +# +# For a description of the syntax of this configuration file, +# see the file kconfig-language.txt in the NuttX tools repository. +# + +config EXAMPLES_TERMIOS + tristate "Termios example" + default n + ---help--- + Enable the Termios example. This example + shows how to change serial parameters like baud rate, + stop bits, data lenght and parity using the termios interface. + +if EXAMPLES_TERMIOS + +config EXAMPLES_TERMIOS_PRIORITY + int "Termios task priority" + default 100 + +config EXAMPLES_TERMIOS_STACKSIZE + int "Termios stack size" + default DEFAULT_TASK_STACKSIZE + +endif diff --git a/examples/termios/Make.defs b/examples/termios/Make.defs new file mode 100644 index 0000000..06ac9be --- /dev/null +++ b/examples/termios/Make.defs @@ -0,0 +1,23 @@ +############################################################################ +# apps/examples/termios/Make.defs +# +# Licensed to the Apache Software Foundation (ASF) under one or more +# contributor license agreements. See the NOTICE file distributed with +# this work for additional information regarding copyright ownership. The +# ASF licenses this file to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance with the +# License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT +# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the +# License for the specific language governing permissions and limitations +# under the License. +# +############################################################################ + +ifneq ($(CONFIG_EXAMPLES_TERMIOS),) +CONFIGURED_APPS += $(APPDIR)/examples/termios +endif diff --git a/examples/termios/Makefile b/examples/termios/Makefile new file mode 100644 index 0000000..9c038ac --- /dev/null +++ b/examples/termios/Makefile @@ -0,0 +1,34 @@ +############################################################################ +# examples/termios/Make.defs +# +# Licensed to the Apache Software Foundation (ASF) under one or more +# contributor license agreements. See the NOTICE file distributed with +# this work for additional information regarding copyright ownership. The +# ASF licenses this file to you under the Apache License, Version 2.0 (the +# "License"); you may not use this file except in compliance with the +# License. You may obtain a copy of the License at +# +# http://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT +# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the +# License for the specific language governing permissions and limitations +# under the License. +# +############################################################################ + +include $(APPDIR)/Make.defs + +# Termios Example! built-in application info + +PROGNAME = termios +PRIORITY = $(CONFIG_EXAMPLES_TERMIOS_PRIORITY) +STACKSIZE = $(CONFIG_EXAMPLES_TERMIOS_STACKSIZE) +MODULE = $(CONFIG_EXAMPLES_TERMIOS) + +# Termios Example + +MAINSRC = termios_main.c + +include $(APPDIR)/Application.mk diff --git a/examples/termios/termios_main.c b/examples/termios/termios_main.c new file mode 100644 index 0000000..7af7689 --- /dev/null +++ b/examples/termios/termios_main.c @@ -0,0 +1,127 @@ +/**************************************************************************** + * apps/examples/termios/termios_main.c + * + * Licensed to the Apache Software Foundation (ASF) under one or more + * contributor license agreements. See the NOTICE file distributed with + * this work for additional information regarding copyright ownership. The + * ASF licenses this file to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance with the + * License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the + * License for the specific language governing permissions and limitations + * under the License. + * + ****************************************************************************/ + +/**************************************************************************** + * Included Files + ****************************************************************************/ + +#include <nuttx/config.h> +#include <stdio.h> +#include <fcntl.h> +#include <unistd.h> +#include <termios.h> + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * main + ****************************************************************************/ + +void main(int argc, FAR char *argv[]) +{ + int fd; + int ret; + int error = OK; + struct termios tio; + + printf("Termios example\n"); + + fd = open("/dev/ttyS0", O_RDONLY); + if (fd < 0) + { + error = errno; + printf("Error opening serial: %d\n", error); + } + + /* Fill the termios struct with the current values. */ + + ret = tcgetattr(fd, &tio); + if (ret < 0) + { + error = errno; + printf("Error getting attributes: %d\n", error); + } + + /* Configure a baud rate. + * NuttX doesn't support different baud rates for RX and TX. + * So, both cfisetospeed() and cfisetispeed() are overwritten + * by cfsetspeed. + */ + + ret = cfsetspeed(&tio, B57600); + if (ret < 0) + { + error = errno; + printf("Error setting baud rate: %d\n", error); + } + + /* Configure 2 stop bits. */ + + tio.c_cflag |= CSTOPB; + + /* Enable parity and configure odd parity. */ + + tio.c_cflag |= PARENB | PARODD; + + /* Change the data size to 7 bits */ + + tio.c_cflag &= ~CSIZE; /* Clean the bits */ + tio.c_cflag |= CS7; /* 7 bits */ + + printf("Please, reopen the terminal with the new attributes," + " otherwise you will have garbage.\n" + "You may try: picocom /dev/ttyUSB0 --baud 57600" + " --parity o --databits 5 --stopbits 2\n\n"); + fflush(stdout); /* Clean stdout buffer */ + + /* Wait to empty the hardware buffer, otherwise the above message + * will not be seen because the following command will take effect + * before the hardware buffer gets empty. A small delay is enough. + */ + + usleep(100); + + /* Change the attributes now. */ + + ret = tcsetattr(fd, TCSANOW, &tio); + if (ret < 0) + { + error = errno; + /* Print the error code in the loop because at this + * moment the serial attributes already changed + */ + } + + (void)close(fd); + + /* Now, we should reopen the terminal with the new + * attributes to see if they took effect; + */ + + while (1) + { + printf("If you can read this message, the changes took effect.\n" + "Expected error code: 0. Current code: %d\n", error); + sleep(1); + } +} +
