mbed official
mbed library sources. Supersedes mbed-src.
Dependents: Nucleo_Hello_Encoder BLE_iBeaconScan AM1805_DEMO DISCO-F429ZI_ExportTemplate1 ... more
Diff: targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L476xG/TARGET_NUCLEO_L476RG/system_clock.c
- Revision:
- 170:19eb464bc2be
- Child:
- 187:0387e8f68319
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32L4/TARGET_STM32L476xG/TARGET_NUCLEO_L476RG/system_clock.c Thu Aug 03 13:13:39 2017 +0100
@@ -0,0 +1,361 @@
+/* mbed Microcontroller Library
+* Copyright (c) 2006-2017 ARM Limited
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+* http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+
+/**
+ * This file configures the system clock as follows:
+ *-----------------------------------------------------------------------------
+ * System clock source | 1- USE_PLL_HSE_EXTC (external 8 MHz clock)
+ * | 2- USE_PLL_HSE_XTAL (external 8 MHz xtal)
+ * | 3- USE_PLL_HSI (internal 16 MHz)
+ * | 4- USE_PLL_MSI (internal 100kHz to 48 MHz)
+ *-----------------------------------------------------------------------------
+ * SYSCLK(MHz) | 80
+ * AHBCLK (MHz) | 80
+ * APB1CLK (MHz) | 80
+ * APB2CLK (MHz) | 80
+ * USB capable | YES
+ *-----------------------------------------------------------------------------
+**/
+
+#include "stm32l4xx.h"
+#include "nvic_addr.h"
+#include "mbed_assert.h"
+
+/*!< Uncomment the following line if you need to relocate your vector Table in
+ Internal SRAM. */
+/* #define VECT_TAB_SRAM */
+#define VECT_TAB_OFFSET 0x00 /*!< Vector Table base offset field.
+ This value must be a multiple of 0x200. */
+
+
+// clock source is selected with CLOCK_SOURCE in json config
+#define USE_PLL_HSE_EXTC 0x8 // Use external clock (ST Link MCO - not enabled by default)
+#define USE_PLL_HSE_XTAL 0x4 // Use external xtal (X3 on board - not provided by default)
+#define USE_PLL_HSI 0x2 // Use HSI internal clock
+#define USE_PLL_MSI 0x1 // Use MSI internal clock
+
+#define DEBUG_MCO (0) // Output the MCO on PA8 for debugging (0=OFF, 1=SYSCLK, 2=HSE, 3=HSI, 4=MSI)
+
+#if ( ((CLOCK_SOURCE) & USE_PLL_HSE_XTAL) || ((CLOCK_SOURCE) & USE_PLL_HSE_EXTC) )
+uint8_t SetSysClock_PLL_HSE(uint8_t bypass);
+#endif /* ((CLOCK_SOURCE) & USE_PLL_HSE_XTAL) || ((CLOCK_SOURCE) & USE_PLL_HSE_EXTC) */
+
+#if ((CLOCK_SOURCE) & USE_PLL_HSI)
+uint8_t SetSysClock_PLL_HSI(void);
+#endif /* ((CLOCK_SOURCE) & USE_PLL_HSI) */
+
+#if ((CLOCK_SOURCE) & USE_PLL_MSI)
+uint8_t SetSysClock_PLL_MSI(void);
+#endif /* ((CLOCK_SOURCE) & USE_PLL_MSI) */
+
+
+/**
+ * @brief Setup the microcontroller system.
