from machine import Pin, SPI
import struct
import time
import utime

spi = SPI(0, baudrate=1000000, polarity=0, phase=0, sck=Pin(2), mosi=Pin(3), miso=Pin(4))
cs_pin = Pin(5, Pin.OUT)
cs_pin.high()

def send_data(data):
    cs_pin.low()
    utime.sleep_us(1000)
    # Send length of data
    spi.write(struct.pack('H', len(data)))  # 'H' for unsigned short, change depending on max data length
    # Send the actual data
    spi.write(data)
    cs_pin.high()
    utime.sleep_us(1000)

data_to_send = b"Hello from Pico"

while True:
    send_data(data_to_send)
    time.sleep(1)