/** ****************************************************************************** * @file stm32l0xx_ll_rcc.c * @author MCD Application Team * @brief RCC LL module driver. ****************************************************************************** * @attention * *

© COPYRIGHT(c) 2016 STMicroelectronics

* * Redistribution and use in source and binary forms, with or without modification, * are permitted provided that the following conditions are met: * 1. Redistributions of source code must retain the above copyright notice, * this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * 3. Neither the name of STMicroelectronics nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * ****************************************************************************** */ #if defined(USE_FULL_LL_DRIVER) /* Includes ------------------------------------------------------------------*/ #include "stm32l0xx_ll_rcc.h" #ifdef USE_FULL_ASSERT #include "stm32_assert.h" #else #define assert_param(expr) ((void)0U) #endif /* USE_FULL_ASSERT */ /** @addtogroup STM32L0xx_LL_Driver * @{ */ #if defined(RCC) /** @defgroup RCC_LL RCC * @{ */ /* Private types -------------------------------------------------------------*/ /* Private variables ---------------------------------------------------------*/ /* Private constants ---------------------------------------------------------*/ /* Private macros ------------------------------------------------------------*/ /** @addtogroup RCC_LL_Private_Macros * @{ */ #if defined(RCC_CCIPR_USART1SEL) && defined(RCC_CCIPR_USART2SEL) #define IS_LL_RCC_USART_CLKSOURCE(__VALUE__) (((__VALUE__) == LL_RCC_USART1_CLKSOURCE) \ || ((__VALUE__) == LL_RCC_USART2_CLKSOURCE)) #elif defined(RCC_CCIPR_USART1SEL) && !defined(RCC_CCIPR_USART2SEL) #define IS_LL_RCC_USART_CLKSOURCE(__VALUE__) (((__VALUE__) == LL_RCC_USART1_CLKSOURCE)) #else #define IS_LL_RCC_USART_CLKSOURCE(__VALUE__) (((__VALUE__) == LL_RCC_USART2_CLKSOURCE)) #endif /* RCC_CCIPR_USART1SEL && RCC_CCIPR_USART2SEL */ #define IS_LL_RCC_LPUART_CLKSOURCE(__VALUE__) (((__VALUE__) == LL_RCC_LPUART1_CLKSOURCE)) #if defined(RCC_CCIPR_I2C3SEL) #define IS_LL_RCC_I2C_CLKSOURCE(__VALUE__) (((__VALUE__) == LL_RCC_I2C1_CLKSOURCE) \ || ((__VALUE__) == LL_RCC_I2C3_CLKSOURCE)) #else #define IS_LL_RCC_I2C_CLKSOURCE(__VALUE__) ((__VALUE__) == LL_RCC_I2C1_CLKSOURCE) #endif /* RCC_CCIPR_I2C3SEL */ #define IS_LL_RCC_LPTIM_CLKSOURCE(__VALUE__) ((__VALUE__) == LL_RCC_LPTIM1_CLKSOURCE) #if defined(USB) #define IS_LL_RCC_USB_CLKSOURCE(__VALUE__) (((__VALUE__) == LL_RCC_USB_CLKSOURCE)) #endif /* USB */ /** * @} */ /* Private function prototypes -----------------------------------------------*/ /** @defgroup RCC_LL_Private_Functions RCC Private functions * @{ */ uint32_t RCC_GetSystemClockFreq(void); uint32_t RCC_GetHCLKClockFreq(uint32_t SYSCLK_Frequency); uint32_t RCC_GetPCLK1ClockFreq(uint32_t