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Merge pull request #1764 from alignan/pull/zoul-dht22

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Added DHT22 sensor to Zoul-based platforms
This commit is contained in:
Antonio Lignan 2016-07-15 12:50:34 -05:00 committed by GitHub
parent d36c8762c1 d5e2a779d4
commit 0d0e726b38
4 changed files with 459 additions and 1 deletions
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3
examples/zolertia/zoul/Makefile
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@ -5,11 +5,12 @@ CONTIKI_PROJECT += test-bmp085-bmp180 test-motion test-rotation-sensor
CONTIKI_PROJECT += test-grove-light-sensor test-grove-loudness-sensor
CONTIKI_PROJECT += test-weather-meter test-grove-gyro test-lcd test-iaq
CONTIKI_PROJECT += test-pm10-sensor test-vac-sensor test-aac-sensor
CONTIKI_PROJECT += test-zonik
CONTIKI_PROJECT += test-zonik test-dht22.c
CONTIKI_TARGET_SOURCEFILES += tsl2563.c sht25.c bmpx8x.c motion-sensor.c
CONTIKI_TARGET_SOURCEFILES += adc-sensors.c weather-meter.c grove-gyro.c
CONTIKI_TARGET_SOURCEFILES += rgb-bl-lcd.c pm10-sensor.c iaq.c zonik.c relay.c
CONTIKI_TARGET_SOURCEFILES += dht22.c
all: $(CONTIKI_PROJECT)

88
examples/zolertia/zoul/test-dht22.c Normal file
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/*
* Copyright (c) 2016, Zolertia <http://www.zolertia.com>
* 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 of the Institute 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 INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*
*/
/**
* \addtogroup zoul-examples
* @{
*
* \defgroup zoul-dht22-test DHT22 temperature and humidity sensor test
*
* Demonstrates the use of the DHT22 digital temperature and humidity sensor
* @{
*
* \file
* A quick program for testing the DHT22 temperature and humidity sensor
* \author
* Antonio Lignan <alinan@zolertia.com>
*/
/*---------------------------------------------------------------------------*/
#include <stdio.h>
#include "contiki.h"
#include "dev/dht22.h"
/*---------------------------------------------------------------------------*/
PROCESS(remote_dht22_process, "DHT22 test");
AUTOSTART_PROCESSES(&remote_dht22_process);
/*---------------------------------------------------------------------------*/
static struct etimer et;
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(remote_dht22_process, ev, data)
{
int16_t temperature, humidity;
PROCESS_BEGIN();
SENSORS_ACTIVATE(dht22);
/* Let it spin and read sensor data */
while(1) {
etimer_set(&et, CLOCK_SECOND);
PROCESS_WAIT_EVENT_UNTIL(etimer_expired(&et));
/* The standard sensor API may be used to read sensors individually, using
* the `dht22.value(DHT22_READ_TEMP)` and `dht22.value(DHT22_READ_HUM)`,
* however a single read operation (5ms) returns both values, so by using
* the function below we save one extra operation
*/
if(dht22_read_all(&temperature, &humidity) != DHT22_ERROR) {
printf("Temperature %02d.%02d ºC, ", temperature / 10, temperature % 10);
printf("Humidity %02d.%02d RH\n", humidity / 10, humidity % 10);
} else {
printf("Failed to read the sensor\n");
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
/**
* @}
* @}
*/

255
platform/zoul/dev/dht22.c Normal file
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@ -0,0 +1,255 @@
/*
* Copyright (c) 2016, Zolertia - http://www.zolertia.com
* 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 of the Institute 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 INSTITUTE 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 INSTITUTE 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.
