Mercurial > ~darius > hgwebdir.cgi > stm32temp
diff libs/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Template/system_stm32f10x.c @ 0:c59513fd84fb
Initial commit of STM32 test code.
| author | Daniel O'Connor <darius@dons.net.au> |
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| date | Mon, 03 Oct 2011 21:19:15 +1030 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/libs/STM32F10x_StdPeriph_Lib_V3.5.0/Project/STM32F10x_StdPeriph_Template/system_stm32f10x.c Mon Oct 03 21:19:15 2011 +1030 @@ -0,0 +1,1094 @@ +/** + ****************************************************************************** + * @file system_stm32f10x.c + * @author MCD Application Team + * @version V3.5.0 + * @date 08-April-2011 + * @brief CMSIS Cortex-M3 Device Peripheral Access Layer System Source File. + * + * 1. This file provides two functions and one global variable to be called from + * user application: + * - SystemInit(): Setups the system clock (System clock source, PLL Multiplier + * factors, AHB/APBx prescalers and Flash settings). + * This function is called at startup just after reset and + * before branch to main program. This call is made inside + * the "startup_stm32f10x_xx.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. + * + * 2. After each device reset the HSI (8 MHz) is used as system clock source. + * Then SystemInit() function is called, in "startup_stm32f10x_xx.s" file, to + * configure the system clock before to branch to main program. + * + * 3. If the system clock source selected by user fails to startup, the SystemInit() + * function will do nothing and HSI still used as system clock source. User can + * add some code to deal with this issue inside the SetSysClock() function. + * + * 4. The default value of HSE crystal is set to 8 MHz (or 25 MHz, depedning on + * the product used), refer to "HSE_VALUE" define in "stm32f10x.h" file. + * When HSE is used as system clock source, directly or through PLL, and you + * are using different crystal you have to adapt the HSE value to your own + * configuration. + * + ****************************************************************************** + * @attention + * + * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS + * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE + * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY + * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING + * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE + * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS. + * + * <h2><center>© COPYRIGHT 2011 STMicroelectronics</center></h2> + ****************************************************************************** + */ + +/** @addtogroup CMSIS + * @{ + */ + +/** @addtogroup stm32f10x_system + * @{ + */ + +/** @addtogroup STM32F10x_System_Private_Includes + * @{ + */ + +#include "stm32f10x.h" + +/** + * @} + */ + +/** @addtogroup STM32F10x_System_Private_TypesDefinitions + * @{ + */ + +/** + * @} + */ + +/** @addtogroup STM32F10x_System_Private_Defines + * @{ + */ + +/*!< Uncomment the line corresponding to the desired System clock (SYSCLK) + frequency (after reset the HSI is used as SYSCLK source) + + IMPORTANT NOTE: + ============== + 1. After each device reset the HSI is used as System clock source. + + 2. Please make sure that the selected System clock doesn't exceed your device's + maximum frequency. + + 3. If none of the define below is enabled, the HSI is used as System clock + source. + + 4. The System clock configuration functions provided within this file assume that: + - For Low, Medium and High density Value line devices an external 8MHz + crystal is used to drive the System clock. + - For Low, Medium and High density devices an