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Duval JP
Joined: 22 Jun 2004
Posts: 1161
Location: France
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 Posted: Tue Nov 21, 2023 10:42 am Post subject: |
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hi
As EDC said : take car to the baud rate
in the tab program.s to the to of Nextion IDE you have to write
[img]
with you baud rate
to get a text I use this function
| Code: |
'*******************************************************************************
'get a text from a tool sending a text
'*******************************************************************************
Function Nex_gettxt() As String
Local Gtext As String * 15
Local Svalue As String * 30
Svalue = ""
Gtext = "get " + Text_id + ".txt" 'Request The text of the device
Print#nex , Gtext;
Nexend 'macro which send &hFF,&hFF,&hFF
Call Nex_return()
For Jb = 2 To 30
If Tabreturn(jb) <> 255 Then
Svalue = Svalue + Chr(tabreturn(jb))
Else
Exit For
End If
Next
Nex_gettxt = Svalue
End Function |
with the sub nex_return()
| Code: |
'*****************************************************************************
' to know the reply from nextion
' this version use a 4 lines lcd display to visualize so you have to remark
'the lcd lines
'******************************************************************************
Sub Nex_return()
Nexbyte = 0
Flagcar = 0
Do
If Ischarwaiting(#nex) = 1 Then 'we fill an array of byte received---
Incr Nexbyte
Tabreturn(nexbyte) = Inkey(#nex)
Debug #usb , Hex(tabreturn(nexbyte)) ; " ";
If Tabreturn(nexbyte) = 255 Then 'we count the "end char"
Flagcar = Flagcar + 1
End If
Elseif Ischarwaiting(#nex) = 0 And Flagcar = 3 Then 'We are waiting for the end of the reception nbyte>0
If Flagcar = 3 Then
Flagcar = 0
Nexbyte = 0
' Waitms 10
Exit Do
End If
' Elseif Ischarwaiting(#nex) = 0 And Flagcar = 0 Then
' Exit Sub
End If
Loop
Select Case Tabreturn(1)
Case 0
'init ok
Case 101 'hex 65 'touche event
Page_id = Tabreturn(2)
Device_id = Tabreturn(3)
Event_id = Tabreturn(4)
Case 102 'hex66 'current page number
Case 103 'hex67 use for awake
'Tabreturn(2) = coordinate x
' Tabreturn(3) = coordinate x
'Tabreturn(4) = coordinate Y
'Tabreturn(5) = coordinate Y '
Case 104 'hex68 use for sleep
'Tabreturn(2) = coordinate x
' Tabreturn(3) = coordinate x
'Tabreturn(4) = coordinate Y
'Tabreturn(5) = coordinate Y '
' Cls
Case 112 'hex 70 chaine de caractère
' each byte of tabreturn(n) is converted to char(aascii)
Case 113 ' hex 71 numeric value on 4bytes see Function Nex_onevalue
'Tabreturn(2) =byte
' Tabreturn(3) = *256
'Tabreturn(4) = *65536
'Tabreturn(5) = *16777216
Case 136 'hex 88 'init ok
Debug #usb , "Init ok"
'Waitms 100
Case Else
Debug #usb , "error Next : " ; Hex(tabreturn(1))
Ret_init '*******************************************20-06-2020--------------
Wait 1
If Tabreturn(1) = 2 Then Nex_init
Ret_init
End Select
End Sub
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the function give you the string in svalue , the var jb give you the ascii value of each character
I hope it can help you
nex time add your hmi file to give you a better answers
what kind of display are you using (discover.. intelligent ..)?
JP 
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rwlee
Joined: 04 Aug 2008
Posts: 36
Location: La Porte, Texas
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| Posted: Thu Nov 23, 2023 2:31 am Post subject: Thanks For the Help |
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Thanks guy's, My Computer was baking cookies and i haven been able to post any reply's for a couple days.
I found how to change the baud in the Nextion Editor so I bumped up the speed to a typical used baud rate baud=115200
That workes fine, Thanks again for everyone help! |
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rwlee
Joined: 04 Aug 2008
Posts: 36
Location: La Porte, Texas
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| Posted: Thu Nov 23, 2023 10:15 pm Post subject: |
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Duval JP,
Thanks,
I am working with 2 different displays, Nextion Enhanced NX3224K024 2.4" and a 5.0″ Enhanced NX8048K050. 2 years ago you helped me with so much, and I though I had it all figured out, then I lost a hard drive and lost all of my work and learning. So now back to the drawing board so to speak! I ran into a very strang issue yesterday, When I send a "t0.txt" via a button from the Nextion it will trigger the Serial interrupt but when I send a "n0.val" it wont and I get nothing, I hava 2 serial moniters runing one for com1 #Usb and one for com2 #Nex the incoming terminal shows the the Hex Val 03 00 00 00 from the Nextion display but nothing captured from the ATMEGA2560,
What Am I missing?