*
*/
/*---------------------------------------------------------------------------*/
/**
* \addtogroup zoul-dht22
* @{
*
* \file
* Driver for the DHT22 temperature and humidity sensor
*/
/*---------------------------------------------------------------------------*/
#include "contiki.h"
#include "dht22.h"
#include "dev/gpio.h"
#include "lib/sensors.h"
#include "dev/ioc.h"
#include "dev/watchdog.h"
#include <stdio.h>
/*---------------------------------------------------------------------------*/
#define DEBUG 0
#if DEBUG
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
#define BUSYWAIT_UNTIL(max_time) \
do { \
rtimer_clock_t t0; \
t0 = RTIMER_NOW(); \
while(RTIMER_CLOCK_LT(RTIMER_NOW(), t0 + (max_time))) { \
watchdog_periodic(); \
} \
} while(0)
/*---------------------------------------------------------------------------*/
#define DHT22_PORT_BASE GPIO_PORT_TO_BASE(DHT22_PORT)
#define DHT22_PIN_MASK GPIO_PIN_MASK(DHT22_PIN)
/*---------------------------------------------------------------------------*/
static uint8_t enabled;
static uint8_t busy;
static uint8_t dht22_data[DHT22_BUFFER];
/*---------------------------------------------------------------------------*/
static int
dht22_read(void)
{
uint8_t i;
uint8_t j = 0;
uint8_t last_state;
uint8_t counter = 0;
uint8_t checksum = 0;
if(enabled) {
/* Exit low power mode and initialize variables */
GPIO_SET_OUTPUT(DHT22_PORT_BASE, DHT22_PIN_MASK);
GPIO_SET_PIN(DHT22_PORT_BASE, DHT22_PIN_MASK);
BUSYWAIT_UNTIL(DHT22_AWAKE_TIME);
memset(dht22_data, 0, DHT22_BUFFER);
/* Initialization sequence */
GPIO_CLR_PIN(DHT22_PORT_BASE, DHT22_PIN_MASK);
BUSYWAIT_UNTIL(DHT22_START_TIME);
GPIO_SET_PIN(DHT22_PORT_BASE, DHT22_PIN_MASK);
clock_delay_usec(DHT22_READY_TIME);
/* Prepare to read, DHT22 should keep line low 80us, then 80us high.
* The ready-to-send-bit condition is the line kept low for 50us, then if
* the line is high between 24-25us the bit sent will be "0" (zero), else
* if the line is high between 70-74us the bit sent will be "1" (one).
*/
GPIO_SET_INPUT(DHT22_PORT_BASE, DHT22_PIN_MASK);
last_state = GPIO_READ_PIN(DHT22_PORT_BASE, DHT22_PIN_MASK);
for(i = 0; i < DHT22_MAX_TIMMING; i++) {
counter = 0;
while(GPIO_READ_PIN(DHT22_PORT_BASE, DHT22_PIN_MASK) == last_state) {
counter++;
clock_delay_usec(DHT22_READING_DELAY);
/* Exit if not responsive */
if(counter == 0xFF) {
break;
}
}
last_state = GPIO_READ_PIN(DHT22_PORT_BASE, DHT22_PIN_MASK);
/* Double check for stray sensor */
if(counter == 0xFF) {
break;
}
/* Ignore the first 3 transitions (the 80us x 2 start condition plus the
* first ready-to-send-bit state), and discard ready-to-send-bit counts
*/
if((i >= 4) && ((i % 2) == 0)) {
dht22_data[j / 8] <<= 1;
if(counter > DHT22_COUNT) {
dht22_data[j / 8] |= 1;
}
j++;
}
}
for(i = 0; i < DHT22_BUFFER; i++) {
PRINTF("DHT22: (%u) %u\n", i, dht22_data[i]);
}
/* If we have 5 bytes (40 bits), wrap-up and end */
if(j >= 40) {
/* The first 2 bytes are humidity values, the next 2 are temperature, the
* final byte is the checksum
*/
checksum = dht22_data[0] + dht22_data[1] + dht22_data[2] + dht22_data[3];
checksum &= 0xFF;
if(dht22_data[4] == checksum) {
GPIO_SET_INPUT(DHT22_PORT_BASE, DHT22_PIN_MASK);
GPIO_SET_PIN(DHT22_PORT_BASE, DHT22_PIN_MASK);
return DHT22_SUCCESS;
}
PRINTF("DHT22: bad checksum\n");
}
}
return DHT22_ERROR;
}
/*---------------------------------------------------------------------------*/
static uint16_t
dht22_humidity(void)
{
uint16_t res;
res = dht22_data[0];
res *= 256;
res += dht22_data[1];
busy = 0;
return res;
}
/*---------------------------------------------------------------------------*/
static uint16_t
dht22_temperature(void)
{
uint16_t res;
res = dht22_data[2] & 0x7F;
res *= 256;
res += dht22_data[3];
busy = 0;
return res;
}
/*---------------------------------------------------------------------------*/
static int
value(int type)
{
if((type != DHT22_READ_HUM) && (type != DHT22_READ_TEMP) &&
(type != DHT22_READ_ALL)) {
PRINTF("DHT22: Invalid type %u\n", type);
return DHT22_ERROR;
}
if(busy) {
PRINTF("DHT22: ongoing operation, wait\n");
return DHT22_BUSY;
}
busy = 1;
if(dht22_read() != DHT22_SUCCESS) {
PRINTF("DHT22: Fail to read sensor\n");
GPIO_SET_INPUT(DHT22_PORT_BASE, DHT22_PIN_MASK);
GPIO_SET_PIN(DHT22_PORT_BASE, DHT22_PIN_MASK);
busy = 0;
return DHT22_ERROR;
