【LPC54114双核任务三】+ LPC54114音频学习

队长shiwo

       LPC54114 开发板上与音频部分相关的模块有：PDM 数字麦克风(SPH0641LM4H)--->板子上的U7 和 I2S 音频接口(WM8904)--->板子上的CN7(音频输出) 和 CN8(音频输入)。
SPH0641LM4H主要特点 ：
1、灵敏度范围：-26+/-1DBdB
2、卓越的可靠性及稳定性，100%工厂测试
3. 卓越的信噪比：59dB
4、低功耗，超小体积
5、表面贴装技术
6、优良的温度系数：Max±0.60 dB/℃
7、优良的抗压系数：Max±0.55 dB/Kpa
8、专利新型硅技术，典型应用于手机、数字及模拟录音机、数码相机、便携式游戏控制器、火警报警设备、噪声控制器、汽车电子等。
WM8904主要特点：
1、高信噪比的64分贝
2、235 uA的低电流消耗的低功耗模式
3、多性能模式(睡眠、低功耗、标准性能和超声波模式)
4、平直的频率响应
5、射频屏蔽
6、零高度Mic
7、支持双多路复用通道
8、标准SMD回流
9、超声波支持
10、敏感性匹配
11、体积小

板子上原理图连接：


        LPC5411x系列包含了一个无晶振全速USB接口，一个DMIC(数字麦克风)子系统连接两个PDM麦克风和两个IIS接口，DMIC接口用来连接数字PDM麦克风和转换在硬件上的PDM音频数据流成16位PCM音频数据，PDM麦克风操作只需要两种信号线（时钟和数据），而IIS需要三种（时钟、数据和声道选择）。

左边是麦克风接口，右边是两路输出




LPC54114的通过IIS总线的DMA0发送音频数据到WM8904，然后通过CN7播放音频数据
使用万利的Demo程序来测试下：
1、dmic_init()是PDM 数字麦克风(SPH0641LM4H)的初始化函数， 并通过中断函数来控制LD8来指示外部声音对它的影响

1. uint8_t dmic_init(void)
   
2. {       
   
3.         uint8_t ret = 0;
   
4.         uint32_t i = 0;
   
5.         dmic_channel_config_t dmic_channel_cfg;
   
6.        
   
7.         /* PDM interface */
   
8.         IOCON_PinMuxSet(IOCON, 1, 15, IOCON_FUNC1 | IOCON_DIGITAL_EN);  /* PDM CLK  0 */
   
9.         IOCON_PinMuxSet(IOCON, 1, 16, IOCON_FUNC1 | IOCON_DIGITAL_EN);  /* PDM DATA 0 */
   
10.        
    
11.         /* DMIC uses 12MHz FRO clock */
    
12.   CLOCK_AttachClk(kFRO12M_to_DMIC);
    
13.         /*12MHz divided by 15 = 800KHz PDM clock */
    
14.         CLOCK_SetClkDiv(kCLOCK_DivDmicClk, 14, false);
    
15.         dmic_channel_cfg.divhfclk = kDMIC_PdmDiv1;
    
16.         dmic_channel_cfg.osr = 25U;
    
17.         dmic_channel_cfg.gainshft = 3U;
    
18.         dmic_channel_cfg.preac2coef = kDMIC_CompValueZero;
    
19.         dmic_channel_cfg.preac4coef = kDMIC_CompValueZero;
    
20.         dmic_channel_cfg.dc_cut_level = kDMIC_DcCut155;
    
21.         dmic_channel_cfg.post_dc_gain_reduce = 0U;
    
22.         dmic_channel_cfg.saturate16bit = 1U;
    
23.         dmic_channel_cfg.sample_rate = kDMIC_PhyFullSpeed;
    
24.         DMIC_Init(DMIC0);
    
25.        
    
