Ascii Help

katiepwr

Hi guys

i am having quite a problem here, i have spent some time on this and was wandering it anyone can help me?

i have my mikroelectronika PICeasy3 board connected to my pc via rs-232, on my pc i have a visual basic interface.

when i test the communication i send down say chr(65) on the vb side and hence i want to display the charachter A on my LCD.

my c program goes like:

char txt

LCD_init(2400)
.
.
.
.
LCD_config (1,1,text)

ALL i get on my LCD is strange letters, does anybody know what i should do so that my board recognises exactly what i am sending down??

Mutant_Fruit

char txt

LCD_init(2400)
.
.
.
.
LCD_config (1,1,[B]text[/B]) 

Shouldn't you have written "txt" instead of "text"?

katiepwr

thank you mutant fruit

text is just a variable, in my vb program i have:

'Event for sending data to the serial port
Private Sub cmdSend_Click()

MSComm1.Settings = "2400,n,8,1" 'Making an assumption here
MSComm1.CommPort = 1 'Another assumption
MSComm1.PortOpen = True
MSComm1.Output = Text1.Text
MSComm1.PortOpen = False

End Sub

so what ever i type into my textbox i want to display this onto the LCD, i have c code to take in the contents of the serial port but when i send for example A in vb the LCD doesnt display A it displays an unknown character sort of like chinese

thanx again

Mutant_Fruit

but havn't you declared it as "char txt" as opposed to "char text", so shouldn't you have written "txt" as opposed to "text"?

katiepwr

hi mutant fruit

sorry that was just a typing error. i have it the code working as far as i know its just that it doesnt seem to recognise what i am inputting form vb??

lynchie

I guess the lcd display you have takes ascii character sequences? I think VB will return a unicode string from the .Text property. You may need to convert this to ascii before sending it to the com port. I guess you can test this quickly by counting the number of bytes in the .text property if thats possible. Haven't touched vb in ages so am not sure how thats done.

Mutant_Fruit

try sending just the integer 65 (as opposed to chr(65)). Your C code should cast that to a char without a problem and display it correctly as a letter. If that displays, it means there is something dodgy with your VB code.

katiepwr

yea i was thinking it could be the vb side of things but was worried that i would have to set up the LCD manually.

Do you think that the LCD only accepts ascii charachters, i am new to vb, does anyone have a small example that i can test out please?

would i use something like atoi

thanks lads

charlo_b

maybe try :

mscomm1.portopen = true

'this loop will send the ascii value for each character in the textbox
for i = 1 to len(text1.text)    
     mscomm1.output = asc(mid(text1.text,i,1))        
next

mscomm1.portopen = false

Do you not have a programmers manual for this LCD Display it should tell you what it expects to receive!