HCLK_Frequency); uint32_t RCC_GetPCLK2ClockFreq(uint32_t HCLK_Frequency); uint32_t RCC_PLL_GetFreqDomain_SYS(void); /** * @} */ /* Exported functions --------------------------------------------------------*/ /** @addtogroup RCC_LL_Exported_Functions * @{ */ /** @addtogroup RCC_LL_EF_Init * @{ */ /** * @brief Reset the RCC clock configuration to the default reset state. * @note The default reset state of the clock configuration is given below: * - MSI ON and used as system clock source * - HSE, HSI and PLL OFF * - AHB, APB1 and APB2 prescaler set to 1. * - CSS, MCO OFF * - All interrupts disabled * @note This function doesn't modify the configuration of the * - Peripheral clocks * - LSI, LSE and RTC clocks * @retval An ErrorStatus enumeration value: * - SUCCESS: RCC registers are de-initialized * - ERROR: not applicable */ ErrorStatus LL_RCC_DeInit(void) { uint32_t vl_mask = 0U; /* Set MSION bit */ LL_RCC_MSI_Enable(); /* Insure MSIRDY bit is set before writing default MSIRANGE value */ while (LL_RCC_MSI_IsReady() == 0U) { __NOP(); } /* Set MSIRANGE default value */ LL_RCC_MSI_SetRange(LL_RCC_MSIRANGE_5); /* Set MSITRIM bits to the reset value*/ LL_RCC_MSI_SetCalibTrimming(0U); /* Set HSITRIM bits to the reset value*/ LL_RCC_HSI_SetCalibTrimming(0x10U); /* Reset SW, HPRE, PPRE and MCOSEL bits */ vl_mask = 0xFFFFFFFFU; CLEAR_BIT(vl_mask, (RCC_CFGR_SW | RCC_CFGR_HPRE | RCC_CFGR_PPRE1 | RCC_CFGR_PPRE2 | RCC_CFGR_MCOSEL)); LL_RCC_WriteReg(CFGR, vl_mask); /* Reset HSI, HSE, PLL */ vl_mask = LL_RCC_ReadReg(CR); #if defined(RCC_CR_HSIOUTEN) CLEAR_BIT(vl_mask, RCC_CR_HSION| RCC_CR_HSIKERON| RCC_CR_HSIDIVEN | RCC_CR_HSIOUTEN | \ RCC_CR_HSEON | RCC_CR_PLLON); #else CLEAR_BIT(vl_mask, RCC_CR_HSION| RCC_CR_HSIKERON| RCC_CR_HSIDIVEN | \ RCC_CR_HSEON | RCC_CR_PLLON); #endif LL_RCC_WriteReg(CR, vl_mask); /* Delay after an RCC peripheral clock */ vl_mask = LL_RCC_ReadReg(CR); /* Reset HSEBYP bit */ LL_RCC_HSE_DisableBypass(); /* Set RCC_CR_RTCPRE to 0b00*/ CLEAR_BIT(vl_mask, RCC_CR_RTCPRE); LL_RCC_WriteReg(CR, vl_mask); /* Reset CFGR register */ LL_RCC_WriteReg(CFGR, 0x00000000U); #if defined(RCC_HSI48_SUPPORT) /* Reset CRRCR register */ LL_RCC_WriteReg(CRRCR, 0x00000000U); /* Disable HSI48 */ LL_RCC_HSI48_Disable(); #endif /*RCC_HSI48_SUPPORT*/ /* Disable all interrupts */ LL_RCC_WriteReg(CIER, 0x00000000U); return SUCCESS; } /** * @} */ /** @addtogroup RCC_LL_EF_Get_Freq * @brief Return the frequencies of different on chip clocks; System, AHB, APB1 and APB2 buses clocks * and different peripheral clocks available on the device. * @note If SYSCLK source is MSI, function returns values based on MSI clock(*) * @note If SYSCLK source is HSI, function returns values based on HSI_VALUE(**) * @note If SYSCLK source is HSE, function returns values based on HSE_VALUE(***) * @note If SYSCLK source is PLL, function returns values