STM32F769I: no IT for DMA2 Stream 1

[TheCodeurFou]

Hello,

 

I am blocked with a personnal project using a STM32F769I-DISCO, TouchGFX and audio: DMA IT is not triggered. I have no idea why, no idea how to investigate more in the code. I will provide few things in my question, not because I don't want but because I don't know yet what to provide.

 

I created a project with TouchGFX Designer and now I want to add the BSP code to play audio. My code initialize all devices (created by the tool) and try to play audio

 /* Initialize all configured peripherals */
 MX_GPIO_Init();
 MX_DSIHOST_DSI_Init();
 MX_LTDC_Init();
 MX_FMC_Init();
 MX_QUADSPI_Init();
 MX_DMA2D_Init();
 MX_I2C4_Init();
 MX_LIBJPEG_Init();
 MX_CRC_Init();
 MX_USART1_UART_Init();
 MX_DFSDM1_Init();
 MX_SAI1_Init();
 MX_I2S1_Init();
 MX_TouchGFX_Init();
 /* Call PreOsInit function */
 MX_TouchGFX_PreOSInit();
 /* USER CODE BEGIN 2 */
 /* Init audio */
 initAudio();
 playAudio();
 while(1);

 Audio code

/**
 * @brief Plays the audio file
 * @PAram None
 * @retval None
 */
void playAudio(void)
{
//	BSP_AUDIO_OUT_Play((uint16_t*)&ptrAudio, sizeAudio);
	BSP_AUDIO_OUT_Play((uint16_t*)&A_subtle_radar_ping_wav, A_subtle_radar_ping_wav_len);
}

/**
 * @brief Initialize the audio player
 * @PAram None
 * @retval None
 */
void initAudio(void)
{
	GetFileInfo(info);
	BSP_AUDIO_OUT_Init(OUTPUT_DEVICE_AUTO, uwVolume, info->SampleRate);
}

 With this code, the audio file is played, nice. But it's played in a loop which is not what I want. If it could play only once, it would be nice.

So I created a smaller project with CubeIDE to learn. Same DFSDM1, SAI1, I2S1 init, same "audio code": audio loops as before.

I found an ugly way : IT number 57 (DMA2_Stream1)is fired, which then call a callback

/**
 * @brief Calculates the remaining file size and new position of the pointer.
 * @PAram None
 * @retval None
 */
void BSP_AUDIO_OUT_TransferComplete_CallBack(void)
{
 BSP_AUDIO_OUT_Stop(CODEC_PDWN_SW);
}

Ugly, but audio is then stopped and I also know that DMA IT is also working.

 

But when I try to do the same in my previous big TouchGFX code, I saw (debug) that IT is enabled but never fired.

So, questions are:

 - Is there a way to specify to configure the DMA not as a loop but a single shot?

 - Why IT is not fired? What should I investigate? Even if there is a positive answer to my previous question, I would like to understand what is wrong witht the IT