This code sets up the configuration of the microcontroller and controls the state of an LED based on the state of a switch.
- The PORTB and LATB registers are initialized to 0x00, which sets all the pins on PORTB to be outputs.
- The TRISBbits.TRISB0 and TRISBbits.TRISB7 bits are set so that TRISB0 is set as an output and TRISB7 is set as an input.
- The code then enters an infinite loop.
- Within the loop, it checks the state of the RB7 pin. If the switch is closed (RB7 is low), it sets the RB0 pin high to turn on the LED. If the switch is open (RB7 is high), it sets the RB0 pin low to turn off the LED.
- The loop continues indefinitely, continually checking the state of the switch and updating the LED accordingly.
- The function returns -1, although this is typically not necessary or meaningful in an embedded system.
what does this code do?
int main (void)
{
//Configuration
PORTB = 0x00;
LATB = 0x00;
TRISBbits.TRISB0 = 0;
TRISBbits.TRISB7 = 1;
while(1)
{//infinite loop
if(PORTBbits.RB7 == 0)//if switch is closed
PORTBbits.RB0 = 1; //Led is ON
else
PORTBbits.RB0 = 0; //Led is OFF
}
return -1;
}
1 answer