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Printpix52
Joined: 18 Jun 2014
Posts: 282
Location: D.F.
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 Posted: Thu May 21, 2020 11:00 pm Post subject: PULSEIN_ARDUINO UNO |
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Hello
I have an ARDUINOUNO card with 16Mhz external crystal, would this help with the Pulsein numbers? Are you made of 4 Mhz to work? I have read it help but more information is missing. |
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Printpix52
Joined: 18 Jun 2014
Posts: 282
Location: D.F.
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| Posted: Fri May 22, 2020 6:26 pm Post subject: |
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Hello, so the library already includes a 16Mhz for arduino?
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O-Family
Joined: 23 May 2010
Posts: 320
Location: Japan
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| Posted: Sat May 23, 2020 2:56 am Post subject: |
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As for the pulse width, one count of the variable value is set to about 10uS regardless of the AVR clock frequency.
The hardware timer is not used, so the accuracy is poor. |
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Printpix52
Joined: 18 Jun 2014
Posts: 282
Location: D.F.
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| Posted: Sat May 23, 2020 5:20 am Post subject: |
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Hello O_Family Thank you for your response and I understand.
I have tested it with real STK500 hardware at 4MHz it works very well and instead with arduino one with 16 Mhz I have not tested it with this card and I will tell you tomorrow.
10us @ 4Mhz It works fine.
?? us @ 16Mhz I have not tried or already includes $ lib "pulsein.lib"? |
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Paulvk
Joined: 28 Jul 2006
Posts: 1257
Location: SYDNEY
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| Posted: Sat May 23, 2020 5:34 am Post subject: |
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You can change the timing I can not find the post from Mark but there is a "magic" number in the library you can change
I needed to make it faster for shorter pulses so look for "magic" in the library but first make a copy
and rename that to my pulsein or something so if you stuff up its just your copy.
Regards Paul |
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O-Family
Joined: 23 May 2010
Posts: 320
Location: Japan
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| Posted: Sat May 23, 2020 6:09 am Post subject: |
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It uses the @genus(x) routine to measure the pulse width.
@genus(x) counts the number of waits by calculating how many nanoseconds one machine language instruction takes for the AVR clock used. (Agree with Waitus command)
Therefore, this value is important because it derives the instruction clock cycle from the frequency value of the $crystal instruction.
Since it is measured by software, the error will be large in all respects.
With the additional library, you can change the timeout time for measurement and the measurement interval (initial value is 10uS).
Using a hardware timer is more effective than fine-tuning the library to improve measurement accuracy. |
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Paulvk
Joined: 28 Jul 2006
Posts: 1257
Location: SYDNEY
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| Posted: Sat May 23, 2020 7:04 am Post subject: |
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O-Family
| Quote: | | Using a hardware timer is more effective than fine-tuning the library to improve measurement accuracy. |
Yes but sometimes you can not.
It has been a long time since I made the Infrared decoder so my memory was poor.
I still use the code I made as it works with every remote I have tried.
Regards Paul hope you are safe and well! |
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Printpix52
Joined: 18 Jun 2014
Posts: 282
Location: D.F.
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| Posted: Sun May 24, 2020 6:48 pm Post subject: |
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Hello everyone!!
I made a program without error and all very well !!
To read RC signal for atmega8 @ 4Mhz
MAXIMUM = 174
AVERAGE = 145
MINIMUM = 113
Now for Arduino Uno @ 16Mhz
MAXIMUM = 193
AVERAGE = 160
MINIMUM = 126
Can someone tell me why I get different approximate values since I don't have an oscilloscope to measure RC signals. |
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O-Family
Joined: 23 May 2010
Posts: 320
Location: Japan
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| Posted: Tue May 26, 2020 11:00 am Post subject: |
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| I don't understand the question. |
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Printpix52
Joined: 18 Jun 2014
Posts: 282
Location: D.F.