26.         DMIC_ConfigIO(DMIC0, kDMIC_PdmStereo);
    
27.         DMIC_Use2fs(DMIC0, true);
    
28.         DMIC_SetOperationMode(DMIC0, kDMIC_OperationModeInterrupt);
    
29.         DMIC_ConfigChannel(DMIC0, kDMIC_Channel0, kDMIC_Left, &dmic_channel_cfg);
    
30.         DMIC_ConfigChannel(DMIC0, kDMIC_Channel1, kDMIC_Right, &dmic_channel_cfg);
    
31.         DMIC_FifoChannel(DMIC0, kDMIC_Channel0, FIFO_DEPTH, true, true);
    
32.         DMIC_FifoChannel(DMIC0, kDMIC_Channel1, FIFO_DEPTH, true, true);
    
33.        
    
34.         /*Gain of the noise estimator */
    
35.         DMIC_SetGainNoiseEstHwvad(DMIC0, 0x02U);
    
36.         /*Gain of the signal estimator */
    
37.         DMIC_SetGainSignalEstHwvad(DMIC0, 0x01U);
    
38.         /* 00 = first filter by-pass, 01 = hpf_shifter=1, 10 = hpf_shifter=4 */
    
39.         DMIC_SetFilterCtrlHwvad(DMIC0, 0x01U);
    
40.         /*input right-shift of (GAIN x 2 -10) bits (from -10bits (0000) to +14bits (1100)) */
    
41.         DMIC_SetInputGainHwvad(DMIC0, 0x04U);
    
42.         DisableDeepSleepIRQ(HWVAD0_IRQn);
    
43.         DMIC_HwvadEnableIntCallback(DMIC0, DMIC0_HWVAD_Callback);
    
44.         DMIC_EnableChannnel(DMIC0, (DMIC_CHANEN_EN_CH0(1) | DMIC_CHANEN_EN_CH1(1)));
    
45.         /* reset hwvad internal interrupt */
    
46.         DMIC_CtrlClrIntrHwvad(DMIC0, true);
    
47.         /* To clear first spurious interrupt */
    
48.         for (i = 0; i < 0xFFFFU; i++)
    
49.         {
    
50.         }
    
51.         /*HWVAD Normal operation */
    
52.         DMIC_CtrlClrIntrHwvad(DMIC0, false);
    
53.         NVIC_ClearPendingIRQ(HWVAD0_IRQn);
    
54.         EnableDeepSleepIRQ(HWVAD0_IRQn);
    
55. 
    
56.         ret = 1;
    
57.        
    
58.         return ret;
    
59. }

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2、wm8904_i2s_init() 是I2S 音频输入/输出接口(WM8904)的初始化函数，并以LD4来指示WM8904的存在。通过对StartSoundPlayback()函数的调用，可播放存储在music.h中的音频数据

1. uint8_t wm8904_i2s_init(void)
   
2. {
   
3. // we need initial i2c here, but we initial the right i2c at pct2075 already
   
4.        
   
5.         /* Initialize PLL clock */
   
6.         CLOCK_AttachClk(kFRO12M_to_SYS_PLL);
   
7.         CLOCK_SetPLLFreq(&pllSetup);
   
8. 
   
9.         CLOCK_AttachClk(kSYS_PLL_to_FLEXCOMM6);
   
10.         CLOCK_AttachClk(kSYS_PLL_to_FLEXCOMM7);
    
11.         /* Attach PLL clock to MCLK for I2S, no divider */
    
12.         CLOCK_AttachClk(kSYS_PLL_to_MCLK);
    
13.         SYSCON->MCLKDIV = SYSCON_MCLKDIV_DIV(0U);
    
14.         /* reset FLEXCOMM for I2S */
    
15.         RESET_PeripheralReset(kFC6_RST_SHIFT_RSTn);
    
16.         RESET_PeripheralReset(kFC7_RST_SHIFT_RSTn);
    
17.        
    
18.         /* I2S */
    
19. // Flexcomm 6 I2S Rx
    
20.         IOCON_PinMuxSet(IOCON, 0, 5, IOCON_FUNC1 | IOCON_DIGITAL_EN); /* Flexcomm 6 / SDA */
    
21.         IOCON_PinMuxSet(IOCON, 0, 6, IOCON_FUNC1 | IOCON_DIGITAL_EN); /* Flexcomm 6 / WS */
    
22.         IOCON_PinMuxSet(IOCON, 0, 7, IOCON_FUNC1 | IOCON_DIGITAL_EN); /* Flexcomm 6 / SCK */
    
23. // Flexcomm 7 I2S Tx
    
24.         IOCON_PinMuxSet(IOCON, 1, 12, IOCON_FUNC4 | IOCON_DIGITAL_EN); /* Flexcomm 7 / SCK */
    
25.         IOCON_PinMuxSet(IOCON, 1, 13, IOCON_FUNC4 | IOCON_DIGITAL_EN);  /* Flexcomm 7 / SDA */
    
26.         IOCON_PinMuxSet(IOCON, 1, 14, IOCON_FUNC4 | IOCON_DIGITAL_EN);  /* Flexcomm 7 / WS */
    
27. 
    
