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STM32 USB AUDIO 基础篇①——通过STM32CubeMX生成USB Speaker音频播放Demo（史上最简单）

發(fā)布時間：2024/3/7 编程问答 23 豆豆

生活随笔收集整理的這篇文章主要介紹了 STM32 USB AUDIO 基础篇①——通过STM32CubeMX生成USB Speaker音频播放Demo（史上最简单）小編覺得挺不錯的,現(xiàn)在分享給大家,幫大家做個參考.

文章目錄

一、硬件原理
二、STM32CubeMX配置
- 2.1 RCC
- 2.2 SYS
- 2.3 I2C1
- 2.4 USART1
- 2.5 USB_OTG_FS
- 2.6 I2S2
- 2.7 USB_DEVICE
- 2.8 Clock Configuration
- 2.9 Project Manager
- 2.10 生成代碼
三、代碼完善
- 3.1 WM8978
- 3.2 usbd_audio_if
四、程序流程圖
- 4.1 初始化流程
- 4.2 播放流程

一、硬件原理

基于正點原子STM32F407探索者開發(fā)板，其中音頻部分硬件原理圖如下

其中WM8978是一款全功能音頻處理器，STM32通過控制WM8978即可實現(xiàn)揚聲器/喇叭的音頻播放，麥克風的音頻錄制等功能。

主要控制兩個接口

IIC控制接口，實現(xiàn)WM8978寄存器的讀寫
I2S數(shù)字音頻接口，實現(xiàn)音頻數(shù)據(jù)傳輸（接收和發(fā)送）

二、STM32CubeMX配置

2.1 RCC

開發(fā)板外接了兩個晶振

8MHz的高速晶振
32.768kHz的低速晶振

2.2 SYS

Debug Serial Wire

2.3 I2C1

GPIO口是PB8/PB9

2.4 USART1

用來打印調(diào)試日志，波特率調(diào)到1000000，加快日志打印
Data Direction: Transmit Only
DMA Settings: USART1_TX
PA9 / PA10

2.5 USB_OTG_FS

Mode:Device Only
global interrupt 勾選

2.6 I2S2

mode: Full-Duplex Master
Audio Frequency: 48KHz
DMA Setting: SPI2_TX / I2S2_EXT_RX
GPIO Setting

2.7 USB_DEVICE

Class For FS IP: Audio Device Class
USBD_AUDIO_FREQ: 48000 sample/s
描述符有些部分可以自定義

2.8 Clock Configuration

2.9 Project Manager

堆棧調(diào)大0x4000

2.10 生成代碼

右上角 GENERATE CODE

三、代碼完善

3.1 WM8978

main.c

main函數(shù)增加WM8978_Init();

int main(void) {HAL_Init();SystemClock_Config();MX_GPIO_Init();MX_DMA_Init();MX_I2C1_Init();MX_I2S2_Init();MX_USART1_UART_Init();MX_USB_DEVICE_Init();WM8978_Init();while (1){} }

wm8978.c

#define DEVICE_ADDRESS 0x1A #define WIRTE_ADDRESS (DEVICE_ADDRESS << 1 | 0)extern I2C_HandleTypeDef hi2c1;uint8_t WM8978_Write(uint8_t reg_addr, uint16_t data) {uint8_t pData[10] = { 0 };pData[0] = (reg_addr << 1) | ((data >> 8) & 0x01);pData[1] = data & 0xFF;return HAL_I2C_Master_Transmit(&hi2c1, WIRTE_ADDRESS, pData, 2, 1000); }uint32_t WM8978_Init(void) {WM8978_Reset();WM8978_Write(1, 0x0F); // 模擬放大器使能，使能輸出輸入緩存區(qū)WM8978_Write(3, 0x7F); // 使能左右聲道和L\ROUT2WM8978_Write(4, 0x10); // I2S 16bitWM8978_Write(6, 0x00); // MCU提供時鐘WM8978_Write(10, 0x08); // 輸出音質最好WM8978_Write(43, 0x10); // ROUT2反相WM8978_VolumeCtl(0x3F);return 0; }uint32_t WM8978_Reset(void) {if(WM8978_Write(0, 0)!= HAL_OK)// 軟復位return 1;HAL_Delay(10);return 0; }

3.2 usbd_audio_if

AUDIO_AudioCmd_FS中對應AUDIO_CMD_START、AUDIO_CMD_PLAY和AUDIO_CMD_STOP的操作
HAL_I2S_TxCpltCallback對應傳輸完成的USB同步操作

extern I2S_HandleTypeDef hi2s2; /*** @brief Handles AUDIO command.* @param pbuf: Pointer to buffer of data to be sent* @param size: Number of data to be sent (in bytes)* @param cmd: Command opcode* @retval USBD_OK if all operations are OK else USBD_FAIL*/ static int8_t AUDIO_AudioCmd_FS(uint8_t* pbuf, uint32_t size, uint8_t cmd) {switch(cmd){case AUDIO_CMD_START:HAL_I2S_Transmit_DMA(&hi2s2, (uint16_t*)pbuf, size);break;case AUDIO_CMD_PLAY:HAL_I2S_Transmit_DMA(&hi2s2, (uint16_t*)pbuf, size);break; case AUDIO_CMD_STOP:HAL_I2S_DMAStop(&hi2s2);break; }return (USBD_OK); }void HAL_I2S_TxHalfCpltCallback(I2S_HandleTypeDef *hi2s) {HalfTransfer_CallBack_FS(); }void HAL_I2S_TxCpltCallback(I2S_HandleTypeDef *hi2s) {TransferComplete_CallBack_FS(); }

