From eb6d122bd48705444e48d28720475cad761492a6 Mon Sep 17 00:00:00 2001
From: heck <heck@pep.foundation>
Date: Sun, 6 Aug 2023 15:01:33 +0200
Subject: [PATCH] toggle DAC on timer interrupt

---
 Core/Src/cppmain.cc | 28 +++++++++++++++++++---------
 Core/Src/tim.c      |  2 +-
 2 files changed, 20 insertions(+), 10 deletions(-)

diff --git a/Core/Src/cppmain.cc b/Core/Src/cppmain.cc
index 8d6d1b8..3d4d0b0 100644
--- a/Core/Src/cppmain.cc
+++ b/Core/Src/cppmain.cc
@@ -36,14 +36,14 @@ void log(std::string &&msg)
 // DAC
 // ---
 
-void set_dac_1(uint32_t val)
+void set_dac_1(uint16_t val)
 {
-    HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_L, val);
+    HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_R, val);
 }
 
-void set_dac_2(uint32_t val)
+void set_dac_2(uint16_t val)
 {
-    HAL_DAC_SetValue(&hdac, DAC_CHANNEL_2, DAC_ALIGN_12B_L, val);
+    HAL_DAC_SetValue(&hdac, DAC_CHANNEL_2, DAC_ALIGN_12B_R, val);
 }
 
 
@@ -65,7 +65,15 @@ void led_green_off()
     HAL_GPIO_WritePin(LED_GREEN_GPIO_Port, LED_GREEN_Pin, GPIO_PIN_RESET);
 }
 
-
+void dac1_toggle() {
+    static bool dac_state{ 0 };
+    dac_state = !dac_state;
+    if (dac_state) {
+        set_dac_1(0b0000111111111111);
+    } else {
+        set_dac_1(0b0000000000000000);
+    }
+}
 // MAIN
 // ----
 
@@ -77,10 +85,13 @@ void irq1()
 
 void timer_cb()
 {
+    dac1_toggle();
     led_green_toggle();
     log("timerUP");
 }
 
+// dont forget to start the DAC
+// HAL_DAC_Start(&hdac, DAC_CHANNEL_1);
 void bytebeat()
 {
     HAL_DAC_Start(&hdac, DAC_CHANNEL_1);
@@ -96,11 +107,10 @@ void bytebeat()
 
 void cppmain(void)
 {
+    HAL_DAC_Start(&hdac, DAC_CHANNEL_1);
     HAL_TIM_Base_Start_IT(&htim2);
-    while(true) {
+    while (true) {
         log("huhu");
-        HAL_Delay(2000);
+        HAL_Delay(1000);
     }
-
-
 }
diff --git a/Core/Src/tim.c b/Core/Src/tim.c
index a064ebb..54f255b 100644
--- a/Core/Src/tim.c
+++ b/Core/Src/tim.c
@@ -43,7 +43,7 @@ void MX_TIM2_Init(void)
   htim2.Instance = TIM2;
   htim2.Init.Prescaler = 0;
   htim2.Init.CounterMode = TIM_COUNTERMODE_UP;
-  htim2.Init.Period = 4294967295;
+  htim2.Init.Period = 429400;
   htim2.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
   htim2.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
   if (HAL_TIM_Base_Init(&htim2) != HAL_OK)