// This file was automatically generated by the STM Cube software // And as such, is BSD licneced from STM #include "stm32f1xx.h" #if !defined(HSI_VALUE) #define HSI_VALUE \ 8000000U /*!< Default value of the Internal oscillator in Hz. \ This value can be provided and adapted by the user application. */ #endif /* HSI_VALUE */ /*!< Uncomment the following line if you need to use external SRAM */ #if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG) /* #define DATA_IN_ExtSRAM */ #endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */ #ifndef VECT_TAB_OFFSET #error VECT_TAB_OFFSET #endif /******************************************************************************* * Clock Definitions *******************************************************************************/ #if defined(STM32F100xB) || defined(STM32F100xE) uint32_t SystemCoreClock = 24000000U; /*!< System Clock Frequency (Core Clock) */ #else /*!< HSI Selected as System Clock source */ uint32_t SystemCoreClock = 64000000U; /*!< System Clock Frequency (Core Clock) */ #endif const uint8_t AHBPrescTable[16U] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9}; const uint8_t APBPrescTable[8U] = {0, 0, 0, 0, 1, 2, 3, 4}; /** * @brief Setup the microcontroller system * Initialize the Embedded Flash Interface, the PLL and update the * SystemCoreClock variable. * @note This function should be used only after reset. * @param None * @retval None */ void SystemInit(void) { /* Reset the RCC clock configuration to the default reset state(for debug purpose) */ /* Set HSION bit */ RCC->CR |= 0x00000001U; /* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */ #if !defined(STM32F105xC) && !defined(STM32F107xC) RCC->CFGR &= 0xF8FF0000U; #else RCC->CFGR &= 0xF0FF0000U; #endif /* STM32F105xC */ /* Reset HSEON, CSSON and PLLON bits */ RCC->CR &= 0xFEF6FFFFU; /* Reset HSEBYP bit */ RCC->CR &= 0xFFFBFFFFU; /* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */ RCC->CFGR &= 0xFF80FFFFU; #if defined(STM32F105xC) || defined(STM32F107xC) /* Reset PLL2ON and PLL3ON bits */ RCC->CR &= 0xEBFFFFFFU; /* Disable all interrupts and clear pending bits */ RCC->CIR = 0x00FF0000U; /* Reset CFGR2 register */ RCC->CFGR2 = 0x00000000U; #elif defined(STM32F100xB) || defined(STM32F100xE) /* Disable all interrupts and clear pending bits */ RCC->CIR = 0x009F0000U; /* Reset CFGR2 register */ RCC->CFGR2 = 0x00000000U; #else /* Disable all interrupts and clear pending bits */ RCC->CIR = 0x009F0000U; #endif /* STM32F105xC */ #if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG) #ifdef DATA_IN_ExtSRAM SystemInit_ExtMemCtl(); #endif /* DATA_IN_ExtSRAM */ #endif #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 } /** * @brief Update SystemCoreClock variable 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 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 by the PLL factors. * * (*) HSI_VALUE is a constant defined in stm32f1xx.h file (default value * 8 MHz) but the real value may vary depending on the variations * in voltage and temperature. * * (**) HSE_VALUE is a constant defined in stm32f1xx.h file (default value * 8 MHz or 25 MHz, depending on the product used), 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 = 0U, pllmull = 0U, pllsource = 0U; #if defined(STM32F105xC) || defined(STM32F107xC) uint32_t prediv1source = 0U, prediv1factor = 0U, prediv2factor = 0U, pll2mull = 0U; #endif /* STM32F105xC */ #if defined(STM32F100xB) || defined(STM32F100xE) uint32_t prediv1factor = 0U; #endif /* STM32F100xB or STM32F100xE */ /* Get SYSCLK source -------------------------------------------------------*/ tmp = RCC->CFGR & RCC_CFGR_SWS; switch (tmp) { case 0x00U: /* HSI used as system clock */ SystemCoreClock = HSI_VALUE; break; case 0x04U: /* HSE used as system clock */ SystemCoreClock = HSE_VALUE; break; case 0x08U: /* PLL used as system clock */ /* Get PLL clock source and multiplication factor ----------------------*/ pllmull = RCC->CFGR & RCC_CFGR_PLLMULL; pllsource = RCC->CFGR & RCC_CFGR_PLLSRC; #if !defined(STM32F105xC) && !defined(STM32F107xC) pllmull = (pllmull >> 