based on * HSI_VALUE(**) or HSE_VALUE(***) multiplied/divided by the PLL factors. * @note (*) MSI clock depends on the selected MSI range but the real value * may vary depending on the variations in voltage and temperature. * @note (**) HSI_VALUE is a defined constant but the real value may vary * depending on the variations in voltage and temperature. * @note (***) HSE_VALUE is a defined constant, user has to ensure that * HSE_VALUE is same as the real frequency of the crystal used. * Otherwise, this function may have wrong result. * @note The result of this function could be incorrect when using fractional * value for HSE crystal. * @note This function can be used by the user application to compute the * baud-rate for the communication peripherals or configure other parameters. * @{ */ /** * @brief Return the frequencies of different on chip clocks; System, AHB, APB1 and APB2 buses clocks * @note Each time SYSCLK, HCLK, PCLK1 and/or PCLK2 clock changes, this function * must be called to update structure fields. Otherwise, any * configuration based on this function will be incorrect. * @param RCC_Clocks pointer to a @ref LL_RCC_ClocksTypeDef structure which will hold the clocks frequencies * @retval None */ void LL_RCC_GetSystemClocksFreq(LL_RCC_ClocksTypeDef *RCC_Clocks) { /* Get SYSCLK frequency */ RCC_Clocks->SYSCLK_Frequency = RCC_GetSystemClockFreq(); /* HCLK clock frequency */ RCC_Clocks->HCLK_Frequency = RCC_GetHCLKClockFreq(RCC_Clocks->SYSCLK_Frequency); /* PCLK1 clock frequency */ RCC_Clocks->PCLK1_Frequency = RCC_GetPCLK1ClockFreq(RCC_Clocks->HCLK_Frequency); /* PCLK2 clock frequency */ RCC_Clocks->PCLK2_Frequency = RCC_GetPCLK2ClockFreq(RCC_Clocks->HCLK_Frequency); } /** * @brief Return USARTx clock frequency * @param USARTxSource This parameter can be one of the following values: * @arg @ref LL_RCC_USART1_CLKSOURCE * @arg @ref LL_RCC_USART2_CLKSOURCE (*) * * (*) value not defined in all devices. * @retval USART clock frequency (in Hz) * @arg @ref LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (HSI or LSE) is not ready */ uint32_t LL_RCC_GetUSARTClockFreq(uint32_t USARTxSource) { uint32_t usart_frequency = LL_RCC_PERIPH_FREQUENCY_NO; /* Check parameter */ assert_param(IS_LL_RCC_USART_CLKSOURCE(USARTxSource)); #if defined(RCC_CCIPR_USART1SEL) if (USARTxSource == LL_RCC_USART1_CLKSOURCE) { /* USART1CLK clock frequency */ switch (LL_RCC_GetUSARTClockSource(USARTxSource)) { case LL_RCC_USART1_CLKSOURCE_SYSCLK: /* USART1 Clock is System Clock */ usart_frequency = RCC_GetSystemClockFreq(); break; case LL_RCC_USART1_CLKSOURCE_HSI: /* USART1 Clock is HSI Osc. */ if (LL_RCC_HSI_IsReady()) { usart_frequency = HSI_VALUE; } break; case LL_RCC_USART1_CLKSOURCE_LSE: /* USART1 Clock is LSE Osc. */ if (LL_RCC_LSE_IsReady()) { usart_frequency = LSE_VALUE; } break; case LL_RCC_USART1_CLKSOURCE_PCLK2: /* USART1 