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examples/rmtchar: Implement RX and/or TX using the RMT char driver
The RMT (remote control) character driver is used to send and/or receive data packets. Eventually, this app can be used to perform a loopback test to validate the RMT driver implementation.
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‎examples/rmtchar/CMakeLists.txt

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# ##############################################################################
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# apps/examples/rmtchar/CMakeLists.txt
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#
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# Licensed to the Apache Software Foundation (ASF) under one or more contributor
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# license agreements. See the NOTICE file distributed with this work for
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# additional information regarding copyright ownership. The ASF licenses this
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# file to you under the Apache License, Version 2.0 (the "License"); you may not
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# use this file except in compliance with the License. You may obtain a copy of
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# the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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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 under
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# the License.
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#
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# ##############################################################################
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if(CONFIG_EXAMPLES_RMTCHAR)
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nuttx_add_application(
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NAME
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rmtchar
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STACKSIZE
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${CONFIG_DEFAULT_TASK_STACKSIZE}
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MODULE
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${CONFIG_EXAMPLES_RMTCHAR}
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SRCS
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rmtchar_common.c
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rmtchar_main.c)
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if(CONFIG_EXAMPLES_RMTCHAR_TX)
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target_sources(apps PRIVATE rmtchar_transmitter.c)
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endif()
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if(CONFIG_EXAMPLES_RMTCHAR_RX)
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target_sources(apps PRIVATE rmtchar_receiver.c)
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endif()
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endif()

‎examples/rmtchar/Kconfig

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#
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# For a description of the syntax of this configuration file,
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# see the file kconfig-language.txt in the NuttX tools repository.
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#
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config EXAMPLES_RMTCHAR
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tristate "RMT character driver test"
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default n
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depends on RMT
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---help---
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Enable the RMT character driver test
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if EXAMPLES_RMTCHAR
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config EXAMPLES_RMTCHAR_TX
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bool "Use RMT transmitter"
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default n
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---help---
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This should be set if the RMT device supports a transmitter.
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if EXAMPLES_RMTCHAR_TX
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config EXAMPLES_RMTCHAR_TX_DEVPATH
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string "RMT transmitter character device path"
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default "/dev/rmt0"
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---help---
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The default path to the RMT transmitter character device.
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Default: /dev/rmt0
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config EXAMPLES_RMTCHAR_TXSTACKSIZE
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int "Transmitter thread stack size"
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default DEFAULT_TASK_STACKSIZE
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---help---
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This is the stack size to use when starting the transmitter thread.
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endif # EXAMPLES_RMTCHAR_TX
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config EXAMPLES_RMTCHAR_RX
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bool "Use RMT receiver"
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default n
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---help---
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This should be set if the RMT device supports a receiver.
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if EXAMPLES_RMTCHAR_RX
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config EXAMPLES_RMTCHAR_RX_DEVPATH
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string "RMT receiver character device path"
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default "/dev/rmt1"
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---help---
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The default path to the RMT receiver character device.
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Default: /dev/rmt1
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config EXAMPLES_RMTCHAR_RXSTACKSIZE
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int "Receiver thread stack size"
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default DEFAULT_TASK_STACKSIZE
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---help---
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This is the stack size to use when starting the receiver thread.
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endif # EXAMPLES_RMTCHAR_RX
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config EXAMPLES_RMTCHAR_ITEMS
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int "Number of words to transmit or receive"
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default 64
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---help---
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This is the total amount of words to be transmitted or
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received by the RMT RX device.
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endif

‎examples/rmtchar/Make.defs

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############################################################################
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# apps/examples/rmtchar/Make.defs
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#
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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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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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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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#
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############################################################################
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ifneq ($(CONFIG_EXAMPLES_RMTCHAR),)
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CONFIGURED_APPS += $(APPDIR)/examples/rmtchar
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endif

‎examples/rmtchar/Makefile

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############################################################################
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# apps/examples/rmtchar/Makefile
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#
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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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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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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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#
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############################################################################
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include $(APPDIR)/Make.defs
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# rmt character driver test
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ifeq ($(CONFIG_EXAMPLES_RMTCHAR_TX),y)
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CSRCS += rmtchar_transmitter.c
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endif
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ifeq ($(CONFIG_EXAMPLES_RMTCHAR_RX),y)
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CSRCS += rmtchar_receiver.c
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endif
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CSRCS += rmtchar_common.c
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MAINSRC = rmtchar_main.c
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# Touchscreen built-in application info
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PROGNAME = rmtchar
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PRIORITY = SCHED_PRIORITY_DEFAULT
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STACKSIZE = $(CONFIG_DEFAULT_TASK_STACKSIZE)
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MODULE = $(CONFIG_EXAMPLES_RMTCHAR)
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include $(APPDIR)/Application.mk