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| Posted: Tue May 26, 2020 7:36 pm Post subject: |
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Hi !
testing with my STK500 card ok !!
To read RC with Atmega8 @ 4Mhz with PULSEIN and values are.
MAXIMUM = 174
NEUTRO = 145
MINIMUM = 113
| Code: | $regfile = "m8def.dat"
$crystal = 4000000
$hwstack=40
$swstack=16
$framesize = 32
'$sim
'Definir entradas
Config Pind.2 = Input
Ddrd.2 = 1
Config Lcdpin = Pin , E = Portc.1 , Rs = Portc.0
Config Lcdpin = Pin , Db4 = Portc.2 , Db5 = Portc.3
Config Lcdpin = Pin , Db6 = Portc.4 , Db7 = Portc.5
Config Lcdbus = 4
Config Lcd = 16x2
Cls
Cursor Off
Dim W As Word
Config Pind.2 = Input
Locate 1 , 1
Lcd "PROBADOR DE RC"
Waitms 100
Do
Pulsein W , Pind , 2 , 1
Locate 2 , 1
Lcd "PULSO ES " ; W ; " "
Loop
End |
Now with the ARDUINO UNO card ok!
Para leer RC con Atmega328p @ 16Mhz con PULSEIN y los valores son.
Now for Arduino Uno @ 16Mhz
MAXIMUM = 193
NEUTRO = 160
MINIMUM = 126
| Code: | $regfile = "m328pdef.dat"
$crystal = 16000000
$hwstack=40
$swstack=16
$framesize = 32
'Definir entradas
Config Pind.2 = Input
Ddrd.2 = 1
Config Lcdpin = Pin , E = Portc.1 , Rs = Portc.0
Config Lcdpin = Pin , Db4 = Portc.2 , Db5 = Portc.3
Config Lcdpin = Pin , Db6 = Portc.4 , Db7 = Portc.5
Config Lcdbus = 4
Config Lcd = 16x2
Cls
Cursor Off
Dim W As Word
Config Pind.2 = Input
Locate 1 , 1
Lcd "PROBADOR DE RC"
Waitms 100
Do
Pulsein W , Pind , 2 , 1
Locate 2 , 1
Lcd "PULSO ES " ; W ; " "
Loop
End
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Now with library $ lib "pulsein.lib"
Now for Arduino Uno @ 16Mhz
MAXIMUM = 193
NEUTRO = 160
MINIMUM = 126
| Code: | $regfile = "m328pdef.dat"
$crystal = 16000000
$hwstack=40
$swstack=16
$framesize = 32
'Definir entradas
Config Pind.2 = Input
Ddrd.2 = 1
$lib "pulsein.lib"
Config Lcdpin = Pin , E = Portc.1 , Rs = Portc.0
Config Lcdpin = Pin , Db4 = Portc.2 , Db5 = Portc.3
Config Lcdpin = Pin , Db6 = Portc.4 , Db7 = Portc.5
Config Lcdbus = 4
Config Lcd = 16x2
Cls
Cursor Off
Dim W As Word
Config Pind.2 = Input
Locate 1 , 1
Lcd "PROBADOR DE RC"
Waitms 100
Do
Pulsein W , Pind , 2 , 1
Locate 2 , 1
Lcd "PULSO ES " ; W ; " "
Loop
End
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Now we already saw all works well because different RC values come out and what are the real RC values?
Also I don't have an oscilloscope to measure RC signals.
Now and the library for what? but if the values are the same, could someone explain me? |
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O-Family
Joined: 23 May 2010
Posts: 320
Location: Japan
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| Posted: Wed May 27, 2020 1:47 am Post subject: |
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As mentioned earlier, the additional libraries are not meant to improve the accuracy of the [Pulsein] command.
Additional libraries allow you to change the measurement timeout and measurement interval.
You need to understand the help of [Pulsein].
---------------------------------------------------------------------------------------------
You can add a bitwait statement to be sure that the PULSEIN statement will wait for the start condition.
