From: Fabien Le Mentec Date: Sun, 16 Oct 2011 22:38:27 +0000 (-0500) Subject: [add] blink_flash example X-Git-Url: https://git.gag.com/?a=commitdiff_plain;h=6b9c19ceb8145c1d3ae8e09f8d1c700d90f5c2f2;p=fw%2Fstlink [add] blink_flash example --- diff --git a/example/blink_flash/Makefile b/example/blink_flash/Makefile new file mode 100644 index 0000000..d058390 --- /dev/null +++ b/example/blink_flash/Makefile @@ -0,0 +1,25 @@ +EXECUTABLE=blink.elf +BIN_IMAGE=blink.bin + +CC=arm-none-eabi-gcc +OBJCOPY=arm-none-eabi-objcopy + +CFLAGS=-O2 -mlittle-endian -mthumb +CFLAGS+=-mcpu=cortex-m3 -ffreestanding -nostdlib -nostdinc + +# to run from FLASH +CFLAGS+=-Wl,-T,stm32_flash.ld + +all: $(BIN_IMAGE) + +$(BIN_IMAGE): $(EXECUTABLE) + $(OBJCOPY) -O binary $^ $@ + +$(EXECUTABLE): main.c startup_stm32l1xx_md.s + $(CC) $(CFLAGS) $^ -o $@ + +clean: + rm -rf $(EXECUTABLE) + rm -rf $(BIN_IMAGE) + +.PHONY: all clean diff --git a/example/blink_flash/main.c b/example/blink_flash/main.c new file mode 100644 index 0000000..e93fd72 --- /dev/null +++ b/example/blink_flash/main.c @@ -0,0 +1,82 @@ +/* missing type */ + +typedef unsigned int uint32_t; + + +/* hardware configuration */ + +#define CONFIG_STM32L_DISCOVERY 1 +#define CONFIG_STM32VL_DISCOVERY 0 + + +#if CONFIG_STM32VL_DISCOVERY + +# define GPIOC 0x40011000 /* port C */ +# define GPIOC_CRH (GPIOC + 0x04) /* port configuration register high */ +# define GPIOC_ODR (GPIOC + 0x0c) /* port output data register */ + +# define LED_BLUE (1 << 8) /* port C, pin 8 */ +# define LED_GREEN (1 << 9) /* port C, pin 9 */ + +static inline void setup_leds(void) +{ + *(volatile uint32_t*)GPIOC_CRH = 0x44444411; +} + +static inline void switch_leds_on(void) +{ + *(volatile uint32_t*)GPIOC_ODR = LED_BLUE | LED_GREEN; +} + +static inline void switch_leds_off(void) +{ + *(volatile uint32_t*)GPIOC_ODR = 0; +} + +#elif CONFIG_STM32L_DISCOVERY + +# define GPIOB 0x40020400 /* port B */ +# define GPIOB_MODER (GPIOB + 0x00) /* port mode register */ +# define GPIOB_ODR (GPIOB + 0x14) /* port output data register */ + +# define LED_BLUE (1 << 6) /* port B, pin 6 */ +# define LED_GREEN (1 << 7) /* port B, pin 7 */ + +static inline void setup_leds(void) +{ + /* configure port 6 and 7 as output */ + *(volatile uint32_t*)GPIOB_MODER |= (1 << (7 * 2)) | (1 << (6 * 2)); +} + +static inline void switch_leds_on(void) +{ + *(volatile uint32_t*)GPIOB_ODR = LED_BLUE | LED_GREEN; +} + +static inline void switch_leds_off(void) +{ + *(volatile uint32_t*)GPIOB_ODR = 0; +} + +#endif /* otherwise, error */ + + +#define delay() \ +do { \ + register unsigned int i; \ + for (i = 0; i < 1000000; ++i) \ + __asm__ __volatile__ ("nop\n\t":::"memory"); \ +} while (0) + +void main(void) +{ + setup_leds(); + + while (1) + { + switch_leds_on(); + delay(); + switch_leds_off(); + delay(); + } +} diff --git a/example/blink_flash/startup_stm32l1xx_md.s b/example/blink_flash/startup_stm32l1xx_md.s new file mode 100644 index 0000000..4ec8203 --- /dev/null +++ b/example/blink_flash/startup_stm32l1xx_md.s @@ -0,0 +1,366 @@ +/** + ****************************************************************************** + * @file startup_stm32l1xx_md.s + * @author MCD Application Team + * @version V1.0.0 + * @date 31-December-2010 + * @brief STM32L1xx Ultra Low Power Medium-density Devices vector table for + * RIDE7 toolchain. + * This module performs: + * - Set the initial SP + * - Set the initial PC == Reset_Handler, + * - Set the vector table entries with the exceptions ISR address + * - Branches to main in the C library (which eventually + * calls main()). + * After Reset the Cortex-M3 processor is in Thread mode, + * priority is Privileged, and the Stack is set to Main. + ******************************************************************************* + * @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. + * + *

