Problem to receive character in PIC18

[nurul]

hii..

My PIC18 has problem to receive a character from PC. I'm using Visual Basic 6 in PC to give command to PIC to read current temperature. I'm also using zigbee to transmit and receive data between PC and PIC. The coding in VB6 is to send a character 'a' when button command is clicked. So my PIC18 should receive the character and execute the next line of instruction where to measure temperature. How to read the character in PIC and proceed the next line using soft_uart?
I've tried this coding but the PIC seems like not receive the character..
Soft_UART_Read(inputr);

if (inputr == 'a')
{
measure temperature
}

[shahrul]

I've tried this coding but the PIC seems like not receive the character..
Soft_UART_Read(inputr);

if (inputr == 'a')
{
measure temperature
}

What compiler you use that function?

[kl84]

Did you successfully compiled the code? What's the Sof_UART_Read(inputr)'s actual code?

[nurul]

Thank you for ur reply
i use mikroC compiler version 8.2..
i successfully compiled the code..but i'm not sure on the coding..i've tried the template in help but it's not working.. my PC can receive the temperature using soft_uart_write function..i want to add a command from PC to request sensor to read the temperature..how pic wants to receive a character and execute the measuring code? actually when i click command button in PC it sends 'aaaaaa' non-stop..i assume when the pic receive 'a', the next line will run..

[Brian Griffin]

Thank you for ur reply
i use mikroC compiler version 8.2..
i successfully compiled the code..but i'm not sure on the coding..i've tried the template in help but it's not working.. my PC can receive the temperature using soft_uart_write function..i want to add a command from PC to request sensor to read the temperature..how pic wants to receive a character and execute the measuring code? actually when i click command button in PC it sends 'aaaaaa' non-stop..i assume when the pic receive 'a', the next line will run..

Do you have a full code here so that we can point out the problem?

Also - what is the microcontroller used there?

[nurul]

I use PIC18F4558 with mikroc v8.2..

I've tried the coding below for PIC using mikroC to turn on LED if the PIC receive the command from VB, just for testing but it doesn't work. Where should i include to receive the 'a' in the coding? Plz help me..Is it Soft_Uart_Read must be used with Soft_Uart_Write? My problem is i just want to receive the character 'a' and go to next line, which is no need the write function..is there any other method which can solve my problem? Plz help me

do
{
data = Soft_Uart_Read(rec);
} while (!*rec);

if (data)
{
PORTB = 0x80;
}

[aurora]

Did you use pointer intentionally? Try remove * from ! *rec
Did you declare data as char or int?
Did you assign data = 'a'?

[nurul]

Did you use pointer intentionally? Try remove * from ! *rec
Did you declare data as char or int?
Did you assign data = 'a'?

I've tried by remove the * but still not working..
i've also tried to declare the data as char or unsigned short as in the template but still doesn't works..
yes, i did the code:
if(data='a')
i'm still wondering why the soft_uart_write should be used together with the soft_uart_read..it seems like if the write function not included an error of _invertMaskWr:argument not found occurs..
maybe the PIC can't receive data from PC by using mikroc software..how to solve my problem?

[aurora]

Seems like an old problem from an old thread: here

How about changing

data = Soft_Uart_Read(rec); into
data = Soft_Uart_Read(&rec);

source: here