---------------------------------------------------------------------------------------------
In other words, it must be combined with the [BITWAIT] instruction to make the detection timing accurate.
If you want more accuracy, you can only use a hardware timer. |
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Printpix52
Joined: 18 Jun 2014
Posts: 282
Location: D.F.
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| Posted: Thu May 28, 2020 2:11 am Post subject: |
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Hello O_Family
First.- I have never worked in the library and it is the first time that I do.
Second.-I already read PULSEIN in help, just missing more information and also some example in the forum.
Third.-I made a test program atmega8 @ 4 Mhz with the library and we added and it marks error: 61 no idea what this means.
No sé dónde leo La Información. Ha pasado mucha Hora y investigando y nada.
'This problem is a little difficult to explain PULSEIN and BITWAIT.
Cheers!!
[img][/img][/code] |
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Printpix52
Joined: 18 Jun 2014
Posts: 282
Location: D.F.
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| Posted: Thu May 28, 2020 2:14 am Post subject: |
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| Code: | $regfile = "m8def.dat"
$crystal = 4000000
$hwstack=40
$swstack=16
$framesize = 32
'$sim
'Definir entradas
Config Pind.2 = Input
Ddrd.2 = 1
Config Lcdpin = Pin , E = Portc.1 , Rs = Portc.0
Config Lcdpin = Pin , Db4 = Portc.2 , Db5 = Portc.3
Config Lcdpin = Pin , Db6 = Portc.4 , Db7 = Portc.5
Config Lcdbus = 4
Config Lcd = 16x2
Cls
Cursor Off
$lib "pulsein.lib"
Const Cpulsein_timeout = 50000
Dim Bpulsein_delay As Byte : Bpulsein_delay = 10
Dim W As Word
Config Pind.2 = Input
Locate 1 , 1
Lcd "PROBADOR DE RC"
Waitms 100
Do
Pulsein W , Pind , 2 , 1
Locate 2 , 1
Lcd "PULSO ES " ; W ; " "
Loop
End |
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Printpix52
Joined: 18 Jun 2014
Posts: 282
Location: D.F.
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| Posted: Thu May 28, 2020 6:48 am Post subject: |
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Hello everyone!!
I already corrected the code but I do not understand what it is for.
What is the function? It no longer marks me error.
| Code: | $lib "pulsein.lib"
Const Cpulsein_timeout = 0
Const Bpulsein_delay = 10
'Definir entradas
Config Pind.2 = Input
Ddrd.2 = 1
Config Lcdpin = Pin , E = Portc.1 , Rs = Portc.0
Config Lcdpin = Pin , Db4 = Portc.2 , Db5 = Portc.3
Config Lcdpin = Pin , Db6 = Portc.4 , Db7 = Portc.5
Config Lcdbus = 4
Config Lcd = 16x2
Cls
Cursor Off
Dim W As Word
Config Pind.2 = Input
Locate 1 , 1
Lcd "PROBADOR DE RC"
Waitms 100
Do
Pulsein W , Pind , 2 , 1
Locate 2 , 1
Lcd "PULSO ES " ; W ; " "
Loop
End |
Reading RC signal
MAXIMO=160
NEUTRO=132
MINIMO=104
Could someone explain this function to me?
| Code: | $lib "pulsein.lib"
Const Cpulsein_timeout = x
Const Bpulsein_delay = xx |
Good evening and greetings !!! |
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O-Family
Joined: 23 May 2010
Posts: 320
Location: Japan
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| Posted: Thu May 28, 2020 11:34 am Post subject: |
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If this does not stabilize the reading, your signal may be unstable.
The pulse width of servo motor is generally 0.8mS-2.2mS.
| Code: |
Do
Bitwait Pind.2 , Reset
Pulsein W , Pind , 2 , 1
Locate 2 , 1
Lcd "PULSO ES " ; W ; " "
Loop
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