© COPYRIGHT 2010 STMicroelectronics

+ ******************************************************************************* + */ + + .syntax unified + .cpu cortex-m3 + .fpu softvfp + .thumb + +.global g_pfnVectors +.global Default_Handler + +/* start address for the initialization values of the .data section. +defined in linker script */ +.word _sidata +/* start address for the .data section. defined in linker script */ +.word _sdata +/* end address for the .data section. defined in linker script */ +.word _edata +/* start address for the .bss section. defined in linker script */ +.word _sbss +/* end address for the .bss section. defined in linker script */ +.word _ebss + +.equ BootRAM, 0xF108F85F +/** + * @brief This is the code that gets called when the processor first + * starts execution following a reset event. Only the absolutely + * necessary set is performed, after which the application + * supplied main() routine is called. + * @param None + * @retval : None +*/ + + .section .text.Reset_Handler + .weak Reset_Handler + .type Reset_Handler, %function +Reset_Handler: + +/* Copy the data segment initializers from flash to SRAM */ + movs r1, #0 + b LoopCopyDataInit + +CopyDataInit: + ldr r3, =_sidata + ldr r3, [r3, r1] + str r3, [r0, r1] + adds r1, r1, #4 + +LoopCopyDataInit: + ldr r0, =_sdata + ldr r3, =_edata + adds r2, r0, r1 + cmp r2, r3 + bcc CopyDataInit + ldr r2, =_sbss + b LoopFillZerobss +/* Zero fill the bss segment. */ +FillZerobss: + movs r3, #0 + str r3, [r2], #4 + +LoopFillZerobss: + ldr r3, = _ebss + cmp r2, r3 + bcc FillZerobss +/* Call the clock system intitialization function.*/ +/* let main do the system initialization */ +/* bl SystemInit */ +/* Call the application's entry point.*/ + bl main + bx lr +.size Reset_Handler, .-Reset_Handler + +/** + * @brief This is the code that gets called when the processor receives an + * unexpected interrupt. This simply enters an infinite loop, preserving + * the system state for examination by a debugger. + * + * @param None + * @retval None +*/ + .section .text.Default_Handler,"ax",%progbits +Default_Handler: +Infinite_Loop: + b Infinite_Loop + .size Default_Handler, .-Default_Handler +/******************************************************************************* +* +* The minimal vector table for a Cortex M3. Note that the proper constructs +* must be placed on this to ensure that it ends up at physical address +* 0x0000.0000. +*******************************************************************************/ + .section .isr_vector,"a",%progbits + .type g_pfnVectors, %object + .size g_pfnVectors, .-g_pfnVectors + + +g_pfnVectors: + .word _estack + .word Reset_Handler + .word NMI_Handler + .word HardFault_Handler + .word MemManage_Handler + .word BusFault_Handler + .word UsageFault_Handler + .word 0 + .word 0 + .word 0 + .word 0 + .word SVC_Handler + .word DebugMon_Handler + .word 0 + .word PendSV_Handler + .word SysTick_Handler + .word WWDG_IRQHandler + .word PVD_IRQHandler + .word TAMPER_STAMP_IRQHandler + .word RTC_WKUP_IRQHandler + .word FLASH_IRQHandler + .word RCC_IRQHandler + .word EXTI0_IRQHandler + .word