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Build riscvemu on OSX

$ curl -O http://bellard.org/riscvemu/riscvemu-2016-12-20.1.tar.gz
$ tar xfz riscvemu-2016-12-20.1.tar.gz
$ cd riscvemu-2016-12-20.1
$ patch -p0 < ../riscvemu-2016-12-20.1-osx.patch
$ make

Test

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local radio = require('radio')

radio.CompositeBlock():connect(
    radio.RtlSdrSource(88.5e6 - 250e3, 1102500), -- RTL-SDR source, offset-tuned to 88.5 MHz - 250 kHz
    radio.TunerBlock(-250e3, 200e3, 5),          -- Translate -250 kHz, filter 200 kHz, decimate 5
    radio.FrequencyDiscriminatorBlock(1.25),     -- Frequency demodulate with 1.25 modulation index
    radio.LowpassFilterBlock(128, 15e3),         -- Low-pass filter 15 kHz for L+R audio
    radio.FMDeemphasisFilterBlock(75e-6),        -- FM de-emphasis filter with 75 uS time constant
    radio.DownsamplerBlock(5),                   -- Downsample by 5
    radio.PulseAudioSink(1)                      -- Play to system audio with PulseAudio

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local radio = require('radio')

radio.CompositeBlock():connect(
    radio.RtlSdrSource(88.5e6 - 250e3, 1102500), -- RTL-SDR source, offset-tuned to 88.5 MHz - 250 kHz
    radio.TunerBlock(-250e3, 200e3, 5),          -- Translate -250 kHz, filter 200 kHz, decimate 5
    radio.FrequencyDiscriminatorBlock(1.25),     -- Frequency demodulate with 1.25 modulation index
    radio.LowpassFilterBlock(128, 15e3),         -- Low-pass filter 15 kHz for L+R audio
    radio.FMDeemphasisFilterBlock(75e-6),        -- FM de-emphasis filter with 75 uS time constant
    radio.DownsamplerBlock(5),                   -- Downsample by 5
    radio.PulseAudioSink(1)                      -- Play to system audio with PulseAudio

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#define SI5351_PLL_A	0
#define SI5351_PLL_B	1

#define SI5351_MULTISYNTH_DIV_4  4
#define SI5351_MULTISYNTH_DIV_6  6
#define SI5351_MULTISYNTH_DIV_8  8
#define SI5351_R_DIV_1		(0<<4)
#define SI5351_R_DIV_2		(1<<4)
#define SI5351_R_DIV_4		(2<<4)
#define SI5351_R_DIV_8		(3<<4)

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#!/usr/bin/env python
import serial
import numpy as np
import pylab as pl

dev = '/dev/cu.usbmodem401'
ser = serial.Serial(dev)

def fetch_data():
    ser.write("data 0\r")

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#!/usr/bin/env python
#
# RTL FM Receiver - Python based realtime RF signal processing experiment
#  @edy555 2016
# requirement: numpy, scipy, pyaudio, pyrtlsdr

import numpy as np
import scipy.signal
import array
import rtlsdr

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