Press the button to turn on the led (arm Series)

Press the button to turn on the led (arm Series)-Linux general technology-Linux technology and application information. The following is a detailed description. Int key_led_test ()
{
Int brkcond = 1;
Unsigned long dwDat = 0xff;
Char quitchar;

GPBCON = GPB5_out | GPB6_out | GPB7_out | GPB8_out; // four pins corresponding to the LED1-LED4 are set as output
GPFCON = GPF4_in & GPF2_in & GPFCON in & GPF0_in; // The four pins corresponding to the K1-K4 are set as input

While (brkcond)
{
DwDat = GPFDAT; // read The GPF pin level status

If (dwDat & (1 <4) // K2 is not pressed
GPBDAT | = (1 <6); // disable LED1
Else
GPBDAT & = ~ (1 <6); // LED1 light up

If (dwDat & (1 <2) // K3 is not pressed
GPBDAT | = (1 <7); // extinguish LED2
Else
GPBDAT & = ~ (1 <7); // LED2 light up

If (dwDat & (1 <1) // K1 is not pressed
GPBDAT | = (1 <5); // disable LED3
Else
GPBDAT & = ~ (1 <5); // LED3 light up

If (dwDat & (1 <0) // K4 is not pressed
GPBDAT | = (1 <8); // disable LED4
Else
GPBDAT & = ~ (1 <8); // LED4 light up

// If (quitchar = get_c () = 0x1b) // calling get_c will block the program
// Brkcond = 0;
}
}


In this program, if you try to call the get_c of the serial port to obtain whether the user presses the 'esc 'key, the program will be blocked. Therefore, to exit the program, you need to use other methods.
If the marked part is added, press the button and the platform's led will not be bright.
I encountered this problem during debugging and shared it with you!