| Code: |
$Regfile="m2560def.dat"
$crystal = 16000000 ' used crystal frequency
$hwstack = 256
$swstack = 128
$framesize = 256
Config Submode = New
'$baud = 19200
Config Submode = New
Debug On
Enable Interrupts 'Off '
'***debug serial port **************************************************************
Config Com1 = 115200 , Synchrone = 0 , Parity = None , Stopbits = 1 , Databits = 8 , Clockpol = 0
Echo Off
Config Serialin0 = Buffered , Size = 30 'RX from Terminal
Config Serialout0 = Buffered , Size = 30
Open "COM1:" For Binary As #1
Const Usb_ = 1
'---nextion serial port-------------------------------------------------------------------------------------------------------------
Config Com2 = 115200 , Synchrone = 0 , Parity = None , Stopbits = 1 , Databits = 8 , Clockpol = 0 '19200 modif pour ecran intelligent
Config Serialin1 = Buffered , Size = 50
Config Serialout1 = Buffered , Size = 30
Open "COM2:" For Binary As #2
Const Nex_ = 2
config PORTb.7 = Output
Led_ alias PORTb.7
Dim Buf_ as Byte
Dim Char As Byte
Dim Last_Bte(5) as Byte ' Byte Value
'Dim Last_str(5) as Byte ' String Value
Dim Resultstring As String * 4
Dim Cntr_ as Byte
Print #Usb_ ,"Start"
Buf_ = Ischarwaiting(#Nex_)
Print #Usb_ , Buf_
If Buf_ = 1 then
For Cntr_ = 0 to 4
Char = Inkey(#Nex_)
Toggle Led_
Select Case Char
Case 13 : 'CarriageReturn ->swallow
Case 255 : 'NewLine ->got string ->processing
Resultstring = "" 'clear the string for new message
Case Else
Cntr_ = Cntr_ + 1 ' Counter Bytes collected for testing purposes
Resultstring = Resultstring + Chr(char)
Last_Bte(Cntr_) = Resultstring
Print #Usb_, Cntr_
Print #Usb_ , Last_Bte(Cntr_)
'Print #Usb_ , Last_str(Cntr_)
End Select
Next
End If
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Thanx |
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Paulvk
Joined: 28 Jul 2006
Posts: 1257
Location: SYDNEY
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| Posted: Fri Nov 24, 2023 4:02 am Post subject: |
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Having programmed Nextion displays to directly control my inverters I can recommend looking into the reparse
mode where you control the serial of the display it opens great opportunity in data transmission where you add
CRC and start and end to your serial. Once you have start and end characters you can use Bascom bytematch
where it triggers an interrupt apon receiving a specific byte normally at the end of the data (use a byte that is an
not normally used character like 185) you can then in the interrupt find the beginning , check the CRC and quickly
process the data with an avr running at 16 to 20 Mhz
I am having no trouble processing data from a device that sends at 115200 baud every second and still able
to flash a led in the main loop once a second
I explain the reparse mode here https://unofficialnextion.com/t/how-to-use-the-reparse-mode/1270
I found using t0.txt and n0.val was not helpful as it did not tell me what they were so I gave them names
like tresult.txt and ninput.val then when I looked at the bascom code I know what it does.
Regards Paul |
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Duval JP
Joined: 22 Jun 2004
Posts: 1161
Location: France
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| Posted: Fri Nov 24, 2023 4:14 pm Post subject: |
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hi rwlee
now you can make backups of your disks. i made 3 of them  1 every day, 1every week, one every month
Nextion is 
| Quote: | | When I send a "t0.txt" via a button from the Nextion it will trigger the Serial interrupt but when I send a "n0.val" it wont and I get nothing, |
did you try with the debug of nextion ide (put you page in first position to do) ?
