Usart problem on ATxmega384C3

P_Santos · Joined: 07 Jul 2011 Posts: 114

Hello,

I'm use the Xmega384C3 to communicate to a HM11 Bluetooth module

If i send the command Print #5 , "AT+DISC?" from a computer with serial adapter, the HM11 understand every time the commnd and respond correctly,
but if send the same command trough the microcontroller, it works only one or two times

Can anyone help?
What make i wrong?
This is the code for setup the Usart and Timer

'****************************** Usart for HM11 *********************************
' portE.2/portE.3 - to BLE HM11
Config Com5 = 9600 , Mode = Asynchroneous , Parity = None , Stopbits = 1 , Databits = 8
Open "Com5:" For Binary As #5
Config Serialin4 = Buffered , Size = 70
'*******************************************************************************
'***************************** TIMER ******************************
Config Priority = Static , Vector = Application , Lo = Enabled ' , Med = Enabled , Hi = Enabled
'Timer C0
Config Tcc0 = Normal , Prescale = 1024
Tcc0_per = 31250
On Tcc0_ovf acorda 'Setup overflow interrupt do Timer/Counter C0
Enable Tcc0_ovf , Lo 'Activa overflow interrupt em LOW Priority
'******************************************************************

Best regards and thanks for help

P_Santos

(BASCOM-AVR version : 2.0.8.1 )

EDC · Joined: 26 Mar 2014 Posts: 971

By default, after Print command Bascom add <CR><LF>
If you add semicolon at the end then those two characters will not be added. Then you can add one of them yourself.
Try one of this commands:

P_Santos · Joined: 07 Jul 2011 Posts: 114

Hello EDC,

Thank you, but it continue not working

Attached pictures of logic analyser of both, send trough serial adapter and from Atxmega TX pin

The voltage on the serial adapter TX is about 3,26V, on the Atxmega TX pin is about 3,21V

Tested with other terminal programms, send AT+DISC? with 10 or 13 or nothing on the end, the HM11 understand all that

The Usart configuration is
' portE.2/portE.3 - BLE HM11
Config Com5 = 9600 , Mode = Asynchroneous , Parity = None , Stopbits = 1 , Databits = 8
Open "Com5:" For Binary As #5
Config Serialin4 = Buffered , Size = 70

The command from the Atxmega is Print #5, "AT+DISC?"

What is my mistake?

Best regards
P_Santos

EDC · Joined: 26 Mar 2014 Posts: 971

It looks like some baudrate error.
Do you try automatic clock calibration?
After Config clock and Config Sysclock for your config/speed try add last two lines from this example.

P_Santos · Joined: 07 Jul 2011 Posts: 114

Sorry, the same result, mention of framming error

Regards

EDC · Joined: 26 Mar 2014 Posts: 971

Better add to topic short but complete code that can be compiled.
Like this but with your settings.
Remember that declared $crystal=xxxxxxxxxx should/must match your Sysclock settings because registers for baudrate are set for clock speed you declare in "$crystal".
If real speed of uC is different then you end with result like yours.

P_Santos · Joined: 07 Jul 2011 Posts: 114

Hello IDC,

You are good

Now it works after add 32khzosc = Enabled to my Config Osc = Disabled , 32mhzosc = Enabled

now is: Config Osc = Disabled , 32mhzosc = Enabled , 32khzosc = Enabled

A question, why is Config Osc = Disabled, must it be Enabled

Thank you very much

Best reagards

P_Santos

EDC · Joined: 26 Mar 2014 Posts: 971

Explanation for the question is in Help/Wiki page. Read -> https://wiki.mcselec.com/bavr/CONFIG_OSC
You can always hit F1 in the Bascom code editor if cursor blink near some statements Very Happy

On the mcs main page you can find section Application Notes where one of the topic is 'Statring with Xmegas"

Direct link -> https://www.mcselec.com/index.php?option=com_content&task=view&id=306&Itemid=57

..but is worth to read more of them Wink