+ * @param None
+ * @retval None
+ */
+
+void SystemInit(void)
+{
+ /* FPU settings ------------------------------------------------------------*/
+#if (__FPU_PRESENT == 1) && (__FPU_USED == 1)
+ SCB->CPACR |= ((3UL << 10*2)|(3UL << 11*2)); /* set CP10 and CP11 Full Access */
+#endif
+ /* Reset the RCC clock configuration to the default reset state ------------*/
+ /* Set MSION bit */
+ RCC->CR |= RCC_CR_MSION;
+
+ /* Reset CFGR register */
+ RCC->CFGR = 0x00000000;
+
+ /* Reset HSEON, CSSON , HSION, and PLLON bits */
+ RCC->CR &= (uint32_t)0xEAF6FFFF;
+
+ /* Reset PLLCFGR register */
+ RCC->PLLCFGR = 0x00001000;
+
+ /* Reset HSEBYP bit */
+ RCC->CR &= (uint32_t)0xFFFBFFFF;
+
+ /* Disable all interrupts */
+ RCC->CIER = 0x00000000;
+
+ /* Configure the Vector Table location add offset address ------------------*/
+#ifdef VECT_TAB_SRAM
+ SCB->VTOR = SRAM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */
+#else
+ SCB->VTOR = NVIC_FLASH_VECTOR_ADDRESS; /* Vector Table Relocation in Internal FLASH */
+#endif
+
+}
+
+
+/**
+ * @brief Configures the System clock source, PLL Multiplier and Divider factors,
+ * AHB/APBx prescalers and Flash settings
+ * @note This function should be called only once the RCC clock configuration
+ * is reset to the default reset state (done in SystemInit() function).
+ * @param None
+ * @retval None
+ */
+
+void SetSysClock(void)
+{
+#if ((CLOCK_SOURCE) & USE_PLL_HSE_EXTC)
+ /* 1- Try to start with HSE and external clock */
+ if (SetSysClock_PLL_HSE(1) == 0)
+#endif
+ {
+#if ((CLOCK_SOURCE) & USE_PLL_HSE_XTAL)
+ /* 2- If fail try to start with HSE and external xtal */
+ if (SetSysClock_PLL_HSE(0) == 0)
+#endif
+ {
+#if ((CLOCK_SOURCE) & USE_PLL_HSI)
+ /* 3- If fail start with HSI clock */
+ if (SetSysClock_PLL_HSI()==0)
+#endif
+ {
+#if ((CLOCK_SOURCE) & USE_PLL_MSI)
+ /* 4- If fail start with MSI clock */
+ if (SetSysClock_PLL_MSI() == 0)
+#endif
+ {
+ while(1) {
+ MBED_ASSERT(1);
+ }
+ }
+ }
+ }
+ }
+
+ // Output clock on MCO1 pin(PA8) for debugging purpose
+#if DEBUG_MCO == 1
+ HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_SYSCLK, RCC_MCODIV_1);
+#endif
+}
+
+#if ( ((CLOCK_SOURCE) & USE_PLL_HSE_XTAL) || ((CLOCK_SOURCE) & USE_PLL_HSE_EXTC) )
+/******************************************************************************/
+/* PLL (clocked by HSE) used as System clock source */
+/******************************************************************************/
+uint8_t SetSysClock_PLL_HSE(uint8_t bypass)
+{
+ RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
+ RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+ RCC_PeriphCLKInitTypeDef RCC_PeriphClkInit = {0};
+
+ // Used to gain time after DeepSleep in case HSI is used
+ if (__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) != RESET) {
+ return 0;
+ }
+
+ // Select MSI as system clock source to allow modification of the PLL configuration
+ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
+ RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
+ HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0);
+
+ // Enable HSE oscillator and activate PLL with HSE as source
+ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_HSI;
+ if (bypass == 0) {
+ RCC_OscInitStruct.HSEState = RCC_HSE_ON; // External 8 MHz xtal on OSC_IN/OSC_OUT
+ } else {
+ RCC_OscInitStruct.HSEState = RCC_HSE_BYPASS; // External 8 MHz clock on OSC_IN
+ }
+ RCC_OscInitStruct.HSIState = RCC_HSI_OFF;
+ RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; // 8 MHz
+ RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+ RCC_OscInitStruct.PLL.PLLM = 1; // VCO input clock = 8 MHz (8 MHz / 1)
+ RCC_OscInitStruct.PLL.PLLN = 20; // VCO output clock = 160 MHz (8 MHz * 20)
+ RCC_OscInitStruct.PLL.PLLP = 7; // PLLSAI3 clock = 22 MHz (160 MHz / 7)
+ RCC_OscInitStruct.PLL.PLLQ = 2;
+ RCC_OscInitStruct.PLL.PLLR = 2; // PLL clock = 80 MHz (160 MHz / 2)
+
+ if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ // Select PLL clock as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers
+ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+ RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 80 MHz or 48 MHz
+ RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 80 MHz or 48 MHz
+ RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; // 80 MHz or 48 MHz
+ RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; // 80 MHz or 48 MHz
+ if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ RCC_PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;
+ RCC_PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLLSAI1;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1Source = RCC_PLLSOURCE_HSE;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1M = 1;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1N = 12;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1P = RCC_PLLP_DIV7;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1Q = RCC_PLLQ_DIV2;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1R = RCC_PLLR_DIV2;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1ClockOut = RCC_PLLSAI1_48M2CLK;
+ if (HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphClkInit) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ // Disable MSI Oscillator
+ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
+ RCC_OscInitStruct.MSIState = RCC_MSI_OFF;
+ RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // No PLL update
+ HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+ // Output clock on MCO1 pin(PA8) for debugging purpose
+#if DEBUG_MCO == 2
+ if (bypass == 0)
+ HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSE, RCC_MCODIV_2); // 4 MHz
+ else
+ HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSE, RCC_MCODIV_1); // 8 MHz
+#endif
+
+ return 1; // OK
+}
+#endif /* ((CLOCK_SOURCE) & USE_PLL_HSE_XTAL) || ((CLOCK_SOURCE) & USE_PLL_HSE_EXTC) */
+
+#if ((CLOCK_SOURCE) & USE_PLL_HSI)
+/******************************************************************************/
+/* PLL (clocked by HSI) used as System clock source */
+/******************************************************************************/
+uint8_t SetSysClock_PLL_HSI(void)
+{
+ RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
+ RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+ RCC_PeriphCLKInitTypeDef RCC_PeriphClkInit = {0};
+
+ // Select MSI as system clock source to allow modification of the PLL configuration
+ RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_SYSCLK;
+ RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_MSI;
+ HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_0);
+
+ // Enable HSI oscillator and activate PLL with HSI as source
+ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_HSE;
+ RCC_OscInitStruct.HSEState = RCC_HSE_OFF;
+ RCC_OscInitStruct.HSIState = RCC_HSI_ON;
+ RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
+ RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+ RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI; // 16 MHz
+ RCC_OscInitStruct.PLL.PLLM = 2; // VCO input clock = 8 MHz (16 MHz / 2)
+ RCC_OscInitStruct.PLL.PLLN = 20; // VCO output clock = 160 MHz (8 MHz * 20)
+ RCC_OscInitStruct.PLL.PLLP = 7; // PLLSAI3 clock = 22 MHz (160 MHz / 7)
+ RCC_OscInitStruct.PLL.PLLQ = 2;
+ RCC_OscInitStruct.PLL.PLLR = 2; // PLL clock = 80 MHz (160 MHz / 2)
+ if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ // Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers
+ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+ RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; // 80 MHz
+ RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 80 MHz
+ RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; // 80 MHz
+ RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; // 80 MHz
+ if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ RCC_PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USB;
