static void CRS_Init(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
HAL_RCC_GetOscConfig(&RCC_OscInitStruct);
if (RCC_OscInitStruct.HSI48State != RCC_HSI48_ON)
{
/* Enable HSI48 and LSE Oscillator*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48 | RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
}
/* Enable CRS clock*/
__HAL_RCC_CRS_CLK_ENABLE();
/* Output HSI48 MCO pin(PA8) */
HAL_RCC_MCOConfig(RCC_MCO, RCC_MCOSOURCE_HSI48, RCC_MCO_DIV1);
}
static void CRS_Init(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
HAL_RCC_GetOscConfig(&RCC_OscInitStruct);
if (RCC_OscInitStruct.HSI48State != RCC_HSI48_ON)
{
/* Enable HSI48 and LSE Oscillator*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48 | RCC_OSCILLATORTYPE_LSE;
RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
RCC_OscInitStruct.LSEState = RCC_LSE_ON;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
}
/* Enable CRS clock*/
__HAL_RCC_CRS_CLK_ENABLE();
/* Enable and set RCC/CRS Interrupt*/
HAL_NVIC_SetPriority(RCC_CRS_IRQn, 0x03, 0x00);
HAL_NVIC_EnableIRQ(RCC_CRS_IRQn);
/* Output HSI48 MCO pin(PA8) */
HAL_RCC_MCOConfig(RCC_MCO, RCC_MCO1SOURCE_HSI48, RCC_MCODIV_1);
}
/**
* @brief USB Clock Configuration: Enable Resources
* @param None
* @retval None
*/
void USBClock_Enable(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
static RCC_CRSInitTypeDef RCC_CRSInitStruct;
/* Enable HSI48 Oscillator to be used as USB clock source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48;
RCC_OscInitStruct.HSI48State = RCC_HSI48_ON;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
/* Select HSI48 as USB clock source */
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
/*Configure the clock recovery system (CRS)**********************************/
/*Enable CRS Clock*/
__HAL_RCC_CRS_CLK_ENABLE();
/* Default Synchro Signal division factor (not divided) */
RCC_CRSInitStruct.Prescaler = RCC_CRS_SYNC_DIV1;
/* Set the SYNCSRC[1:0] bits according to CRS_Source value */
RCC_CRSInitStruct.Source = RCC_CRS_SYNC_SOURCE_USB;
/* HSI48 is synchronized with USB SOF at 1KHz rate */
RCC_CRSInitStruct.ReloadValue = __HAL_RCC_CRS_RELOADVALUE_CALCULATE(48000000, 1000);
RCC_CRSInitStruct.ErrorLimitValue = RCC_CRS_ERRORLIMIT_DEFAULT;
/* Set the TRIM[5:0] to the default value*/
RCC_CRSInitStruct.HSI48CalibrationValue = 0x20;
/* Start automatic synchronization */
HAL_RCCEx_CRSConfig (&RCC_CRSInitStruct);
}
/**
* @brief System Clock Configuration
* The system Clock is configured as follow:
*
* HSI48 used as USB clock source (USE_USB_CLKSOURCE_CRSHSI48 defined in main.h)
* - System Clock source = HSI48
* - SYSCLK(Hz) = 48000000
* - HCLK(Hz) = 48000000
* - AHB Prescaler = 1
* - APB1 Prescaler = 1
* - Flash Latency(WS) = 1
*
* - PLL(HSE) used as USB clock source (USE_USB_CLKSOURCE_PLL defined in main.h)
* - System Clock source = PLL (HSE)
* - SYSCLK(Hz) = 48000000
* - HCLK(Hz) = 48000000
* - AHB Prescaler = 1
* - APB1 Prescaler = 1
* - HSE Frequency(Hz) = 8000000
* - PREDIV = 1
* - PLLMUL = 6
* - Flash Latency(WS) = 1
*
* @param None
* @retval None
*/
static void SystemClock_Config(void)
{
RCC_ClkInitTypeDef RCC_ClkInitStruct;
RCC_OscInitTypeDef RCC_OscInitStruct;
RCC_PeriphCLKInitTypeDef PeriphClkInitStruct;
#if defined (USE_USB_CLKSOURCE_CRSHSI48)
static RCC_CRSInitTypeDef RCC_CRSInitStruct;
#endif
#if defined (USE_USB_CLKSOURCE_CRSHSI48)
/* Enable HSI48 Oscillator to be used as system clock source */
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI48;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
/* Select HSI48 as USB clock source */
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_HSI48;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
/* Select HSI48 as system clock source and configure the HCLK and PCLK1
clock dividers */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_HSI48;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1);
/*Configure the clock recovery system (CRS)**********************************/
/*Enable CRS Clock*/
__HAL_RCC_CRS_CLK_ENABLE();
/* Default Synchro Signal division factor (not divided) */
RCC_CRSInitStruct.Prescaler = RCC_CRS_SYNC_DIV1;
/* Set the SYNCSRC[1:0] bits according to CRS_Source value */
RCC_CRSInitStruct.Source = RCC_CRS_SYNC_SOURCE_USB;
/* HSI48 is synchronized with USB SOF at 1KHz rate */
RCC_CRSInitStruct.ReloadValue = __HAL_RCC_CRS_CALCULATE_RELOADVALUE(48000000, 1000);
RCC_CRSInitStruct.ErrorLimitValue = RCC_CRS_ERRORLIMIT_DEFAULT;
/* Set the TRIM[5:0] to the default value*/
RCC_CRSInitStruct.HSI48CalibrationValue = 0x20;
/* Start automatic synchronization */
HAL_RCCEx_CRSConfig (&RCC_CRSInitStruct);
#elif defined (USE_USB_CLKSOURCE_PLL)
/* Enable HSE Oscillator and activate PLL with HSE as source
PLLCLK = (8 * 6) / 1) = 48 MHz */
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.PLLMUL = RCC_PLL_MUL6;
RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
HAL_RCC_OscConfig(&RCC_OscInitStruct);
/*Select PLL 48 MHz output as USB clock source */
PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_PLLCLK;
HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
/* Select PLL as system clock source and configure the HCLK and PCLK1
clock dividers */
RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1);
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1);
#endif /*USE_USB_CLKSOURCE_CRSHSI48*/
}
