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/**
******************************************************************************
* @file SAI/SAI_AudioPlay/Src/main.c
* @author MCD Application Team
* @brief This example describes how to use SAI HAL API to realize
* audio play.
******************************************************************************
* @attention
*
* Copyright (c) 2017 STMicroelectronics.
* All rights reserved.
*
* This software is licensed under terms that can be found in the LICENSE file
* in the root directory of this software component.
* If no LICENSE file comes with this software, it is provided AS-IS.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/** @addtogroup STM32F4xx_HAL_Examples
* @{
*/
/** @addtogroup DFSDM_AudioRecord
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
#define AUDIO_FILE_ADDRESS 0x08010000
#define AUDIO_FILE_SIZE (180*1024)
#define PLAY_HEADER 0x2C
#define PLAY_BUFF_SIZE 4096
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
SAI_HandleTypeDef SaiHandle;
DMA_HandleTypeDef hSaiDma;
AUDIO_DrvTypeDef *audio_drv;
uint16_t PlayBuff[PLAY_BUFF_SIZE];
__IO int16_t UpdatePointer = -1;
/* Private function prototypes -----------------------------------------------*/
static void SystemClock_Config(void);
static void Playback_Init(void);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
int main(void)
{
uint32_t PlaybackPosition = PLAY_BUFF_SIZE + PLAY_HEADER;
/* STM32F4xx HAL library initialization:
- Configure the Flash prefetch, instruction and Data caches
- Systick timer is configured by default as source of time base, but user
can eventually implement his proper time base source (a general purpose
timer for example or other time source), keeping in mind that Time base
duration should be kept 1ms since PPP_TIMEOUT_VALUEs are defined and
handled in milliseconds basis.
- Set NVIC Group Priority to 4
- Low Level Initialization: global MSP (MCU Support Package) initialization
*/
HAL_Init();
/* Configure the system clock to have a frequency of 180 MHz */
SystemClock_Config();
/* Configure LED3 */
BSP_LED_Init(LED3);
/* Check if the buffer has been loaded in flash */
if(*((uint64_t *)AUDIO_FILE_ADDRESS) != 0x017EFE2446464952 ) Error_Handler();
/* Initialize playback */
Playback_Init();
/* Initialize the data buffer */
for(int i=0; i < PLAY_BUFF_SIZE; i+=2)
{
PlayBuff[i]=*((__IO uint16_t *)(AUDIO_FILE_ADDRESS + PLAY_HEADER + i));
}
/* Start the playback */
if(0 != audio_drv->Play(AUDIO_I2C_ADDRESS, NULL, 0))
{
Error_Handler();
}
if(HAL_OK != HAL_SAI_Transmit_DMA(&SaiHandle, (uint8_t *) PlayBuff, PLAY_BUFF_SIZE))
{
Error_Handler();
}
/* Start loopback */
while(1)
{
BSP_LED_Toggle(LED3);
/* Wait a callback event */
while(UpdatePointer==-1);
int position = UpdatePointer;
UpdatePointer = -1;
/* Update the first or the second part of the buffer */
for(int i = 0; i < PLAY_BUFF_SIZE/2; i++)
{
PlayBuff[i+position] = *(uint16_t *)(AUDIO_FILE_ADDRESS + PlaybackPosition);
PlaybackPosition+=2;
}
/* check the end of the file */
if((PlaybackPosition+PLAY_BUFF_SIZE/2) > AUDIO_FILE_SIZE)
{
PlaybackPosition = PLAY_HEADER;
}
if(UpdatePointer != -1)
{
/* Buffer update time is too long compare to the data transfer time */
Error_Handler();
}
}
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow :
* System Clock source = PLL (HSE)
* SYSCLK(Hz) = 180000000
* HCLK(Hz) = 180000000
* AHB Prescaler = 1
* APB1 Prescaler = 4
* APB2 Prescaler = 2
* HSE Frequency(Hz) = 8000000
* PLL_M = 8
* PLL_N = 360
* PLL_P = 2
* PLL_Q = 7
* VDD(V) = 3.3
* Main regulator output voltage = Scale1 mode
* Flash Latency(WS) = 5
* @param None
* @retval None
*/
static void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_OscInitTypeDef RCC_OscInitStruct;