28.         /* MCLK output for I2S */
    
29.         IOCON_PinMuxSet(IOCON, 1, 17, IOCON_FUNC4 | IOCON_MODE_INACT | IOCON_DIGITAL_EN);
    
30.         SYSCON->MCLKIO = 1U;
    
31.         /*
    
32.          * enableMaster = true;
    
33.          * baudRate_Bps = 100000U;
    
34.          * enableTimeout = false;
    
35.      配置WM8904相关寄存器
    
36.          */
    
37.         WM8904_GetDefaultConfig(&codecConfig);
    
38.         codecHandle.i2c = I2C4;
    
39.         if (WM8904_Init(&codecHandle, &codecConfig) != kStatus_Success)
    
40.         {
    
41.                 PRINTF("WM8904_Init failed!\r\n");
    
42.                 led_off(7);
    
43.         }
    
44.         else
    
45.         {
    
46.                 led_on(7);
    
47.         }
    
48.         /* Initial volume kept low for hearing safety. */
    
49.         /* Adjust it to your needs, 0x0006 for -51 dB, 0x0039 for 0 dB etc. */
    
50.         WM8904_SetVolume(&codecHandle, 0x0006, 0x0006);//设置音量
    
51.        
    
52.         I2S_TxGetDefaultConfig(&s_TxConfig);
    
53.         s_TxConfig.divider = CLOCK_GetPllOutFreq() / 48000U / 16U / 2U;       
    
54.         I2S_RxGetDefaultConfig(&s_RxConfig);
    
55.        
    
56.         I2S_TxInit(I2S_TX, &s_TxConfig);
    
57.         I2S_RxInit(I2S_RX, &s_RxConfig);
    
58.        
    
59.         DMA_Init(DMA0);
    
60. 
    
61.         DMA_EnableChannel(DMA0, I2S_DMA_TX);
    
62.         DMA_EnableChannel(DMA0, I2S_DMA_RX);
    
63.         DMA_SetChannelPriority(DMA0, I2S_DMA_TX, kDMA_ChannelPriority3);
    
64.         DMA_SetChannelPriority(DMA0, I2S_DMA_RX, kDMA_ChannelPriority2);
    
65.         DMA_CreateHandle(&s_DmaTxHandle, DMA0, I2S_DMA_TX);
    
66.         DMA_CreateHandle(&s_DmaRxHandle, DMA0, I2S_DMA_RX);
    
67. 
    
68.         if (true)
    
69.         {
    
70.                 StartSoundPlayback();
    
71.         }
    
72.         else
    
73.         {
    
74.                 StartDigitalLoopback();
    
75.         }
    
76. }

复制代码

3、在函数StartSoundPlayback中创建DMA，并发送两次音频数据

1. static void StartSoundPlayback(void)
   
2. {
   
3.     PRINTF("Setup looping playback of sine wave\r\n");
   
4. 
   
5.     s_TxTransfer.data = &g_Music[0];
   
6.     s_TxTransfer.dataSize = sizeof(g_Music);
   
7. 
   
8.     I2S_TxTransferCreateHandleDMA(I2S_TX, &s_TxHandle, &s_DmaTxHandle, TxCallback, (void *)&s_TxTransfer);//创建DMA
   
9.     I2S_TxTransferSendDMA(I2S_TX, &s_TxHandle, s_TxTransfer);
   
10.     I2S_TxTransferSendDMA(I2S_TX, &s_TxHandle, s_TxTransfer); /* TODO needed to queue twice due to current state of driver */
    
11. }

复制代码

1. /*!
   
2. * @brief One period of sine wave in 108 32-bit samples.
   
