/**************************************************************************** * boards/arm/stm32l4/b-l475e-iot01a/include/b-l475e-iot01a_clock.h * * Copyright (C) 2017 Gregory Nutt. All rights reserved. * * 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 NuttX 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 OWNER 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. * ****************************************************************************/ #ifndef __BOARDS_ARM_STM32L4_B_L475E_IOT01A_INCLUDE_B_L475E_IOT01A_CLOCK_H #define __BOARDS_ARM_STM32L4_B_L475E_IOT01A_INCLUDE_B_L475E_IOT01A_CLOCK_H /**************************************************************************** * Included Files ****************************************************************************/ #include #ifndef __ASSEMBLY__ # include #endif /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ /* Clocking *************************************************************************/ #if 1 # define HSI_CLOCK_CONFIG 1 /* HSI-16 clock configuration */ #elif 0 /* Make sure you installed one! */ # define HSE_CLOCK_CONFIG 1 /* HSE with 8 MHz xtal */ #else # define MSI_CLOCK_CONFIG 1 /* MSI @ 4 MHz autotrimmed via LSE */ #endif #if defined(HSI_CLOCK_CONFIG) /* The STMicro IoT board supports both HSE and LSE crystals. As shipped, the HSE * crystal (X1) is not populated. Therefore the STMicro IoT board will need to run off the * 16MHz HSI clock, or the 32khz-synced MSI, unless you install the HSE xtal. * * System Clock source : PLL (HSI) * SYSCLK(Hz) : 80000000 Determined by PLL configuration * HCLK(Hz) : 80000000 (STM32L4_RCC_CFGR_HPRE) (Max 80 MHz) * AHB Prescaler : 1 (STM32L4_RCC_CFGR_HPRE) (Max 80 MHz) * APB1 Prescaler : 1 (STM32L4_RCC_CFGR_PPRE1) (Max 80 MHz) * APB2 Prescaler : 1 (STM32L4_RCC_CFGR_PPRE2) (Max 80 MHz) * HSI Frequency(Hz) : 16000000 (nominal) * PLLM : 1 (STM32L4_PLLCFG_PLLM) * PLLN : 10 (STM32L4_PLLCFG_PLLN) * PLLP : 0 (STM32L4_PLLCFG_PLLP) * PLLQ : 0 (STM32L4_PLLCFG_PLLQ) * PLLR : 2 (STM32L4_PLLCFG_PLLR) * PLLSAI1N : 12 * PLLSAI1Q : 4 * Flash Latency(WS) : 4 * Prefetch Buffer : OFF * 48MHz for USB SDMMC OTG FS, : Doable if required using PLLSAI1 or MSI * SDIO and RNG clock */ /* HSI - 16 MHz RC factory-trimmed * LSI - 32 KHz RC (X2) * MSI - variable up to 48 MHz, synchronized to LSE * HSE - not installed (X1) * LSE - 32.768 kHz installed */ #define STM32L4_HSI_FREQUENCY 16000000ul #define STM32L4_LSI_FREQUENCY 32000 #define STM32L4_LSE_FREQUENCY 32768 #define BOARD_AHB_FREQUENCY 80000000ul #define STM32L4_BOARD_USEHSI 1 /* XXX sysclk mux = pllclk */ /* XXX pll source mux = hsi */ /* REVISIT: Trimming of the HSI and MSI is not yet supported. */ /* Main