From 497adda390aa107e68d1f1215cd2d62bac6eec38 Mon Sep 17 00:00:00 2001
From: Jared Boone <jboone@earfeast.com>
Date: Sun, 10 Jan 2016 20:11:05 -0800
Subject: [PATCH] IIR default constructor passes no audio.

Debugging mechanism -- filter must be configured to pass audio.
---
 firmware/baseband/dsp_iir.hpp | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/firmware/baseband/dsp_iir.hpp b/firmware/baseband/dsp_iir.hpp
index 5c36f522..a34a5122 100644
--- a/firmware/baseband/dsp_iir.hpp
+++ b/firmware/baseband/dsp_iir.hpp
@@ -31,9 +31,18 @@ struct iir_biquad_config_t {
 	std::array<float, 3> a;
 };
 
+constexpr iir_biquad_config_t iir_no_pass {
+	{ { 0.0f, 0.0f, 0.0f } },
+	{ { 0.0f, 0.0f, 0.0f } },
+};
+
 class IIRBiquadFilter {
 public:
 	// http://www.musicdsp.org/files/Audio-EQ-Cookbook.txt
+	constexpr IIRBiquadFilter(
+	) : IIRBiquadFilter(iir_no_pass)
+	{
+	}
 
 	// Assume all coefficients are normalized so that a0=1.0
 	constexpr IIRBiquadFilter(