navio_adc: add driver for Navio2 ADC

Signed-off-by: Nicolae Rosia <nicolae.rosia@gmail.com>

cmake/configs/posix_rpi_common.cmake

@@ -72,6 +72,7 @@ set(config_module_list
 	# PX4 drivers
 	#
 	drivers/gps
+	drivers/navio_adc
 	drivers/navio_sysfs_rc_in
 	drivers/navio_sysfs_pwm_out
 	drivers/navio_gpio

posix-configs/rpi/px4.config

@@ -10,6 +10,7 @@ df_lsm9ds1_wrapper start -R 4
 #df_hmc5883_wrapper start
 df_ms5611_wrapper start
 navio_rgbled start
+navio_adc start
 gps start -d /dev/spidev0.0 -i spi -p ubx
 sensors start
 commander start

posix-configs/rpi/px4_fw.config

@@ -8,6 +8,7 @@ dataman start
 df_lsm9ds1_wrapper start -R 4
 df_ms5611_wrapper start
 navio_rgbled start
+navio_adc start
 gps start -d /dev/spidev0.0 -i spi -p ubx
 sensors start
 commander start

src/drivers/navio_adc/CMakeLists.txt

@@ -0,0 +1,42 @@
+############################################################################
+#
+#   Copyright (c) 2015-2017 PX4 Development Team. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+#
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in
+#    the documentation and/or other materials provided with the
+#    distribution.
+# 3. Neither the name PX4 nor the names of its contributors may be
+#    used to endorse or promote products derived from this software
+#    without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+# OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+#
+############################################################################
+px4_add_module(
+	MODULE drivers__navio_adc
+	MAIN navio_adc
+	COMPILE_FLAGS
+	SRCS
+		navio_adc.cpp
+	DEPENDS
+		platforms__common
+	)
+# vim: set noet ft=cmake fenc=utf-8 ff=unix :

