STM32最新固件库v3.5/Libraries/CMSIS/CM3/DeviceSupport/ST/STM32F10x/system_stm32f10x.c · 林何/STM32F103C8 - 码云 - 开源中国 (gitee.com)
STM32最新固件库v3.5/Libraries/STM32F10x_StdPeriph_Driver/src/stm32f10x_gpio.c · 林何/STM32F103C8 - 码云 - 开源中国 (gitee.com)
1.宏定义
/* ------------ GPIO registers bit address in the alias region ----------------*/
//AFIO：复用寄存器
#define AFIO_OFFSET (AFIO_BASE - PERIPH_BASE)
/* --- EVENTCR Register -----*/
/* Alias word address of EVOE bit */
#define EVCR_OFFSET (AFIO_OFFSET + 0x00)
#define EVOE_BitNumber ((uint8_t)0x07)
#define EVCR_EVOE_BB (PERIPH_BB_BASE + (EVCR_OFFSET * 32) + (EVOE_BitNumber * 4))
/* --- MAPR Register ---*/
/* Alias word address of MII_RMII_SEL bit */
#define MAPR_OFFSET (AFIO_OFFSET + 0x04)
#define MII_RMII_SEL_BitNumber ((u8)0x17)
#define MAPR_MII_RMII_SEL_BB (PERIPH_BB_BASE + (MAPR_OFFSET * 32) + (MII_RMII_SEL_BitNumber * 4))
//位掩码
#define EVCR_PORTPINCONFIG_MASK ((uint16_t)0xFF80)
#define LSB_MASK ((uint16_t)0xFFFF)
#define DBGAFR_POSITION_MASK ((uint32_t)0x000F0000)
#define DBGAFR_SWJCFG_MASK ((uint32_t)0xF0FFFFFF)
#define DBGAFR_LOCATION_MASK ((uint32_t)0x00200000)
#define DBGAFR_NUMBITS_MASK ((uint32_t)0x00100000)2..GPIO模块标准库
1.GPIO_DeInit
/**
* @brief Deinitializes the GPIOx peripheral registers to their default reset values.
* @param GPIOx: where x can be (A..G) to select the GPIO peripheral.
* @retval None
*/
void GPIO_DeInit(GPIO_TypeDef* GPIOx)
{
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
if (GPIOx == GPIOA)
{
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOA, DISABLE);
}
else if (GPIOx == GPIOB)
{
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOB, ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOB, DISABLE);
}
else if (GPIOx == GPIOC)
{
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOC, ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOC, DISABLE);
}
else if (GPIOx == GPIOD)
{
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOD, ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOD, DISABLE);
}
else if (GPIOx == GPIOE)
{
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOE, ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOE, DISABLE);
}
else if (GPIOx == GPIOF)
{
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOF, ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOF, DISABLE);
}
else
{
if (GPIOx == GPIOG)
{
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOG, ENABLE);
RCC_APB2PeriphResetCmd(RCC_APB2Periph_GPIOG, DISABLE);
}
}
}
2.GPIO_Init
1.参数1：GPIO_TypeDef*
表示哪一个端口是（CRL还是CRH还是IDR）
记录的是寄存器地址
定义在system.stm32f10x.h中【因为外部可能要使用到】
2.参数2：GPIO_InitTypeDef*
描述对GPIO的初始化（形容词）
定义在gpio.h
/**
* @brief GPIO Init structure definition
*/
typedef struct
{
uint16_t GPIO_Pin; /*!< Specifies the GPIO pins to be configured.
This parameter can be any value of @ref GPIO_pins_define */
GPIOSpeed_TypeDef GPIO_Speed; /*!< Specifies the speed for the selected pins.
This parameter can be a value of @ref GPIOSpeed_TypeDef */
GPIOMode_TypeDef GPIO_Mode; /*!< Specifies the operating mode for the selected pins.