EXTI1_IRQHandler + .word EXTI2_IRQHandler + .word EXTI3_IRQHandler + .word EXTI4_IRQHandler + .word DMA1_Channel1_IRQHandler + .word DMA1_Channel2_IRQHandler + .word DMA1_Channel3_IRQHandler + .word DMA1_Channel4_IRQHandler + .word DMA1_Channel5_IRQHandler + .word DMA1_Channel6_IRQHandler + .word DMA1_Channel7_IRQHandler + .word ADC1_IRQHandler + .word USB_HP_IRQHandler + .word USB_LP_IRQHandler + .word DAC_IRQHandler + .word COMP_IRQHandler + .word EXTI9_5_IRQHandler + .word LCD_IRQHandler + .word TIM9_IRQHandler + .word TIM10_IRQHandler + .word TIM11_IRQHandler + .word TIM2_IRQHandler + .word TIM3_IRQHandler + .word TIM4_IRQHandler + .word I2C1_EV_IRQHandler + .word I2C1_ER_IRQHandler + .word I2C2_EV_IRQHandler + .word I2C2_ER_IRQHandler + .word SPI1_IRQHandler + .word SPI2_IRQHandler + .word USART1_IRQHandler + .word USART2_IRQHandler + .word USART3_IRQHandler + .word EXTI15_10_IRQHandler + .word RTC_Alarm_IRQHandler + .word USB_FS_WKUP_IRQHandler + .word TIM6_IRQHandler + .word TIM7_IRQHandler + .word 0 + .word 0 + .word 0 + .word 0 + .word 0 + .word BootRAM /* @0x108. This is for boot in RAM mode for + STM32L15x ULtra Low Power Medium-density devices. */ + +/******************************************************************************* +* +* Provide weak aliases for each Exception handler to the Default_Handler. +* As they are weak aliases, any function with the same name will override +* this definition. +* +*******************************************************************************/ + + .weak NMI_Handler + .thumb_set NMI_Handler,Default_Handler + + .weak HardFault_Handler + .thumb_set HardFault_Handler,Default_Handler + + .weak MemManage_Handler + .thumb_set MemManage_Handler,Default_Handler + + .weak BusFault_Handler + .thumb_set BusFault_Handler,Default_Handler + + .weak UsageFault_Handler + .thumb_set UsageFault_Handler,Default_Handler + + .weak SVC_Handler + .thumb_set SVC_Handler,Default_Handler + + .weak DebugMon_Handler + .thumb_set DebugMon_Handler,Default_Handler + + .weak PendSV_Handler + .thumb_set PendSV_Handler,Default_Handler + + .weak SysTick_Handler + .thumb_set SysTick_Handler,Default_Handler + + .weak WWDG_IRQHandler + .thumb_set WWDG_IRQHandler,Default_Handler + + .weak PVD_IRQHandler + .thumb_set PVD_IRQHandler,Default_Handler + + .weak TAMPER_STAMP_IRQHandler + .thumb_set TAMPER_STAMP_IRQHandler,Default_Handler + + .weak RTC_WKUP_IRQHandler + .thumb_set RTC_WKUP_IRQHandler,Default_Handler + + .weak FLASH_IRQHandler + .thumb_set FLASH_IRQHandler,Default_Handler + + .weak RCC_IRQHandler + .thumb_set RCC_IRQHandler,Default_Handler + + .weak EXTI0_IRQHandler + .thumb_set EXTI0_IRQHandler,Default_Handler + + .weak EXTI1_IRQHandler + .thumb_set EXTI1_IRQHandler,Default_Handler + + .weak EXTI2_IRQHandler + .thumb_set EXTI2_IRQHandler,Default_Handler + + .weak EXTI3_IRQHandler + .thumb_set EXTI3_IRQHandler,Default_Handler + + .weak EXTI4_IRQHandler + .thumb_set EXTI4_IRQHandler,Default_Handler + + .weak DMA1_Channel1_IRQHandler + .thumb_set DMA1_Channel1_IRQHandler,Default_Handler + + .weak DMA1_Channel2_IRQHandler + .thumb_set DMA1_Channel2_IRQHandler,Default_Handler + + .weak DMA1_Channel3_IRQHandler + .thumb_set DMA1_Channel3_IRQHandler,Default_Handler + + .weak DMA1_Channel4_IRQHandler + .thumb_set DMA1_Channel4_IRQHandler,Default_Handler + + .weak DMA1_Channel5_IRQHandler + .thumb_set DMA1_Channel5_IRQHandler,Default_Handler + + .weak DMA1_Channel6_IRQHandler + .thumb_set DMA1_Channel6_IRQHandler,Default_Handler + + .weak DMA1_Channel7_IRQHandler + .thumb_set DMA1_Channel7_IRQHandler,Default_Handler + + .weak ADC1_IRQHandler + .thumb_set ADC1_IRQHandler,Default_Handler + + .weak USB_HP_IRQHandler + .thumb_set USB_HP_IRQHandler,Default_Handler + + .weak USB_LP_IRQHandler + .thumb_set USB_LP_IRQHandler,Default_Handler + + .weak DAC_IRQHandler + .thumb_set DAC_IRQHandler,Default_Handler + + .weak COMP_IRQHandler + .thumb_set COMP_IRQHandler,Default_Handler + + .weak EXTI9_5_IRQHandler + .thumb_set EXTI9_5_IRQHandler,Default_Handler + + .weak LCD_IRQHandler + .thumb_set LCD_IRQHandler,Default_Handler + + .weak TIM9_IRQHandler + .thumb_set TIM9_IRQHandler,Default_Handler + + .weak TIM10_IRQHandler + .thumb_set TIM10_IRQHandler,Default_Handler + + .weak TIM11_IRQHandler + .thumb_set TIM11_IRQHandler,Default_Handler + + .weak TIM2_IRQHandler + .thumb_set TIM2_IRQHandler,Default_Handler + + .weak TIM3_IRQHandler + .thumb_set TIM3_IRQHandler,Default_Handler + + .weak TIM4_IRQHandler + .thumb_set TIM4_IRQHandler,Default_Handler + + .weak I2C1_EV_IRQHandler + .thumb_set I2C1_EV_IRQHandler,Default_Handler + + .weak I2C1_ER_IRQHandler + .thumb_set I2C1_ER_IRQHandler,Default_Handler + + .weak I2C2_EV_IRQHandler + .thumb_set I2C2_EV_IRQHandler,Default_Handler + + .weak I2C2_ER_IRQHandler + .thumb_set I2C2_ER_IRQHandler,Default_Handler + + .weak SPI1_IRQHandler + .thumb_set SPI1_IRQHandler,Default_Handler + + .weak SPI2_IRQHandler + .thumb_set SPI2_IRQHandler,Default_Handler + + .weak USART1_IRQHandler + .thumb_set USART1_IRQHandler,Default_Handler + + .weak USART2_IRQHandler + .thumb_set USART2_IRQHandler,Default_Handler + + .weak USART3_IRQHandler + .thumb_set USART3_IRQHandler,Default_Handler + + .weak EXTI15_10_IRQHandler + .thumb_set EXTI15_10_IRQHandler,Default_Handler + + .weak RTC_Alarm_IRQHandler + .thumb_set RTC_Alarm_IRQHandler,Default_Handler + + .weak USB_FS_WKUP_IRQHandler + .thumb_set USB_FS_WKUP_IRQHandler,Default_Handler + + .weak TIM6_IRQHandler + .thumb_set TIM6_IRQHandler,Default_Handler + + .weak TIM7_IRQHandler + .thumb_set TIM7_IRQHandler,Default_Handler + +/******************** (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE***/ + diff --git a/example/blink_flash/stm32_flash.ld b/example/blink_flash/stm32_flash.ld new file mode 100644 index 0000000..146b16e --- /dev/null +++ b/example/blink_flash/stm32_flash.ld @@ -0,0 +1,173 @@ +/* +***************************************************************************** +** +** File : stm32_flash.ld +** +** Abstract : Linker script for STM32L152RB Device with +** 128KByte FLASH, 16KByte RAM +** +** Set heap size, stack size and stack location according +** to application requirements. +** +** Set memory bank area and size if external memory is used. +** +** Target : STMicroelectronics STM32 +** +** Environment : Atollic TrueSTUDIO(R) +** +** Distribution: The file is distributed “as is,” without any warranty +** of any kind. +** +** (c)Copyright Atollic AB. +** You may use this file as-is or modify it according to the needs of your +** project. Distribution of this file (unmodified or modified) is not +** permitted. Atollic AB permit registered Atollic TrueSTUDIO(R) users the +** rights to distribute the assembled, compiled & linked contents of this +** file as part of an application binary file, provided that it is built +** using the Atollic TrueSTUDIO(R) toolchain. +** +***************************************************************************** +*/ + +/* Entry