Preparation:

config-pin P9_22 gpio
config-pin P8_27 pruout

Code:

#include 
#include 
#include "resource_table_empty.h"

// Base address and offset for GPIO0
#define GPIO0           0x44E09000
#define GPIO_DATAIN     0x138       // Offset for reading GPIO data

// Address for GPIO0 data input
#define GPIO0_DATAIN    (GPIO0 + GPIO_DATAIN)

// Pin definitions
#define P9_22           (0x1<<2)    // Mask for input pin P9_22
#define P8_27           (0x1<<8)    // Mask for output pin P8_27

// Declare __R30 as volatile to prevent compiler optimization
volatile register uint32_t __R30;

// Main program
void main(void) {
    // Pointer to GPIO0 data input register
    volatile uint32_t *gpio0in = (volatile uint32_t *)GPIO0_DATAIN;

    uint32_t i = 0;

    // Wiggle output to indicate start
    for(i=0;i<1000;i++) {
        __R30 ^= P8_27;
        __delay_cycles(1000000);
    }

    // Main loop
    while (1) {
        // Toggle the output pin P8_27
        __R30 ^= P8_27;

        // Check if the input pin P9_22 is high
        if (*gpio0in & P9_22) {
            // Perform action if P9_22 is high
            __delay_cycles(100000);   // Short delay
            __R30 ^= P8_27;           // Toggle P8_27 again
        }

        __delay_cycles(1000000);     // Main loop delay
    }
}