‎examples/rmtchar/rmtchar.h

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/****************************************************************************
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* apps/examples/rmtchar/rmtchar.h
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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*
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****************************************************************************/
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#ifndef __APPS_EXAMPLES_RMTCHAR_RMTCHAR_H
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#define __APPS_EXAMPLES_RMTCHAR_RMTCHAR_H
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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 <pthread.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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#ifndef CONFIG_EXAMPLES_RMTCHAR_TX_DEVPATH
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# define CONFIG_EXAMPLES_RMTCHAR_TX_DEVPATH "/dev/rmt0"
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#endif
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#ifndef CONFIG_EXAMPLES_RMTCHAR_RX_DEVPATH
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# define CONFIG_EXAMPLES_RMTCHAR_RX_DEVPATH "/dev/rmt1"
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#endif
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/****************************************************************************
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* Public Types
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****************************************************************************/
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struct rmtchar_state_s
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{
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bool initialized;
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int rmtchar_items;
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#ifdef CONFIG_EXAMPLES_RMTCHAR_TX
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FAR char *txdevpath;
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#endif
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#ifdef CONFIG_EXAMPLES_RMTCHAR_RX
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FAR char *rxdevpath;
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#endif
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};
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struct rmt_item32_s
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{
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union
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{
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struct
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{
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uint32_t duration0 : 15; /* Duration of level0 */
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uint32_t level0 : 1; /* Level of the first part */
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uint32_t duration1 : 15; /* Duration of level1 */
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uint32_t level1 : 1; /* Level of the second part */
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};
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uint32_t val; /* Equivalent unsigned value for the RMT item */
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};
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};
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/****************************************************************************
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* Public Data
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****************************************************************************/
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/****************************************************************************
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* Name: rmtchar_transmitter()
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*
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* Description:
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* This is the entry point for the transmitter thread.
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*
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****************************************************************************/
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#ifdef CONFIG_EXAMPLES_RMTCHAR_TX
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pthread_addr_t rmtchar_transmitter(pthread_addr_t arg);
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#endif
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/****************************************************************************
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* Name: rmtchar_receiver()
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*
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* Description:
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* This is the entry point for the receiver thread.
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*
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****************************************************************************/
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#ifdef CONFIG_EXAMPLES_RMTCHAR_RX
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pthread_addr_t rmtchar_receiver(pthread_addr_t arg);
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#endif
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/****************************************************************************
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* Name: print_items
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*
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* Description:
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* This function prints the level and duration of RMT items stored in a
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* buffer. It iterates over the buffer, printing the level and duration of
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* each item in a formatted manner.
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*
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* Input Parameters:
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* buf - Pointer to the buffer containing the RMT items.
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* len - The number of RMT items in the buffer.
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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void print_items(struct rmt_item32_s *buf, int len);
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#endif /* __APPS_EXAMPLES_RMTCHAR_RMTCHAR_H */

‎examples/rmtchar/rmtchar_common.c

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/****************************************************************************
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* apps/examples/rmtchar/rmtchar_common.c
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*
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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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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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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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*
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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 <sys/types.h>
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#include <stdio.h>
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#include <fcntl.h>
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#include <pthread.h>
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#include <errno.h>
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#include <debug.h>
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#include <unistd.h>
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#include "rmtchar.h"
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/****************************************************************************
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* Pre-processor Definitions
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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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* Private Data
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****************************************************************************/
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/****************************************************************************
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* Public Data
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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: print_items
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*
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* Description:
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* This function prints the level and duration of RMT items stored in a
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* buffer. It iterates over the buffer, printing the level and duration of
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* each item in a formatted manner.
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*
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* Input Parameters:
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* buf - Pointer to the buffer containing the RMT items.
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* len - The number of RMT items in the buffer.
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*
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* Returned Value:
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* None.
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*
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****************************************************************************/
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void print_items(struct rmt_item32_s *buf, int len)
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{
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int i;
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for (i = 0; i < len; i++, buf++)
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{
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printf("\t[%d]:\tL %d\tD %d\t", i, buf->level0, buf->duration0);
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printf("L %d\t D %d\n", buf->level1, buf->duration1);
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}
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}

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