Clock is PCLK2 */ default: usart_frequency = RCC_GetPCLK2ClockFreq(RCC_GetHCLKClockFreq(RCC_GetSystemClockFreq())); break; } } #endif /* RCC_CCIPR_USART1SEL */ #if defined(RCC_CCIPR_USART2SEL) if (USARTxSource == LL_RCC_USART2_CLKSOURCE) { /* USART2CLK clock frequency */ switch (LL_RCC_GetUSARTClockSource(USARTxSource)) { case LL_RCC_USART2_CLKSOURCE_SYSCLK: /* USART2 Clock is System Clock */ usart_frequency = RCC_GetSystemClockFreq(); break; case LL_RCC_USART2_CLKSOURCE_HSI: /* USART2 Clock is HSI Osc. */ if (LL_RCC_HSI_IsReady()) { usart_frequency = HSI_VALUE; } break; case LL_RCC_USART2_CLKSOURCE_LSE: /* USART2 Clock is LSE Osc. */ if (LL_RCC_LSE_IsReady()) { usart_frequency = LSE_VALUE; } break; case LL_RCC_USART2_CLKSOURCE_PCLK1: /* USART2 Clock is PCLK1 */ default: usart_frequency = RCC_GetPCLK1ClockFreq(RCC_GetHCLKClockFreq(RCC_GetSystemClockFreq())); break; } } #endif /* RCC_CCIPR_USART2SEL */ return usart_frequency; } /** * @brief Return I2Cx clock frequency * @param I2CxSource This parameter can be one of the following values: * @arg @ref LL_RCC_I2C1_CLKSOURCE * @arg @ref LL_RCC_I2C3_CLKSOURCE (*) * * (*) value not defined in all devices * @retval I2C clock frequency (in Hz) * @arg @ref LL_RCC_PERIPH_FREQUENCY_NO indicates that HSI oscillator is not ready */ uint32_t LL_RCC_GetI2CClockFreq(uint32_t I2CxSource) { uint32_t i2c_frequency = LL_RCC_PERIPH_FREQUENCY_NO; /* Check parameter */ assert_param(IS_LL_RCC_I2C_CLKSOURCE(I2CxSource)); /* I2C1 CLK clock frequency */ if (I2CxSource == LL_RCC_I2C1_CLKSOURCE) { switch (LL_RCC_GetI2CClockSource(I2CxSource)) { case LL_RCC_I2C1_CLKSOURCE_SYSCLK: /* I2C1 Clock is System Clock */ i2c_frequency = RCC_GetSystemClockFreq(); break; case LL_RCC_I2C1_CLKSOURCE_HSI: /* I2C1 Clock is HSI Osc. */ if (LL_RCC_HSI_IsReady()) { i2c_frequency = HSI_VALUE; } break; case LL_RCC_I2C1_CLKSOURCE_PCLK1: /* I2C1 Clock is PCLK1 */ default: i2c_frequency = RCC_GetPCLK1ClockFreq(RCC_GetHCLKClockFreq(RCC_GetSystemClockFreq())); break; } } #if defined(RCC_CCIPR_I2C3SEL) /* I2C3 CLK clock frequency */ if (I2CxSource == LL_RCC_I2C3_CLKSOURCE) { switch (LL_RCC_GetI2CClockSource(I2CxSource)) { case LL_RCC_I2C3_CLKSOURCE_SYSCLK: /* I2C3 Clock is System Clock */ i2c_frequency = RCC_GetSystemClockFreq(); break; case LL_RCC_I2C3_CLKSOURCE_HSI: /* I2C3 Clock is HSI Osc. */ if (LL_RCC_HSI_IsReady()) { i2c_frequency = HSI_VALUE; } break; case LL_RCC_I2C3_CLKSOURCE_PCLK1: /* I2C3 Clock is PCLK1 */ default: i2c_frequency = RCC_GetPCLK1ClockFreq(RCC_GetHCLKClockFreq(RCC_GetSystemClockFreq())); break; } } #endif /*RCC_CCIPR_I2C3SEL*/ return i2c_frequency; } /** * @brief Return LPUARTx clock frequency * @param LPUARTxSource This parameter can be one of the following values: * @arg @ref LL_RCC_LPUART1_CLKSOURCE * @retval LPUART clock frequency (in Hz) * @arg @ref LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (HSI