Hi. Im having a hard time getting my program to compile using this command. Example:

#pragma config(Sensor, S1, HTRCX, sensorI2CCustom)

#include "HTRCX-driver.h"
int rcxmessage[0];
bool rcxmessagesuccess = 0;
task main ()
{
while (1==1)
{
if (HTRCXreadResp(HTRCX, rcxmessage,rcxmessagesuccess ) != 0)
{
rcxmessage = HTRCXreadResp(HTRCX, rcxmessage,rcxmessagesuccess);

eraseDisplay();

nxtDisplayString(3, "RCX: %d", rcxmessage);
}
}
}

Can someone please tell me the proper way to use this command? Thanks.

You want to display the message received from the RCX, right? I think that this code will accomplish that:(Please put your code in the tags next time.)

I'm not positive, but I think this should work. I've never used the IRLink with the RCX in RobotC before.

Try this code:


Please note that HTRCXreadResp() is flaky at the best of times and dumps the whole register, so be sure to check more than just rcxmessage[0]. I never got it working reliably as a means to read something from the RCX. The buffer will be overwritten in the sensor whenever something new comes along. It's a real pain in the butt.

- Xander

Thanks guys I knew it was something simple. Ill report back on how I make out with this.

No problem sending to the RCX but receiving, as far as I can tell, is a no go.

Did you try what Xander said and read the whole register? You can use a "for()" loop for that instead of typing out the display command 8 times.

Im sorry im no programming expert, I use Robot C because NXT-G is almost unusable. I really dont know what you mean by "the whole register". Ill show you what I tried..
NXT Program:



RCX Program:



So far I am finding Robot C to be a great programming environment for the NXT its just when it comes to hex things and registers I become lost. Thanks for all the help and if you can think of any online sources where I could read on this a bit more I would be most grateful. Thanks again!

Note: I am using Robot C 3.08 for the NXT and 2.03 for the RCX