四、程序流程圖

4.1 初始化流程

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.edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-Pg3ARxCGXRAfsWjh .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-Pg3ARxCGXRAfsWjh .marker{fill:#333}#mermaid-svg-Pg3ARxCGXRAfsWjh .marker.cross{stroke:#333}:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}#mermaid-svg-Pg3ARxCGXRAfsWjh {color: rgba(0, 0, 0, 0.75);font: ;}mainhal庫stm32f4xx_hal_mapwx8978usb_deviceSTM32_USB_DEVICE_LibraryHAL_Init()SystemClock_Config()HAL_Delay(100)MX_GPIO_Init()MX_DMA_Init()MX_I2C1_Init()HAL_I2C_Init()HAL_I2C_MspInit()MX_I2S2_Init()HAL_I2S_Init()HAL_I2S_MspInit()WM8978_Init()MX_USB_DEVICE_Init()USBD_Init(&hUsbDeviceFS, &FS_Desc, DEVICE_FS)USBD_RegisterClass(&hUsbDeviceFS, &USBD_AUDIO)USBD_AUDIO_RegisterInterface(&hUsbDeviceFS, &USBD_AUDIO_fops_FS)USBD_Start(&hUsbDeviceFS)HAL_Delay(100)while(1)mainhal庫stm32f4xx_hal_mapwx8978usb_deviceSTM32_USB_DEVICE_Library

4.2 播放流程

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text{fill:#9370db;stroke:none;font-size:10px;font-family:'trebuchet ms', verdana, arial;font-family:var(--mermaid-font-family)}#mermaid-svg-MN8Y5XQhAt16b4Dt g.stateGroup text{fill:#9370db;fill:#333;stroke:none;font-size:10px}#mermaid-svg-MN8Y5XQhAt16b4Dt g.statediagram-cluster .cluster-label text{fill:#333}#mermaid-svg-MN8Y5XQhAt16b4Dt g.stateGroup .state-title{font-weight:bolder;fill:#000}#mermaid-svg-MN8Y5XQhAt16b4Dt g.stateGroup rect{fill:#ECECFF;stroke:#9370db}#mermaid-svg-MN8Y5XQhAt16b4Dt g.stateGroup line{stroke:#9370db;stroke-width:1}#mermaid-svg-MN8Y5XQhAt16b4Dt .transition{stroke:#9370db;stroke-width:1;fill:none}#mermaid-svg-MN8Y5XQhAt16b4Dt .stateGroup .composit{fill:white;border-bottom:1px}#mermaid-svg-MN8Y5XQhAt16b4Dt .stateGroup .alt-composit{fill:#e0e0e0;border-bottom:1px}#mermaid-svg-MN8Y5XQhAt16b4Dt .state-note{stroke:#aa3;fill:#fff5ad}#mermaid-svg-MN8Y5XQhAt16b4Dt .state-note text{fill:black;stroke:none;font-size:10px}#mermaid-svg-MN8Y5XQhAt16b4Dt .stateLabel 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.statediagram-cluster.statediagram-cluster-alt .inner{fill:#e0e0e0}#mermaid-svg-MN8Y5XQhAt16b4Dt .statediagram-cluster .inner{rx:0;ry:0}#mermaid-svg-MN8Y5XQhAt16b4Dt .statediagram-state rect.basic{rx:5px;ry:5px}#mermaid-svg-MN8Y5XQhAt16b4Dt .statediagram-state rect.divider{stroke-dasharray:10,10;fill:#efefef}#mermaid-svg-MN8Y5XQhAt16b4Dt .note-edge{stroke-dasharray:5}#mermaid-svg-MN8Y5XQhAt16b4Dt .statediagram-note rect{fill:#fff5ad;stroke:#aa3;stroke-width:1px;rx:0;ry:0}:root{--mermaid-font-family: '"trebuchet ms", verdana, arial';--mermaid-font-family: "Comic Sans MS", "Comic Sans", cursive}#mermaid-svg-MN8Y5XQhAt16b4Dt .error-icon{fill:#522}#mermaid-svg-MN8Y5XQhAt16b4Dt .error-text{fill:#522;stroke:#522}#mermaid-svg-MN8Y5XQhAt16b4Dt .edge-thickness-normal{stroke-width:2px}#mermaid-svg-MN8Y5XQhAt16b4Dt .edge-thickness-thick{stroke-width:3.5px}#mermaid-svg-MN8Y5XQhAt16b4Dt .edge-pattern-solid{stroke-dasharray:0}#mermaid-svg-MN8Y5XQhAt16b4Dt .edge-pattern-dashed{stroke-dasharray:3}#mermaid-svg-MN8Y5XQhAt16b4Dt .edge-pattern-dotted{stroke-dasharray:2}#mermaid-svg-MN8Y5XQhAt16b4Dt .marker{fill:#333}#mermaid-svg-MN8Y5XQhAt16b4Dt .marker.cross{stroke:#333}:root { --mermaid-font-family: "trebuchet ms", verdana, arial;}#mermaid-svg-MN8Y5XQhAt16b4Dt {color: rgba(0, 0, 0, 0.75);font: ;}STM32_USB_DEVICE_Libraryusbd_audio_ifhal庫AudioCmd(uint8_t *pbuf, uint32_t size, uint8_t cmd)HAL_I2S_Transmit_DMASTM32_USB_DEVICE_Libraryusbd_audio_ifhal庫

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總結

以上是生活随笔為你收集整理的STM32 USB AUDIO 基础篇①——通过STM32CubeMX生成USB Speaker音频播放Demo（史上最简单）的全部內(nèi)容，希望文章能夠幫你解決所遇到的問題。

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