diff options
Diffstat (limited to 'tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32L0/TARGET_NUCLEO_L053R8/system_stm32l0xx.c')
| -rw-r--r-- | tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32L0/TARGET_NUCLEO_L053R8/system_stm32l0xx.c | 469 |
1 files changed, 469 insertions, 0 deletions
diff --git a/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32L0/TARGET_NUCLEO_L053R8/system_stm32l0xx.c b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32L0/TARGET_NUCLEO_L053R8/system_stm32l0xx.c new file mode 100644 index 0000000000..f2a95c6667 --- /dev/null +++ b/tmk_core/tool/mbed/mbed-sdk/libraries/mbed/targets/cmsis/TARGET_STM/TARGET_STM32L0/TARGET_NUCLEO_L053R8/system_stm32l0xx.c @@ -0,0 +1,469 @@ +/** + ****************************************************************************** + * @file system_stm32l0xx.c + * @author MCD Application Team + * @version V1.2.0 + * @date 06-February-2015 + * @brief CMSIS Cortex-M0+ Device Peripheral Access Layer System Source File. + * + * This file provides two functions and one global variable to be called from + * user application: + * - SystemInit(): This function is called at startup just after reset and + * before branch to main program. This call is made inside + * the "startup_stm32l0xx.s" file. + * + * - SystemCoreClock variable: Contains the core clock (HCLK), it can be used + * by the user application to setup the SysTick + * timer or configure other parameters. + * + * - SystemCoreClockUpdate(): Updates the variable SystemCoreClock and must + * be called whenever the core clock is changed + * during program execution. + * + * This file configures the system clock as follows: + *----------------------------------------------------------------------------- + * System clock source | 1- PLL_HSE_EXTC | 3- PLL_HSI + * | (external 8 MHz clock) | (internal 16 MHz) + * | 2- PLL_HSE_XTAL | + * | (external 8 MHz xtal) | + *----------------------------------------------------------------------------- + * SYSCLK(MHz) | 32 | 32 + *----------------------------------------------------------------------------- + * AHBCLK (MHz) | 32 | 32 + *----------------------------------------------------------------------------- + * APB1CLK (MHz) | 32 | 32 + *----------------------------------------------------------------------------- + * APB2CLK (MHz) | 32 | 32 + *----------------------------------------------------------------------------- + * USB capable (48 MHz precise clock) | YES | YES + *----------------------------------------------------------------------------- + ****************************************************************************** + * @attention + * + * <h2><center>© COPYRIGHT(c) 2015 STMicroelectronics</center></h2> + * + * 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. + * + ****************************************************************************** + */ + +/** @addtogroup CMSIS + * @{ + */ + +/** @addtogroup stm32l0xx_system + * @{ + */ + +/** @addtogroup STM32L0xx_System_Private_Includes + * @{ + */ + +#include "stm32l0xx.h" +#include "hal_tick.h" + +#if !defined (HSE_VALUE) + #define HSE_VALUE ((uint32_t)8000000) /*!< Value of the External oscillator in Hz */ +#endif /* HSE_VALUE */ + +#if !defined (MSI_VALUE) + #define MSI_VALUE ((uint32_t)2000000) /*!< Value of the Internal oscillator in Hz*/ +#endif /* MSI_VALUE */ + +#if !defined (HSI_VALUE) + #define HSI_VALUE ((uint32_t)16000000) /*!< Value of the Internal oscillator in Hz*/ +#endif /* HSI_VALUE */ + + +/** + * @} + */ + +/** @addtogroup STM32L0xx_System_Private_TypesDefinitions + * @{ + */ + +/** + * @} + */ + +/** @addtogroup STM32L0xx_System_Private_Defines + * @{ + */ +/************************* Miscellaneous Configuration ************************/ + +/*!< 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. */ +/******************************************************************************/ +/** + * @} + */ + +/** @addtogroup STM32L0xx_System_Private_Macros + * @{ + */ + +/* Select the clock sources (other than HSI) to start with (0=OFF, 1=ON) */ +#define USE_PLL_HSE_EXTC (1) /* Use external clock */ +#define USE_PLL_HSE_XTAL (1) /* Use external xtal */ + +/** + * @} + */ + +/** @addtogroup STM32L0xx_System_Private_Variables + * @{ + */ + /* This variable is updated in three ways: + 1) by calling CMSIS function SystemCoreClockUpdate() + 2) by calling HAL API function HAL_RCC_GetHCLKFreq() + 3) each time HAL_RCC_ClockConfig() is called to configure the system clock frequency + Note: If you use this function to configure the system clock; then there + is no need to call the 2 first functions