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Using wiringPi instead bcm2835 #10

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243ac7c
Using wiringPi instead bcm2835
Xento Dec 15, 2014
dd9f2f6
fix read timming for negative temperatures
Xento Feb 4, 2015
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2 changes: 1 addition & 1 deletion binding.gyp
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Original file line number Diff line number Diff line change
Expand Up @@ -3,7 +3,7 @@
{
'target_name': 'node-dht-sensor',
'sources': [ 'node-dht-sensor.cpp' ],
'libraries': [ '-lbcm2835' ],
'libraries': [ '-lwiringPi' ],
'conditions': [
['OS=="linux"', {
'include_dirs+': '/usr/local/lib/libbcm2835.a',
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48 changes: 19 additions & 29 deletions node-dht-sensor.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -18,7 +18,7 @@
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <bcm2835.h>
#include <wiringPi.h>
#include <unistd.h>
#include <sched.h>

Expand Down Expand Up @@ -69,38 +69,39 @@ long readDHT(int type, int pin, float &temperature, float &humidity)
}

// Set GPIO pin to output
bcm2835_gpio_fsel(pin, BCM2835_GPIO_FSEL_OUTP);

bcm2835_gpio_write(pin, HIGH);
bcm2835_delay(400);
bcm2835_gpio_write(pin, LOW);
bcm2835_delay(20);

bcm2835_gpio_fsel(pin, BCM2835_GPIO_FSEL_INPT);
pinMode (pin, OUTPUT);

digitalWrite (pin, HIGH);
delay(500);

digitalWrite (pin, LOW);
delay(20);

pinMode (pin, INPUT) ;

data[0] = data[1] = data[2] = data[3] = data[4] = 0;

// wait for pin to drop?
int timeout = 100000;
while (bcm2835_gpio_lev(pin) == 1) {
while (digitalRead (pin) == 1) {
if (--timeout < 0) {
#ifdef VERBOSE
printf("Sensor timeout.\n");
#endif
return -3;
}
bcm2835_delayMicroseconds(1); //usleep(1);
usleep(1);
}

// read data!
for (int i = 0; i < MAXTIMINGS; i++) {
counter = 0;
while (bcm2835_gpio_lev(pin) == laststate) {
while (digitalRead (pin) == laststate) {
counter++;
if (counter == 1000)
break;
}
laststate = bcm2835_gpio_lev(pin);
laststate = digitalRead (pin);
if (counter == 1000) break;
#ifdef VERBOSE
if (bitidx < 1000) {
Expand Down Expand Up @@ -178,23 +179,12 @@ int initialize()
struct sched_param schedp;
schedp.sched_priority = 1;
sched_setscheduler(0, SCHED_FIFO, &schedp);

wiringPiSetup ();

if (!bcm2835_init())
{
#ifdef VERBOSE
printf("BCM2835 initialization failed.\n");
#endif
return 1;
}
else
{
#ifdef VERBOSE
printf("BCM2835 initialized.\n");
#endif
initialized = 1;
memset(last_read, 0, sizeof(unsigned long long)*32);
return 0;
}
initialized = 1;
memset(last_read, 0, sizeof(unsigned long long)*32);
return 0;
}

using namespace v8;
Expand Down