"""P9-4 Generate a sine wave using MCP4725 on I2C Bus"""
from machine import Pin, I2C

i2c = I2C(1, scl = Pin(27), sda = Pin(26), freq = 400_000)

DEV_ADDR = 0x60
sinewave = (2048, 3071, 3821, 4095, 3821, 3071, 2048, 1024, 274, 0, 274, 1024, 2048)

while True:
    for d in sinewave:
        # Create a bytearray of DAC command, high byte (D11-D4), low byte (D3-D0)
        ba = bytearray([0x40, (d >> 4) & 0xFF, (d << 4) & 0xF0])
        # Write the bytearray to MCP4725 DAC through I2C
        i2c.writeto(DEV_ADDR, ba)