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我用这个SystemClock_Config() 设置不同的主频后,然后 I2Sxext_Mode_Config() 设置采样频率。是否设置不同的主频时,只要给 I2Sxext_Mode_Config() 的参数_usAudioFreq不变,实际设置的采样频率的就不变?
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
/** Supply configuration update enable
*/
HAL_PWREx_ConfigSupply(PWR_LDO_SUPPLY);
/** Configure the main internal regulator output voltage
*/
__HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE0);
while(!__HAL_PWR_GET_FLAG(PWR_FLAG_VOSRDY)) {}
/** Macro to configure the PLL clock source
*/
__HAL_RCC_PLL_PLLSOURCE_CONFIG(RCC_PLLSOURCE_HSE);
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
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 = 5;
RCC_OscInitStruct.PLL.PLLN = 40; //112 80 ********不同的主频***********
RCC_OscInitStruct.PLL.PLLP = 2;
RCC_OscInitStruct.PLL.PLLQ = 2;
RCC_OscInitStruct.PLL.PLLR = 2;
RCC_OscInitStruct.PLL.PLLRGE = RCC_PLL1VCIRANGE_2;
RCC_OscInitStruct.PLL.PLLVCOSEL = RCC_PLL1VCOWIDE;
RCC_OscInitStruct.PLL.PLLFRACN = 0;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2
|RCC_CLOCKTYPE_D3PCLK1|RCC_CLOCKTYPE_D1PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.SYSCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.AHBCLKDivider = RCC_HCLK_DIV1;
RCC_ClkInitStruct.APB3CLKDivider = RCC_APB3_DIV2;
RCC_ClkInitStruct.APB1CLKDivider = RCC_APB1_DIV2;
RCC_ClkInitStruct.APB2CLKDivider = RCC_APB2_DIV2;
RCC_ClkInitStruct.APB4CLKDivider = RCC_APB4_DIV2;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7) != HAL_OK)
{
Error_Handler();
}
}
void I2Sxext_Mode_Config(const uint16_t _usStandard, const uint16_t _usWordLen,const uint32_t _usAudioFreq)
{
/* PLL时钟根据AudioFreq设置 (44.1khz vs 48khz groups) */
BSP_AUDIO_OUT_ClockConfig(&I2Sext_InitStructure,_usAudioFreq, NULL); /* Clock config is shared between AUDIO IN and OUT */
/* 打开 I2S2 APB1 时钟 */
WM8978_CLK_ENABLE();
/* 复位 SPI1 外设到缺省状态 */
HAL_I2S_DeInit(&I2Sext_InitStructure);
/* I2S2 外设配置 */
I2Sext_InitStructure.Instance = WM8978_I2Sx_SPI;
I2Sext_InitStructure.Init.Mode = I2S_MODE_MASTER_RX; /* 配置I2S工作模式 */
I2Sext_InitStructure.Init.Standard = _usStandard; /* 接口标准 */
I2Sext_InitStructure.Init.DataFormat = _usWordLen; /* 数据格式,16bit */
I2Sext_InitStructure.Init.MCLKOutput = I2S_MCLKOUTPUT_ENABLE; /* 主时钟模式 */
I2Sext_InitStructure.Init.AudioFreq = _usAudioFreq; /* 音频采样频率 */
I2Sext_InitStructure.Init.CPOL = I2S_CPOL_LOW;
if(HAL_I2S_Init(&I2Sext_InitStructure) != HAL_OK)
{
printf("I2S初始化失败\r\n");
}
}
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