maybe the touch release event or touch press event are not well assigned
othe problem to get numeric value , I use the function
| Code: |
'*******************************************************************************
' get a value from a tool sending a value from byte to long
'*******************************************************************************
Function Nex_value() As Long
Local Gtext As String * 15
Local Xvalue As Long
Local Bvalue As Long
' Local Lvalue2 As Long
Gtext = "get " + Text_id + ".val" 'Request The Actual Value
Print#nex , Gtext;
Nexend 'macro which send &hFF,&hFF,&hFF
Call Nex_return() 'my sub to receive from nextion
Debug #usb , Tabreturn(1) ; " " ; Tabreturn(2) ; " " ; Tabreturn(3) ; " " ; Tabreturn(4) ; " " ; Tabreturn(5) ; " " ; Tabreturn(6)
Xvalue = Tabreturn(2)
Bvalue = Tabreturn(3) * 256
Xvalue = Xvalue + Bvalue
Bvalue = Tabreturn(4) * 65536
Xvalue = Xvalue + Bvalue
Bvalue = Tabreturn(5) * 16777216
Xvalue = Xvalue + Bvalue
Debug #usb , Xvalue ; " " ;
Nex_value = Xvalue
End Function |
but you have to check with the nextion debbuger before use it to know the number of byte to prossess
in your code
Resultstring = Resultstring + Chr(char)=====> is a string
Last_Bte(Cntr_) = Resultstring ======> is a array of byte
you're mixing up type or I don't understand
JP
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rwlee
Joined: 04 Aug 2008
Posts: 36
Location: La Porte, Texas
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| Posted: Fri Nov 24, 2023 11:28 pm Post subject: Thanks Duval JP |
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I downloaded your program (nextion AVR1284 first step)and changed Nothing,
I only added 2 Print lines, Because I was only gettin one input from the Bascom Serial Monitor
So I Added a print statment to try and Locate what the 80 was coming from.
I found it!
It it doesn't go through the Select Case Statment and wont print the Device_Id
Do you thinkit has anything to do with the fact that I'm using a ATMEGA2560?
I only modifed your code to use with my 2560 Everything else is original
When testing with my second Serial Monitor I can see that the Nextion screen is outputing the proper info on the touch screen event
| Code: |
'Fist steps with nextion and AT1284
'I use Nextion since 4years now I can give some tips to my bascom friends
'Jp Duval 24-08-2022---------------------------------------------------------------------------------------------------
'-----------------------------------------------------------------------------------------------------------------------------
$Regfile="m2560def.dat"
$crystal = 16000000 ' used crystal frequency
$hwstack = 256
$swstack = 128
$framesize = 256
Config Submode = New
'$regfile = "m1284pdef.dat" ' "m1284def.dat"
'$crystal = 11052000
'$hwstack = 300 '300
'$swstack = 250 '200
'$framesize = 250 '300
Config Submode = New
Debug On 'Off 'On '
'***debug serial port **************************************************************
Config Com1 = 115200 , Synchrone = 0 , Parity = None , Stopbits = 1 , Databits = 8 , Clockpol = 0
Echo Off
Config Serialin0 = Buffered , Size = 30 'RX from Terminal
Open "COM1:" For Binary As #1
Const Usb = 1
'M1284------------------------------------
' RXD0= yellow to PD0
' TXD0=yellow to PD1
'---nextion serial port-------------------------------------------------------------------------------------------------------------
Const Nex = 2
Config Com2 = 38400 , Synchrone = 0 , Parity = None , Stopbits = 1 , Databits = 8 , Clockpol = 0 '34800 modif le 24-06-2022
'Config Com2 = 115200 , Synchrone = 0 , Parity = None , Stopbits = 1 , Databits = 8 , Clockpol = 0 '19200 modif pour ecran intelligent
Open "COM2:" For Binary As #2
Config Serialin1 = Buffered , Size = 50
Config Serialout1 = Buffered , Size = 30
' RXD1= yellow to PD3
' TXD1= Blue to PD2
' include files
'*******************************************************************************
$include "declaration_nextion.inc"
$include "sub_macro_nextion_base.inc"
'*******variable to use with nextion**************************************************
Dim Tabreturn(20) As Byte 'array of byte returned by nextion
Dim Flagcar As Byte
Dim Page_id As Byte , Device_id As Byte , Event_id As Byte
Dim Letter_id As String * 10
Dim Nexbyte As Byte
Dim Neximage As Byte , Xval As Word , Yval As Word
Dim Sentence As String * 30
Dim Text_id As String * 5
Dim Mynum As Long
'**** generic Variables*************************************************************
Dim Jb As Byte , Nbyte As Byte , Jbyte As Byte , Jword As Word
'*******************************************************************************
