From 7adea8d39c6d8126339efb60b626125df4cae444 Mon Sep 17 00:00:00 2001
From: heck <heck@pep.foundation>
Date: Wed, 5 Jul 2023 21:32:43 +0200
Subject: [PATCH] BYTEBEAT BYTEBEAT BYTEBEAT \o/ \o/ \o/

http://countercomplex.blogspot.com/2011/10/algorithmic-symphonies-from-one-line-of.html
---
 Core/Src/cppmain.cc | 31 ++++++++++++++++++-------------
 1 file changed, 18 insertions(+), 13 deletions(-)

diff --git a/Core/Src/cppmain.cc b/Core/Src/cppmain.cc
index 868838e..39795ac 100644
--- a/Core/Src/cppmain.cc
+++ b/Core/Src/cppmain.cc
@@ -8,9 +8,11 @@
 #include "cppmain.h"
 #include "main.h"
 #include "usbd_cdc_if.h"
+#include "dac.h"
 #include <cmath>
 #include <functional>
 #include <iostream>
+#include "limits"
 
 const double pi{ std::acos(-1) };
 
@@ -26,22 +28,25 @@ void log(std::string &&msg)
     log(msg);
 }
 
-std::function<void()> printheck = [] { log("heck"); };
+void set_dac_1(uint32_t val)
+{
+    HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_L, val);
+}
+
+void set_dac_2(uint32_t val)
+{
+    HAL_DAC_SetValue(&hdac, DAC_CHANNEL_2, DAC_ALIGN_12B_L, val);
+}
 
 void cppmain(void)
 {
-    log(pi);
-    long i{ 0 };
+    HAL_DAC_Start(&hdac, DAC_CHANNEL_1);
+    long t{ 0 };
     while (true) {
-        const float piwrap{ std::fmod(float(i / 100.), float(2. * pi)) };
-        const float sin_factor = std::abs(float(sin(piwrap)));
-
-        HAL_Delay(static_cast<int>(sin_factor * 100.0));
-
-        HAL_GPIO_TogglePin(LED_GREEN_GPIO_Port, LED_GREEN_Pin);
-        log({ "hello heck:" + std::to_string(i) + " piwrap:" + std::to_string(piwrap) +
-              " fact:" + std::to_string(sin_factor) });
-        printheck();
-        i++;
+        unsigned char res = t * ((t >> 12 | t >> 8) & 63 & t >> 4);
+        set_dac_1((res % 256) * 100);
+        for (int g = 0; g < 6000; g++) {}
+        t++;
+        t %= (std::numeric_limits<long>::max() - 1);
     }
 }