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转：将STM32F746G-Disco开发板做助听器

2016-7-11 17:57:57 3734 助听器

0 STM32F746G-Disco开发板上带有数字麦克风和音频输出，它们组合起来就可以实现助听器的功能。只要把麦克风的输入信号进行放大，然后在通过音频接口输出。下面程序演示了助听器的功能，它来自Mbed例程。首先它通过数字麦克风（U21、U22）获取环境声音，将数据保存到接收缓冲区，然后将数字音频发送到音频输出（U11）。如果我们在CN10（音频输出）上接一个耳机或者扬声器，就可以清楚的听到放大后的环境声音，效果非常不错。在连接耳机时，需要注意保护耳朵，因为开发板上没有音量控制的旋钮，不能调节音量。 #include "mbed.h" #include "AUDIO_DISCO_F746NG.h" #include "SDRAM_DISCO_F746NG.h" AUDIO_DISCO_F746NG audio; // audio IN_OUT buffer is stored in the SDRAM, SDRAM needs to be initialized // and FMC enabled SDRAM_DISCO_F746NG sdram; DigitalOut led_green(LED1); DigitalOut led_red(LED2); Serial pc(USBTX, USBRX); typedef enum { BUFFER_OFFSET_NONE = 0, BUFFER_OFFSET_HALF = 1, BUFFER_OFFSET_FULL = 2, }BUFFER_StateTypeDef; #define AUDIO_BLOCK_SIZE ((uint32_t)512) #define AUDIO_BUFFER_IN SDRAM_DEVICE_ADDR /* In SDRAM / #define AUDIO_BUFFER_OUT (SDRAM_DEVICE_ADDR + (AUDIO_BLOCK_SIZE 2)) /* In SDRAM / __IO uint32_t audio_rec_buffer_state = BUFFER_OFFSET_NONE; static uint8_t SetSysClock_PLL_HSE_200MHz(); int main() { SetSysClock_PLL_HSE_200MHz(); pc.baud(9600); pc.printf("nnAUDIO LOOPBACK EXAMPLE START:n"); led_red = 0; pc.printf("nAUDIO RECORD INIT OKn"); pc.printf("Microphones sound streamed to headphonesn"); / Initialize SDRAM buffers / memset((uint16_t)AUDIO_BUFFER_IN, 0, AUDIO_BLOCK_SIZE2); memset((uint16_t)AUDIO_BUFFER_OUT, 0, AUDIO_BLOCK_SIZE2); audio_rec_buffer_state = BUFFER_OFFSET_NONE; / Start Recording / audio.IN_Record((uint16_t)AUDIO_BUFFER_IN, AUDIO_BLOCK_SIZE); /* Start Playback / audio.OUT_SetAudioFrameSlot(CODEC_AUDIOFRAME_SLOT_02); audio.OUT_Play((uint16_t)AUDIO_BUFFER_OUT, AUDIO_BLOCK_SIZE * 2); while (1) { /* Wait end of half block recording / while(audio_rec_buffer_state == BUFFER_OFFSET_HALF) { } audio_rec_buffer_state = BUFFER_OFFSET_NONE; / Copy recorded 1st half block / memcpy((uint16_t )(AUDIO_BUFFER_OUT), (uint16_t )(AUDIO_BUFFER_IN), AUDIO_BLOCK_SIZE); / Wait end of one block recording / while(audio_rec_buffer_state == BUFFER_OFFSET_FULL) { } audio_rec_buffer_state = BUFFER_OFFSET_NONE; / Copy recorded 2nd half block / memcpy((uint16_t )(AUDIO_BUFFER_OUT + (AUDIO_BLOCK_SIZE)), (uint16_t )(AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE)), AUDIO_BLOCK_SIZE); } } /------------------------------------------------------------------------------------- Callbacks implementation: the callbacks API are defined __weak in the stm32746g_discovery_audio.c file and their implementation should be done in the user code if they are needed. Below some examples of callback implementations. -------------------------------------------------------------------------------------/ /* * @brief Manages the DMA Transfer complete interrupt. * @param None * @retval None / void BSP_AUDIO_IN_TransferComplete_CallBack(void) { audio_rec_buffer_state = BUFFER_OFFSET_FULL; return; } /* * @brief Manages the DMA Half Transfer complete interrupt. * @param None * @retval None */ void BSP_AUDIO_IN_HalfTransfer_CallBack(void) { audio_rec_buffer_state = BUFFER_OFFSET_HALF; return; } 0
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lee_st · 2016-7-14 10:00:17 沙发程序分析：首先定义缓冲区大小和音频输入输出缓冲区 #define AUDIO_BLOCK_SIZE ((uint32_t)512) #define AUDIO_BUFFER_IN SDRAM_DEVICE_ADDR /* In SDRAM / #define AUDIO_BUFFER_OUT (SDRAM_DEVICE_ADDR + (AUDIO_BLOCK_SIZE 2)) /* In SDRAM / 然后进行初始化，初始化部分完成下面几个功能：分配缓冲区 / Initialize SDRAM buffers / memset((uint16_t)AUDIO_BUFFER_IN, 0, AUDIO_BLOCK_SIZE2); memset((uint16_t)AUDIO_BUFFER_OUT, 0, AUDIO_BLOCK_SIZE2); 启用录音功能，将音频输入保存到输入缓冲区 / Start Recording / audio.IN_Record((uint16_t)AUDIO_BUFFER_IN, AUDIO_BLOCK_SIZE); 设置音频回放 audio.OUT_SetAudioFrameSlot(CODEC_AUDIOFRAME_SLOT_02); audio.OUT_Play((uint16_t)AUDIO_BUFFER_OUT, AUDIO_BLOCK_SIZE 2); 在主循环中，等待音频输入完成，然后将输入缓冲区（AUDIO_BUFFER_IN）的数据复制到输出（AUDIO_BUFFER_OUT）缓冲区。音频输入的录音和回放，都是使用DMA方式自动完成的，所以无需CPU处理。

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