external 8MHz crystal is + used to drive the System clock. + - For Connectivity line devices an external 25MHz crystal is used to drive + the System clock. + If you are using different crystal you have to adapt those functions accordingly. + */ + +#if defined (STM32F10X_LD_VL) || (defined STM32F10X_MD_VL) || (defined STM32F10X_HD_VL) +/* #define SYSCLK_FREQ_HSE HSE_VALUE */ + #define SYSCLK_FREQ_24MHz 24000000 +#else +/* #define SYSCLK_FREQ_HSE HSE_VALUE */ +/* #define SYSCLK_FREQ_24MHz 24000000 */ +/* #define SYSCLK_FREQ_36MHz 36000000 */ +/* #define SYSCLK_FREQ_48MHz 48000000 */ +/* #define SYSCLK_FREQ_56MHz 56000000 */ +#define SYSCLK_FREQ_72MHz 72000000 +#endif + +/*!< Uncomment the following line if you need to use external SRAM mounted + on STM3210E-EVAL board (STM32 High density and XL-density devices) or on + STM32100E-EVAL board (STM32 High-density value line devices) as data memory */ +#if defined (STM32F10X_HD) || (defined STM32F10X_XL) || (defined STM32F10X_HD_VL) +/* #define DATA_IN_ExtSRAM */ +#endif + +/*!< Uncomment the following line if you need to relocate your vector Table in + Internal SRAM. */ +/* #define VECT_TAB_SRAM */ +#define VECT_TAB_OFFSET 0x0 /*!< Vector Table base offset field. + This value must be a multiple of 0x200. */ + + +/** + * @} + */ + +/** @addtogroup STM32F10x_System_Private_Macros + * @{ + */ + +/** + * @} + */ + +/** @addtogroup STM32F10x_System_Private_Variables + * @{ + */ + +/******************************************************************************* +* Clock Definitions +*******************************************************************************/ +#ifdef SYSCLK_FREQ_HSE + uint32_t SystemCoreClock = SYSCLK_FREQ_HSE; /*!< System Clock Frequency (Core Clock) */ +#elif defined SYSCLK_FREQ_24MHz + uint32_t SystemCoreClock = SYSCLK_FREQ_24MHz; /*!< System Clock Frequency (Core Clock) */ +#elif defined SYSCLK_FREQ_36MHz + uint32_t SystemCoreClock = SYSCLK_FREQ_36MHz; /*!< System Clock Frequency (Core Clock) */ +#elif defined SYSCLK_FREQ_48MHz + uint32_t SystemCoreClock = SYSCLK_FREQ_48MHz; /*!< System Clock Frequency (Core Clock) */ +#elif defined SYSCLK_FREQ_56MHz + uint32_t SystemCoreClock = SYSCLK_FREQ_56MHz; /*!< System Clock Frequency (Core Clock) */ +#elif defined SYSCLK_FREQ_72MHz + uint32_t SystemCoreClock = SYSCLK_FREQ_72MHz; /*!< System Clock Frequency (Core Clock) */ +#else /*!< HSI Selected as System Clock source */ + uint32_t SystemCoreClock = HSI_VALUE; /*!< System Clock Frequency (Core Clock) */ +#endif + +__I uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9}; +/** + * @} + */ + +/** @addtogroup STM32F10x_System_Private_FunctionPrototypes + * @{ + */ + +static void SetSysClock(void); + +#ifdef SYSCLK_FREQ_HSE + static void SetSysClockToHSE(void); +#elif defined SYSCLK_FREQ_24MHz + static void SetSysClockTo24(void); +#elif defined SYSCLK_FREQ_36MHz + static void SetSysClockTo36(void); +#elif defined SYSCLK_FREQ_48MHz + static void SetSysClockTo48(void); +#elif defined SYSCLK_FREQ_56MHz + static void SetSysClockTo56(void); +#elif defined SYSCLK_FREQ_72MHz + static void SetSysClockTo72(void); +#endif + +#ifdef DATA_IN_ExtSRAM + static void SystemInit_ExtMemCtl(void); +#endif /* DATA_IN_ExtSRAM */ + +/** + * @} + */ + +/** @addtogroup STM32F10x_System_Private_Functions + * @{ + */ + +/** + * @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 |= (uint32_t)0x00000001; + + /* Reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */ +#ifndef STM32F10X_CL + RCC->CFGR &= (uint32_t)0xF8FF0000; +#else + RCC->CFGR &= (uint32_t)0xF0FF0000; +#endif /* STM32F10X_CL */ + + /* Reset HSEON, CSSON and PLLON bits */ + RCC->CR &= (uint32_t)0xFEF6FFFF; + + /* Reset HSEBYP bit */ + RCC->CR &= (uint32_t)0xFFFBFFFF; + + /* Reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */ + RCC->CFGR &= (uint32_t)0xFF80FFFF; + +#ifdef STM32F10X_CL + /* Reset PLL2ON and PLL3ON bits */ + RCC->CR &= (uint32_t)0xEBFFFFFF; + + /* Disable all interrupts and clear pending bits */ + RCC->CIR = 0x00FF0000; + + /* Reset CFGR2 register */ + RCC->CFGR2 = 0x00000000; +#elif defined (STM32F10X_LD_VL) || defined (STM32F10X_MD_VL) || (defined STM32F10X_HD_VL) + /* Disable all interrupts and clear pending bits */ + RCC->CIR = 0x009F0000; + + /* Reset CFGR2 register */ + RCC->CFGR2 = 0x00000000; +#else + /* Disable all interrupts and clear pending bits */ + RCC->CIR = 0x009F0000; +#endif /* STM32F10X_CL */ + +#if defined (STM32F10X_HD) || (defined STM32F10X_XL) || (defined STM32F10X_HD_VL) + #ifdef DATA_IN_ExtSRAM + SystemInit_ExtMemCtl(); + #endif /* DATA_IN_ExtSRAM */ +#endif + + /* Configure the System clock frequency, HCLK, PCLK2 and PCLK1 prescalers */ + /* Configure the Flash Latency cycles and enable prefetch buffer */ + SetSysClock(); + +#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, depedning 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 = 0, pllmull = 0, pllsource = 0; + +#ifdef STM32F10X_CL + uint32_t prediv1source = 0, prediv1factor = 0, prediv2factor = 0, pll2mull = 0; +#endif /* STM32F10X_CL */ + +#if defined (STM32F10X_LD_VL) || defined (STM32F10X_MD_VL) || (defined STM32F10X_HD_VL) + uint32_t prediv1factor = 0; +#endif /* STM32F10X_LD_VL or STM32F10X_MD_VL or STM32F10X_HD_VL */ + + /* Get SYSCLK source -------------------------------------------------------*/ + tmp = RCC->CFGR & RCC_CFGR_SWS; + + switch (tmp) + { + case 0x00: /* HSI used as system clock */ + SystemCoreClock = HSI_VALUE; + break; + case 0x04: /* HSE used as system clock */ + SystemCoreClock = HSE_VALUE; + break; + case 0x08: /* PLL used as system clock */ + + /* Get PLL clock source and multiplication factor ----------------------*/ + pllmull = RCC->CFGR & RCC_CFGR_PLLMULL; + pllsource = RCC->CFGR & RCC_CFGR_PLLSRC; + +#ifndef STM32F10X_CL + pllmull = ( pllmull >> 18) + 2; + + if (pllsource == 0x00) + { + /* HSI oscillator clock divided by 2 selected as PLL clock entry */ + SystemCoreClock = (HSI_VALUE >> 1) * pllmull; + } + else + { + #if defined (STM32F10X_LD_VL) || defined (STM32F10X_MD_VL) || (defined STM32F10X_HD_VL) + prediv1factor = (RCC->CFGR2 & RCC_CFGR2_PREDIV1) + 1; + /* 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 >> 1) * pllmull; + } + else + { + SystemCoreClock = HSE_VALUE * pllmull; + } + #endif + } +#else + pllmull = pllmull >> 18; + + if (pllmull != 0x0D) + { + pllmull += 2; + } + else + { /* PLL multiplication factor = PLL input clock * 6.5 */ + pllmull = 13 / 2; + } + + if (pllsource == 0x00) + { + /* HSI oscillator clock divided by 2 selected as PLL clock entry */ + SystemCoreClock = (HSI_VALUE >> 1) * 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) + 1; + + if (prediv1source == 0) + { + /* 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) >> 4) + 1; + pll2mull = ((RCC->CFGR2 & RCC_CFGR2_PLL2MUL) >> 8 ) + 2; + SystemCoreClock = (((HSE_VALUE / prediv2factor) * pll2mull) / prediv1factor) * pllmull; + } + } +#endif /* STM32F10X_CL */ + break; + + default: + SystemCoreClock = HSI_VALUE; + 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 frequency, HCLK, PCLK2 and PCLK1 prescalers. + * @param None + * @retval None + */ +static void SetSysClock(void) +{ +#ifdef SYSCLK_FREQ_HSE + SetSysClockToHSE(); +#elif defined SYSCLK_FREQ_24MHz + SetSysClockTo24(); +#elif defined SYSCLK_FREQ_36MHz + SetSysClockTo36(); +#elif defined SYSCLK_FREQ_48MHz + SetSysClockTo48(); +#elif defined SYSCLK_FREQ_56MHz + SetSysClockTo56(); +#elif defined SYSCLK_FREQ_72MHz + SetSysClockTo72(); +#endif + + /* If none of the define above is enabled, the HSI is used as System clock + source (default after reset) */ +} + +/** + * @brief Setup the external memory controller. Called in startup_stm32f10x.s + * before jump to __main + * @param None + * @retval None + */ +#ifdef DATA_IN_ExtSRAM +/** + * @brief Setup the external memory controller. + * Called in startup_stm32f10x_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) +{ +/*!