Diff: targets/TARGET_STM/TARGET_STM32F7/TARGET_STM32F746xG/TARGET_DISCO_F746NG/system_clock.c

Revision:

170:19eb464bc2be

Child:

182:a56a73fd2a6f

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/targets/TARGET_STM/TARGET_STM32F7/TARGET_STM32F746xG/TARGET_DISCO_F746NG/system_clock.c	Thu Aug 03 13:13:39 2017 +0100
@@ -0,0 +1,250 @@
+/* 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 25 MHz clock)
+  *                       | 2- USE_PLL_HSE_XTAL (external 25 MHz xtal)
+  *                       | 3- USE_PLL_HSI (internal 16 MHz clock)
+  *--------------------------------------------------------------------
+  * SYSCLK(MHz)           |            216
+  * AHBCLK (MHz)          |            216
+  * APB1CLK (MHz)         |             54
+  * APB2CLK (MHz)         |            108
+  * USB capable (48 MHz)  |            YES
+  *--------------------------------------------------------------------
+**/
+
+#include "stm32f7xx.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)
+#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
+
+#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) */
+
+
+/**
+  * @brief  Setup the microcontroller system
+  *         Initialize the Embedded Flash Interface, the PLL and update the
+  *         SystemFrequency variable.
+  * @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 HSION bit */
+    RCC->CR |= (uint32_t)0x00000001;
+
+    /* Reset CFGR register */
+    RCC->CFGR = 0x00000000;
+
+    /* Reset HSEON, CSSON and PLLON bits */
+    RCC->CR &= (uint32_t)0xFEF6FFFF;
+
+    /* Reset PLLCFGR register */
+    RCC->PLLCFGR = 0x24003010;
+
+    /* Reset HSEBYP bit */
+    RCC->CR &= (uint32_t)0xFFFBFFFF;
+
+    /* Disable all interrupts */
+    RCC->CIR = 0x00000000;
+
+#if defined (DATA_IN_ExtSRAM) || defined (DATA_IN_ExtSDRAM)
+    SystemInit_ExtMemCtl();
+#endif /* DATA_IN_ExtSRAM || DATA_IN_ExtSDRAM */
+
+    /* Configure the Vector Table location add offset address ------------------*/
+#ifdef VECT_TAB_SRAM
+    SCB->VTOR = RAMDTCM_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal SRAM */
+#else
+    SCB->VTOR = FLASH_BASE | VECT_TAB_OFFSET; /* 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
+            {
+                while(1) {
+                    MBED_ASSERT(1);
+                }
+            }
+        }
+    }
+
+    // Output clock on MCO2 pin(PC9) for debugging purpose
+    // Can be visualized on uSD card CN3 connector pin 8
+    //HAL_RCC_MCOConfig(RCC_MCO2, RCC_MCO2SOURCE_SYSCLK, RCC_MCODIV_4); // 216 MHz / 4 = 54 MHz
+}
+
+#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;
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+    RCC_PeriphCLKInitTypeDef RCC_PeriphClkInitStruct;
+
+    // Enable power clock
+    __PWR_CLK_ENABLE();
+    __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1);
+
+    // Enable HSE oscillator and activate PLL with HSE as source
+    RCC_OscInitStruct.OscillatorType      = RCC_OSCILLATORTYPE_HSE;
+    if (bypass == 0) {
+        RCC_OscInitStruct.HSEState          = RCC_HSE_ON; /* External xtal on OSC_IN/OSC_OUT */
+    } else {
+        RCC_OscInitStruct.HSEState          = RCC_HSE_BYPASS; /* External clock on OSC_IN */
+    }
+    // Warning: this configuration is for a 25 MHz xtal clock only
+    RCC_OscInitStruct.PLL.PLLState        = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource       = RCC_PLLSOURCE_HSE;
+    RCC_OscInitStruct.PLL.PLLM            = 25;            // VCO input clock = 1 MHz (25 MHz / 25)
+    RCC_OscInitStruct.PLL.PLLN            = 432;           // VCO output clock = 432 MHz (1 MHz * 432)
+    RCC_OscInitStruct.PLL.PLLP            = RCC_PLLP_DIV2; // PLLCLK = 216 MHz (432 MHz / 2)
+    RCC_OscInitStruct.PLL.PLLQ            = 9;             // USB clock = 48 MHz (432 MHz / 9) --> OK for USB
+
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    // Activate the OverDrive to reach the 216 MHz Frequency
+    if (HAL_PWREx_EnableOverDrive() != 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; // 216 MHz
+    RCC_ClkInitStruct.AHBCLKDivider  = RCC_SYSCLK_DIV1;         // 216 MHz
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;           //  54 MHz
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;           // 108 MHz
+
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    RCC_PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_CLK48;
+    RCC_PeriphClkInitStruct.Clk48ClockSelection = RCC_CLK48SOURCE_PLL;
+    if (HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphClkInitStruct) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    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;
+    RCC_OscInitTypeDef RCC_OscInitStruct;
+    RCC_PeriphCLKInitTypeDef RCC_PeriphClkInitStruct;
+
+    // Enable power clock
+    __PWR_CLK_ENABLE();
+
+    // Enable HSI oscillator and activate PLL with HSI as source
+    RCC_OscInitStruct.OscillatorType      = RCC_OSCILLATORTYPE_HSI;
+    RCC_OscInitStruct.HSIState            = RCC_HSI_ON;
+    RCC_OscInitStruct.HSEState            = RCC_HSE_OFF;
+    RCC_OscInitStruct.HSICalibrationValue = 16;
+    RCC_OscInitStruct.PLL.PLLState        = RCC_PLL_ON;
+    RCC_OscInitStruct.PLL.PLLSource       = RCC_PLLSOURCE_HSI;
+    RCC_OscInitStruct.PLL.PLLM            = 8;            // VCO input clock = 2 MHz (16 MHz / 8)
+    RCC_OscInitStruct.PLL.PLLN            = 216;           // VCO output clock = 432 MHz (2 MHz * 216)
+    RCC_OscInitStruct.PLL.PLLP            = RCC_PLLP_DIV2; // PLLCLK = 216 MHz (432 MHz / 2)
+    RCC_OscInitStruct.PLL.PLLQ            = 9;
+
+    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    // Activate the OverDrive to reach the 216 MHz Frequency
+    if (HAL_PWREx_EnableOverDrive() != 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; // 216 MHz
+    RCC_ClkInitStruct.AHBCLKDivider  = RCC_SYSCLK_DIV1;         // 216 MHz
+    RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV4;           //  54 MHz
+    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV2;           // 108 MHz
+
+    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_7) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    RCC_PeriphClkInitStruct.PeriphClockSelection = RCC_PERIPHCLK_CLK48;
+    RCC_PeriphClkInitStruct.Clk48ClockSelection = RCC_CLK48SOURCE_PLL;
+    if (HAL_RCCEx_PeriphCLKConfig(&RCC_PeriphClkInitStruct) != HAL_OK) {
+        return 0; // FAIL
+    }
+
+    return 1; // OK
+}
+#endif /* ((CLOCK_SOURCE) & USE_PLL_HSI) */