3. * One sample contains two 16-bit channels.
   
4. */
   
5. __ALIGN_BEGIN uint8_t g_Music[] __ALIGN_END = {
   
6.     0x00U, 0x00U, 0x00U, 0x00U, 0x71U, 0x07U, 0x71U, 0x07U, 0xDCU, 0x0EU, 0xDCU, 0x0EU, 0x39U, 0x16U, 0x39U, 0x16U,
   
7.     0x84U, 0x1DU, 0x84U, 0x1DU, 0xB5U, 0x24U, 0xB5U, 0x24U, 0xC6U, 0x2BU, 0xC6U, 0x2BU, 0xB2U, 0x32U, 0xB2U, 0x32U,
   
8.     0x71U, 0x39U, 0x71U, 0x39U, 0xFFU, 0x3FU, 0xFFU, 0x3FU, 0x55U, 0x46U, 0x55U, 0x46U, 0x6FU, 0x4CU, 0x6FU, 0x4CU,
   
9.     0x46U, 0x52U, 0x46U, 0x52U, 0xD6U, 0x57U, 0xD6U, 0x57U, 0x19U, 0x5DU, 0x19U, 0x5DU, 0x0CU, 0x62U, 0x0CU, 0x62U,
   
10.     0xABU, 0x66U, 0xABU, 0x66U, 0xF0U, 0x6AU, 0xF0U, 0x6AU, 0xD9U, 0x6EU, 0xD9U, 0x6EU, 0x61U, 0x72U, 0x61U, 0x72U,
    
11.     0x87U, 0x75U, 0x87U, 0x75U, 0x46U, 0x78U, 0x46U, 0x78U, 0x9EU, 0x7AU, 0x9EU, 0x7AU, 0x8BU, 0x7CU, 0x8BU, 0x7CU,
    
12.     0x0DU, 0x7EU, 0x0DU, 0x7EU, 0x21U, 0x7FU, 0x21U, 0x7FU, 0xC7U, 0x7FU, 0xC7U, 0x7FU, 0xFEU, 0x7FU, 0xFEU, 0x7FU,
    
13.     0xC7U, 0x7FU, 0xC7U, 0x7FU, 0x21U, 0x7FU, 0x21U, 0x7FU, 0x0DU, 0x7EU, 0x0DU, 0x7EU, 0x8BU, 0x7CU, 0x8BU, 0x7CU,
    
14.     0x9EU, 0x7AU, 0x9EU, 0x7AU, 0x46U, 0x78U, 0x46U, 0x78U, 0x87U, 0x75U, 0x87U, 0x75U, 0x61U, 0x72U, 0x61U, 0x72U,
    
15.     0xD9U, 0x6EU, 0xD9U, 0x6EU, 0xF0U, 0x6AU, 0xF0U, 0x6AU, 0xABU, 0x66U, 0xABU, 0x66U, 0x0CU, 0x62U, 0x0CU, 0x62U,
    
16.     0x19U, 0x5DU, 0x19U, 0x5DU, 0xD6U, 0x57U, 0xD6U, 0x57U, 0x46U, 0x52U, 0x46U, 0x52U, 0x6FU, 0x4CU, 0x6FU, 0x4CU,
    
17.     0x55U, 0x46U, 0x55U, 0x46U, 0xFFU, 0x3FU, 0xFFU, 0x3FU, 0x71U, 0x39U, 0x71U, 0x39U, 0xB2U, 0x32U, 0xB2U, 0x32U,
    
18.     0xC6U, 0x2BU, 0xC6U, 0x2BU, 0xB5U, 0x24U, 0xB5U, 0x24U, 0x84U, 0x1DU, 0x84U, 0x1DU, 0x39U, 0x16U, 0x39U, 0x16U,
    
19.     0xDCU, 0x0EU, 0xDCU, 0x0EU, 0x71U, 0x07U, 0x71U, 0x07U, 0x00U, 0x00U, 0x00U, 0x00U, 0x8FU, 0xF8U, 0x8FU, 0xF8U,
    
