sai初始化之后示波器测量发现bclk输出持续高电平
我看手册上说，一旦使能sai bclk就会有输出信号。求教
另外，仿真的时候GPIO 的IDR寄存器有1 0 的变化 ODR没有，这种情况有哪位遇到过吗？

void SystemClock_Config(void)
{

  RCC_OscInitTypeDef RCC_OscInitStruct;
  RCC_ClkInitTypeDef RCC_ClkInitStruct;
  RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;

  __HAL_RCC_PWR_CLK_ENABLE();

  __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE3);

  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE;
  RCC_OscInitStruct.HSEState = RCC_HSE_ON;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE;
  RCC_OscInitStruct.PLL.PLLM = 16;
  RCC_OscInitStruct.PLL.PLLN = 250;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV4;
  RCC_OscInitStruct.PLL.PLLQ = 8;
  RCC_OscInitStruct.PLL.PLLR = 2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;
  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_3) != HAL_OK)
  {
    Error_Handler();
  }

  PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_SAI1|RCC_PERIPHCLK_SDIO
                              |RCC_PERIPHCLK_CLK48;
  PeriphClkInitStruct.PLLSAI.PLLSAIM = 16;
  PeriphClkInitStruct.PLLSAI.PLLSAIN = 192;
  PeriphClkInitStruct.PLLSAI.PLLSAIQ = 3;
  PeriphClkInitStruct.PLLSAI.PLLSAIP = RCC_PLLSAIP_DIV2;
  PeriphClkInitStruct.PLLSAIDivQ = 1;
  PeriphClkInitStruct.Clk48ClockSelection = RCC_CLK48CLKSOURCE_PLLQ;
  PeriphClkInitStruct.SdioClockSelection = RCC_SDIOCLKSOURCE_CLK48;
  PeriphClkInitStruct.Sai1ClockSelection = RCC_SAI1CLKSOURCE_PLLSAI;
  if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct) != HAL_OK)
  {
    Error_Handler();
  }

  HAL_SYSTICK_Config(HAL_RCC_GetHCLKFreq()/1000);

  HAL_SYSTICK_CLKSourceConfig(SYSTICK_CLKSOURCE_HCLK);

  /* SysTick_IRQn interrupt configuration */
  HAL_NVIC_SetPriority(SysTick_IRQn, 0, 0);
}


/* SAI1 init function */
static void MX_SAI1_Init(void)
{
  HAL_SAI_DeInit(&hsai_BlockB1);   
  hsai_BlockB1.Instance = SAI1_Block_B;
  hsai_BlockB1.Init.AudioMode = SAI_MODEMASTER_TX;
  hsai_BlockB1.Init.Synchro = SAI_ASYNCHRONOUS;
  hsai_BlockB1.Init.OutputDrive = SAI_OUTPUTDRIVE_DISABLE;
  hsai_BlockB1.Init.NoDivider = SAI_MASTERDIVIDER_ENABLE;
  hsai_BlockB1.Init.FIFOThreshold = SAI_FIFOTHRESHOLD_HF;
  hsai_BlockB1.Init.ClockSource = SAI_CLKSOURCE_NA;///？？？？
  hsai_BlockB1.Init.AudioFrequency = SAI_AUDIO_FREQUENCY_48K;//192k original data
  hsai_BlockB1.Init.SynchroExt = SAI_SYNCEXT_DISABLE;//two sai
  hsai_BlockB1.Init.MonoStereoMode = SAI_STEREOMODE;
  hsai_BlockB1.Init.CompandingMode = SAI_NOCOMPANDING;
  hsai_BlockB1.Init.TriState = SAI_OUTPUT_NOTRELEASED;
  if (HAL_SAI_InitProtocol(&hsai_BlockB1, SAI_I2S_STANDARD, SAI_PROTOCOL_DATASIZE_16BITEXTENDED, 2) != HAL_OK)
  {
    Error_Handler();
  }
  (&hsai_BlockB1)->Instance->CR1 |= 0X00002000;
  __HAL_SAI_ENABLE(&hsai_BlockB1);


}

时钟配置和SAI配置如上