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众所周知, STM32F429I-Discovery_FW_V1.0.1.zip 所包含的外设例程列表如下:
1 ADC_DMA
2 ADC_DualModeInterleaved
3 ADC_TripleModeInterleaved
4 DAC_SignalsGeneration
5 DMA2D_MemToMemWithBlending
6 DMA2D_MemToMemWithPFC
7 EXTI_Example
8 FLASH_DualBoot
9 FLASH_Program
10 FLASH_WriteProtection
11 FMC_SDRAM
12 FMC_SDRAM_LowPower
13 IWDG_Example
14 LTDC_AnimatedPictureFromUSB
15 LTDC_ColorKeying
16 LTDC_Display_2Layers
17 MEMS_Example
18 PWR_CurrentConsumption
19 PWR_STANDBY
20 PWR_STOP
21 RCC_ClockConfig
22 RCC_CSS
23 Release_Notes.html
24 SysTick_Example
25 TIM_PWMOutput
26 Touch_Panel
另外也有工作模板，但其驱动库为V1.3.0版本，而最新的STM32CubeMX软件生成的CMSIS层是V2.0.0版本，驱动库是HAL driver，版本是V1.0.0。由于HAL driver对数据类型改动较大，之前版本的外设驱动库库函数基本上不能再使用。例如GPIO模块，HAL driver对其改进很多，GPIO结构体增加了许多成员，从前需要好几个文件实现的功能，现在一个文件就可以实现了。HAL driver对之前外设驱动库的一些函数的功能也做了整合。可以通过查看STM32CubeMX软件对GPIO的配置来了解这一点。
本工程是利用最新的STM32CubeMX软件生成的EXTI_Example2点灯例程，和上述列表中的EXTI_Example例程功能完全相同，但使用的库不一样，初学者可以通过两个例程的对比，更深入的了解HAL driver库中GPIO相关的数据结构以及GPIO的各种配置，同时又能熟悉STM32CubeMX软件，通过简单的图形化配置，生成最新的标准化代码。
本工程中，除了几处添加注释的关键代码外，其它均为STM32CubeMX软件图形化配置生成，关键代码预览如下
1. main.c中的关键功能代码
/* Generate software interrupt: simulate a falling edge applied on EXTI0 line */
// HAL V1.0.0版本驱动库(CMSIS层版本是V2.0.0)，不能使用V1.3.0版本驱动库的stm32f4xx_exti.c文件
// EXTI_GenerateSWInterrupt(EXTI_Line13);
// 由于EXTI_GenerateSWInterrupt函数不能调用, 本工程增加了stm32f4xx_hal_gpio_exti驱动模块
// 软件产生一个中断,中断里红色LED的GPIO取反(闪烁红灯)
HAL_GPIO_EXTI_GenerateSWInterrupt(EXTI_Line13);
2. stm32f4xx_it.c 文件功能代码预览
/**
******************************************************************************
* @file stm32f4xx_it.c
* @date 02/06/2014 17:55:33
* @brief Interrupt Service Routines.
******************************************************************************
*
* COPYRIGHT(c) 2014 STMicroelectronics
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* 3. Neither the name of STMicroelectronics nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_hal.h"
#include "stm32f4xx.h"
#include "stm32f4xx_it.h"
#include "stm32f4xx_hal_gpio_exti.h" /* 2014.6.4 手动添加的头文件, 符合HAL驱动要求 */
/* External variables --------------------------------------------------------*/
/******************************************************************************/
/* Cortex-M4 Processor Interruption and Exception Handlers */
/******************************************************************************/
/**
* @brief This function handles EXTI Line[15:10] interrupts.
*/
void EXTI15_10_IRQHandler(void)
{
HAL_NVIC_ClearPendingIRQ(EXTI15_10_IRQn);
HAL_GPIO_TogglePin(GPIOG,GPIO_PIN_14); /* 2014.6.2 手动添加的代码, 红色LED的GPIO取反 */
HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_13);
}
/**
* @brief This function handles EXTI Line0 interrupt.
