Skip to content
GitLab
Menu
Projects
Groups
Snippets
Loading...
Help
Help
Support
Community forum
Keyboard shortcuts
?
Submit feedback
Contribute to GitLab
Sign in / Register
Toggle navigation
Menu
Open sidebar
ruanhaishen
Nodemcu Firmware
Commits
0f203f32
Commit
0f203f32
authored
Apr 20, 2015
by
Martin Han
Browse files
Resuce RAM Usage
parent
399e85f9
Changes
1
Hide whitespace changes
Inline
Side-by-side
lua_modules/dht_lib/dht_lib.lua
View file @
0f203f32
...
@@ -15,8 +15,6 @@
...
@@ -15,8 +15,6 @@
--AM2320 Not Test yet
--AM2320 Not Test yet
--Output format-> Real temperature times 10(or DHT22 will miss it float part in Int Version)
--Output format-> Real temperature times 10(or DHT22 will miss it float part in Int Version)
--For example, the data read form DHT2x is 24.3 degree C, and the output will be 243
---------------the data read form DHT1x is 27 degree C, and the output will be 270
--==========================Module Part======================
--==========================Module Part======================
local
moduleName
=
...
local
moduleName
=
...
local
M
=
{}
local
M
=
{}
...
@@ -42,8 +40,6 @@ local function read(pin)
...
@@ -42,8 +40,6 @@ local function read(pin)
bitStream
[
j
]
=
0
bitStream
[
j
]
=
0
end
end
-- Step 1: send out start signal to DHT22
-- Step 1: send out start signal to DHT22
gpio
.
mode
(
pin
,
gpio
.
OUTPUT
)
gpio
.
mode
(
pin
,
gpio
.
OUTPUT
)
gpio
.
write
(
pin
,
gpio
.
HIGH
)
gpio
.
write
(
pin
,
gpio
.
HIGH
)
...
@@ -62,7 +58,7 @@ local function read(pin)
...
@@ -62,7 +58,7 @@ local function read(pin)
while
(
gpio_read
(
pin
)
==
0
)
do
end
while
(
gpio_read
(
pin
)
==
0
)
do
end
c
=
0
c
=
0
while
(
gpio_read
(
pin
)
==
1
and
c
<
500
)
do
c
=
c
+
1
end
while
(
gpio_read
(
pin
)
==
1
and
c
<
500
)
do
c
=
c
+
1
end
-- Step 3: DHT22 send data
-- Step 3: DHT22 send data
for
j
=
1
,
40
,
1
do
for
j
=
1
,
40
,
1
do
while
(
gpio_read
(
pin
)
==
1
and
bitlength
<
10
)
do
while
(
gpio_read
(
pin
)
==
1
and
bitlength
<
10
)
do
...
@@ -74,70 +70,78 @@ local function read(pin)
...
@@ -74,70 +70,78 @@ local function read(pin)
while
(
gpio_read
(
pin
)
==
0
)
do
end
while
(
gpio_read
(
pin
)
==
0
)
do
end
end
end
end
end
---------------------------Convert the bitStream into Number through DHT11 Ways--------------------------
local
function
bit2DHT11
()
---------------------------Check out the data--------------------------
--As for DHT11 40Bit is consisit of 5Bytes
----Auto Select the DHT11/DHT22 By check the byte[1] && byte[3] -------
--First byte->Humidity Data's Int part
---------------Which is empty when using DHT11-------------------------
--Sencond byte->Humidity Data's Float Part(Which should be empty)
function
M
.
read
(
pin
)
--Third byte->Temp Data;s Intpart
read
(
pin
)
--Forth byte->Temp Data's Float Part(Which should be empty)
--Fifth byte->SUM Byte, Humi+Temp
local
byte_0
=
0
local
checksum
=
0
local
byte_1
=
0
local
checksumTest
local
byte_2
=
0
--DHT data acquired, process.
local
byte_3
=
0
local
byte_4
=
0
for
i
=
1
,
8
,
1
do
-- Byte[0]
for
i
=
1
,
8
,
1
do
-- Byte[0]
if
(
bitStream
[
i
]
>
3
)
then
if
(
bitStream
[
i
]
>
3
)
then
humidity
=
humidity
+
2
^
(
8
-
i
)
byte_0
=
byte_0
+
2
^
(
8
-
i
)
end
end
for
i
=
1
,
8
,
1
do
-- Byte[2]
if
(
bitStream
[
i
+
16
]
>
3
)
then
temperature
=
temperature
+
2
^
(
8
-
i
)
end
end
end
end
for
i
=
1
,
8
,
1
do
--Byte[4]
if
(
bitStream
[
i
+
32
]
>
3
)
then
for
i
=
1
,
8
,
1
do
-- Byte[1]
checksum
=
checksum
+
2
^
(
8
-
i
)
if
(
bitStream
[
i
+
8
]
>
3
)
then
byte_1
=
byte_1
+
2
^
(
8
-
i
)
end
end
end
end
if
(
checksum
~=
humidity
+
temperature
)
then
for
i
=
1
,
8
,
1
do
-- Byte[2]
humidity
=
nil
if
(
bitStream
[
i
+
16
]
>
3
)
then
temperature
=
nil
byte_2
=
byte_2
+
2
^
(
8
-
i
)
else
end
humidity
=
humidity
*
10
-- In order to universe the DHT22
temperature
=
temperature
*
10
end
end
for
i
=
1
,
8
,
1
do
-- Byte[3]
if
(
bitStream
[
i
+
24
]
>
3
)
then
end
byte_2
=
byte_2
+
2
^
(
8
-
i
)
---------------------------Convert the bitStream into Number through DHT22 Ways--------------------------
local
function
bit2DHT22
()
--As for DHT22 40Bit is consisit of 5Bytes
--First byte->Humidity Data's High Bit
--Sencond byte->Humidity Data's Low Bit(And if over 0x8000, use complement)
--Third byte->Temp Data's High Bit
--Forth byte->Temp Data's Low Bit
--Fifth byte->SUM Byte
local
checksum
=
0
local
checksumTest
--DHT data acquired, process.