PLL Configuration. * * Formulae: * * VCO input frequency = PLL input clock frequency / PLLM, 1 <= PLLM <= 8 * VCO output frequency = VCO input frequency × PLLN, 8 <= PLLN <= 86, frequency range 64 to 344 MHz * PLL output P (SAI3) clock frequency = VCO frequency / PLLP, PLLP = 7, or 17, or 0 to disable * PLL output Q (48M1) clock frequency = VCO frequency / PLLQ, PLLQ = 2, 4, 6, or 8, or 0 to disable * PLL output R (CLK) clock frequency = VCO frequency / PLLR, PLLR = 2, 4, 6, or 8, or 0 to disable * * PLL output P is used for SAI * PLL output Q is used for OTG FS, SDMMC, RNG * PLL output R is used for SYSCLK * PLLP = 0 (not used) * PLLQ = 0 (not used) * PLLR = 2 * PLLN = 10 * PLLM = 1 * * We will configure like this * * PLL source is HSI * * PLL_REF = STM32L4_HSI_FREQUENCY / PLLM * = 16,000,000 / 1 * = 16,000,000 * * PLL_VCO = PLL_REF * PLLN * = 16,000,000 * 10 * = 160,000,000 * * PLL_CLK = PLL_VCO / PLLR * = 160,000,000 / 2 = 80,000,000 * PLL_48M1 = disabled * PLL_SAI3 = disabled * * ---------------------------------------- * * PLLSAI1 Configuration * * The clock input and M divider are identical to the main PLL. * However the multiplier and postscalers are independent. * The PLLSAI1 is configured only if CONFIG_STM32L4_SAI1PLL is defined * * SAI1VCO input frequency = PLL input clock frequency * SAI1VCO output frequency = SAI1VCO input frequency × PLLSAI1N, 8 <= PLLSAI1N <= 86, frequency range 64 to 344 MHz * SAI1PLL output P (SAI1) clock frequency = SAI1VCO frequency / PLLSAI1P, PLLP = 7, or 17, or 0 to disable * SAI1PLL output Q (48M2) clock frequency = SAI1VCO frequency / PLLSAI1Q, PLLQ = 2, 4, 6, or 8, or 0 to disable * SAI1PLL output R (ADC1) clock frequency = SAI1VCO frequency / PLLSAI1R, PLLR = 2, 4, 6, or 8, or 0 to disable * * We will configure like this * * PLLSAI1 disabled * * ---------------------------------------- * * PLLSAI2 Configuration * * The clock input and M divider are identical to the main PLL. * However the multiplier and postscalers are independent. * The PLLSAI2 is configured only if CONFIG_STM32L4_SAI2PLL is defined * * SAI2VCO input frequency = PLL input clock frequency * SAI2VCO output frequency = SAI2VCO input frequency × PLLSAI2N, 8 <= PLLSAI1N <= 86, frequency range 64 to 344 MHz * SAI2PLL output P (SAI2) clock frequency = SAI2VCO frequency / PLLSAI2P, PLLP = 7, or 17, or 0 to disable * SAI2PLL output R (ADC2) clock frequency = SAI2VCO frequency / PLLSAI2R, PLLR = 2, 4, 6, or 8, or 0 to disable * * We will configure like this * * PLLSAI2 disabled * * ---------------------------------------- * * TODO: The STM32L is a low power peripheral and all these clocks should be configurable at