*/
void EXTI0_IRQHandler(void)
{
HAL_NVIC_ClearPendingIRQ(EXTI0_IRQn);
HAL_GPIO_TogglePin(GPIOG,GPIO_PIN_13); /* 2014.6.2 手动添加的代码, 绿色LED的GPIO取反 */
HAL_GPIO_EXTI_IRQHandler(GPIO_PIN_0);
}
/**
* @brief This function handles System tick timer.
*/
void SysTick_Handler(void)
{
HAL_IncTick();
TimingDelay_Decrement(); /* 2014.6.2 手动添加的代码, 计数减1 */
HAL_SYSTICK_IRQHandler();
}
3. stm32f4xx_hal_gpio_exti.c 增加的HAL driver 驱动模块
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
/**
******************************************************************************
* @file stm32f4xx_hal_gpio_exti.c
* @author wjandcf@gmail.com
* @version V1.0.0
* @date 2014.06.04
* @brief GPIO_EXTI HAL module driver.
*
@verbatim
==============================================================================
##### GPIO EXTI Peripheral features #####
==============================================================================
##### How to use this driver #####
==============================================================================
@endverbatim
******************************************************************************
* @attention
*
* © COPYRIGHT(c) 2014 STMicroelectronics
*
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include "stm32f4xx_hal.h"
/** @addtogroup STM32F4xx_HAL_Driver
* @{
*/
/** @defgroup GPIO_EXTI
* @brief GPIO_EXTI HAL module driver
* @{
*/
/* Private macro -------------------------------------------------------------*/
__IO uint32_t TimingDelay;
/**
* @brief Inserts a delay time.
* @param nTime: specifies the delay time length, in 10 ms.
* @retval None
*/
void Delay(__IO uint32_t nTime)
{
TimingDelay = nTime;
while(TimingDelay != 0);
}
/**
* @brief Decrements the TimingDelay variable.
* @param None
* @retval None
*/
void TimingDelay_Decrement(void)
{
if (TimingDelay != 0x00)
{
TimingDelay--;
}
}
#ifdef HAL_GPIO_EXTI_MODULE_ENABLED
/**
* @brief Generates a Software interrupt on selected EXTI line.
* @param EXTI_Line: specifies the EXTI line on which the software interrupt
* will be generated.
* This parameter can be any combination of EXTI_Linex where x can be (0..22)
* @retval None
*/
void HAL_GPIO_EXTI_GenerateSWInterrupt(uint32_t EXTI_Line)
{
/* Check the parameters */
assert_param(IS_EXTI_LINE(EXTI_Line));
EXTI->SWIER |= EXTI_Line;
}
#endif /* HAL_GPIO_EXTI_MODULE_ENABLED */
以下为STM32CubeMX软件图像化设置的过程【高清大图，登录后可见】
1.STM32F429I-Discovery开发板，芯片型号选择【高清大图，登录后可见】
2.STM32F429I-Discovery开发板，工作时钟和RTC时钟使能【高清大图，登录后可见】
3.STM32F429I-Discovery开发板，工作时钟和RTC时钟配置【高清大图，登录后可见】
最高可设置为180MHz，这里设置为8MHz
4.STM32F429I-Discovery开发板，GPIO时钟使能及工作模式选择【高清大图，登录后可见】
5.STM32F429I-Discovery开发板，GPIO中断配置。【高清大图，登录后可见】
(刚开始对HAL driver不熟悉，为了实现软件生成外部中断事件，花了不少周折)
设置为上升沿或下降沿中断，不能设置为上升沿和下降沿都中断，那样LED开了又关，看不到。
6.STM32F429I-Discovery开发板，GPIO中断使能【高清大图，登录后可见】
7.STM32F429I-Discovery开发板，代码生成设置，不要设置在磁盘根目录下。【高清大图，登录后可见】
STM32CubeMX软件生成的工程包下载地址（登陆后可见）:
EXTI_Example2.rar
(1.3 MB, 下载次数: 163)
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发表于 2014-6-4 21:38:26
楼主
谢谢网友支持。本例程有更新，增加了系统内核时钟和外设时钟的读取函数的调用。