for
i
=
1
,
16
,
1
do
if
(
bitStream
[
i
]
>
3
)
then
humidity
=
humidity
+
2
^
(
16
-
i
)
end
end
end
end
for
i
=
1
,
16
,
1
do
if
(
bitStream
[
i
+
16
]
>
3
)
then
for
i
=
1
,
8
,
1
do
-- Byte[4]
temperature
=
temperature
+
2
^
(
16
-
i
)
if
(
bitStream
[
i
+
32
]
>
3
)
then
byte_4
=
byte_4
+
2
^
(
8
-
i
)
end
end
end
end
for
i
=
1
,
8
,
1
do
if
(
bitStream
[
i
+
32
]
>
3
)
then
checksum
=
checksum
+
2
^
(
8
-
i
)
if
byte_1
==
0
and
byte_3
==
0
then
---------------------------Convert the bitStream into Number through DHT11's Way--------------------------
--As for DHT11 40Bit is consisit of 5Bytes
--First byte->Humidity Data's Int part
--Sencond byte->Humidity Data's Float Part(Which should be empty)
--Third byte->Temp Data;s Intpart
--Forth byte->Temp Data's Float Part(Which should be empty)
--Fifth byte->SUM Byte, Humi+Temp
if
(
byte_4
~=
byte_0
+
byte_2
)
then
humidity
=
nil
temperature
=
nil
else
humidity
=
byte_0
*
10
-- In order to universe with the DHT22
temperature
=
byte_2
*
10
end
end
end
else
---------------------------Convert the bitStream into Number through DHT22's Way--------------------------
--As for DHT22 40Bit is consisit of 5Bytes
--First byte->Humidity Data's High Bit
--Sencond byte->Humidity Data's Low Bit(And if over 0x8000, use complement)
--Third byte->Temp Data's High Bit
--Forth byte->Temp Data's Low Bit
--Fifth byte->SUM Byte
humidity
=
byte_0
*
256
+
byte_1
temperature
=
byte_2
*
256
+
byte_3
checksum
=
byte_4
checksumTest
=
(
bit
.
band
(
humidity
,
0xFF
)
+
bit
.
rshift
(
humidity
,
8
)
+
bit
.
band
(
temperature
,
0xFF
)
+
bit
.
rshift
(
temperature
,
8
))
checksumTest
=
(
bit
.
band
(
humidity
,
0xFF
)
+
bit
.
rshift
(
humidity
,
8
)
+
bit
.
band
(
temperature
,
0xFF
)
+
bit
.
rshift
(
temperature
,
8
))
checksumTest
=
bit
.
band
(
checksumTest
,
0xFF
)
checksumTest
=
bit
.
band
(
checksumTest
,
0xFF
)
...
@@ -151,35 +155,14 @@ local function bit2DHT22()
...
@@ -151,35 +155,14 @@ local function bit2DHT22()
if
(
checksumTest
-
checksum
>=
1
)
or
(
checksum
-
checksumTest
>=
1
)
then
if
(
checksumTest
-
checksum
>=
1
)
or
(
checksum
-
checksumTest
>=
1
)
then
humidity
=
nil
humidity
=
nil
end
end
end
---------------------------Check out the data--------------------------
----Auto Select the DHT11/DHT22 by checking the byte[1]==0 && byte[3]==0 ---
---------------Which is empty when using DHT11-------------------------
function
M
.
read
(
pin
)
read
(
pin
)
local
byte_1
=
0
local
byte_2
=
0
for
i
=
1
,
8
,
1
do
-- Byte[1]
if
(
bitStream
[
i
+
8
]
>
3
)
then
byte_1
=
byte_1
+
2
^
(
8
-
i
)
end
end
for
i
=
1
,
8
,
1
do
-- Byte[1]
if
(
bitStream
[
i
+
24
]
>
3
)
then
byte_2
=
byte_2
+
2
^
(
8
-
i
)
end
end
end
if
byte_
1
==
0
and
byte_2
==
0
then
byte_
0
=
nil
bit2DHT11
()
byte_1
=
nil
else
byte_2
=
nil
bit2DHT22
()
byte_3
=
nil
end
byte_4
=
nil
end
end
--------------API for geting the data out------------------
--------------API for geting the data out------------------
...
...
Write
Preview
Markdown
is supported
0%
Try again
or
attach a new file
.
Attach a file
Cancel
You are about to add
0
people
to the discussion. Proceed with caution.
Finish editing this message first!
Cancel
Please
register
or
sign in
to comment