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examples/ads7046: Add new example for ADS7046 ADC
Add a new example that shows how to read a sample from an ADS7046 ADC sensor registered on the SPI bus. Signed-off-by: Niccolò Maggioni <nicco.maggioni+nuttx@gmail.com>
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‎examples/ads7046/CMakeLists.txt‎

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# ##############################################################################
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# apps/examples/ads7046/CMakeLists.txt
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#
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# SPDX-License-Identifier: Apache-2.0
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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_ADS7046)
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nuttx_add_application(
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NAME
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${CONFIG_EXAMPLES_ADS7046_PROGNAME}
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PRIORITY
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${CONFIG_EXAMPLES_ADS7046_PRIORITY}
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STACKSIZE
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${CONFIG_EXAMPLES_ADS7046_STACKSIZE}
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MODULE
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${CONFIG_EXAMPLES_ADS7046}
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SRCS
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ads7046_main.c)
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endif()

‎examples/ads7046/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_ADS7046
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tristate "ADS7046 ADC example"
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default n
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depends on ADC_ADS7046
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---help---
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Enable the ADS7046 example
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if EXAMPLES_ADS7046
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config EXAMPLES_ADS7046_PROGNAME
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string "Program name"
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default "ads7046"
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---help---
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This is the name of the program that will be used when the NSH ELF
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program is installed.
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config EXAMPLES_ADS7046_PRIORITY
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int "ADS7046 task priority"
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default 100
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config EXAMPLES_ADS7046_STACKSIZE
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int "ADS7046 stack size"
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default DEFAULT_TASK_STACKSIZE
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config EXAMPLES_ADS7046_DEVPATH
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string "ADS7046 device path"
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default "/dev/adc0"
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---help---
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The default path to the ADS7046 ADC device
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endif

‎examples/ads7046/Make.defs‎

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############################################################################
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# apps/examples/ads7046/Make.defs
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#
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# SPDX-License-Identifier: Apache-2.0
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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_ADS7046),)
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CONFIGURED_APPS += $(APPDIR)/examples/ads7046
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endif

‎examples/ads7046/Makefile‎

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############################################################################
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# apps/examples/ads7046/Makefile
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#
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# SPDX-License-Identifier: Apache-2.0
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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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# ADS7046 ADC example built-in application info
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PROGNAME = $(CONFIG_EXAMPLES_ADS7046_PROGNAME)
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PRIORITY = $(CONFIG_EXAMPLES_ADS7046_PRIORITY)
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STACKSIZE = $(CONFIG_EXAMPLES_ADS7046_STACKSIZE)
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MODULE = $(CONFIG_EXAMPLES_ADS7046)
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# ADS7046 ADC example
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MAINSRC = ads7046_main.c
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include $(APPDIR)/Application.mk

‎examples/ads7046/ads7046_main.c‎

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/****************************************************************************
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* apps/examples/ads7046/ads7046_main.c
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*
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* SPDX-License-Identifier: Apache-2.0
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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 <stdio.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <nuttx/analog/ioctl.h>
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#include <nuttx/analog/ads7046.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* As per the datasheet, the ADS7046 returns the following readings:
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* INPUT VOLTAGE (AINP - AINM) DESCRIPTION HEX
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* -------------------------------------- ------------------------ ---
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* <= 1 LSB Negative full-scale code 000
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* 1 LSB to 2 LSB - 001
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* V_REF / 2 to V_REF / 2 + 1 LSB Mid code 7FF
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* V_REF / 2 + 1 LSB to V_REF / 2 + 2 LSB - 800
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* >= V_REF - 1 LSB Positive full-scale code FFF
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*/
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#define SAMPLE_TO_PCT(sample) (((sample) * 100) / 0xfff)
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: ads7046_main
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****************************************************************************/
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int main(const int argc, FAR char *argv[])
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{
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UNUSED(argc);
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UNUSED(argv);
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int ret;
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int fd;
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uint16_t sample;
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fd = open(CONFIG_EXAMPLES_ADS7046_DEVPATH, O_RDONLY);
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if (fd < 0)
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{
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printf("Failed to open %s: %s (%d)\n", CONFIG_EXAMPLES_ADS7046_DEVPATH,
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strerror(errno), errno);
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return EXIT_FAILURE;
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}
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ret = ioctl(fd, ANIOC_ADS7046_READ, &sample);
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if (ret != OK)
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{
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perror("Could not ioctl fd");
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close(fd);
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return EXIT_FAILURE;
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}
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printf("ADS7046: hex=%x, dec=%"PRIu16", adc_percentage=%u%%\n",
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sample, sample, SAMPLE_TO_PCT(sample));
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close(fd);
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return EXIT_SUCCESS;
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}

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