Enable Interrupts
Begin:
Do
' 'Ret_init
' Waitms 20
Device_id = 0
Call Nex_return()
Print #usb , "Device_id " ; Device_id ' Call Nex_returntime()
Waitms 10
If Device_id <> 0 Then Print #usb , "device_id menu :" ; Device_id
Select Case Device_id
Case 1 'play with the frog
If Neximage = 1 Then
Neximage = 0
Letter_id = "t1"
Call Nex_text(letter_id , "Aaaarg" , White , Red , 0)
Elseif Neximage = 0 Then
Neximage = 1
Letter_id = "t1"
Call Nex_text(letter_id , "Croa-croa" , Red , Lightblue , 0)
End If
Xval = 39
Yval = 11
Call Nex_image(xval , Yval , Neximage)
Letter_id = "t1"
' '-----------------------------------------------
Case 4 'reading a text
Text_id = "t2"
Sentence = Nex_gettxt() As String
Letter_id = "t1"
Call Nex_text(letter_id , Sentence , Green , Yellow , 0)
' '-----------------------------------------------
Case 5 'reading a number
Text_id = "n0"
Mynum = Nex_value() As Long
Letter_id = "t1"
Sentence = Str(mynum)
Call Nex_text(letter_id , Sentence , Yellow , Green , 0)
'-----------------------------------------------
Case 6 'reading a value from a slide bar
Text_id = "h0"
Mynum = Nex_value() As Long
Letter_id = "t1"
If Mynum > 0 And Mynum < 501 Then 'to cancel the erratic reading
Sentence = Str(mynum)
Call Nex_text(letter_id , Sentence , Yellow , Green , 0)
Waitms 100
End If
End Select
Loop
End
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And from the Inc file
| Code: |
Sub Nex_return()
Nexbyte = 0
Flagcar = 0
Do
If Ischarwaiting(#nex) = 1 Then 'we fill an array of byte received---
Incr Nexbyte
Print #usb, "Nexbyte " ; Nexbyte ' ********* Check how many bytes are recieved, I can only see one byte per touch event *********
Tabreturn(nexbyte) = Inkey(#nex)
Debug #usb , Hex(tabreturn(nexbyte)) ; " ";
If Tabreturn(nexbyte) = 255 Then 'we count the "end char"
Flagcar = Flagcar + 1
End If
'page_id = Tabreturn(2)
'Device_id = Tabreturn(3)
'event_id = Tabreturn(4)
'Print #usb , "page_id " ; page_id
'Print #usb , "Device_id " ; Device_id
'Print #usb , "event_id " ; event_id
Elseif Ischarwaiting(#nex) = 0 And Flagcar = 3 Then 'We are waiting for the end of the reception nbyte>0
If Flagcar = 3 Then
Flagcar = 0
Nexbyte = 0
' Waitms 10
Exit Do
End If
' Elseif Ischarwaiting(#nex) = 0 And Flagcar = 0 Then
' Exit Sub
End If
Loop
Print #usb , "Tabreturn " ; Tabreturn(1)
Select Case Tabreturn(1)
Case 0
'init ok
Case 101 'hex 65 'touche event
page_id = Tabreturn(2)
Device_id = Tabreturn(3)
event_id = Tabreturn(4)
Case 102 'hex66 'current page number
Case 103 'hex67 use for awake
'Tabreturn(2) = coordinate x
' Tabreturn(3) = coordinate x
'Tabreturn(4) = coordinate Y
'Tabreturn(5) = coordinate Y '
Case 104 'hex68 use for sleep
'Tabreturn(2) = coordinate x
' Tabreturn(3) = coordinate x
'Tabreturn(4) = coordinate Y
'Tabreturn(5) = coordinate Y '
' Cls
Case 112 'hex 70 chaine de caractère
' each byte of tabreturn(n) is converted to char(aascii)
Case 113 ' hex 71 numeric value on 4bytes see Function Nex_onevalue
'Tabreturn(2) =byte
' Tabreturn(3) = *256
'Tabreturn(4) = *65536
'Tabreturn(5) = *16777216
Case 136 'hex 88 'init ok
Debug #usb , "Init ok"
'Waitms 100
Case Else
Debug #usb , "error Next : " ; Hex(tabreturn(1))
Ret_init '*******************************************20-06-2020--------------
Wait 1
If Tabreturn(1) = 2 Then Nex_init
Ret_init
End Select
End Sub
'******************************************************************************
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But I can tell it's not going through the Select case Statement! |
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rwlee
Joined: 04 Aug 2008
Posts: 36
Location: La Porte, Texas
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| Posted: Sat Nov 25, 2023 4:46 am Post subject: Found the Problem! |
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| It was as simple as I didn't notice that I had left your exsisting Baud Rate at 38400 and my Baud rate on my Nextion was 115200! messing with my head all day long. Everything is working now. Thanksfor your help JP! it was your simple program thathasme on the right track again! |
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Duval JP
Joined: 22 Jun 2004
Posts: 1161
Location: France
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| Posted: Sat Nov 25, 2023 9:51 am Post subject: |
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rwlee,
Thank you for your last message it's always a great pleasure to be able to help a friend on the other side of the world, that's the beauty of the internet.
and please make backups JP
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