20.     0x24U, 0xF1U, 0x24U, 0xF1U, 0xC7U, 0xE9U, 0xC7U, 0xE9U, 0x7CU, 0xE2U, 0x7CU, 0xE2U, 0x4BU, 0xDBU, 0x4BU, 0xDBU,
    
21.     0x3AU, 0xD4U, 0x3AU, 0xD4U, 0x4EU, 0xCDU, 0x4EU, 0xCDU, 0x8FU, 0xC6U, 0x8FU, 0xC6U, 0x01U, 0xC0U, 0x01U, 0xC0U,
    
22.     0xABU, 0xB9U, 0xABU, 0xB9U, 0x91U, 0xB3U, 0x91U, 0xB3U, 0xBAU, 0xADU, 0xBAU, 0xADU, 0x2AU, 0xA8U, 0x2AU, 0xA8U,
    
23.     0xE7U, 0xA2U, 0xE7U, 0xA2U, 0xF4U, 0x9DU, 0xF4U, 0x9DU, 0x55U, 0x99U, 0x55U, 0x99U, 0x10U, 0x95U, 0x10U, 0x95U,
    
24.     0x27U, 0x91U, 0x27U, 0x91U, 0x9FU, 0x8DU, 0x9FU, 0x8DU, 0x79U, 0x8AU, 0x79U, 0x8AU, 0xBAU, 0x87U, 0xBAU, 0x87U,
    
25.     0x62U, 0x85U, 0x62U, 0x85U, 0x75U, 0x83U, 0x75U, 0x83U, 0xF3U, 0x81U, 0xF3U, 0x81U, 0xDFU, 0x80U, 0xDFU, 0x80U,
    
26.     0x39U, 0x80U, 0x39U, 0x80U, 0x02U, 0x80U, 0x02U, 0x80U, 0x39U, 0x80U, 0x39U, 0x80U, 0xDFU, 0x80U, 0xDFU, 0x80U,
    
27.     0xF3U, 0x81U, 0xF3U, 0x81U, 0x75U, 0x83U, 0x75U, 0x83U, 0x62U, 0x85U, 0x62U, 0x85U, 0xBAU, 0x87U, 0xBAU, 0x87U,
    
28.     0x79U, 0x8AU, 0x79U, 0x8AU, 0x9FU, 0x8DU, 0x9FU, 0x8DU, 0x27U, 0x91U, 0x27U, 0x91U, 0x10U, 0x95U, 0x10U, 0x95U,
    
29.     0x55U, 0x99U, 0x55U, 0x99U, 0xF4U, 0x9DU, 0xF4U, 0x9DU, 0xE7U, 0xA2U, 0xE7U, 0xA2U, 0x2AU, 0xA8U, 0x2AU, 0xA8U,
    
30.     0xBAU, 0xADU, 0xBAU, 0xADU, 0x91U, 0xB3U, 0x91U, 0xB3U, 0xABU, 0xB9U, 0xABU, 0xB9U, 0x01U, 0xC0U, 0x01U, 0xC0U,
    
31.     0x8FU, 0xC6U, 0x8FU, 0xC6U, 0x4EU, 0xCDU, 0x4EU, 0xCDU, 0x3AU, 0xD4U, 0x3AU, 0xD4U, 0x4BU, 0xDBU, 0x4BU, 0xDBU,
    
32.     0x7CU, 0xE2U, 0x7CU, 0xE2U, 0xC7U, 0xE9U, 0xC7U, 0xE9U, 0x24U, 0xF1U, 0x24U, 0xF1U, 0x8FU, 0xF8U, 0x8FU, 0xF8U,
    
33. };

复制代码

测试只听到有“嗯嗯嗯嗯嗯嗯”的声音，不知道是哪里有问题了，搞不懂。。。

SPH0641LM4H.pdf (920.21 KB, 下载次数: 4)

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WM8904.pdf (1.77 MB, 下载次数: 8)

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AN11855_LPC5411x_voice_detection_recognition_v.2.pdf (731.52 KB, 下载次数: 9)

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阅读全文

okwh

没问题，那个music.h中是单频率数据，就是这声音

队长shiwo

okwh 发表于 2017-8-1 13:49
没问题，那个music.h中是单频率数据，就是这声音

好的，谢谢大神了，我再学习学习

epochal

好内容！值得参考！