< 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 = 0x00000114; + + /* Enable GPIOD, GPIOE, GPIOF and GPIOG clocks */ + RCC->APB2ENR = 0x000001E0; + +/* --------------- SRAM Data lines, NOE and NWE configuration ---------------*/ +/*---------------- SRAM Address lines configuration -------------------------*/ +/*---------------- NOE and NWE configuration --------------------------------*/ +/*---------------- NE3 configuration ----------------------------------------*/ +/*---------------- NBL0, NBL1 configuration ---------------------------------*/ + + GPIOD->CRL = 0x44BB44BB; + GPIOD->CRH = 0xBBBBBBBB; + + GPIOE->CRL = 0xB44444BB; + GPIOE->CRH = 0xBBBBBBBB; + + GPIOF->CRL = 0x44BBBBBB; + GPIOF->CRH = 0xBBBB4444; + + GPIOG->CRL = 0x44BBBBBB; + GPIOG->CRH = 0x44444B44; + +/*---------------- FSMC Configuration ---------------------------------------*/ +/*---------------- Enable FSMC Bank1_SRAM Bank ------------------------------*/ + + FSMC_Bank1->BTCR[4] = 0x00001011; + FSMC_Bank1->BTCR[5] = 0x00000200; +} +#endif /* DATA_IN_ExtSRAM */ + +#ifdef SYSCLK_FREQ_HSE +/** + * @brief Selects HSE as System clock source and configure HCLK, PCLK2 + * and PCLK1 prescalers. + * @note This function should be used only after reset. + * @param None + * @retval None + */ +static void SetSysClockToHSE(void) +{ + __IO uint32_t StartUpCounter = 0, HSEStatus = 0; + + /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/ + /* Enable HSE */ + RCC->CR |= ((uint32_t)RCC_CR_HSEON); + + /* Wait till HSE is ready and if Time out is reached exit */ + do + { + HSEStatus = RCC->CR & RCC_CR_HSERDY; + StartUpCounter++; + } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT)); + + if ((RCC->CR & RCC_CR_HSERDY) != RESET) + { + HSEStatus = (uint32_t)0x01; + } + else + { + HSEStatus = (uint32_t)0x00; + } + + if (HSEStatus == (uint32_t)0x01) + { + +#if !defined STM32F10X_LD_VL && !defined STM32F10X_MD_VL && !defined STM32F10X_HD_VL + /* Enable Prefetch Buffer */ + FLASH->ACR |= FLASH_ACR_PRFTBE; + + /* Flash 0 wait state */ + FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY); + +#ifndef STM32F10X_CL + FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0; +#else + if (HSE_VALUE <= 24000000) + { + FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0; + } + else + { + FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1; + } +#endif /* STM32F10X_CL */ +#endif + + /* HCLK = SYSCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; + + /* PCLK2 = HCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; + + /* PCLK1 = HCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1; + + /* Select HSE as system clock source */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); + RCC->CFGR |= (uint32_t)RCC_CFGR_SW_HSE; + + /* Wait till HSE is used as system clock source */ + while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x04) + { + } + } + else + { /* If HSE fails to start-up, the application will have wrong clock + configuration. User can add here some code to deal with this error */ + } +} +#elif defined SYSCLK_FREQ_24MHz +/** + * @brief Sets System clock frequency to 24MHz and configure HCLK, PCLK2 + * and PCLK1 prescalers. + * @note This function should be used