HAL_StatusTypeDef ret = HAL_OK;
/* Enable Power Control clock */
__HAL_RCC_PWR_CLK_ENABLE();
/* The voltage scaling allows optimizing the power consumption when the device is
clocked below the maximum system frequency, to update the voltage scaling value
regarding system frequency refer to product datasheet. */
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
/* Enable HSE Oscillator and activate PLL with HSE as source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
RCC_OscInitStruct.HSEState = RCC_HSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
RCC_OscInitStruct.PLL.PLLM = 8;
RCC_OscInitStruct.PLL.PLLN = 360;
RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
RCC_OscInitStruct.PLL.PLLQ = 7;
RCC_OscInitStruct.PLL.PLLR = 2;
ret = HAL_RCC_OscConfig(&RCC_OscInitStruct);
if(ret != HAL_OK)
{
while(1) { ; }
}
/* Activate the OverDrive to reach the 180 MHz Frequency */
ret = HAL_PWREx_EnableOverDrive();
if(ret != HAL_OK)
{
while(1) { ; }
}
/* Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
ret = HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_5);
if(ret != HAL_OK)
{
while(1) { ; }
}
}
/**
* @brief Playback initialization
* @param None
* @retval None
*/
static void Playback_Init(void)
{
RCC_PeriphCLKInitTypeDef RCC_PeriphCLKInitStruct;
/* Configure PLLSAI prescalers */
/* PLLSAI_VCO: VCO_429M
SAI_CLK(first level) = PLLSAI_VCO/PLLSAIQ = 429/2 = 214.5 Mhz
SAI_CLK_x = SAI_CLK(first level)/PLLSAIDIVQ = 214.5/19 = 11.289 Mhz */
RCC_PeriphCLKInitStruct.PeriphClockSelection = RCC_PERIPHCLK_SAI2;
RCC_PeriphCLKInitStruct.Sai2ClockSelection = RCC_SAI2CLKSOURCE_PLLSAI;
RCC_PeriphCLKInitStruct.PLLSAI.PLLSAIM = 8;
RCC_PeriphCLKInitStruct.PLLSAI.PLLSAIN = 429;
RCC_PeriphCLKInitStruct.PLLSAI.PLLSAIQ = 2;
RCC_PeriphCLKInitStruct.PLLSAIDivQ = 19;
if(HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphCLKInitStruct) != HAL_OK)
{
Error_Handler();
}
/* Initialize SAI */
__HAL_SAI_RESET_HANDLE_STATE(&SaiHandle);
SaiHandle.Instance = AUDIO_SAIx;
__HAL_SAI_DISABLE(&SaiHandle);
SaiHandle.Init.AudioMode = SAI_MODEMASTER_TX;
SaiHandle.Init.Synchro = SAI_ASYNCHRONOUS;
SaiHandle.Init.OutputDrive = SAI_OUTPUTDRIVE_ENABLE;
SaiHandle.Init.NoDivider = SAI_MASTERDIVIDER_ENABLE;
SaiHandle.Init.FIFOThreshold = SAI_FIFOTHRESHOLD_1QF;
SaiHandle.Init.ClockSource = SAI_CLKSOURCE_PLLSAI;
SaiHandle.Init.AudioFrequency = SAI_AUDIO_FREQUENCY_22K;
SaiHandle.Init.Protocol = SAI_FREE_PROTOCOL;
SaiHandle.Init.DataSize = SAI_DATASIZE_16;
SaiHandle.Init.FirstBit = SAI_FIRSTBIT_MSB;
SaiHandle.Init.ClockStrobing = SAI_CLOCKSTROBING_RISINGEDGE;
SaiHandle.FrameInit.FrameLength = 32;
SaiHandle.FrameInit.ActiveFrameLength = 16;
SaiHandle.FrameInit.FSDefinition = SAI_FS_CHANNEL_IDENTIFICATION;
SaiHandle.FrameInit.FSPolarity = SAI_FS_ACTIVE_LOW;
SaiHandle.FrameInit.FSOffset = SAI_FS_BEFOREFIRSTBIT;
SaiHandle.SlotInit.FirstBitOffset = 0;
SaiHandle.SlotInit.SlotSize = SAI_SLOTSIZE_DATASIZE;
SaiHandle.SlotInit.SlotNumber = 2;
SaiHandle.SlotInit.SlotActive = (SAI_SLOTACTIVE_0 | SAI_SLOTACTIVE_1);
if(HAL_OK != HAL_SAI_Init(&SaiHandle))
{
Error_Handler();
}
/* Enable SAI to generate clock used by audio driver */
__HAL_SAI_ENABLE(&SaiHandle);
/* Initialize audio driver */
if(WM8994_ID != wm8994_drv.ReadID(AUDIO_I2C_ADDRESS))
{
Error_Handler();
}
audio_drv = &wm8994_drv;
audio_drv->Reset(AUDIO_I2C_ADDRESS);
if(0 != audio_drv->Init(AUDIO_I2C_ADDRESS, OUTPUT_DEVICE_HEADPHONE, 20, AUDIO_FREQUENCY_22K))
{
Error_Handler();
}
}
/**
* @brief This function is executed in case of error occurrence.
* @param None
* @retval None
*/
void Error_Handler(void)
{
/* LED3 On in error case */
BSP_LED_On(LED3);
while (1)
{
HAL_Delay(1000);
}
}
/**
* @brief SAI MSP Init.
