STM32 内部 RTC 修正

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  • 2022-06-07 08:11
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这个是一个KEIL的项目,项目解决了内部RTC随温度变化导致频率改变的问题。STM32的手册上说 内部RTC低速晶振频率典型是40K,实际上内部低速晶振的频率是会随温度变化而变化的。所以如果没有修正的话,时间会 偏差很大。这个项目实现了用TIM2对RTC的精确修正,同时应用了备份寄存器,存储修正值,掉电不丢失。
内部RTC时钟修正.rar
内容介绍
/** @page RTC_Calendar RTC_Calendar @verbatim ******************** (C) COPYRIGHT 2009 STMicroelectronics ******************* * @file RTC/Calendar/readme.txt * @author MCD Application Team * @version V3.1.0 * @date 06/19/2009 * @brief Description of the RTC Calendar Example. ****************************************************************************** * 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. ****************************************************************************** @endverbatim @par Example Description This example demonstrates and explains how to use the RTC peripheral. As an application example, it demonstrates how to setup the RTC peripheral, in terms of prescaler and interrupts, to be used to keep time and to generate Second interrupt. The Low Speed External (LSE) clock is used as RTC clock source. The RTC clock can be output on the Tamper pin (PC.13). To enable this functionality, uncomment the corresponding line: #define RTCClockOutput_Enable in the main.c file. The RTC is in the backup (BKP) domain, still powered by VBAT when VDD is switched off, so the RTC configuration is not lost if a battery is connected to the VBAT pin. A key value is written in backup data register1 (BKP_DR1) to indicate if the RTC is already configured. The program behaves as follows: 1. After startup the program checks the backup data register1 value: - register1 value not correct: (BKP_DR1 value is not correct or has not yet been programmed when the program is executed for the first time) the RTC is configured and the user is asked to set the time (entered on HyperTerminal). - register1 value correct: this means that the RTC is configured and the time is displayed on HyperTerminal. 2. When an External Reset occurs the BKP domain is not reset and the RTC configuration is not lost. 3. When power on reset occurs: - If a battery is connected to the VBAT pin: the BKP domain is not reset and the RTC configuration is not lost. - If no battery is connected to the VBAT pin: the BKP domain is reset and the RTC configuration is lost. In the RTC interrupt service routine, the LED1 toggles every 1 s. The C library printf function is retargeted to the USART, that is, the printf message is output to the HyperTerminal using USART1 or USART2 depending on the EVAL board you are using. @par Directory contents - RTC/Calendar/stm32f10x_conf.h Library Configuration file - RTC/Calendar/stm32f10x_it.c Interrupt handlers - RTC/Calendar/stm32f10x_it.h Header for stm32f10x_it.c - RTC/Calendar/main.c Main program @par Hardware and Software environment - This example runs on STM32F10x Connectivity line, High-Density, Medium-Density and Low-Density Devices. - This example has been tested with STMicroelectronics STM3210C-EVAL (STM32F10x Connectivity line), STM3210E-EVAL (STM32F10x High-Density) and STM3210B-EVAL (STM32F10x Medium-Density) evaluation boards and can be easily tailored to any other supported device and development board. To select the STMicroelectronics evaluation board used to run the example, uncomment the corresponding line in stm32_eval.h file (under Utilities\STM32_EVAL) - STM3210C-EVAL Set-up - Use LED1 connected to PD.07. - Connect a null-modem female/female RS232 cable between the DB9 connector CN6 (USART2) and PC serial port . @note Make sure that jumpers JP19 and JP18 are open. - Make sure that jumper JP24 is in position 1-2 to connect the 3V battery to VBAT pin - STM3210E-EVAL Set-up - Use LED1 connected to PF.06. - Connect a null-modem female/female RS232 cable between the DB9 connector CN12(when USART1 is used) and PC serial port. - Make sure that jumper JP1 is in position 1-2 to connect the 3V battery to VBAT pin - STM3210B-EVAL Set-up - Use LED1 connected to PC.06. - Connect a null-modem female/female RS232 cable between the DB9 connector CN6(when USART1 is used) and PC serial port. - Make sure that jumper JP11 is in position 1-2 to connect the 3V battery to VBAT pin - Hyperterminal configuration: - Word Length = 8 Bits - One Stop Bit - No parity - BaudRate = 115200 baud - flow control: None @par How to use it ? In order to make the program work, you must do the following : - Create a project and setup all project configuration - Add the required Library files : - stm32f10x_gpio.c - stm32f10x_rcc.c - stm32f10x_rtc.c - stm32f10x_bkp.c - stm32f10x_pwr.c - misc.c - stm32f10x_usart.c - stm32f10x_exti.c - system_stm32f10x.c (under Libraries\CMSIS\Core\CM3) - stm32_eval.c (under Utilities\STM32_EVAL) - Edit stm32f10x.h file to select the device you are working on. - Edit stm32_eval.h file to select the evaluation board you will use. @b Tip: You can tailor the provided project template to run this example, for more details please refer to "stm32f10x_stdperiph_lib_um.chm" user manual; select "Peripheral Examples" then follow the instructions provided in "How to proceed" section. - Link all compiled files and load your image into target memory - Run the example @note - Low-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 16 and 32 Kbytes. - Medium-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 32 and 128 Kbytes. - High-density devices are STM32F101xx and STM32F103xx microcontrollers where the Flash memory density ranges between 256 and 512 Kbytes. - Connectivity line devices are STM32F105xx and STM32F107xx microcontrollers. * <h3><center>&copy; COPYRIGHT 2009 STMicroelectronics</center></h3> */
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