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problem with loop counter

Nik Martin

I have just switched to KEIL from SDCC (it just wouldn't do what I needed!). I have a startup loop that allows some sleep time while some outboard sensors warm up. While they are doing this, I'm in a loop, printing "."'s to the uart:

Byte i = 0; //loop counter
	printf("Calibrating Sensors");
	for (i=0; i<10; i++){
		toggle_led(1,250); // delay and flash LED
		printf(".");
	}
	printf("Loop Complete \r\n");
	calibrate_sensors();
	delay(3000);
...
The problem is that i is being incremented while the toggle_led() delay routine is running. toggle_led calls delay(ms), which is based is based on a 1ms timer, using timer0's interrupt. Any reason why i is 231 (vs. 2) when delay() returns the first time through the loop?

I'm using 4.51a of cx51.

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  • 0 in reply to John Donaldson

    Is there something I could post that would clear up what problem I was having? My ASM skills are extremely limited, so I made an assumption based on what I saw, and moving the uart interrupt routine over to register bank 2 fixed it.

    I'll be glad to post the .lst files if it helps.

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  • 0 in reply to John Donaldson

    Is there something I could post that would clear up what problem I was having? My ASM skills are extremely limited, so I made an assumption based on what I saw, and moving the uart interrupt routine over to register bank 2 fixed it.

    I'll be glad to post the .lst files if it helps.

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