STM32L152软件模拟SPI驱动CC1101

/** @page GPIO_IOToggle GPIO IO Toggle example @verbatim ******************** (C) COPYRIGHT 2010 STMicroelectronics ******************* * @file GPIO/IOToggle/readme.txt * @author MCD Application Team * @version V1.0.0 * @date 31-December-2010 * @brief Description of the GPIO IO Toggle 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 GPIO ports are connected on AHB bus, using BSRRH and BSRRL registers one cycle is required to set a pin and another cycle to reset it. So GPIO pins can toggle at AHB clock divided by 2. This example describes how to use BSRRH and BSRRL (Port Bit Set/Reset Register High and Low) for maximum IO toggling. PD0 and PD2 (configured in output pushpull mode) toggles in a forever loop: - Set PD0 and PD2 by setting corresponding bits in BSRRL register - Reset PD0 and PD2 by setting corresponding bits in BSRRH register In this example, HCLK is configured at 32 MHz so PD0 and PD2 toggles at 16MHz. To achieve the maximum IO toggling frequency, you have to configure your compiler options for high speed optimization. @par Directory contents - GPIO/IOToggle/stm32l1xx_conf.h Library Configuration file - GPIO/IOToggle/stm32l1xx_it.c Interrupt handlers - GPIO/IOToggle/stm32l1xx_it.h Interrupt handlers header file - GPIO/IOToggle/main.c Main program - GPIO/IOToggle/system_stm32l1xx.c STM32L1xx system source file @note The "system_stm32l1xx.c" is generated by an automatic clock configuration system and can be easily customized to your own configuration. To select different clock setup, use the "STM32L1xx_Clock_Configuration_V1.0.0.xls" provided with the AN3309 package available on <a href="http://www.st.com/internet/mcu/family/141.jsp"> ST Microcontrollers </a> @par Hardware and Software environment - This example runs on STM32L1xx Ultra Low Power Medium-Density Devices. - This example has been tested with STMicroelectronics STM32L152-EVAL (STM32L1xx Ultra Low Power Medium-Density) evaluation board and can be easily tailored to any other supported device and development board. @par How to use it ? In order to make the program work, you must do the following : - Copy all source files from this example folder to the template folder under Project\STM32L1xx_StdPeriph_Template - Open your preferred toolchain - Rebuild all files and load your image into target memory - Run the example @note - Ultra Low Power Medium-density devices are STM32L151xx and STM32L152xx microcontrollers where the Flash memory density ranges between 64 and 128 Kbytes. * <h3><center>&copy; COPYRIGHT 2010 STMicroelectronics</center></h3> */