+ RCC_PeriphClkInit.UsbClockSelection = RCC_USBCLKSOURCE_PLLSAI1;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1Source = RCC_PLLSOURCE_HSI;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1M = 2;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1N = 12;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1P = RCC_PLLP_DIV7;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1Q = RCC_PLLQ_DIV2;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1R = RCC_PLLR_DIV2;
+ RCC_PeriphClkInit.PLLSAI1.PLLSAI1ClockOut = RCC_PLLSAI1_48M2CLK;
+ if (HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphClkInit) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ // Disable MSI Oscillator
+ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI;
+ RCC_OscInitStruct.MSIState = RCC_MSI_OFF;
+ RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // No PLL update
+ HAL_RCC_OscConfig(&RCC_OscInitStruct);
+
+ // Output clock on MCO1 pin(PA8) for debugging purpose
+#if DEBUG_MCO == 3
+ HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSI, RCC_MCODIV_1); // 16 MHz
+#endif
+
+ return 1; // OK
+}
+#endif /* ((CLOCK_SOURCE) & USE_PLL_HSI) */
+
+#if ((CLOCK_SOURCE) & USE_PLL_MSI)
+/******************************************************************************/
+/* PLL (clocked by MSI) used as System clock source */
+/******************************************************************************/
+uint8_t SetSysClock_PLL_MSI(void)
+{
+ RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
+ RCC_OscInitTypeDef RCC_OscInitStruct = {0};
+ RCC_PeriphCLKInitTypeDef PeriphClkInitStruct = {0};
+
+ // Enable LSE Oscillator to automatically calibrate the MSI clock
+ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE;
+ RCC_OscInitStruct.PLL.PLLState = RCC_PLL_NONE; // No PLL update
+ RCC_OscInitStruct.LSEState = RCC_LSE_ON; // External 32.768 kHz clock on OSC_IN/OSC_OUT
+ if (HAL_RCC_OscConfig(&RCC_OscInitStruct) == HAL_OK) {
+ RCC->CR |= RCC_CR_MSIPLLEN; // Enable MSI PLL-mode
+ }
+
+ HAL_RCCEx_DisableLSECSS();
+ /* Enable MSI Oscillator and activate PLL with MSI as source */
+ RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_MSI | RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_HSE;
+ RCC_OscInitStruct.MSIState = RCC_MSI_ON;
+ RCC_OscInitStruct.HSEState = RCC_HSE_OFF;
+ RCC_OscInitStruct.HSIState = RCC_HSI_OFF;
+
+ RCC_OscInitStruct.MSICalibrationValue = RCC_MSICALIBRATION_DEFAULT;
+ RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_11; /* 48 MHz */
+ RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
+ RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
+ RCC_OscInitStruct.PLL.PLLM = 6; /* 8 MHz */
+ RCC_OscInitStruct.PLL.PLLN = 40; /* 320 MHz */
+ RCC_OscInitStruct.PLL.PLLP = 7; /* 45 MHz */
+ RCC_OscInitStruct.PLL.PLLQ = 4; /* 80 MHz */
+ RCC_OscInitStruct.PLL.PLLR = 4; /* 80 MHz */
+ if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+ return 0; // FAIL
+ }
+ /* Enable MSI Auto-calibration through LSE */
+ HAL_RCCEx_EnableMSIPLLMode();
+ /* Select MSI output as USB clock source */
+ PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_USB;
+ PeriphClkInitStruct.UsbClockSelection = RCC_USBCLKSOURCE_MSI; /* 48 MHz */
+ HAL_RCCEx_PeriphCLKConfig(&PeriphClkInitStruct);
+ // Select PLL as system clock source and configure the HCLK, PCLK1 and PCLK2 clocks dividers
+ RCC_ClkInitStruct.ClockType = (RCC_CLOCKTYPE_SYSCLK | RCC_CLOCKTYPE_HCLK | RCC_CLOCKTYPE_PCLK1 | RCC_CLOCKTYPE_PCLK2);
+ RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK; /* 80 MHz */
+ RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; /* 80 MHz */
+ RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; /* 80 MHz */
+ RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; /* 80 MHz */
+ if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK) {
+ return 0; // FAIL
+ }
+
+ // Output clock on MCO1 pin(PA8) for debugging purpose
+#if DEBUG_MCO == 4
+ HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_MSI, RCC_MCODIV_2); // 2 MHz
+#endif
+
+ return 1; // OK
+}
+#endif /* ((CLOCK_SOURCE) & USE_PLL_MSI) */