This parameter can be a value of @ref GPIOMode_TypeDef */
}GPIO_InitTypeDef;3.步骤1：GPIO Mode Configuration
输入模式全是0，输出模式全是1
速度初始化
/*---------------------------- GPIO Mode Configuration -----------------------*/
//取出bit0-bit3
currentmode = ((uint32_t)GPIO_InitStruct->GPIO_Mode) & ((uint32_t)0x0F);
if ((((uint32_t)GPIO_InitStruct->GPIO_Mode) & ((uint32_t)0x10)) != 0x00)
//判断出等于1（输出模式）的进入
{
/* Check the parameters */
assert_param(IS_GPIO_SPEED(GPIO_InitStruct->GPIO_Speed));
/* Output mode */
currentmode |= (uint32_t)GPIO_InitStruct->GPIO_Speed;
}4.步骤2：GPIO CRL Configuration
/*---------------------------- GPIO CRL Configuration ------------------------*/
/* Configure the eight low port pins */
//判断此时的控制器在CRL（bit0-bit7）还是CRH（bit7-bit15）
if (((uint32_t)GPIO_InitStruct->GPIO_Pin & ((uint32_t)0x00FF)) != 0x00)
//如果进入表示bit0-bit7有为1的，则表示要使用CRL
{
tmpreg = GPIOx->CRL;
//pinpos < 0x08：表示从bit0-bit7开始找
for (pinpos = 0x00; pinpos < 0x08; pinpos++)
{
pos = ((uint32_t)0x01) << pinpos;
/* Get the port pins position */
//判断当前的Pin是哪一个
currentpin = (GPIO_InitStruct->GPIO_Pin) & pos;
if (currentpin == pos)//表示这位Pin是1，找到了
{
pos = pinpos << 2;
/* Clear the corresponding low control register bits */
pinmask = ((uint32_t)0x0F) << pos;
tmpreg &= ~pinmask;//清零
/* Write the mode configuration in the corresponding bits */
tmpreg |= (currentmode << pos);
/* Reset the corresponding ODR bit */
if (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPD)
{
GPIOx->BRR = (((uint32_t)0x01) << pinpos);
}
else
{
/* Set the corresponding ODR bit */
if (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPU)
{
GPIOx->BSRR = (((uint32_t)0x01) << pinpos);
}
}
}
}
GPIOx->CRL = tmpreg;
}
5.步骤3：GPIO CRH Configuration
/*---------------------------- GPIO CRH Configuration ------------------------*/
/* Configure the eight high port pins */
if (GPIO_InitStruct->GPIO_Pin > 0x00FF)
{
tmpreg = GPIOx->CRH;
for (pinpos = 0x00; pinpos < 0x08; pinpos++)
{
pos = (((uint32_t)0x01) << (pinpos + 0x08));
/* Get the port pins position */
currentpin = ((GPIO_InitStruct->GPIO_Pin) & pos);
if (currentpin == pos)
{
pos = pinpos << 2;
/* Clear the corresponding high control register bits */
pinmask = ((uint32_t)0x0F) << pos;
tmpreg &= ~pinmask;
/* Write the mode configuration in the corresponding bits */
tmpreg |= (currentmode << pos);
/* Reset the corresponding ODR bit */
if (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPD)
{
GPIOx->BRR = (((uint32_t)0x01) << (pinpos + 0x08));
}
/* Set the corresponding ODR bit */
if (GPIO_InitStruct->GPIO_Mode == GPIO_Mode_IPU)
{
GPIOx->BSRR = (((uint32_t)0x01) << (pinpos + 0x08));
}
}
}
GPIOx->CRH = tmpreg;
}3.GPIO_StructInit
对GPIO初始化类型
GPIO_Pin_All：是用于判断此时这个GPIO是否初始化
/**
* @brief Fills each GPIO_InitStruct member with its default value.
* @param GPIO_InitStruct : pointer to a GPIO_InitTypeDef structure which will
* be initialized.
* @retval None
*/
void GPIO_StructInit(GPIO_InitTypeDef* GPIO_InitStruct)
{
/* Reset GPIO init structure parameters values */
//GPIO_Pin_All:表示此时初始化到的这个pin是不存在的，表示此时还未指向
GPIO_InitStruct->GPIO_Pin = GPIO_Pin_All;
GPIO_InitStruct->GPIO_Speed = GPIO_Speed_2MHz;
GPIO_InitStruct->GPIO_Mode = GPIO_Mode_IN_FLOATING;
}4.GPIO_ReadInputDataBit
读取哪一个引脚的值
/**
* @brief Reads the specified input port pin.
* @param GPIOx: where x can be (A..G) to select the GPIO peripheral.
* @param GPIO_Pin: specifies the port bit to read.
* This parameter can be GPIO_Pin_x where x can be (0..15).
* @retval The input port pin value.
