Codevision wikipedia
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In the last code I reset recieved_intf No you don't. How are you planning to handle that? Perhaps that was your plan (somehow) with the interrupt?ĭelfindelfin pcbbc All it does is sets recieved_intf, and that variable is never reset anywhere in your code. Remember there are no dumb questions.īut as pointed out on previous thread, you need to think about what happens if there is a protocol error reading from the sensor, or no response at all? Currently your code will lockup in one of the while loops waiting for ever. Why I can't post my whole code and the code indentations?Probably the flipping forum firewall. You don’t seem to have thought about what you are actually trying to achieve with the interrupt? What do you think it is doing for you, or what do you want it to do? Do you not see how that would screw up your pulse width timing or edge detection?Ĥ. An ISR every 100us could easily add 25-50 (12-25us) cycles to either your delay or loop when reading. The overhead of the timer interrupt is slowing down your read function, which is already fairly timing critical. Even if you did reset recieved_intf, you could just as effectively poll the TMR0IF where you currently check recieved_intf for no change of functionality.ģ. So once the interrupt has fired once it can have no further actions on the mainline code (except slow it down).Ģ. All it does is sets recieved_intf, and that variable is never reset anywhere in your code.
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Why is it pointless configuring the timer interrupt?For a number of reasons.ġ. So even if ISR changes flag, mainline will never exit the loop. It will then just not bother with the flag = 0 test (assuming it can never be false, or using the value it read for flag into a register) and just loop forever. While (PORTCbits.RC2 != 1) // Wait until RC2 is highĮlse if(j<32)Because there is no volatile the compiler may look at that, see that flag is set to zero initially and never changed, and then just optimise the while condition away. While (PORTCbits.RC2 != 0) // Wait until RC2 is Low PEIE = 1 // Enable the Peripheral Interrupt
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OPTION_REG = 4 // Timer0 with external freq and 32 as prescalar // Declaring Global Vaiables (Sensor Output) TRISCbits.TRISC2 = 0 // RC5 as Output PIN #pragma config CP = OFF // Flash Program Memory Code Protection bit (Code protection off) #pragma config WRT = OFF // Flash Program Memory Write Enable bits (Write protection off all program memory may be written to by EECON control) #pragma config CPD = OFF // Data EEPROM Memory Code Protection bit (Data EEPROM code protection off)
#CODEVISION WIKIPEDIA SERIAL#
#pragma config LVP = OFF // Low-Voltage (Single-Supply) In-Circuit Serial Programming Enable bit (RB3 is digital I/O, HV on MCLR must be used for programming) #pragma config BOREN = ON // Brown-out Reset Enable bit (BOR enabled) #pragma config PWRTE = OFF // Power-up Timer Enable bit (PWRT disabled) #pragma config WDTE = OFF // Watchdog Timer Enable bit (WDT enabled) #pragma config FOSC = HS // Oscillator Selection bits (HS oscillator)