CCS: RaspberryPi code corresponding to sapislave.c of MSP432P401R

Tool/software: Code Composer Studio

I wanted to do spi communication between Raspberry Pi and MSP432,

so I wrote the code for Raspberry Pi with reference to "http://dev.ti.com/tirex/explore/node?node=AGUJ2FnNnpbgXwL6N6ofww__z-lQYNj__LATEST".

import spidev
import RPi.GPIO as GPIO
from time import sleep

MASTER_READY_PIN = 18
SLAVE_READY_PIN = 16    

# inititalize the ports / pins
GPIO.setmode(GPIO.BOARD)
GPIO.setup(SLAVE_READY_PIN, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)   
GPIO.setup(MASTER_READY_PIN, GPIO.OUT)

    # Handshake with the MCU
while (GPIO.input(SLAVE_READY_PIN) == GPIO.LOW):
        sleep(0.1)            
GPIO.output(MASTER_READY_PIN, GPIO.HIGH)

spi = spidev.SpiDev()
spi.open(0, 0)
spi.max_speed_hz = 1000
spi.bits_per_word = 8
spi.mode = 0b01

GPIO.output(MASTER_READY_PIN, GPIO.LOW)

    # Begin communication
MAX_LOOP = 10;
try:
        while MAX_LOOP != 0:
                if (GPIO.input(SLAVE_READY_PIN) is GPIO.LOW):
                        read = bytes(spi.readbytes(30))
                        print(''.join(read.decode()))
                        MAX_LOOP = MAX_LOOP - 1
                        while (GPIO.input(SLAVE_READY_PIN)==GPIO.LOW):
                            sleep(0.1)                            
        GPIO.output(MASTER_READY_PIN, GPIO.LOW)
                        
except KeyboardInterrupt:
            GPIO.output(MASTER_READY_PIN, GPIO.LOW)

But spislave.c
sem_wait (& slaveSem);
It becomes an infinite loop.
Please let me know if you know anything.

Thank you.