or LSE) is not ready */ uint32_t LL_RCC_GetLPUARTClockFreq(uint32_t LPUARTxSource) { uint32_t lpuart_frequency = LL_RCC_PERIPH_FREQUENCY_NO; /* Check parameter */ assert_param(IS_LL_RCC_LPUART_CLKSOURCE(LPUARTxSource)); /* LPUART1CLK clock frequency */ switch (LL_RCC_GetLPUARTClockSource(LPUARTxSource)) { case LL_RCC_LPUART1_CLKSOURCE_SYSCLK: /* LPUART1 Clock is System Clock */ lpuart_frequency = RCC_GetSystemClockFreq(); break; case LL_RCC_LPUART1_CLKSOURCE_HSI: /* LPUART1 Clock is HSI Osc. */ if (LL_RCC_HSI_IsReady()) { lpuart_frequency = HSI_VALUE; } break; case LL_RCC_LPUART1_CLKSOURCE_LSE: /* LPUART1 Clock is LSE Osc. */ if (LL_RCC_LSE_IsReady()) { lpuart_frequency = LSE_VALUE; } break; case LL_RCC_LPUART1_CLKSOURCE_PCLK1: /* LPUART1 Clock is PCLK1 */ default: lpuart_frequency = RCC_GetPCLK1ClockFreq(RCC_GetHCLKClockFreq(RCC_GetSystemClockFreq())); break; } return lpuart_frequency; } /** * @brief Return LPTIMx clock frequency * @param LPTIMxSource This parameter can be one of the following values: * @arg @ref LL_RCC_LPTIM1_CLKSOURCE * @retval LPTIM clock frequency (in Hz) * @arg @ref LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (HSI or LSE) is not ready */ uint32_t LL_RCC_GetLPTIMClockFreq(uint32_t LPTIMxSource) { uint32_t lptim_frequency = LL_RCC_PERIPH_FREQUENCY_NO; /* Check parameter */ assert_param(IS_LL_RCC_LPTIM_CLKSOURCE(LPTIMxSource)); if (LPTIMxSource == LL_RCC_LPTIM1_CLKSOURCE) { /* LPTIM1CLK clock frequency */ switch (LL_RCC_GetLPTIMClockSource(LPTIMxSource)) { case LL_RCC_LPTIM1_CLKSOURCE_LSI: /* LPTIM1 Clock is LSI Osc. */ if (LL_RCC_LSI_IsReady()) { lptim_frequency = LSI_VALUE; } break; case LL_RCC_LPTIM1_CLKSOURCE_HSI: /* LPTIM1 Clock is HSI Osc. */ if (LL_RCC_HSI_IsReady()) { lptim_frequency = HSI_VALUE; } break; case LL_RCC_LPTIM1_CLKSOURCE_LSE: /* LPTIM1 Clock is LSE Osc. */ if (LL_RCC_LSE_IsReady()) { lptim_frequency = LSE_VALUE; } break; case LL_RCC_LPTIM1_CLKSOURCE_PCLK1: /* LPTIM1 Clock is PCLK1 */ default: lptim_frequency = RCC_GetPCLK1ClockFreq(RCC_GetHCLKClockFreq(RCC_GetSystemClockFreq())); break; } } return lptim_frequency; } #if defined(USB) /** * @brief Return USBx clock frequency * @param USBxSource This parameter can be one of the following values: * @arg @ref LL_RCC_USB_CLKSOURCE * @retval USB clock frequency (in Hz) * @arg @ref LL_RCC_PERIPH_FREQUENCY_NO indicates that oscillator (HSI48) or PLL is not ready * @arg @ref LL_RCC_PERIPH_FREQUENCY_NA indicates that no clock source selected */ uint32_t LL_RCC_GetUSBClockFreq(uint32_t USBxSource) { uint32_t usb_frequency = LL_RCC_PERIPH_FREQUENCY_NO; /* Check parameter */ assert_param(IS_LL_RCC_USB_CLKSOURCE(USBxSource)); /* USBCLK clock frequency */ switch (LL_RCC_GetUSBClockSource(USBxSource)) { case LL_RCC_USB_CLKSOURCE_PLL: /* PLL clock used as USB clock source */ if (LL_RCC_PLL_IsReady()) { usb_frequency = RCC_PLL_GetFreqDomain_SYS(); } break; case LL_RCC_USB_CLKSOURCE_HSI48: /* HSI48 clock used as USB clock source */ default: if (LL_RCC_HSI48_IsReady()) { usb_frequency = HSI48_VALUE; } break; } return usb_frequency; } #endif /* USB */ /** * @} */ /** * @} */ /** @addtogroup RCC_LL_Private_Functions * @{ */ /** * @brief Return SYSTEM clock frequency * @retval SYSTEM clock frequency (in Hz) */ uint32_t RCC_GetSystemClockFreq(void) { uint32_t frequency = 0U; /* Get SYSCLK source -------------------------------------------------------*/ switch (LL_RCC_GetSysClkSource()) { case LL_RCC_SYS_CLKSOURCE_STATUS_MSI: /* MSI used as system clock source */ frequency = __LL_RCC_CALC_MSI_FREQ(LL_RCC_MSI_GetRange()); break; case LL_RCC_SYS_CLKSOURCE_STATUS_HSI: /* HSI used as system clock source */ frequency = HSI_VALUE; break; case LL_RCC_SYS_CLKSOURCE_STATUS_HSE: /* HSE used as system clock source */ frequency = HSE_VALUE; break; case LL_RCC_SYS_CLKSOURCE_STATUS_PLL: /* PLL used as system clock source */ frequency = RCC_PLL_GetFreqDomain_SYS(); break; default: frequency = __LL_RCC_CALC_MSI_FREQ(LL_RCC_MSI_GetRange()); break; } return frequency; } /** * @brief Return HCLK clock frequency * @param SYSCLK_Frequency SYSCLK clock frequency * @retval HCLK clock frequency (in Hz) */ uint32_t RCC_GetHCLKClockFreq(uint32_t SYSCLK_Frequency) { /* HCLK clock frequency */ return __LL_RCC_CALC_HCLK_FREQ(SYSCLK_Frequency, LL_RCC_GetAHBPrescaler()); } /** * @brief Return PCLK1 clock frequency * @param HCLK_Frequency HCLK clock frequency * @retval PCLK1 clock frequency (in Hz) */ uint32_t RCC_GetPCLK1ClockFreq(uint32_t HCLK_Frequency) { /* PCLK1 clock frequency */ return __LL_RCC_CALC_PCLK1_FREQ(HCLK_Frequency, LL_RCC_GetAPB1Prescaler()); } /** * @brief Return PCLK2 clock frequency * @param HCLK_Frequency HCLK clock frequency * @retval PCLK2 clock frequency (in Hz) */ uint32_t RCC_GetPCLK2ClockFreq(uint32_t HCLK_Frequency) { /* PCLK2 clock frequency */ return __LL_RCC_CALC_PCLK2_FREQ(HCLK_Frequency, LL_RCC_GetAPB2Prescaler()); } /** * @brief Return PLL clock frequency used for system domain * @retval PLL clock frequency (in Hz) */ uint32_t RCC_PLL_GetFreqDomain_SYS(void) { uint32_t pllinputfreq = 0U, pllsource = 0U; /* PLL_VCO = (HSE_VALUE or HSI_VALUE / PLL divider) * PLL Multiplicator */ /* Get PLL source */ pllsource = LL_RCC_PLL_GetMainSource(); switch (pllsource) { case LL_RCC_PLLSOURCE_HSI: /* HSI used as PLL clock source */ pllinputfreq = HSI_VALUE; break; case LL_RCC_PLLSOURCE_HSE: /* HSE used as PLL clock source */ pllinputfreq = HSE_VALUE; break; default: pllinputfreq = HSI_VALUE; break; } return __LL_RCC_CALC_PLLCLK_FREQ(pllinputfreq, LL_RCC_PLL_GetMultiplicator(), LL_RCC_PLL_GetDivider()); } /** * @} */ /** * @} */ #endif /* defined(RCC) */ /** * @} */ #endif /* USE_FULL_LL_DRIVER */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/