I have written following code to high(bit) at port 0.7 for some time period. and wait for reply on port 0.5.
I know it is not good. Thanks for help
unsigned int get_distance(void)
{
T1CC0H=0x0C; //prepare timer for 10uS pulse
T1CC0L=0xB1;
T1CCTL0 |= 0x04; //1:4 prescale and running
T1IF = 0;
P0_7^=1; // port 0.7 high
while(!T1IF); // wait 10uS
P0_7^=0; // port 0.7 low
T1CTL = 0x00; // stop timer
T1CC0H=0x00 // prepare timer to measure pulse
T1CC0L=0X01; //TMR3L = 0;
T1CCTL0 &= 0x07 // 1:4 prescale but not running yet
T1IF = 0;
while(!P0^5 && !T1IF); // wait for pulse to start (go high)
T1CNTL = 0x01; // start timer to measure pulse
while(P0^5 && !T1IF); // wait for echo pulse to stop (go low)
T1CNTL = 0x00; // stop timer
return ((T1CC0H<<8)+T1CCOL); // contains flight time of the pulse
}
