Stepper motor isn't running with Raspberry pi 4 and drv8825

Question

I am trying to use a Raspberry Pi 4 with a Nima 17 stepper motor using the DRV8825 driver. The motor has 200 steps per revolution, and I am using the following code:

from time import sleep
import RPi.GPIO as GPIO

DIR = 19   # Direction GPIO Pin
STEP = 26  # Step GPIO Pin
CW = 1     # Clockwise Rotation
CCW = 0    # Counterclockwise Rotation
SPR = 200   # Steps per Revolution (360 / 7.5)

GPIO.setmode(GPIO.BCM)
GPIO.setup(DIR, GPIO.OUT)
GPIO.setup(STEP, GPIO.OUT)
GPIO.output(DIR, CW)

step_count = SPR
delay = 0.005

for x in range(step_count):
    GPIO.output(STEP, GPIO.HIGH)
    sleep(delay)
    print('rot')
    GPIO.output(STEP, GPIO.LOW)
    print('stop')
    sleep(delay)

sleep(.5)
GPIO.output(DIR, CCW)
for x in range(step_count):
    GPIO.output(STEP, GPIO.HIGH)
    print('rot-')
    sleep(delay)
    GPIO.output(STEP, GPIO.LOW)
    print('stop-')
    sleep(delay)

GPIO.cleanup()

However, the motor keeps vibrating in both directions and won't work at all. I verified the direction is correct, and I am following the schematic shown below:

I am not currently connecting the m0, m1, m2 pins.