Point */ +ENTRY(Reset_Handler) + +/* Highest address of the user mode stack */ +_estack = 0x20004000; /* end of 16K RAM */ + +/* Generate a link error if heap and stack don't fit into RAM */ +_Min_Heap_Size = 0; /* required amount of heap */ +_Min_Stack_Size = 0x80; /* required amount of stack */ + +/* Specify the memory areas */ +MEMORY +{ + FLASH (rx) : ORIGIN = 0x08000000, LENGTH = 128K + RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 16K + MEMORY_B1 (rx) : ORIGIN = 0x60000000, LENGTH = 0K + RW_EEPROM (rw) : ORIGIN = 0x08080000, LENGTH = 32 +} + +/* Define output sections */ +SECTIONS +{ + /* The startup code goes first into FLASH */ + .isr_vector : + { + . = ALIGN(4); + KEEP(*(.isr_vector)) /* Startup code */ + . = ALIGN(4); + } >FLASH + + /* The program code and other data goes into FLASH */ + .text : + { + . = ALIGN(4); + *(.text) /* .text sections (code) */ + *(.text*) /* .text* sections (code) */ + *(.rodata) /* .rodata sections (constants, strings, etc.) */ + *(.rodata*) /* .rodata* sections (constants, strings, etc.) */ + *(.glue_7) /* glue arm to thumb code */ + *(.glue_7t) /* glue thumb to arm code */ + *(.eh_frame) + + KEEP (*(.init)) + KEEP (*(.fini)) + + . = ALIGN(4); + _etext = .; /* define a global symbols at end of code */ + } >FLASH + + + .ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH + .ARM : { + __exidx_start = .; + *(.ARM.exidx*) + __exidx_end = .; + } >FLASH + + .preinit_array : + { + PROVIDE_HIDDEN (__preinit_array_start = .); + KEEP (*(.preinit_array*)) + PROVIDE_HIDDEN (__preinit_array_end = .); + } >FLASH + .init_array : + { + PROVIDE_HIDDEN (__init_array_start = .); + KEEP (*(SORT(.init_array.*))) + KEEP (*(.init_array*)) + PROVIDE_HIDDEN (__init_array_end = .); + } >FLASH + .fini_array : + { + PROVIDE_HIDDEN (__fini_array_start = .); + KEEP (*(.fini_array*)) + KEEP (*(SORT(.fini_array.*))) + PROVIDE_HIDDEN (__fini_array_end = .); + } >FLASH + + /* used by the startup to initialize data */ + _sidata = .; + + /* Initialized data sections goes into RAM, load LMA copy after code */ + .data : AT ( _sidata ) + { + . = ALIGN(4); + _sdata = .; /* create a global symbol at data start */ + *(.data) /* .data sections */ + *(.data*) /* .data* sections */ + + . = ALIGN(4); + _edata = .; /* define a global symbol at data end */ + } >RAM + + /* Uninitialized data section */ + . = ALIGN(4); + .bss : + { + /* This is used by the startup in order to initialize the .bss secion */ + _sbss = .; /* define a global symbol at bss start */ + __bss_start__ = _sbss; + *(.bss) + *(.bss*) + *(COMMON) + + . = ALIGN(4); + _ebss = .; /* define a global symbol at bss end */ + __bss_end__ = _ebss; + } >RAM + + /* User_heap_stack section, used to check that there is enough RAM left */ + ._user_heap_stack : + { + . = ALIGN(4); + PROVIDE ( end = . ); + PROVIDE ( _end = . ); + . = . + _Min_Heap_Size; + . = . + _Min_Stack_Size; + . = ALIGN(4); + } >RAM + + /* MEMORY_bank1 section, code must be located here explicitly */ + /* Example: extern int foo(void) __attribute__ ((section (".mb1text"))); */ + .memory_b1_text : + { + *(.mb1text) /* .mb1text sections (code) */ + *(.mb1text*) /* .mb1text* sections (code) */ + *(.mb1rodata) /* read-only data (constants) */ + *(.mb1rodata*) + } >MEMORY_B1 + + /* Remove information from the standard libraries */ + /DISCARD/ : + { + libc.a ( * ) + libm.a ( * ) + libgcc.a ( * ) + } + + .ARM.attributes 0 : { *(.ARM.attributes) } + + .DataFlash (NOLOAD): {*(.DataFlash)} >RW_EEPROM +} diff --git a/example/blink_flash/system_stm32l1xx.c b/example/blink_flash/system_stm32l1xx.c new file mode 100644 index 0000000..6deab32 --- /dev/null +++ b/example/blink_flash/system_stm32l1xx.c @@ -0,0 +1,367 @@ +/** + ****************************************************************************** + * @file system_stm32l1xx.c + * @author MCD Application Team + * @version V1.0.0 + * @date 2-June-2011 + * @brief CMSIS Cortex-M3 Device Peripheral Access Layer System Source File. + * This file contains the system clock configuration for STM32L1xx Ultra + * Low Medium-density devices, and is generated by the clock configuration + * tool "STM32L1xx_Clock_Configuration_V1.0.0.xls". + * + * 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 + * and Divider factors, AHB/APBx prescalers and Flash settings), + * depending on the configuration made in the clock xls tool. + * This function is called at startup just after reset and + * before branch to main program. This call is made inside + * the "startup_stm32l1xx_md.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 MSI (2.1 MHz Range) is used as system clock source. + * Then SystemInit() function is called, in "startup_stm32l1xx_md.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 MSI 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 8MHz, refer to "HSE_VALUE" define + * in "stm32l1xx.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. + * + * 5. This file configures the system clock as follows: + *============================================================================= + * System Clock Configuration + *============================================================================= + * System clock source | HSI + *----------------------------------------------------------------------------- + * SYSCLK | 16000000 Hz + *----------------------------------------------------------------------------- + * HCLK | 16000000 Hz + *----------------------------------------------------------------------------- + * AHB Prescaler | 1 + *----------------------------------------------------------------------------- + * APB1 Prescaler | 1 + *----------------------------------------------------------------------------- + * APB2 Prescaler | 1 + *----------------------------------------------------------------------------- + * HSE Frequency | 8000000 Hz + *----------------------------------------------------------------------------- + * PLL DIV | Not Used + *----------------------------------------------------------------------------- + * PLL MUL | Not Used + *----------------------------------------------------------------------------- + * VDD | 3.3 V + *----------------------------------------------------------------------------- + * Vcore | 1.8 V (Range 1) + *----------------------------------------------------------------------------- + * Flash Latency | 0 WS + *----------------------------------------------------------------------------- + * Require 48MHz for USB clock | Disabled + *----------------------------------------------------------------------------- + *============================================================================= + ****************************************************************************** + * @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. + * + *

© COPYRIGHT 2010 STMicroelectronics