}
switch(type) {
case DHT22_READ_HUM:
return dht22_humidity();
case DHT22_READ_TEMP:
return dht22_temperature();
case DHT22_READ_ALL:
return DHT22_SUCCESS;
default:
return DHT22_ERROR;
}
}
/*---------------------------------------------------------------------------*/
int
dht22_read_all(int *temperature, int *humidity)
{
if((temperature == NULL) || (humidity == NULL)) {
PRINTF("DHT22: Invalid arguments\n");
return DHT22_ERROR;
}
if(value(DHT22_READ_ALL) != DHT22_ERROR) {
*temperature = dht22_temperature();
*humidity = dht22_humidity();
return DHT22_SUCCESS;
}
/* Already cleaned-up in the value() function */
return DHT22_ERROR;
}
/*---------------------------------------------------------------------------*/
static int
configure(int type, int value)
{
if(type != SENSORS_ACTIVE) {
return DHT22_ERROR;
}
GPIO_SOFTWARE_CONTROL(DHT22_PORT_BASE, DHT22_PIN_MASK);
GPIO_SET_INPUT(DHT22_PORT_BASE, DHT22_PIN_MASK);
ioc_set_over(DHT22_PORT, DHT22_PIN, IOC_OVERRIDE_OE);
GPIO_SET_PIN(DHT22_PORT_BASE, DHT22_PIN_MASK);
/* Restart flag */
busy = 0;
if(value) {
enabled = 1;
return DHT22_SUCCESS;
}
enabled = 0;
return DHT22_SUCCESS;
}
/*---------------------------------------------------------------------------*/
SENSORS_SENSOR(dht22, DHT22_SENSOR, value, configure, NULL);
/*---------------------------------------------------------------------------*/
/** @} */

114
platform/zoul/dev/dht22.h Normal file
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@ -0,0 +1,114 @@
/*
* Copyright (c) 2016, Zolertia - http://www.zolertia.com
* 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 of the Institute 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 INSTITUTE 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 INSTITUTE 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.
*
* This file is part of the Contiki operating system.
*
*/
/*---------------------------------------------------------------------------*/
/**
* \addtogroup zoul-sensors
* @{
*
* \defgroup zoul-dht22 DHT22 temperature and humidity sensor
*
* Driver for the DHT22 temperature and humidity sensor
* @{
*
* \file
* Header file for the DHT22 temperature and humidity sensor
*/
/*---------------------------------------------------------------------------*/
#include "lib/sensors.h"
/*---------------------------------------------------------------------------*/
#ifndef DHT22_H_
#define DHT22_H_
/* -------------------------------------------------------------------------- */
/**
* \name DHT22 default pin and port
* @{
*/
#ifdef DHT22_CONF_PIN
#define DHT22_PIN DHT22_CONF_PIN
#else
#define DHT22_PIN 5
#endif
#ifdef DHT22_CONF_PORT
#define DHT22_PORT DHT22_CONF_PORT
#else
#define DHT22_PORT GPIO_A_NUM
#endif
/** @} */
/* -------------------------------------------------------------------------- */
/**
* \name DHT22 available commands
* @{
*/
#define DHT22_READ_TEMP 0x01
#define DHT22_READ_HUM 0x02
#define DHT22_READ_ALL 0x03
/** @} */
/* -------------------------------------------------------------------------- */
/**
* \name DHT22 return types
* @{
*/
#define DHT22_ERROR (-1)
#define DHT22_SUCCESS 0x00
#define DHT22_BUSY 0xFF
/** @} */
/* -------------------------------------------------------------------------- */
/**
* \name DHT22 constants
* @{
*/
#define DHT22_BUFFER 5 /**< Buffer to store the samples */
#define DHT22_COUNT 8 /**< Minimum ticks to detect a "1" bit */
#define DHT22_MAX_TIMMING 85 /**< Maximum ticks in a single operation */
#define DHT22_READING_DELAY 1 /**< 1 us */
#define DHT22_READY_TIME 20 /**< 40 us */
#define DHT22_START_TIME (RTIMER_SECOND / 50) /**< 20 ms */
#define DHT22_AWAKE_TIME (RTIMER_SECOND / 4) /**< 250 ms */
/** @} */
/* -------------------------------------------------------------------------- */
/**
* \name DHT22 auxiliary functions
* @{
*/
int dht22_read_all(int *temperature, int *humidity);
/** @} */
/* -------------------------------------------------------------------------- */
#define DHT22_SENSOR "DHT22 sensor"
/* -------------------------------------------------------------------------- */
extern const struct sensors_sensor dht22;
/* -------------------------------------------------------------------------- */
#endif /* DHT22_H_ */
/* -------------------------------------------------------------------------- */
/**
* @}
* @}
*/