EDITORIAL:
This article aims to summarize the backup, to facilitate future inquiries, as is the personal summary, if wrong, please correct me; in addition, most of the content from the Internet, books, and various manuals, should please inform the infringement, immediately delete posts to apologize.
table of Contents
Second, the peripheral I / O configuration mode selection
Three, GPIO configuration code to achieve
Fourth, the total project realization
A, GPIO mode
The STM32 GPIO mode are the following:
- GPIO_Mode_AIN - Analog Input
- GPIO_Mode_IN_FLOATING - floating input
- GPIO_Mode_IPD - Input drop-down
- GPIO_Mode_IPU - pull input
- GPIO_Mode_Out_OD - open drain output
- GPIO_Mode_Out_PP - pull output
- GPIO_Mode_AF_OD - open drain multiplexing function
- GPIO_Mode_AF_PP - push-pull multiplexing function
typedef enum
{
GPIO_Mode_AIN = 0x0,
GPIO_Mode_IN_FLOATING = 0x04,
GPIO_Mode_IPD = 0x28,
GPIO_Mode_IPU = 0x48,
GPIO_Mode_Out_OD = 0x14,
GPIO_Mode_Out_PP = 0x10,
GPIO_Mode_AF_OD = 0x1C,
GPIO_Mode_AF_PP = 0x18
}GPIOMode_TypeDef;
For later reference code, in the above way GPIO paste pattern structure, you can also view the files stm32f10x_gpio.h
According to the above several models can be roughly divided into four modes: input, output, multiplexing, analog
Let's look at I / O port overall functional structure, and then subdivided
1, input
2, the output
3, reuse
4, simulation
Second, the peripheral I / O configuration mode selection
Three, GPIO configuration code to achieve
This example demonstrates only the input and output; further, later also eleven applications
1, the output of the push-pull output
/************************************************
函数名称 ： LED_Config
功 能 ： LED配置
参 数 ： 无
返 回 值 ： 无
*************************************************/
void LED_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
/* Configure PB.14 pin as output push pull */
GPIO_InitStructure.GPIO_Pin = LED_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(LED_GPIO_PORT, &GPIO_InitStructure);
}
2, an input on the input pull-
/************************************************
函数名称 ： Key_Config
功 能 ： 按键配置
参 数 ： 无
返 回 值 ： 无
*************************************************/
void Key_Config(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIOB clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
/* Enable AFIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
/* Configure PB.01 pin as input pull up */
GPIO_InitStructure.GPIO_Pin = KEY_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(KEY_GPIO_PORT, &GPIO_InitStructure);
/* Connect EXTI1 Line to PB.01 pin */
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource1);
/* Configure EXTI1 line */
EXTI_InitStructure.EXTI_Line = EXTI_Line1;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable the EXTI1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Generate software interrupt: simulate a falling edge applied on EXTI1 line */
EXTI_GenerateSWInterrupt(EXTI_Line1);
}
The above is some common I / O configuration; in the input, use the EXIT and NVIC two strange configuration, now you do not need to understand them in more detail later say
Fourth, the total project realization
bsp_gpio.c source file
#include "bsp_gpio.h"
/************************************************
函数名称 ： LED_Config
功 能 ： LED配置
参 数 ： 无
返 回 值 ： 无
*************************************************/
void LED_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
/* Configure PB.14 pin as output push pull */
GPIO_InitStructure.GPIO_Pin = LED_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_10MHz;
GPIO_Init(LED_GPIO_PORT, &GPIO_InitStructure);
LED_OFF;
}
/************************************************
函数名称 ： Key_Config
功 能 ： 按键配置
参 数 ： 无
返 回 值 ： 无
*************************************************/
void Key_Config(void)
{
EXTI_InitTypeDef EXTI_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIOB clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
/* Enable AFIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
/* Configure PB.01 pin as input pull up */
GPIO_InitStructure.GPIO_Pin = KEY_GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_Init(KEY_GPIO_PORT, &GPIO_InitStructure);
/* Connect EXTI1 Line to PB.01 pin */
GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource1);
/* Configure EXTI1 line */
EXTI_InitStructure.EXTI_Line = EXTI_Line1;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
/* Enable the EXTI1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Generate software interrupt: simulate a falling edge applied on EXTI1 line */
EXTI_GenerateSWInterrupt(EXTI_Line1);
}
/*---------------------------- END OF FILE ----------------------------*/
bsp_gpio.h header file
#ifndef __BSP_GPIO_H
#define __BSP_GPIO_H
#include "stm32f10x.h"
#define LED_GPIO_PORT GPIOB
#define LED_GPIO_PIN GPIO_Pin_14
#define LED_ON GPIO_ResetBits(GPIOB, GPIO_Pin_14)
#define LED_OFF GPIO_SetBits(GPIOB, GPIO_Pin_14)
#define KEY_GPIO_PORT GPIOB
#define KEY_GPIO_PIN GPIO_Pin_1
void LED_Config(void);
void Key_Config(void);
#endif /* __BSP_GPIO_H */
/*---------------------------- END OF FILE ----------------------------*/
stm32f10x_it.c source file
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x_it.h"
#include "bsp_gpio.h"
/******************************************************************************/
/* STM32F10x Peripherals Interrupt Handlers */
/******************************************************************************/
/**
* @brief This function handles External line 1 interrupt request.
* @param None
* @retval None
*/
void EXTI1_IRQHandler(void)
{
if(EXTI_GetITStatus(EXTI_Line1) != RESET)
{
if(GPIO_ReadInputDataBit(KEY_GPIO_PORT, KEY_GPIO_PIN) == RESET)
{
LED_OFF;
}
/* Clear the EXTI line 1 pending bit */
EXTI_ClearITPendingBit(EXTI_Line1);
}
}
main.c main function
/* Includes ------------------------------------------------------------------*/
#include "stm32f10x.h"
#include <stdio.h>
/************************************************
函数名称 ： main
功 能 ： 主函数入口
参 数 ： 无
返 回 值 ： 无
*************************************************/
int main(void)
{
/* Initial Configuration */
SystemInit();
/* -------- End -------- */
LED_ON;
/* Infinite loop */
while (1)
{
}
}