+ ****************************************************************************** + */ + +/** @addtogroup CMSIS + * @{ + */ + +/** @addtogroup stm32l1xx_system + * @{ + */ + +/** @addtogroup STM32L1xx_System_Private_Includes + * @{ + */ + +#include "stm32l1xx.h" + +/** + * @} + */ + +/** @addtogroup STM32L1xx_System_Private_TypesDefinitions + * @{ + */ + +/** + * @} + */ + +/** @addtogroup STM32L1xx_System_Private_Defines + * @{ + */ +/*!< 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 STM32L1xx_System_Private_Macros + * @{ + */ + +/** + * @} + */ + +/** @addtogroup STM32L1xx_System_Private_Variables + * @{ + */ +uint32_t SystemCoreClock = 16000000; +__I uint8_t PLLMulTable[9] = {3, 4, 6, 8, 12, 16, 24, 32, 48}; +__I uint8_t AHBPrescTable[16] = {0, 0, 0, 0, 0, 0, 0, 0, 1, 2, 3, 4, 6, 7, 8, 9}; + +/** + * @} + */ + +/** @addtogroup STM32L1xx_System_Private_FunctionPrototypes + * @{ + */ + +static void SetSysClock(void); + +/** + * @} + */ + +/** @addtogroup STM32L1xx_System_Private_Functions + * @{ + */ + +/** + * @brief Setup the microcontroller system. + * Initialize the Embedded Flash Interface, the PLL and update the + * SystemCoreClock variable. + * @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)0x88FFC00C; + + /*!< Reset HSION, HSEON, CSSON and PLLON bits */ + RCC->CR &= (uint32_t)0xEEFEFFFE; + + /*!< 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->CIR = 0x00000000; + + /* Configure the System clock frequency, AHB/APBx prescalers and Flash settings */ + 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 according to Clock Register Values + * @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 stm32l1xx.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 stm32l1xx.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 frequency, 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 + */ +static void SetSysClock(void) +{ + __IO uint32_t StartUpCounter = 0, HSIStatus = 0; + + /* SYSCLK, HCLK, PCLK2 and PCLK1 configuration ---------------------------*/ + /* Enable HSI */ + RCC->CR |= ((uint32_t)RCC_CR_HSION); + + /* Wait till HSI is ready and if Time out is reached exit */ + do + { + HSIStatus = RCC->CR & RCC_CR_HSIRDY; + } while((HSIStatus == 0) && (StartUpCounter != HSI_STARTUP_TIMEOUT)); + + if ((RCC->CR & RCC_CR_HSIRDY) != RESET) + { + HSIStatus = (uint32_t)0x01; + } + else + { + HSIStatus = (uint32_t)0x00; + } + + if (HSIStatus == (uint32_t)0x01) + { + /* Flash 0 wait state */ + FLASH->ACR &= ~FLASH_ACR_LATENCY; + + /* Disable Prefetch Buffer */ + FLASH->ACR &= ~FLASH_ACR_PRFTEN; + + /* Disable 64-bit access */ + FLASH->ACR &= ~FLASH_ACR_ACC64; + + + /* Power enable */ + RCC->APB1ENR |= RCC_APB1ENR_PWREN; + + /* Select the Voltage Range 1 (1.8 V) */ + PWR->CR = PWR_CR_VOS_0; + + + /* Wait Until the Voltage Regulator is ready */ + while((PWR->CSR & PWR_CSR_VOSF) != RESET) + { + } + + /* HCLK = SYSCLK /1*/ + RCC->CFGR |= (uint32_t)RCC_CFGR_HPRE_DIV1; + /* PCLK2 = HCLK /1*/ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE2_DIV1; + + /* PCLK1 = HCLK /1*/ + RCC->CFGR |= (uint32_t)RCC_CFGR_PPRE1_DIV1; + + /* Select HSI as system clock source */ + RCC->CFGR &= (uint32_t)((uint32_t)~(RCC_CFGR_SW)); + RCC->CFGR |= (uint32_t)RCC_CFGR_SW_HSI; + + /* Wait till HSI is used as system clock source */ + while ((RCC->CFGR & (uint32_t)RCC_CFGR_SWS) != (uint32_t)RCC_CFGR_SWS_HSI) + { + } + } + else + { + /* If HSI fails to start-up, the application will have wrong clock + configuration. User can add here some code to deal with this error */ + } +} + +/** + * @} + */ + +/** + * @} + */ + +/** + * @} + */ + +/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/