From 2f60747dd3b51321903de9c51789765d41ed83e4 Mon Sep 17 00:00:00 2001
From: ozpv <39195175+ozpv@users.noreply.github.com>
Date: Mon, 17 Aug 2026 00:01:22 -0500
Subject: audio driver

---
 Core/Src/sai.c | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 51 insertions(+), 3 deletions(-)

(limited to 'Core/Src/sai.c')

diff --git a/Core/Src/sai.c b/Core/Src/sai.c
index 9bd58d9..9601fc8 100755
--- a/Core/Src/sai.c
+++ b/Core/Src/sai.c
@@ -27,6 +27,8 @@
 
 SAI_HandleTypeDef hsai_BlockA1;
 SAI_HandleTypeDef hsai_BlockB1;
+DMA_HandleTypeDef hdma_sai1_b;
+DMA_HandleTypeDef hdma_sai1_a;
 
 /* SAI1 init function */
 void MX_SAI1_Init(void)
@@ -51,7 +53,7 @@ void MX_SAI1_Init(void)
   hsai_BlockA1.Init.NoDivider = SAI_MCK_OVERSAMPLING_DISABLE;
   hsai_BlockA1.Init.MckOverSampling = SAI_MCK_OVERSAMPLING_DISABLE;
   hsai_BlockA1.Init.FIFOThreshold = SAI_FIFOTHRESHOLD_EMPTY;
-  hsai_BlockA1.Init.AudioFrequency = SAI_AUDIO_FREQUENCY_192K;
+  hsai_BlockA1.Init.AudioFrequency = SAI_AUDIO_FREQUENCY_48K;
   hsai_BlockA1.Init.SynchroExt = SAI_SYNCEXT_DISABLE;
   hsai_BlockA1.Init.MonoStereoMode = SAI_STEREOMODE;
   hsai_BlockA1.Init.CompandingMode = SAI_NOCOMPANDING;
@@ -104,10 +106,31 @@ void HAL_SAI_MspInit(SAI_HandleTypeDef* saiHandle)
     GPIO_InitStruct.Pin = GPIO_PIN_2|GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6;
     GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
     GPIO_InitStruct.Pull = GPIO_NOPULL;
-    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
     GPIO_InitStruct.Alternate = GPIO_AF6_SAI1;
     HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
 
+    /* Peripheral DMA init*/
+
+    hdma_sai1_a.Instance = DMA1_Stream1;
+    hdma_sai1_a.Init.Request = DMA_REQUEST_SAI1_A;
+    hdma_sai1_a.Init.Direction = DMA_MEMORY_TO_PERIPH;
+    hdma_sai1_a.Init.PeriphInc = DMA_PINC_DISABLE;
+    hdma_sai1_a.Init.MemInc = DMA_MINC_ENABLE;
+    hdma_sai1_a.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
+    hdma_sai1_a.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
+    hdma_sai1_a.Init.Mode = DMA_CIRCULAR;
+    hdma_sai1_a.Init.Priority = DMA_PRIORITY_HIGH;
+    hdma_sai1_a.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
+    if (HAL_DMA_Init(&hdma_sai1_a) != HAL_OK)
+    {
+      Error_Handler();
+    }
+
+    /* Several peripheral DMA handle pointers point to the same DMA handle.
+     Be aware that there is only one channel to perform all the requested DMAs. */
+    __HAL_LINKDMA(saiHandle,hdmarx,hdma_sai1_a);
+    __HAL_LINKDMA(saiHandle,hdmatx,hdma_sai1_a);
     }
     if(saiHandle->Instance==SAI1_Block_B)
     {
@@ -124,10 +147,31 @@ void HAL_SAI_MspInit(SAI_HandleTypeDef* saiHandle)
     GPIO_InitStruct.Pin = GPIO_PIN_3;
     GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
     GPIO_InitStruct.Pull = GPIO_NOPULL;
-    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
+    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
     GPIO_InitStruct.Alternate = GPIO_AF6_SAI1;
     HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
 
+    /* Peripheral DMA init*/
+
+    hdma_sai1_b.Instance = DMA1_Stream0;
+    hdma_sai1_b.Init.Request = DMA_REQUEST_SAI1_B;
+    hdma_sai1_b.Init.Direction = DMA_PERIPH_TO_MEMORY;
+    hdma_sai1_b.Init.PeriphInc = DMA_PINC_DISABLE;
+    hdma_sai1_b.Init.MemInc = DMA_MINC_ENABLE;
+    hdma_sai1_b.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
+    hdma_sai1_b.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
+    hdma_sai1_b.Init.Mode = DMA_CIRCULAR;
+    hdma_sai1_b.Init.Priority = DMA_PRIORITY_HIGH;
+    hdma_sai1_b.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
+    if (HAL_DMA_Init(&hdma_sai1_b) != HAL_OK)
+    {
+      Error_Handler();
+    }
+
+    /* Several peripheral DMA handle pointers point to the same DMA handle.
+     Be aware that there is only one channel to perform all the requested DMAs. */
+    __HAL_LINKDMA(saiHandle,hdmarx,hdma_sai1_b);
+    __HAL_LINKDMA(saiHandle,hdmatx,hdma_sai1_b);
     }
 }
 
@@ -152,6 +196,8 @@ void HAL_SAI_MspDeInit(SAI_HandleTypeDef* saiHandle)
     */
     HAL_GPIO_DeInit(GPIOE, GPIO_PIN_2|GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6);
 
+    HAL_DMA_DeInit(saiHandle->hdmarx);
+    HAL_DMA_DeInit(saiHandle->hdmatx);
     }
     if(saiHandle->Instance==SAI1_Block_B)
     {
@@ -167,6 +213,8 @@ void HAL_SAI_MspDeInit(SAI_HandleTypeDef* saiHandle)
     */
     HAL_GPIO_DeInit(GPIOE, GPIO_PIN_3);
 
+    HAL_DMA_DeInit(saiHandle->hdmarx);
+    HAL_DMA_DeInit(saiHandle->hdmatx);
     }
 }
 
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