From c8968da343bedced90ba7e1a56e3ba7ee62172cc Mon Sep 17 00:00:00 2001
From: Dominic Clifton <dominic.clifton@cleanflight.com>
Date: Thu, 9 May 2019 15:03:31 +0900
Subject: [PATCH] [H7] Add PID-Audio support

---
 src/main/drivers/audio_stm32h7xx.c | 90 ++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 src/main/drivers/audio_stm32h7xx.c

diff --git a/src/main/drivers/audio_stm32h7xx.c b/src/main/drivers/audio_stm32h7xx.c
new file mode 100644
index 000000000..f184bb603
--- /dev/null
+++ b/src/main/drivers/audio_stm32h7xx.c
@@ -0,0 +1,90 @@
+/*
+ * This file is part of Cleanflight and Betaflight.
+ *
+ * Cleanflight and Betaflight are free software. You can redistribute
+ * this software and/or modify this software under the terms of the
+ * GNU General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * Cleanflight and Betaflight are distributed in the hope that they
+ * will be useful, but WITHOUT ANY WARRANTY; without even the implied
+ * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ * See the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this software.
+ *
+ * If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <stdbool.h>
+#include <stdint.h>
+#include <math.h>
+
+#include "platform.h"
+
+#include "common/maths.h"
+
+#include "drivers/audio.h"
+
+static DAC_HandleTypeDef hdac;
+static TIM_HandleTypeDef handle;
+static DAC_ChannelConfTypeDef sConfig;
+
+void audioSetupIO(void)
+{
+    __HAL_RCC_DAC12_CLK_ENABLE();
+    __HAL_RCC_TIM6_CLK_ENABLE();
+
+    hdac.Instance = DAC1;
+    HAL_DAC_Init(&hdac);
+
+    GPIO_InitTypeDef GPIO_InitStruct;
+    GPIO_InitStruct.Pin = GPIO_PIN_4;
+    GPIO_InitStruct.Mode = GPIO_MODE_ANALOG;
+    GPIO_InitStruct.Pull = GPIO_NOPULL;
+    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
+}
+
+void audioGenerateWhiteNoise(void)
+{
+    handle.Instance = TIM6;
+    handle.Init.Period = 0xFF;
+    handle.Init.Prescaler = 0;
+
+    handle.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
+    handle.Init.CounterMode = TIM_COUNTERMODE_UP;
+    handle.Init.RepetitionCounter = 0;
+    HAL_TIM_Base_Init(&handle);
+
+    TIM_MasterConfigTypeDef sMasterConfig;
+    sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_ENABLE;
+    sMasterConfig.MasterOutputTrigger = TIM_TRGO_UPDATE;
+    HAL_TIMEx_MasterConfigSynchronization(&handle, &sMasterConfig);
+
+    HAL_TIM_Base_Start(&handle);
+
+    sConfig.DAC_Trigger = DAC_TRIGGER_T6_TRGO;
+    sConfig.DAC_OutputBuffer = DAC_OUTPUTBUFFER_ENABLE;
+    HAL_DAC_ConfigChannel(&hdac, &sConfig, DAC_CHANNEL_1);
+
+    HAL_DACEx_NoiseWaveGenerate(&hdac, DAC_CHANNEL_1, DAC_LFSRUNMASK_BITS10_0);
+    HAL_DAC_SetValue(&hdac, DAC_CHANNEL_1, DAC_ALIGN_12B_L, 0xcd00);
+
+    HAL_DAC_Start(&hdac, DAC_CHANNEL_1);
+}
+
+#define TONE_SPREAD 8
+
+void audioPlayTone(uint8_t tone)
+{
+    handle.Init.Period = 64 + (MAX(TONE_MIN,MIN(tone, TONE_MAX)) * TONE_SPREAD);
+    TIM_Base_SetConfig(handle.Instance, &handle.Init);
+}
+
+void audioSilence(void)
+{
+    HAL_DAC_Stop(&hdac, DAC_CHANNEL_1);
+    HAL_TIM_Base_Stop(&handle);
+}