* @param hsai : pointer to a SAI_HandleTypeDef structure that contains
* the configuration information for SAI module.
* @retval None
*/
void HAL_SAI_MspInit(SAI_HandleTypeDef *hsai)
{
GPIO_InitTypeDef GPIO_Init;
/* Enable SAI2 clock */
__HAL_RCC_SAI2_CLK_ENABLE();
/* Configure GPIOs used for SAI2 */
AUDIO_SAIx_MCLK_ENABLE();
AUDIO_SAIx_SCK_ENABLE();
AUDIO_SAIx_FS_ENABLE();
AUDIO_SAIx_SD_ENABLE();
GPIO_Init.Mode = GPIO_MODE_AF_PP;
GPIO_Init.Pull = GPIO_NOPULL;
GPIO_Init.Speed = GPIO_SPEED_HIGH;
GPIO_Init.Alternate = AUDIO_SAIx_FS_AF;
GPIO_Init.Pin = AUDIO_SAIx_FS_PIN;
HAL_GPIO_Init(AUDIO_SAIx_FS_GPIO_PORT, &GPIO_Init);
GPIO_Init.Alternate = AUDIO_SAIx_SCK_AF;
GPIO_Init.Pin = AUDIO_SAIx_SCK_PIN;
HAL_GPIO_Init(AUDIO_SAIx_SCK_GPIO_PORT, &GPIO_Init);
GPIO_Init.Alternate = AUDIO_SAIx_SD_AF;
GPIO_Init.Pin = AUDIO_SAIx_SD_PIN;
HAL_GPIO_Init(AUDIO_SAIx_SD_GPIO_PORT, &GPIO_Init);
GPIO_Init.Alternate = AUDIO_SAIx_MCLK_AF;
GPIO_Init.Pin = AUDIO_SAIx_MCLK_PIN;
HAL_GPIO_Init(AUDIO_SAIx_MCLK_GPIO_PORT, &GPIO_Init);
/* Configure DMA used for SAI2 */
__HAL_RCC_DMA2_CLK_ENABLE();
if(hsai->Instance == AUDIO_SAIx)
{
hSaiDma.Init.Channel = DMA_CHANNEL_3;
hSaiDma.Init.Direction = DMA_MEMORY_TO_PERIPH;
hSaiDma.Init.PeriphInc = DMA_PINC_DISABLE;
hSaiDma.Init.MemInc = DMA_MINC_ENABLE;
hSaiDma.Init.PeriphDataAlignment = DMA_PDATAALIGN_HALFWORD;
hSaiDma.Init.MemDataAlignment = DMA_MDATAALIGN_HALFWORD;
hSaiDma.Init.Mode = DMA_CIRCULAR;
hSaiDma.Init.Priority = DMA_PRIORITY_HIGH;
hSaiDma.Init.FIFOMode = DMA_FIFOMODE_ENABLE;
hSaiDma.Init.FIFOThreshold = DMA_FIFO_THRESHOLD_FULL;
hSaiDma.Init.MemBurst = DMA_MBURST_SINGLE;
hSaiDma.Init.PeriphBurst = DMA_PBURST_SINGLE;
/* Select the DMA instance to be used for the transfer : DMA2_Stream6 */
hSaiDma.Instance = DMA2_Stream6;
/* Associate the DMA handle */
__HAL_LINKDMA(hsai, hdmatx, hSaiDma);
/* Deinitialize the Stream for new transfer */
HAL_DMA_DeInit(&hSaiDma);
/* Configure the DMA Stream */
if (HAL_OK != HAL_DMA_Init(&hSaiDma))
{
Error_Handler();
}
}
HAL_NVIC_SetPriority(DMA2_Stream6_IRQn, 0x01, 0);
HAL_NVIC_EnableIRQ(DMA2_Stream6_IRQn);
}
/**
* @brief Tx Transfer completed callbacks.
* @param hsai : pointer to a SAI_HandleTypeDef structure that contains
* the configuration information for SAI module.
* @retval None
*/
void HAL_SAI_TxCpltCallback(SAI_HandleTypeDef *hsai)
{
/* NOTE : This function Should not be modified, when the callback is needed,
the HAL_SAI_TxCpltCallback could be implemented in the user file
*/
UpdatePointer = PLAY_BUFF_SIZE/2;
}
/**
* @brief Tx Transfer Half completed callbacks
* @param hsai : pointer to a SAI_HandleTypeDef structure that contains
* the configuration information for SAI module.
* @retval None
*/
void HAL_SAI_TxHalfCpltCallback(SAI_HandleTypeDef *hsai)
{
/* NOTE : This function Should not be modified, when the callback is needed,
the HAL_SAI_TxHalfCpltCallback could be implenetd in the user file
*/
UpdatePointer = 0;
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */
/* Infinite loop */
while (1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
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