src/drivers/navio_adc/navio_adc.cpp

@@ -0,0 +1,283 @@
+/****************************************************************************
+ *
+ *   Copyright (c) 2012-2017 PX4 Development Team. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ * 3. Neither the name PX4 nor the names of its contributors may be
+ *    used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ *
+ ****************************************************************************/
+
+/**
+ * @file navio_adc.cpp
+ *
+ * Navio2 ADC Driver
+ *
+ * This driver exports the sysfs-based ADC driver on Navio2.
+ *
+ * @author Nicolae Rosia <nicolae.rosia@gmail.com>
+ */
+
+#include <px4_config.h>
+#include <px4_tasks.h>
+#include <px4_posix.h>
+#include <px4_adc.h>
+#include <drivers/drv_adc.h>
+
+#include <VirtDevObj.hpp>
+
+#include <unistd.h>
+#include <stdio.h>
+#include <poll.h>
+#include <string.h>
+
+#define ADC_BASE_DEV_PATH "/dev/adc"
+#define ADC_SYSFS_PATH "/sys/kernel/rcio/adc/ch0"
+#define ADC_MAX_CHAN 6
+
+/*
+ * ADC Channels:
+ * A0 - Board voltage (5V)
+ * A1 - servo rail voltage
+ * A2 - power module voltage (ADC0, POWER port)
+ * A3 - power module current (ADC1, POWER port)
+ * A4 - ADC2 (ADC port)
+ * A5 - ADC3 (ADC port)
+ */
+
+#define NAVIO_ADC_BATTERY_VOLTAGE_CHANNEL (2)
+#define NAVIO_ADC_BATTERY_CURRENT_CHANNEL (3)
+
+__BEGIN_DECLS
+__EXPORT int navio_adc_main(int argc, char *argv[]);
+__END_DECLS
+
+class NavioADC: public DriverFramework::VirtDevObj
+{
+public:
+	NavioADC();
+	virtual ~NavioADC();
+
+	virtual int init();
+
+	virtual ssize_t devRead(void *buf, size_t count) override;
+	virtual int devIOCTL(unsigned long request, unsigned long arg) override;
+
+protected:
+	virtual void _measure() override;
+
+private:
+	int read_channel(struct adc_msg_s *adc_msg, int channel);
+
+	pthread_mutex_t _samples_lock;
+	adc_msg_s _samples[ADC_MAX_CHAN];
+};
+
+NavioADC::NavioADC()
+	: DriverFramework::VirtDevObj("navio_adc", ADC0_DEVICE_PATH, ADC_BASE_DEV_PATH, 1e6 / 100)
+{
+	pthread_mutex_init(&_samples_lock, NULL);
+}
+
+NavioADC::~NavioADC()
+{
+	pthread_mutex_destroy(&_samples_lock);
+}
+
+void NavioADC::_measure()
+{
+	adc_msg_s tmp_samples[ADC_MAX_CHAN];
+
+	for (int i = 0; i < ADC_MAX_CHAN; ++i) {
+		int ret = read_channel(&tmp_samples[i], i);
+		if (ret != 0) {
+			PX4_ERR("read_channel(%d): %d", i, ret);
+			tmp_samples[i].am_channel = i;
+			tmp_samples[i].am_data = 0;
+		}
+	}
+
+	tmp_samples[NAVIO_ADC_BATTERY_VOLTAGE_CHANNEL].am_channel = ADC_BATTERY_VOLTAGE_CHANNEL;
+	tmp_samples[NAVIO_ADC_BATTERY_CURRENT_CHANNEL].am_channel = ADC_BATTERY_CURRENT_CHANNEL;
+
+	pthread_mutex_lock(&_samples_lock);
+	memcpy(&_samples, &tmp_samples, sizeof(tmp_samples));
+	pthread_mutex_unlock(&_samples_lock);
+}
+
+int NavioADC::init()
+{
+	int ret;
+
+	ret = DriverFramework::VirtDevObj::init();
+
+	if (ret != PX4_OK) {
+		PX4_ERR("init failed");
+		return ret;
+	}
+
+	return PX4_OK;
+}
+
+int NavioADC::devIOCTL(unsigned long request, unsigned long arg)
+{
+	return -ENOTTY;
+}
+
+ssize_t NavioADC::devRead(void *buf, size_t count)
+{
+	const size_t maxsize = sizeof(_samples);
+	int ret;
+
+	if (count > maxsize)
+		count = maxsize;
+
+	ret = pthread_mutex_trylock(&_samples_lock);
+	if (ret != 0)
+		return 0;
+
+	memcpy(buf, &_samples, count);
+	pthread_mutex_unlock(&_samples_lock);
+
+	return count;
+}
+
+int NavioADC::read_channel(struct adc_msg_s *adc_msg, int channel)
+{
+	char buffer[11]; /* 32bit max INT has maximum 10 chars */
+	char channel_path[sizeof(ADC_SYSFS_PATH)];
+	int fd;
+	int ret;
+
+	if (channel < 0 || channel > 5) {
+		return -EINVAL;
+	}
+
+	strncpy(channel_path, ADC_SYSFS_PATH, sizeof(ADC_SYSFS_PATH));
+	channel_path[sizeof(ADC_SYSFS_PATH) - 2] += channel;
+
+	fd = ::open(channel_path, O_RDONLY);
+	if (fd == -1) {
+		ret = errno;
+		PX4_ERR("read_channel: open: %s (%d)", strerror(ret), ret);
+		return ret;
+	}
+
+	ret = ::read(fd, buffer, sizeof(buffer) - 1);
+	if (ret == -1) {
+		ret = errno;
+		PX4_ERR("read_channel: read: %s (%d)", strerror(ret), ret);
+		goto cleanup;
+	} else if (ret == 0) {
+		PX4_ERR("read_channel: read empty");
+		ret = -EINVAL;
+		goto cleanup;
+	}
+
+	buffer[ret] = 0;
+
+	adc_msg->am_channel = channel;
+	adc_msg->am_data = strtol(buffer, NULL, 10);
+	ret = 0;
+
+cleanup:
+	::close(fd);
+
+	return ret;
+}
+
+static NavioADC *instance = nullptr;
+
+int navio_adc_main(int argc, char *argv[])
+{
+	int ret;
+
+	if (argc < 2) {
+		PX4_WARN("usage: <start/stop>");
+		return PX4_ERROR;
+	}
+
+	if (!strcmp(argv[1], "start")) {
+		if (instance) {
+			PX4_WARN("already started");
+			return PX4_OK;
+		}
+
+		instance = new NavioADC;
+		if (!instance) {
+			PX4_WARN("not enough memory");
+			return PX4_ERROR;
+		}
+
+		if (instance->init() != PX4_OK) {
+			delete instance;
+			instance = nullptr;
+			PX4_WARN("init failed");
+			return PX4_ERROR;
+		}
+
+		return PX4_OK;
+	} else if (!strcmp(argv[1], "stop")) {
+		if (!instance) {
+			PX4_WARN("already stopped");
+			return PX4_OK;
+		}
+
+		delete instance;
+		instance = nullptr;
+		return PX4_OK;
+	} else if (!strcmp(argv[1], "test")) {
+		if (!instance) {
+			PX4_ERR("start first");
+			return PX4_ERROR;
+		}
+
+		struct adc_msg_s adc_msgs[ADC_MAX_CHAN];
+
+		ret = instance->devRead((char*)&adc_msgs, sizeof(adc_msgs));
+		if (ret < 0) {
+			PX4_ERR("ret: %s (%d)\n", strerror(ret), ret);
+			return ret;
+		} else if (ret != sizeof(adc_msgs)) {
+			PX4_ERR("incomplete read: %d expected %d", ret, sizeof(adc_msgs));
+			return ret;
+		}
+
+		for (int i = 0; i < ADC_MAX_CHAN; ++i) {
+			PX4_INFO("chan: %d; value: %d", (int)adc_msgs[i].am_channel,
+					 adc_msgs[i].am_data);
+		}
+
+		return PX4_OK;
+	} else {
+		PX4_WARN("action (%s) not supported", argv[1]);
+
+		return PX4_ERROR;
+	}
+
+	return PX4_OK;
+
+}

src/modules/sensors/sensors.cpp

@@ -554,7 +554,7 @@ Sensors::task_main()
 	int ret = 0;
 
 	if (!_hil_enabled) {
-#if !defined(__PX4_QURT) && !defined(__PX4_POSIX_RPI) && !defined(__PX4_POSIX_BEBOP)
+#if !defined(__PX4_QURT) && !defined(__PX4_POSIX_BEBOP)
 		adc_init();
 #endif
 	}