AUDIO DISCO_F746NG audioloop basic example
Dependencies: BSP_DISCO_F746NG
main.cpp
- Committer:
- Jerome Coutant
- Date:
- 2019-11-20
- Revision:
- 5:66c230f74325
- Parent:
- 0:da04816fb411
File content as of revision 5:66c230f74325:
#include "mbed.h" #include "stm32746g_discovery_audio.h" #include "stm32746g_discovery_sdram.h" 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 #define AUDIO_BUFFER_OUT (AUDIO_BUFFER_IN + (AUDIO_BLOCK_SIZE * 2)) volatile uint32_t audio_rec_buffer_state = BUFFER_OFFSET_NONE; int main() { printf("\n\nAUDIO LOOPBACK EXAMPLE START:\n"); BSP_AUDIO_IN_OUT_Init(INPUT_DEVICE_DIGITAL_MICROPHONE_2, OUTPUT_DEVICE_HEADPHONE, DEFAULT_AUDIO_IN_FREQ, DEFAULT_AUDIO_IN_BIT_RESOLUTION, DEFAULT_AUDIO_IN_CHANNEL_NBR); printf("AUDIO loop from digital micro (U20 & U21 components on board) to headphone (CN10 jack connector)\n"); /* Initialize SDRAM buffers */ BSP_SDRAM_Init(); memset((uint16_t *)AUDIO_BUFFER_IN, 0, AUDIO_BLOCK_SIZE * 2); memset((uint16_t *)AUDIO_BUFFER_OUT, 0, AUDIO_BLOCK_SIZE * 2); printf("SDRAM init done\n"); audio_rec_buffer_state = BUFFER_OFFSET_NONE; /* Start Recording */ if (BSP_AUDIO_IN_Record((uint16_t *)AUDIO_BUFFER_IN, AUDIO_BLOCK_SIZE) != AUDIO_OK) { printf("BSP_AUDIO_IN_Record error\n"); } /* Start Playback */ BSP_AUDIO_OUT_SetAudioFrameSlot(CODEC_AUDIOFRAME_SLOT_02); if (BSP_AUDIO_OUT_Play((uint16_t *)AUDIO_BUFFER_OUT, AUDIO_BLOCK_SIZE * 2) != AUDIO_OK) { printf("BSP_AUDIO_OUT_Play error\n"); } 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; } /** * @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; } /** * @brief Audio IN Error callback function. * @param None * @retval None */ void BSP_AUDIO_IN_Error_CallBack(void) { printf("BSP_AUDIO_IN_Error_CallBack\n"); }