18U) + 2U; if (pllsource == 0x00U) { /* HSI oscillator clock divided by 2 selected as PLL clock entry */ SystemCoreClock = (HSI_VALUE >> 1U) * pllmull; } else { #if defined(STM32F100xB) || defined(STM32F100xE) prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1U; /* HSE oscillator clock selected as PREDIV1 clock entry */ SystemCoreClock = (HSE_VALUE / prediv1factor) * pllmull; #else /* HSE selected as PLL clock entry */ if ((RCC->CFGR & RCC_CFGR_PLLXTPRE) != (uint32_t)RESET) { /* HSE oscillator clock divided by 2 */ SystemCoreClock = (HSE_VALUE >> 1U) * pllmull; } else { SystemCoreClock = HSE_VALUE * pllmull; } #endif } #else pllmull = pllmull >> 18U; if (pllmull != 0x0DU) { pllmull += 2U; } else { /* PLL multiplication factor = PLL input clock * 6.5 */ pllmull = 13U / 2U; } if (pllsource == 0x00U) { /* HSI oscillator clock divided by 2 selected as PLL clock entry */ SystemCoreClock = (HSI_VALUE >> 1U) * pllmull; } else { /* PREDIV1 selected as PLL clock entry */ /* Get PREDIV1 clock source and division factor */ prediv1source = RCC->CFGR2 & RCC_CFGR2_PREDIV1SRC; prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1U; if (prediv1source == 0U) { /* HSE oscillator clock selected as PREDIV1 clock entry */ SystemCoreClock = (HSE_VALUE / prediv1factor) * pllmull; } else { /* PLL2 clock selected as PREDIV1 clock entry */ /* Get PREDIV2 division factor and PLL2 multiplication factor */ prediv2factor = ((RCC->CFGR2 & RCC_CFGR2_PREDIV2) >> 4U) + 1U; pll2mull = ((RCC->CFGR2 & RCC_CFGR2_PLL2MUL) >> 8U) + 2U; SystemCoreClock = (((HSE_VALUE / prediv2factor) * pll2mull) / prediv1factor) * pllmull; } } #endif /* STM32F105xC */ break; default: SystemCoreClock = HSI_VALUE; break; } /* Compute HCLK clock frequency ----------------*/ /* Get HCLK prescaler */ tmp = AHBPrescTable[((RCC->CFGR & RCC_CFGR_HPRE) >> 4U)]; /* HCLK clock frequency */ SystemCoreClock >>= tmp; } #if defined(STM32F100xE) || defined(STM32F101xE) || defined(STM32F101xG) || defined(STM32F103xE) || defined(STM32F103xG) /** * @brief Setup the external memory controller. Called in startup_stm32f1xx.s * before jump to __main * @param None * @retval None */ #ifdef DATA_IN_ExtSRAM /** * @brief Setup the external memory controller. * Called in startup_stm32f1xx_xx.s/.c before jump to main. * This function configures the external SRAM mounted on STM3210E-EVAL * board (STM32 High density devices). This SRAM will be used as program * data memory (including heap and stack). * @param None * @retval None */ void SystemInit_ExtMemCtl(void) { __IO uint32_t tmpreg; /*!< FSMC Bank1 NOR/SRAM3 is used for the STM3210E-EVAL, if another Bank is required, then adjust the Register Addresses */ /* Enable FSMC clock */ RCC->AHBENR = 0x00000114U; /* Delay after an RCC peripheral clock enabling */ tmpreg = READ_BIT(RCC->AHBENR, RCC_AHBENR_FSMCEN); /* Enable GPIOD, GPIOE, GPIOF and GPIOG clocks */ RCC->APB2ENR = 0x000001E0U; /* Delay after an RCC peripheral clock enabling */ tmpreg = READ_BIT(RCC->APB2ENR, RCC_APB2ENR_IOPDEN); (void)(tmpreg); /* --------------- SRAM Data lines, NOE and NWE configuration ---------------*/ /*---------------- SRAM Address lines configuration -------------------------*/ /*---------------- NOE and NWE configuration --------------------------------*/ /*---------------- NE3 configuration ----------------------------------------*/ /*---------------- NBL0, NBL1 configuration ---------------------------------*/ GPIOD->CRL = 0x44BB44BBU; GPIOD->CRH = 0xBBBBBBBBU; GPIOE->CRL = 0xB44444BBU; GPIOE->CRH = 0xBBBBBBBBU; GPIOF->CRL = 0x44BBBBBBU; GPIOF->CRH = 0xBBBB4444U; GPIOG->CRL = 0x44BBBBBBU; GPIOG->CRH = 0x444B4B44U; /*---------------- FSMC Configuration ---------------------------------------*/ /*---------------- Enable FSMC Bank1_SRAM Bank ------------------------------*/ FSMC_Bank1->BTCR[4U] = 0x00001091U; FSMC_Bank1->BTCR[5U] = 0x00110212U; } #endif /* DATA_IN_ExtSRAM */ #endif /* STM32F100xE || STM32F101xE || STM32F101xG || STM32F103xE || STM32F103xG */ /** * @} */ /** * @} */ /** * @} */ /************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/