runtime. * * ---------------------------------------- * * TODO These clock sources can be configured in Kconfig (this is not a board feature) * USART1 * USART2 * USART3 * UART4 * UART5 * LPUART1 * I2C1 * I2C2 * I2C3 * LPTIM1 * LPTIM2 * SAI1 * SAI2 * CLK48 * ADC * SWPMI * DFSDM */ /* prescaler common to all PLL inputs; will be 1 (XXX source is implicitly as per comment above HSI) */ #define STM32L4_PLLCFG_PLLM RCC_PLLCFG_PLLM(1) /* 'main' PLL config; we use this to generate our system clock via the R * output. We set it up as 16 MHz / 1 * 10 / 2 = 80 MHz * * XXX NOTE: currently the main PLL is implicitly turned on and is implicitly * the system clock; this should be configurable since not all applications may * want things done this way. */ #define STM32L4_PLLCFG_PLLN RCC_PLLCFG_PLLN(10) #define STM32L4_PLLCFG_PLLP 0 #undef STM32L4_PLLCFG_PLLP_ENABLED #define STM32L4_PLLCFG_PLLQ RCC_PLLCFG_PLLQ_2 #define STM32L4_PLLCFG_PLLQ_ENABLED #define STM32L4_PLLCFG_PLLR RCC_PLLCFG_PLLR(2) #define STM32L4_PLLCFG_PLLR_ENABLED /* 'SAIPLL1' is used to generate the 48 MHz clock, since we can't * do that with the main PLL's N value. We set N = 12, and enable * the Q output (ultimately for CLK48) with /4. So, * 16 MHz / 1 * 12 / 4 = 48 MHz * * XXX NOTE: currently the SAIPLL /must/ be explicitly selected in the * menuconfig, or else all this is a moot point, and the various 48 MHz * peripherals will not work (RNG at present). I would suggest removing * that option from Kconfig altogether, and simply making it an option * that is selected via a #define here, like all these other params. */ #define STM32L4_PLLSAI1CFG_PLLN RCC_PLLSAI1CFG_PLLN(12) #define STM32L4_PLLSAI1CFG_PLLP 0 #undef STM32L4_PLLSAI1CFG_PLLP_ENABLED #define STM32L4_PLLSAI1CFG_PLLQ RCC_PLLSAI1CFG_PLLQ_4 #define STM32L4_PLLSAI1CFG_PLLQ_ENABLED #define STM32L4_PLLSAI1CFG_PLLR 0 #undef STM32L4_PLLSAI1CFG_PLLR_ENABLED /* 'SAIPLL2' is not used in this application */ #define STM32L4_PLLSAI2CFG_PLLN RCC_PLLSAI2CFG_PLLN(8) #define STM32L4_PLLSAI2CFG_PLLP 0 #undef STM32L4_PLLSAI2CFG_PLLP_ENABLED #define STM32L4_PLLSAI2CFG_PLLR 0 #undef STM32L4_PLLSAI2CFG_PLLR_ENABLED #define STM32L4_SYSCLK_FREQUENCY 80000000ul /* CLK48 will come from PLLSAI1 (implicitly Q) */ #define STM32L4_USE_CLK48 #define STM32L4_CLK48_SEL RCC_CCIPR_CLK48SEL_PLLSAI1 /* enable the LSE oscillator, used automatically trim the MSI, and for RTC */ #define STM32L4_USE_LSE 1 /* AHB clock (HCLK) is SYSCLK (80MHz) */ #define STM32L4_RCC_CFGR_HPRE RCC_CFGR_HPRE_SYSCLK /* HCLK = SYSCLK / 1 */ #define STM32L4_HCLK_FREQUENCY STM32L4_SYSCLK_FREQUENCY #define STM32L4_BOARD_HCLK STM32L4_HCLK_FREQUENCY /* Same as above, to satisfy compiler */ /* APB1 clock (PCLK1) is HCLK/1 (80MHz) */ #define STM32L4_RCC_CFGR_PPRE1 RCC_CFGR_PPRE1_HCLK /* PCLK1 = HCLK / 1 */ #define STM32L4_PCLK1_FREQUENCY (STM32L4_HCLK_FREQUENCY / 1) /* Timers driven from APB1 will be twice PCLK1, when * NOT define STM32L4_RCC_CFGR_PPRE1 as RCC_CFGR_PPRE1_HCLK. */ /* REVISIT : this can be configured */ #define STM32L4_APB1_TIM2_CLKIN STM32L4_PCLK1_FREQUENCY #define STM32L4_APB1_TIM3_CLKIN STM32L4_PCLK1_FREQUENCY #define STM32L4_APB1_TIM4_CLKIN STM32L4_PCLK1_FREQUENCY #define STM32L4_APB1_TIM5_CLKIN STM32L4_PCLK1_FREQUENCY #define STM32L4_APB1_TIM6_CLKIN STM32L4_PCLK1_FREQUENCY #define STM32L4_APB1_TIM7_CLKIN STM32L4_PCLK1_FREQUENCY #define STM32L4_APB1_LPTIM1_CLKIN STM32L4_PCLK1_FREQUENCY #define STM32L4_APB1_LPTIM2_CLKIN STM32L4_PCLK1_FREQUENCY /* APB2 clock (PCLK2) is HCLK (80MHz) */ #define STM32L4_RCC_CFGR_PPRE2 RCC_CFGR_PPRE2_HCLK /* PCLK2 = HCLK / 1 */ #define STM32L4_PCLK2_FREQUENCY (STM32L4_HCLK_FREQUENCY / 1) /* Timers driven from APB2 will be twice PCLK2 */ /* REVISIT : this can be configured */ #define STM32L4_APB2_TIM1_CLKIN STM32L4_PCLK2_FREQUENCY #define STM32L4_APB2_TIM8_CLKIN STM32L4_PCLK2_FREQUENCY #define STM32L4_APB2_TIM15_CLKIN STM32L4_PCLK2_FREQUENCY #define STM32L4_APB2_TIM16_CLKIN STM32L4_PCLK2_FREQUENCY #define STM32L4_APB2_TIM17_CLKIN STM32L4_PCLK2_FREQUENCY /* Timer Frequencies, if APBx is set to 1, frequency is same to APBx * otherwise frequency is 2xAPBx. * Note: TIM1,8 are on APB2, others on APB1 */ /* REVISIT : this can be configured */ /* TODO SDMMC */ #elif defined(HSE_CLOCK_CONFIG) /* Use the HSE */ #define STM32L4_BOARD_USEHSE 1 /* XXX sysclk mux = pllclk */ /* XXX pll source mux = hse */ /* Prescaler common to all PLL inputs */ #define STM32L4_PLLCFG_PLLM RCC_PLLCFG_PLLM(1) /* 'main' PLL config; we use this to generate our system clock */ #define STM32L4_PLLCFG_PLLN RCC_PLLCFG_PLLN(20) #define STM32L4_PLLCFG_PLLP 0 #undef STM32L4_PLLCFG_PLLP_ENABLED #define STM32L4_PLLCFG_PLLQ 0 #undef STM32L4_PLLCFG_PLLQ_ENABLED #define STM32L4_PLLCFG_PLLR RCC_PLLCFG_PLLR_2 #define STM32L4_PLLCFG_PLLR_ENABLED /* 'SAIPLL1' is used to generate the 48 MHz clock */ #define STM32L4_PLLSAI1CFG_PLLN RCC_PLLSAI1CFG_PLLN(12) #define STM32L4_PLLSAI1CFG_PLLP 0 #undef STM32L4_PLLSAI1CFG_PLLP_ENABLED #define STM32L4_PLLSAI1CFG_PLLQ RCC_PLLSAI1CFG_PLLQ_2 #define STM32L4_PLLSAI1CFG_PLLQ_ENABLED #define STM32L4_PLLSAI1CFG_PLLR 0 #undef STM32L4_PLLSAI1CFG_PLLR_ENABLED /* 'SAIPLL2' is not used in this application */ #define STM32L4_PLLSAI2CFG_PLLN RCC_PLLSAI2CFG_PLLN(8) #define STM32L4_PLLSAI2CFG_PLLP 0 #undef STM32L4_PLLSAI2CFG_PLLP_ENABLED #define STM32L4_PLLSAI2CFG_PLLR 0 #undef STM32L4_PLLSAI2CFG_PLLR_ENABLED #define STM32L4_SYSCLK_FREQUENCY 