Responding to "torsi" on Thread " In Work: mlab / mcc variable usage problems."

  1. 9 years ago


    15 Jun 2007 Albany, Oregon, USA, North Wes...


    If you look down at the comment with your name on it you will get a description of the problem. Basically if I attempt to update the s_elapsed
    or s_loop variables the initial value do not seem to be zero when loop starts


    void User_Autonomous_Code(void) { /* Initialize all PWMs and Relays when entering Autonomous mode, or else it will be stuck with the last values mapped from the joysticks. Remember, even when Disabled it is reading inputs from the Operator Interface. */ pwm01 = pwm02 = pwm03 = pwm04 = 127; pwm05 = pwm06 = pwm07 = pwm08 = 127; pwm09 = pwm10 = pwm11 = pwm12 = 127; s_elapsed = 0UL; s_loop = 0UL; s_elapsed_start = 0UL; #ifdef ZI_MAIN_LOOP_LOGGING printf("entering autonomous mode loop(%04X): %d elapsed(%04X): %d\r", (char*)&s_loop, s_loop, (char*)&s_elapsed, s_elapsed); #endif while (autonomous_mode) /* DO NOT CHANGE! */ { if (statusflag.NEW_SPI_DATA) /* 18.5ms loop area */ { Getdata(&rxdata); /* DO NOT DELETE, or you will be stuck here forever! */ #ifdef ZI_MAIN_LOOP_LOGGING printf("completed getdata loop(%06X): %d elapsed(%06X): %d\r", (char*)&s_loop, s_loop, (char*)&s_elapsed, s_elapsed); #endif #ifndef ZI_HANDLE_ENCODER_TICKS HandleEncoderTicks(); #endif #ifdef ZI_MAIN_LOOP_LOGGING printf("prior to putdata loop(%06X): %d elapsed(%06X): %d\r", (char*)&s_loop, s_loop, (char*)&s_elapsed, s_elapsed); #endif Putdata(&txdata); /* DO NOT DELETE, or you will get no PWM outputs! */ #ifdef ZI_MAIN_LOOP_LOGGING printf("completed putdata loop(%06X): %d elapsed(%06X): %d\r",(char*)&s_loop, s_loop, (char*)&s_elapsed, s_elapsed); #endif PrintWord(s_loop); PrintWord(s_elapsed); // Ricky: If I include these line in the code the initial values of // of s_elapsed and s_loop do not seem to be zero from the // logging. But if I comment these lines out compile and run the // values do seem to be zero from the logging output. s_elapsed = s_elapsed + 18UL; s_loop++; } } }

    First: The printf() support on the Vex is limited it what it can handle for data values.. Float and Double (Float) are not supported.

    Second: IIRC you would need to modify your
    printf() formatting for long ints, by adding the 'l' to your '%x' format.

    Third: printf() does not expect the '&' in front of each variable. You are going to be "passing" the Memory Location of each of your variables to the printf() function, not the Value of each of your variables.


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