only after reset. + * @param None + * @retval None + */ +static void SetSysClockTo24(void) +{ + __IO uint32_t StartUpCounter = 0, HSEStatus = 0; + + /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/ + /* Enable HSE */ + RCC->CR |= ((uint32_t)RCC_CR_HSEON); + + /* Wait till HSE is ready and if Time out is reached exit */ + do + { + HSEStatus = RCC->CR & RCC_CR_HSERDY; + StartUpCounter++; + } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT)); + + if ((RCC->CR & RCC_CR_HSERDY) != RESET) + { + HSEStatus = (uint32_t)0x01; + } + else + { + HSEStatus = (uint32_t)0x00; + } + + if (HSEStatus == (uint32_t)0x01) + { +#if !defined STM32F10X_LD_VL && !defined STM32F10X_MD_VL && !defined STM32F10X_HD_VL + /* Enable Prefetch Buffer */ + FLASH->ACR |= FLASH_ACR_PRFTBE; + + /* Flash 0 wait state */ + FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY); + FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_0; +#endif + + /* HCLK = SYSCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; + + /* PCLK2 = HCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; + + /* PCLK1 = HCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1; + +#ifdef STM32F10X_CL + /* Configure PLLs ------------------------------------------------------*/ + /* PLL configuration: PLLCLK = PREDIV1 * 6 = 24 MHz */ + RCC->CFGR &= (uint32_t)~(RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL); + RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLSRC_PREDIV1 | + RCC_CFGR_PLLMULL6); + + /* PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */ + /* PREDIV1 configuration: PREDIV1CLK = PLL2 / 10 = 4 MHz */ + RCC->CFGR2 &= (uint32_t)~(RCC_CFGR2_PREDIV2 | RCC_CFGR2_PLL2MUL | + RCC_CFGR2_PREDIV1 | RCC_CFGR2_PREDIV1SRC); + RCC->CFGR2 |= (uint32_t)(RCC_CFGR2_PREDIV2_DIV5 | RCC_CFGR2_PLL2MUL8 | + RCC_CFGR2_PREDIV1SRC_PLL2 | RCC_CFGR2_PREDIV1_DIV10); + + /* Enable PLL2 */ + RCC->CR |= RCC_CR_PLL2ON; + /* Wait till PLL2 is ready */ + while((RCC->CR & RCC_CR_PLL2RDY) == 0) + { + } +#elif defined (STM32F10X_LD_VL) || defined (STM32F10X_MD_VL) || defined (STM32F10X_HD_VL) + /* PLL configuration: = (HSE / 2) * 6 = 24 MHz */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL)); + RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_PREDIV1 | RCC_CFGR_PLLXTPRE_PREDIV1_Div2 | RCC_CFGR_PLLMULL6); +#else + /* PLL configuration: = (HSE / 2) * 6 = 24 MHz */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL)); + RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSE | RCC_CFGR_PLLXTPRE_HSE_Div2 | RCC_CFGR_PLLMULL6); +#endif /* STM32F10X_CL */ + + /* Enable PLL */ + RCC->CR |= RCC_CR_PLLON; + + /* Wait till PLL is ready */ + while((RCC->CR & RCC_CR_PLLRDY) == 0) + { + } + + /* Select PLL as system clock source */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); + RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL; + + /* Wait till PLL is used as system clock source */ + while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08) + { + } + } + else + { /* If HSE fails to start-up, the application will have wrong clock + configuration. User can add here some code to deal with this error */ + } +} +#elif defined SYSCLK_FREQ_36MHz +/** + * @brief Sets System clock frequency to 36MHz and configure HCLK, PCLK2 + * and PCLK1 prescalers. + * @note This function should be used only after reset. + * @param None + * @retval None + */ +static void SetSysClockTo36(void) +{ + __IO uint32_t StartUpCounter = 0, HSEStatus = 0; + + /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/ + /* Enable HSE */ + RCC->CR |= ((uint32_t)RCC_CR_HSEON); + + /* Wait till HSE is ready and if Time out is reached exit */ + do + { + HSEStatus = RCC->CR & RCC_CR_HSERDY; + StartUpCounter++; + } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT)); + + if ((RCC->CR & RCC_CR_HSERDY) != RESET) + { + HSEStatus = (uint32_t)0x01; + } + else + { + HSEStatus = (uint32_t)0x00; + } + + if (HSEStatus == (uint32_t)0x01) + { + /* Enable Prefetch Buffer */ + FLASH->ACR |= FLASH_ACR_PRFTBE; + + /* Flash 1 wait state */ + FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY); + FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1; + + /* HCLK = SYSCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; + + /* PCLK2 = HCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; + + /* PCLK1 = HCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1; + +#ifdef STM32F10X_CL + /* Configure PLLs ------------------------------------------------------*/ + + /* PLL configuration: PLLCLK = PREDIV1 * 9 = 36 MHz */ + RCC->CFGR &= (uint32_t)~(RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL); + RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLSRC_PREDIV1 | + RCC_CFGR_PLLMULL9); + + /*!< PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */ + /* PREDIV1 configuration: PREDIV1CLK = PLL2 / 10 = 4 MHz */ + + RCC->CFGR2 &= (uint32_t)~(RCC_CFGR2_PREDIV2 | RCC_CFGR2_PLL2MUL | + RCC_CFGR2_PREDIV1 | RCC_CFGR2_PREDIV1SRC); + RCC->CFGR2 |= (uint32_t)(RCC_CFGR2_PREDIV2_DIV5 | RCC_CFGR2_PLL2MUL8 | + RCC_CFGR2_PREDIV1SRC_PLL2 | RCC_CFGR2_PREDIV1_DIV10); + + /* Enable PLL2 */ + RCC->CR |= RCC_CR_PLL2ON; + /* Wait till PLL2 is ready */ + while((RCC->CR & RCC_CR_PLL2RDY) == 0) + { + } + +#else + /* PLL configuration: PLLCLK = (HSE / 2) * 9 = 36 MHz */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL)); + RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSE | RCC_CFGR_PLLXTPRE_HSE_Div2 | RCC_CFGR_PLLMULL9); +#endif /* STM32F10X_CL */ + + /* Enable PLL */ + RCC->CR |= RCC_CR_PLLON; + + /* Wait till PLL is ready */ + while((RCC->CR & RCC_CR_PLLRDY) == 0) + { + } + + /* Select PLL as system clock source */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); + RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL; + + /* Wait till PLL is used as system clock source */ + while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08) + { + } + } + else + { /* If HSE fails to start-up, the application will have wrong clock + configuration. User can add here some code to deal with this error */ + } +} +#elif defined SYSCLK_FREQ_48MHz +/** + * @brief Sets System clock frequency to 48MHz and configure HCLK, PCLK2 + * and PCLK1 prescalers. + * @note This function should be used only after reset. + * @param None + * @retval None + */ +static void SetSysClockTo48(void) +{ + __IO uint32_t StartUpCounter = 0, HSEStatus = 0; + + /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/ + /* Enable HSE */ + RCC->CR |= ((uint32_t)RCC_CR_HSEON); + + /* Wait till HSE is ready and if Time out is reached exit */ + do + { + HSEStatus = RCC->CR & RCC_CR_HSERDY; + StartUpCounter++; + } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT)); + + if ((RCC->CR & RCC_CR_HSERDY) != RESET) + { + HSEStatus = (uint32_t)0x01; + } + else + { + HSEStatus = (uint32_t)0x00; + } + + if (HSEStatus == (uint32_t)0x01) + { + /* Enable Prefetch Buffer */ + FLASH->ACR |= FLASH_ACR_PRFTBE; + + /* Flash 1 wait state */ + FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY); + FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_1; + + /* HCLK = SYSCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; + + /* PCLK2 = HCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; + + /* PCLK1 = HCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2; + +#ifdef STM32F10X_CL + /* Configure PLLs ------------------------------------------------------*/ + /* PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */ + /* PREDIV1 configuration: PREDIV1CLK = PLL2 / 5 = 8 MHz */ + + RCC->CFGR2 &= (uint32_t)~(RCC_CFGR2_PREDIV2 | RCC_CFGR2_PLL2MUL | + RCC_CFGR2_PREDIV1 | RCC_CFGR2_PREDIV1SRC); + RCC->CFGR2 |= (uint32_t)(RCC_CFGR2_PREDIV2_DIV5 | RCC_CFGR2_PLL2MUL8 | + RCC_CFGR2_PREDIV1SRC_PLL2 | RCC_CFGR2_PREDIV1_DIV5); + + /* Enable PLL2 */ + RCC->CR |= RCC_CR_PLL2ON; + /* Wait till PLL2 is ready */ + while((RCC->CR & RCC_CR_PLL2RDY) == 0) + { + } + + + /* PLL configuration: PLLCLK = PREDIV1 * 6 = 48 MHz */ + RCC->CFGR &= (uint32_t)~(RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL); + RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLSRC_PREDIV1 | + RCC_CFGR_PLLMULL6); +#else + /* PLL configuration: PLLCLK = HSE * 6 = 48 MHz */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL)); + RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSE | RCC_CFGR_PLLMULL6); +#endif /* STM32F10X_CL */ + + /* Enable PLL */ + RCC->CR |= RCC_CR_PLLON; + + /* Wait till PLL is ready */ + while((RCC->CR & RCC_CR_PLLRDY) == 0) + { + } + + /* Select PLL as system clock source */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); + RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL; + + /* Wait till PLL is used as system clock source */ + while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08) + { + } + } + else + { /* If HSE fails to start-up, the application will have wrong clock + configuration. User can add here some code to deal with this error */ + } +} + +#elif defined SYSCLK_FREQ_56MHz +/** + * @brief Sets System clock frequency to 56MHz and configure HCLK, PCLK2 + * and PCLK1 prescalers. + * @note This function should be used only after reset. + * @param None + * @retval None + */ +static void SetSysClockTo56(void) +{ + __IO uint32_t StartUpCounter = 0, HSEStatus = 0; + + /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/ + /* Enable HSE */ + RCC->CR |= ((uint32_t)RCC_CR_HSEON); + + /* Wait till HSE is ready and if Time out is reached exit */ + do + { + HSEStatus = RCC->CR & RCC_CR_HSERDY; + StartUpCounter++; + } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT)); + + if ((RCC->CR & RCC_CR_HSERDY) != RESET) + { + HSEStatus = (uint32_t)0x01; + } + else + { + HSEStatus = (uint32_t)0x00; + } + + if (HSEStatus == (uint32_t)0x01) + { + /* Enable Prefetch Buffer */ + FLASH->ACR |= FLASH_ACR_PRFTBE; + + /* Flash 2 wait state */ + FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY); + FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2; + + /* HCLK = SYSCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; + + /* PCLK2 = HCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; + + /* PCLK1 = HCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2; + +#ifdef STM32F10X_CL + /* Configure PLLs ------------------------------------------------------*/ + /* PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */ + /* PREDIV1 configuration: PREDIV1CLK = PLL2 / 5 = 8 MHz */ + + RCC->CFGR2 &= (uint32_t)~(RCC_CFGR2_PREDIV2 | RCC_CFGR2_PLL2MUL | + RCC_CFGR2_PREDIV1 | RCC_CFGR2_PREDIV1SRC); + RCC->CFGR2 |= (uint32_t)(RCC_CFGR2_PREDIV2_DIV5 | RCC_CFGR2_PLL2MUL8 | + RCC_CFGR2_PREDIV1SRC_PLL2 | RCC_CFGR2_PREDIV1_DIV5); + + /* Enable PLL2 */ + RCC->CR |= RCC_CR_PLL2ON; + /* Wait till PLL2 is ready */ + while((RCC->CR & RCC_CR_PLL2RDY) == 0) + { + } + + + /* PLL configuration: PLLCLK = PREDIV1 * 7 = 56 MHz */ + RCC->CFGR &= (uint32_t)~(RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL); + RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLSRC_PREDIV1 | + RCC_CFGR_PLLMULL7); +#else + /* PLL configuration: PLLCLK = HSE * 7 = 56 MHz */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLMULL)); + RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSE | RCC_CFGR_PLLMULL7); + +#endif /* STM32F10X_CL */ + + /* Enable PLL */ + RCC->CR |= RCC_CR_PLLON; + + /* Wait till PLL is ready */ + while((RCC->CR & RCC_CR_PLLRDY) == 0) + { + } + + /* Select PLL as system clock source */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); + RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL; + + /* Wait till PLL is used as system clock source */ + while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08) + { + } + } + else + { /* If HSE fails to start-up, the application will have wrong clock + configuration. User can add here some code to deal with this error */ + } +} + +#elif defined SYSCLK_FREQ_72MHz +/** + * @brief Sets System clock frequency to 72MHz and configure HCLK, PCLK2 + * and PCLK1 prescalers. + * @note This function should be used only after reset. + * @param None + * @retval None + */ +static void SetSysClockTo72(void) +{ + __IO uint32_t StartUpCounter = 0, HSEStatus = 0; + + /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/ + /* Enable HSE */ + RCC->CR |= ((uint32_t)RCC_CR_HSEON); + + /* Wait till HSE is ready and if Time out is reached exit */ + do + { + HSEStatus = RCC->CR & RCC_CR_HSERDY; + StartUpCounter++; + } while((HSEStatus == 0) && (StartUpCounter != HSE_STARTUP_TIMEOUT)); + + if ((RCC->CR & RCC_CR_HSERDY) != RESET) + { + HSEStatus = (uint32_t)0x01; + } + else + { + HSEStatus = (uint32_t)0x00; + } + + if (HSEStatus == (uint32_t)0x01) + { + /* Enable Prefetch Buffer */ + FLASH->ACR |= FLASH_ACR_PRFTBE; + + /* Flash 2 wait state */ + FLASH->ACR &= (uint32_t)((uint32_t)~FLASH_ACR_LATENCY); + FLASH->ACR |= (uint32_t)FLASH_ACR_LATENCY_2; + + + /* HCLK = SYSCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; + + /* PCLK2 = HCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; + + /* PCLK1 = HCLK */ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV2; + +#ifdef STM32F10X_CL + /* Configure PLLs ------------------------------------------------------*/ + /* PLL2 configuration: PLL2CLK = (HSE / 5) * 8 = 40 MHz */ + /* PREDIV1 configuration: PREDIV1CLK = PLL2 / 5 = 8 MHz */ + + RCC->CFGR2 &= (uint32_t)~(RCC_CFGR2_PREDIV2 | RCC_CFGR2_PLL2MUL | + RCC_CFGR2_PREDIV1 | RCC_CFGR2_PREDIV1SRC); + RCC->CFGR2 |= (uint32_t)(RCC_CFGR2_PREDIV2_DIV5 | RCC_CFGR2_PLL2MUL8 | + RCC_CFGR2_PREDIV1SRC_PLL2 | RCC_CFGR2_PREDIV1_DIV5); + + /* Enable PLL2 */ + RCC->CR |= RCC_CR_PLL2ON; + /* Wait till PLL2 is ready */ + while((RCC->CR & RCC_CR_PLL2RDY) == 0) + { + } + + + /* PLL configuration: PLLCLK = PREDIV1 * 9 = 72 MHz */ + RCC->CFGR &= (uint32_t)~(RCC_CFGR_PLLXTPRE | RCC_CFGR_PLLSRC | RCC_CFGR_PLLMULL); + RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLXTPRE_PREDIV1 | RCC_CFGR_PLLSRC_PREDIV1 | + RCC_CFGR_PLLMULL9); +#else + /* PLL configuration: PLLCLK = HSE * 9 = 72 MHz */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | + RCC_CFGR_PLLMULL)); + RCC->CFGR |= (uint32_t)(RCC_CFGR_PLLSRC_HSE | RCC_CFGR_PLLMULL9); +#endif /* STM32F10X_CL */ + + /* Enable PLL */ + RCC->CR |= RCC_CR_PLLON; + + /* Wait till PLL is ready */ + while((RCC->CR & RCC_CR_PLLRDY) == 0) + { + } + + /* Select PLL as system clock source */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); + RCC->CFGR |= (uint32_t)RCC_CFGR_SW_PLL; + + /* Wait till PLL is used as system clock source */ + while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)0x08) + { + } + } + else + { /* If HSE fails to start-up, the application will have wrong clock + configuration. User can add here some code to deal with this error */ + } +} +#endif + +/** + * @} + */ + +/** + * @} + */ + +/** + * @} + */ +/******************* (C) COPYRIGHT 2011 STMicroelectronics *****END OF FILE****/