listed above, since SystemCoreClock + variable is updated automatically. + */ +uint32_t SystemCoreClock = 32000000; +const uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9}; +const uint8_t PLLMulTable[9] = {3, 4, 6, 8, 12, 16, 24, 32, 48}; + +/** + * @} + */ + +/** @addtogroup STM32L0xx_System_Private_FunctionPrototypes + * @{ + */ + +#if (USE_PLL_HSE_XTAL != 0) || (USE_PLL_HSE_EXTC != 0) +uint8_t SetSysClock_PLL_HSE(uint8_t bypass); +#endif + +uint8_t SetSysClock_PLL_HSI(void); + +/** + * @} + */ + +/** @addtogroup STM32L0xx_System_Private_Functions + * @{ + */ + +/** + * @brief Setup the microcontroller system. + * @param None + * @retval None + */ +void SystemInit (void) +{ +/*!< Set MSION bit */ + RCC->CR |= (uint32_t)0x00000100; + + /*!< Reset SW[1:0], HPRE[3:0], PPRE1[2:0], PPRE2[2:0], MCOSEL[2:0] and MCOPRE[2:0] bits */ + RCC->CFGR &= (uint32_t) 0x88FF400C; + + /*!< Reset HSION, HSIDIVEN, HSEON, CSSON and PLLON bits */ + RCC->CR &= (uint32_t)0xFEF6FFF6; + + /*!< Reset HSI48ON bit */ + RCC->CRRCR &= (uint32_t)0xFFFFFFFE; + + /*!< Reset HSEBYP bit */ + RCC->CR &= (uint32_t)0xFFFBFFFF; + + /*!< Reset PLLSRC, PLLMUL[3:0] and PLLDIV[1:0] bits */ + RCC->CFGR &= (uint32_t)0xFF02FFFF; + + /*!< 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 = FLASH_BASE | VECT_TAB_OFFSET; /* Vector Table Relocation in Internal FLASH */ +#endif + + /* Configure the Cube driver */ + SystemCoreClock = 8000000; // At this stage the HSI is used as system clock + HAL_Init(); + + /* Configure the System clock source, PLL Multiplier and Divider factors, + AHB/APBx prescalers and Flash settings */ + SetSysClock(); + + /* Reset the timer to avoid issues after the RAM initialization */ + TIM_MST_RESET_ON; + TIM_MST_RESET_OFF; +} + +/** + * @brief Update SystemCoreClock according to Clock Register Values + * The SystemCoreClock variable contains the core clock (HCLK), it can + * be used by the user application to setup the SysTick timer or configure + * other parameters. + * + * @note Each time the core clock (HCLK) changes, this function must be called + * to update SystemCoreClock variable value. Otherwise, any configuration + * based on this variable will be incorrect. + * + * @note - The system frequency computed by this function is not the real + * frequency in the chip. It is calculated based on the predefined + * constant and the selected clock source: + * + * - If SYSCLK source is MSI, SystemCoreClock will contain the MSI + * value as defined by the MSI range. + * + * - If SYSCLK source is HSI, SystemCoreClock will contain the HSI_VALUE(*) + * + * - If SYSCLK source is HSE, SystemCoreClock will contain the HSE_VALUE(**) + * + * - If SYSCLK source is PLL, SystemCoreClock will contain the HSE_VALUE(**) + * or HSI_VALUE(*) multiplied/divided by the PLL factors. + * + * (*) HSI_VALUE is a constant defined in stm32l0xx_hal.h file (default value + * 16 MHz) but the real value may vary depending on the variations + * in voltage and temperature. + * + * (**) HSE_VALUE is a constant defined in stm32l0xx_hal.h file (default value + * 8 MHz), user has to ensure that HSE_VALUE is same as the real + * frequency of the crystal used. Otherwise, this function may + * have wrong result. + * + * - The result of this function could be not correct when using fractional + * value for HSE crystal. + * @param None + * @retval None + */ +void SystemCoreClockUpdate (void) +{ + uint32_t tmp = 0, pllmul = 0, plldiv = 0, pllsource = 0, msirange = 0; + + /* Get SYSCLK source -------------------------------------------------------*/ + tmp = RCC->CFGR & RCC_CFGR_SWS; + + switch (tmp) + { + case 0x00: /* MSI used as system clock */ + msirange = (RCC->ICSCR & RCC_ICSCR_MSIRANGE) >> 13; + SystemCoreClock = (32768 * (1 << (msirange + 1))); + break; + case 0x04: /* HSI used as system clock */ + SystemCoreClock = HSI_VALUE; + break; + case 0x08: /* HSE used as system clock */ + SystemCoreClock = HSE_VALUE; + break; + case 0x0C: /* PLL used as system clock */ + /* Get PLL clock source and multiplication factor ----------------------*/ + pllmul = RCC->CFGR & RCC_CFGR_PLLMUL; + plldiv = RCC->CFGR & RCC_CFGR_PLLDIV; + pllmul = PLLMulTable[(pllmul >> 18)]; + plldiv = (plldiv >> 22) + 1; + + pllsource = RCC->CFGR & RCC_CFGR_PLLSRC; + + if (pllsource == 0x00) + { + /* HSI oscillator clock selected as PLL clock entry */ + SystemCoreClock = (((HSI_VALUE) * pllmul) / plldiv); + } + else + { + /* HSE selected as PLL clock entry */ + SystemCoreClock = (((HSE_VALUE) * pllmul) / plldiv); + } + break; + default: /* MSI used as system clock */ + msirange = (RCC->ICSCR & RCC_ICSCR_MSIRANGE) >> 13; + SystemCoreClock = (32768 * (1 << (msirange + 1))); + break; + } + /* Compute HCLK clock frequency --------------------------------------------*/ + /* Get HCLK prescaler */ + tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4)]; + /* HCLK clock frequency */ + SystemCoreClock >>= tmp; +} + +/** + * @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) +{ + /* 1- Try to start with HSE and external clock */ +#if USE_PLL_HSE_EXTC != 0 + if (SetSysClock_PLL_HSE(1) == 0) +#endif + { + /* 2- If fail try to start with HSE and external xtal */ + #if USE_PLL_HSE_XTAL != 0 + if (SetSysClock_PLL_HSE(0) == 0) + #endif + { + /* 3- If fail start with HSI clock */ + if (SetSysClock_PLL_HSI() == 0) + { + while(1) + { + // [TODO] Put something here to tell the user that a problem occured... + } + } + } + } + + /* Output clock on MCO1 pin(PA8) for debugging purpose */ + //HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_SYSCLK, RCC_MCODIV_1); + //HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSI48, RCC_MCODIV_1); +} + +#if (USE_PLL_HSE_XTAL != 0) || (USE_PLL_HSE_EXTC != 0) +/******************************************************************************/ +/* 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; + + /* Used to gain time after DeepSleep in case HSI is used */ + if (__HAL_RCC_GET_FLAG(RCC_FLAG_HSIRDY) != RESET) + { + return 0; + } + + /* The voltage scaling allows optimizing the power consumption when the device is + clocked below the maximum system frequency, to update the voltage scaling value + regarding system frequency refer to product datasheet. */ + __PWR_CLK_ENABLE(); + __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); + + /* Enable HSE and HSI48 oscillators and activate PLL with HSE as source */ + RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_HSI48; + 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.HSI48State = RCC_HSI48_ON; /* For USB and RNG clock */ + // PLLCLK = (8 MHz * 8)/2 = 32 MHz + RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; + RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSE; + RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL_8; + RCC_OscInitStruct.PLL.PLLDIV = RCC_PLLDIV_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; // 32 MHz + RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 32 MHz + RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; // 32 MHz + RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; // 32 MHz + if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) + { + return 0; // FAIL + } + + /* Output clock on MCO1 pin(PA8) for debugging purpose */ + //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 + + return 1; // OK +} +#endif + +/******************************************************************************/ +/* PLL (clocked by HSI) used as System clock source */ +/******************************************************************************/ +uint8_t SetSysClock_PLL_HSI(void) +{ + RCC_ClkInitTypeDef RCC_ClkInitStruct; + RCC_OscInitTypeDef RCC_OscInitStruct; + + /* The voltage scaling allows optimizing the power consumption when the device is + clocked below the maximum system frequency, to update the voltage scaling value + regarding system frequency refer to product datasheet. */ + __PWR_CLK_ENABLE(); + __HAL_PWR_VOLTAGESCALING_CONFIG(PWR_REGULATOR_VOLTAGE_SCALE1); + + /* Enable HSI and HSI48 oscillators and activate PLL with HSI as source */ + RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI | RCC_OSCILLATORTYPE_HSE | RCC_OSCILLATORTYPE_HSI48; + RCC_OscInitStruct.HSEState = RCC_HSE_OFF; + RCC_OscInitStruct.HSIState = RCC_HSI_ON; + RCC_OscInitStruct.HSI48State = RCC_HSI48_ON; /* For USB and RNG clock */ + // PLLCLK = (16 MHz * 4)/2 = 32 MHz + RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON; + RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI; + RCC_OscInitStruct.PLL.PLLMUL = RCC_PLLMUL_4; + RCC_OscInitStruct.PLL.PLLDIV = RCC_PLLDIV_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; // 32 MHz + RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1; // 32 MHz + RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1; // 32 MHz + RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1; // 32 MHz + if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK) + { + return 0; // FAIL + } + + /* Output clock on MCO1 pin(PA8) for debugging purpose */ + //HAL_RCC_MCOConfig(RCC_MCO1, RCC_MCO1SOURCE_HSI, RCC_MCODIV_1); // 16 MHz + + return 1; // OK +} + +/** + * @} + */ + +/** + * @} + */ + +/** + * @} + */ + +/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/ |