From 7adc6c638d91fdc46bca9597d27c8e47a573f0a5 Mon Sep 17 00:00:00 2001
From: rkcf <rkcf@rkcf.me>
Date: Sun, 26 Feb 2023 18:19:17 -0600
Subject: [PATCH] Feat: add basic Wave lookup table export to csv

Refs: #3
---
 src/wave.cpp | 27 ++++++++++++++++++++++++++-
 src/wave.h   |  6 ++++++
 src/wtpp.cpp |  3 +++
 3 files changed, 35 insertions(+), 1 deletion(-)

diff --git a/src/wave.cpp b/src/wave.cpp
index f0e5938..c1fe70d 100644
--- a/src/wave.cpp
+++ b/src/wave.cpp
@@ -1,10 +1,35 @@
 #include "wave.h"
+#include <cstdint>
+#include <string>
+#include <fstream>
+#include <iostream>
 
 // Initialize index at 0 for wave cycles and wave tables
 uint16_t Wave::m_nid = 0;
 
-void Wave::print_head() {
+void Wave::print_head()
+{
   for (uint8_t i = 0; i < 3; i++) {
     std::cout << m_table[i] << '\n';
   }
 }
+
+uint8_t Wave::export_csv(std::string path)
+{
+  // Open file for writing
+  std::ofstream outf{path};
+
+  // Check if we failed to make file
+  if (!outf) {
+    std::cerr << "Failed to write to file\n";
+    return 1;
+  }
+
+  // put values into file
+  for (uint16_t i = 0; i < DEFAULT_N_SAMPLES; i++) {
+    outf << m_table[i] << "\n";
+  }
+
+  // Clean exit
+  return 0;
+}
diff --git a/src/wave.h b/src/wave.h
index de12395..fcbb9db 100644
--- a/src/wave.h
+++ b/src/wave.h
@@ -36,6 +36,12 @@ public:
 
   /*! Prints the first 3 values of sample data */
   void print_head();
+
+  /*! Exports sample table data to csv
+      @param path File path to save to
+      @return uint8_t integer return value for error checking
+   */
+  uint8_t export_csv(std::string path);
 };
 
 #endif // WAVE_H_
diff --git a/src/wtpp.cpp b/src/wtpp.cpp
index bc65bfb..2bef3a8 100644
--- a/src/wtpp.cpp
+++ b/src/wtpp.cpp
@@ -57,5 +57,8 @@ int main()
   Wavetable wt_01{"Fundamental Waves", fundies};
   log(wt_01.name());
 
+  // Write sine wave table to file
+  sin_wave.export_csv("data/sine.csv");
+
   return 0;
 }