80000000ul /* Enable CLK48; get it from PLLSAI1 */ #define STM32L4_USE_CLK48 #define STM32L4_CLK48_SEL RCC_CCIPR_CLK48SEL_PLLSAI1 /* Enable LSE (for the RTC) */ #define STM32L4_USE_LSE 1 /* Configure the HCLK divisor (for the AHB bus, core, memory, and DMA */ #define STM32L4_RCC_CFGR_HPRE RCC_CFGR_HPRE_SYSCLK /* HCLK = SYSCLK / 1 */ #define STM32L4_HCLK_FREQUENCY STM32L4_SYSCLK_FREQUENCY #define STM32L4_BOARD_HCLK STM32L4_HCLK_FREQUENCY /* Same as above, to satisfy compiler */ /* Configure the APB1 prescaler */ #define STM32L4_RCC_CFGR_PPRE1 RCC_CFGR_PPRE1_HCLK /* PCLK1 = HCLK / 1 */ #define STM32L4_PCLK1_FREQUENCY (STM32L4_HCLK_FREQUENCY/1) #define STM32L4_APB1_TIM2_CLKIN (2*STM32L4_PCLK1_FREQUENCY) #define STM32L4_APB1_TIM3_CLKIN (2*STM32L4_PCLK1_FREQUENCY) #define STM32L4_APB1_TIM4_CLKIN (2*STM32L4_PCLK1_FREQUENCY) #define STM32L4_APB1_TIM5_CLKIN (2*STM32L4_PCLK1_FREQUENCY) #define STM32L4_APB1_TIM6_CLKIN (2*STM32L4_PCLK1_FREQUENCY) #define STM32L4_APB1_TIM7_CLKIN (2*STM32L4_PCLK1_FREQUENCY) /* Configure the APB2 prescaler */ #define STM32L4_RCC_CFGR_PPRE2 RCC_CFGR_PPRE2_HCLK /* PCLK2 = HCLK / 1 */ #define STM32L4_PCLK2_FREQUENCY (STM32L4_HCLK_FREQUENCY/1) #define STM32L4_APB2_TIM1_CLKIN (2*STM32L4_PCLK2_FREQUENCY) #define STM32L4_APB2_TIM8_CLKIN (2*STM32L4_PCLK2_FREQUENCY) #elif defined(MSI_CLOCK_CONFIG) /* Use the MSI; frequ = 4 MHz; autotrim from LSE */ #define STM32L4_BOARD_USEMSI 1 #define STM32L4_BOARD_MSIRANGE RCC_CR_MSIRANGE_4M /* XXX sysclk mux = pllclk */ /* XXX pll source mux = msi */ /* prescaler common to all PLL inputs */ #define STM32L4_PLLCFG_PLLM RCC_PLLCFG_PLLM(1) /* 'main' PLL config; we use this to generate our system clock */ #define STM32L4_PLLCFG_PLLN RCC_PLLCFG_PLLN(40) #define STM32L4_PLLCFG_PLLP 0 #undef STM32L4_PLLCFG_PLLP_ENABLED #define STM32L4_PLLCFG_PLLQ 0 #undef STM32L4_PLLCFG_PLLQ_ENABLED #define STM32L4_PLLCFG_PLLR RCC_PLLCFG_PLLR_2 #define STM32L4_PLLCFG_PLLR_ENABLED /* 'SAIPLL1' is used to generate the 48 MHz clock */ #define STM32L4_PLLSAI1CFG_PLLN RCC_PLLSAI1CFG_PLLN(24) #define STM32L4_PLLSAI1CFG_PLLP 0 #undef STM32L4_PLLSAI1CFG_PLLP_ENABLED #define STM32L4_PLLSAI1CFG_PLLQ RCC_PLLSAI1CFG_PLLQ_2 #define STM32L4_PLLSAI1CFG_PLLQ_ENABLED #define STM32L4_PLLSAI1CFG_PLLR 0 #undef STM32L4_PLLSAI1CFG_PLLR_ENABLED /* 'SAIPLL2' is not used in this application */ #define STM32L4_PLLSAI2CFG_PLLN RCC_PLLSAI2CFG_PLLN(8) #define STM32L4_PLLSAI2CFG_PLLP 0 #undef STM32L4_PLLSAI2CFG_PLLP_ENABLED #define STM32L4_PLLSAI2CFG_PLLR 0 #undef STM32L4_PLLSAI2CFG_PLLR_ENABLED #define STM32L4_SYSCLK_FREQUENCY 80000000ul /* Enable CLK48; get it from PLLSAI1 */ #define STM32L4_USE_CLK48 #define STM32L4_CLK48_SEL RCC_CCIPR_CLK48SEL_PLLSAI1 /* Enable LSE (for the RTC) */ #define STM32L4_USE_LSE 1 /* Configure the HCLK divisor (for the AHB bus, core, memory, and DMA */ #define STM32L4_RCC_CFGR_HPRE RCC_CFGR_HPRE_SYSCLK /* HCLK = SYSCLK / 1 */ #define STM32L4_HCLK_FREQUENCY STM32L4_SYSCLK_FREQUENCY #define STM32L4_BOARD_HCLK STM32L4_HCLK_FREQUENCY /* Same as above, to satisfy compiler */ /* Configure the APB1 prescaler */ #define STM32L4_RCC_CFGR_PPRE1 RCC_CFGR_PPRE1_HCLK /* PCLK1 = HCLK / 1 */ #define STM32L4_PCLK1_FREQUENCY (STM32L4_HCLK_FREQUENCY/1) #define STM32L4_APB1_TIM2_CLKIN (2*STM32L4_PCLK1_FREQUENCY) #define STM32L4_APB1_TIM3_CLKIN (2*STM32L4_PCLK1_FREQUENCY) #define STM32L4_APB1_TIM4_CLKIN (2*STM32L4_PCLK1_FREQUENCY) #define STM32L4_APB1_TIM5_CLKIN (2*STM32L4_PCLK1_FREQUENCY) #define STM32L4_APB1_TIM6_CLKIN (2*STM32L4_PCLK1_FREQUENCY) #define STM32L4_APB1_TIM7_CLKIN (2*STM32L4_PCLK1_FREQUENCY) /* Configure the APB2 prescaler */ #define STM32L4_RCC_CFGR_PPRE2 RCC_CFGR_PPRE2_HCLK /* PCLK2 = HCLK / 1 */ #define STM32L4_PCLK2_FREQUENCY (STM32L4_HCLK_FREQUENCY/1) #define STM32L4_APB2_TIM1_CLKIN (2*STM32L4_PCLK2_FREQUENCY) #define STM32L4_APB2_TIM8_CLKIN (2*STM32L4_PCLK2_FREQUENCY) #endif /* Timer Frequencies, if APBx is set to 1, frequency is same to APBx * otherwise frequency is 2xAPBx. * Note: TIM1,8,15,16,17 are on APB2, others on APB1 */ #define BOARD_TIM1_FREQUENCY STM32L4_APB2_TIM1_CLKIN #define BOARD_TIM2_FREQUENCY STM32L4_APB1_TIM2_CLKIN #define BOARD_TIM3_FREQUENCY STM32L4_APB1_TIM3_CLKIN #define BOARD_TIM4_FREQUENCY STM32L4_APB1_TIM4_CLKIN #define BOARD_TIM5_FREQUENCY STM32L4_APB1_TIM5_CLKIN #define BOARD_TIM6_FREQUENCY STM32L4_APB1_TIM6_CLKIN #define BOARD_TIM7_FREQUENCY STM32L4_APB1_TIM7_CLKIN #define BOARD_TIM8_FREQUENCY STM32L4_APB2_TIM8_CLKIN #define BOARD_TIM15_FREQUENCY STM32L4_APB2_TIM15_CLKIN #define BOARD_TIM16_FREQUENCY STM32L4_APB2_TIM16_CLKIN #define BOARD_TIM17_FREQUENCY STM32L4_APB2_TIM17_CLKIN #define BOARD_LPTIM1_FREQUENCY STM32L4_APB1_LPTIM1_CLKIN #define BOARD_LPTIM2_FREQUENCY STM32L4_APB1_LPTIM2_CLKIN /**************************************************************************** * Public Data ****************************************************************************/ #ifndef __ASSEMBLY__ #undef EXTERN #if defined(__cplusplus) #define EXTERN extern "C" extern "C" { #else #define EXTERN extern #endif /**************************************************************************** * Public Function Prototypes ****************************************************************************/ #undef EXTERN #if defined(__cplusplus) } #endif #endif /* __ASSEMBLY__ */ #endif /* __BOARDS_ARMSTM32L4__B_L475E_IOT01A_INCLUDE_B_L475E_IOT01A_CLOCK */