Thread: Hyperterminal and MPLAB in C

Hi im sorry I am extremely new, I just started using C at my internship and am stuck on doing the basic code below and being able to communicate with the microcontroller p33FJ256GP710. I want to simply be prompted and then give it an integer for it to evaluate just to show my bosses that I can communicate with the microcontroller via hyperterminal prior to the full programming process. heres my code:

Code:

#include <stdio.h>
int main()
{
int number;
printf("you are being prompted for either a one or a zero");
scanf("%d",&number);

if (number==1)
{
printf("You put a 1!");
}
else if (number==0)
{
printf("You put a 0!");
}
else
{
printf("You put something besides a 1 or 0");
}
return 0;
}

Is this the code that is running on your embedded processor board? If it is how did you configure the serial port parameters? Are you sure that the printf() and scanf() routines are actually set to use the serial port for input and output?

Jim

I am not sure. sorry I am literally brand new to programming yesterday. How would I change those to output in say an open hyperterminal file? Or is this completely wrong?

Thank you for the very quick response!

More information: I am connected to the development board and am tyring to program a microncontroller. I am also connected via usb to my computer through a COM port which I am connected to hyperterminal with. Any other questions please feel free to ask me, sorry again I am not quite in with what exactly occurs during programming but hey i'm hoping to learn.

Have you looked through your documentation for MPLAB? There are instructions in the "C Compiler Getting Started Guide" that may help.

Jim

Ah I see I will take a look here. I am using C-30 I will look the starter guide for that. Thank you Jim.

Hey if anyone else has any pointers I really need them. NOne of those had any information about Serial Ports except using MPLAB SIM which I've already done. I need to use hyperterminal, if theres anything anyone thinks might work that would help a lot. I have two days to do this and am not sure at all how to do this at all.

Its a pumpkin CUBESat development board. I cannot find any of these kinds of files, how would I get text to be printed in hyperterminal in the first place? Like does printf automatically print out in the hypertermnial or do i have to switch the output somehow? Thank you.

OK thank you guys! I will try that forum, and yes I have both of those manuals. So it does have to do with some pin connections, I firgured it wouldn't be all that simple. OK well thank you very much!

my question is, your showing your boss that you can do this, using hyper to talk to a pic, when you have no idea how to do it?
how did you get the internship, that seems to be microcontroller programming, and control, if you have no background in this?

usually with a pic there isn't standard input/output. instead there are low level calls to read and write characters to the serial port. printf almost certainly does not work. if you want formatted I/O, use sprintf then output to the serial port using the low level calls.
Initialization is dependent on what your board supports, but the PIC chip has the uart built in so their library calls are usually all
you need.
like everyone said, use the documentation that came with your board.

Code:

// example non-interrupt initialization code called once at startup
// if you want polled mode
    UARTConfigure     (UART1, UART_ENABLE_PINS_TX_RX_ONLY | UART_ENABLE_HIGH_SPEED | UART_INVERT_TRANSMIT_POLARITY | UART_INVERT_RECEIVE_POLARITY);
    UARTSetLineControl(UART1, UART_DATA_SIZE_8_BITS | UART_PARITY_NONE | UART_STOP_BITS_1);
    UARTSetDataRate   (UART1, GetPeripheralClock(), baud);
    UARTEnable        (UART1, UART_ENABLE_FLAGS(UART_PERIPHERAL | UART_RX | UART_TX));


// transmit a byte
if (UARTTransmitterIsReady(UART1)) UARTSendDataByte(UART1,(BYTE)b);

// receive a byte
if (UARTReceivedDataIsAvailable(UART1))  b = UARTGetDataByte(UART1);