*/
uint8_t GPIO_ReadInputDataBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
uint8_t bitstatus = 0x00;
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
assert_param(IS_GET_GPIO_PIN(GPIO_Pin));
if ((GPIOx->IDR & GPIO_Pin) != (uint32_t)Bit_RESET)
{
bitstatus = (uint8_t)Bit_SET;
}
else
{
bitstatus = (uint8_t)Bit_RESET;
}
return bitstatus;
}5.GPIO_ReadInputData
读取整个端口
/**
* @brief Reads the specified GPIO input data port.
* @param GPIOx: where x can be (A..G) to select the GPIO peripheral.
* @retval GPIO input data port value.
*/
uint16_t GPIO_ReadInputData(GPIO_TypeDef* GPIOx)
{
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
return ((uint16_t)GPIOx->IDR);
}6.GPIO_ReadOutputDataBit/GPIO_ReadOutputData
/**
* @brief Reads the specified output data port bit.
* @param GPIOx: where x can be (A..G) to select the GPIO peripheral.
* @param GPIO_Pin: specifies the port bit to read.
* This parameter can be GPIO_Pin_x where x can be (0..15).
* @retval The output port pin value.
*/
uint8_t GPIO_ReadOutputDataBit(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
{
uint8_t bitstatus = 0x00;
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
assert_param(IS_GET_GPIO_PIN(GPIO_Pin));
if ((GPIOx->ODR & GPIO_Pin) != (uint32_t)Bit_RESET)
{
bitstatus = (uint8_t)Bit_SET;
}
else
{
bitstatus = (uint8_t)Bit_RESET;
}
return bitstatus;
}
/**
* @brief Reads the specified GPIO output data port.
* @param GPIOx: where x can be (A..G) to select the GPIO peripheral.
* @retval GPIO output data port value.
*/
uint16_t GPIO_ReadOutputData(GPIO_TypeDef* GPIOx)
{
/* Check the parameters */
assert_param(IS_GPIO_ALL_PERIPH(GPIOx));
return ((uint16_t)GPIOx->ODR);
}7. GPIO_EventOutputConfig
/**
* @brief Selects the GPIO pin used as Event output.
* @param GPIO_PortSource: selects the GPIO port to be used as source
* for Event output.
* This parameter can be GPIO_PortSourceGPIOx where x can be (A..E).
* @param GPIO_PinSource: specifies the pin for the Event output.
* This parameter can be GPIO_PinSourcex where x can be (0..15).
* @retval None
*/
void GPIO_EventOutputConfig(uint8_t GPIO_PortSource, uint8_t GPIO_PinSource)
{
uint32_t tmpreg = 0x00;
/* Check the parameters */
assert_param(IS_GPIO_EVENTOUT_PORT_SOURCE(GPIO_PortSource));
assert_param(IS_GPIO_PIN_SOURCE(GPIO_PinSource));
tmpreg = AFIO->EVCR;
/* Clear the PORT[6:4] and PIN[3:0] bits */
tmpreg &= EVCR_PORTPINCONFIG_MASK;
tmpreg |= (uint32_t)GPIO_PortSource << 0x04;
tmpreg |= GPIO_PinSource;
AFIO->EVCR = tmpreg;
}
8.GPIO_PinRemapConfig
当我们要使用的引脚不够时，就要将其他不需要使用到的引脚进行复用
void GPIO_PinRemapConfig(uint32_t GPIO_Remap, FunctionalState NewState)
{
uint32_t tmp = 0x00, tmp1 = 0x00, tmpreg = 0x00, tmpmask = 0x00;
/* Check the parameters */
assert_param(IS_GPIO_REMAP(GPIO_Remap));
assert_param(IS_FUNCTIONAL_STATE(NewState));
if((GPIO_Remap & 0x80000000) == 0x80000000)
{
tmpreg = AFIO->MAPR2;
}
else
{
tmpreg = AFIO->MAPR;
}
tmpmask = (GPIO_Remap & DBGAFR_POSITION_MASK) >> 0x10;
tmp = GPIO_Remap & LSB_MASK;
if ((GPIO_Remap & (DBGAFR_LOCATION_MASK | DBGAFR_NUMBITS_MASK)) == (DBGAFR_LOCATION_MASK | DBGAFR_NUMBITS_MASK))
{
tmpreg &= DBGAFR_SWJCFG_MASK;
AFIO->MAPR &= DBGAFR_SWJCFG_MASK;
}
else if ((GPIO_Remap & DBGAFR_NUMBITS_MASK) == DBGAFR_NUMBITS_MASK)
{
tmp1 = ((uint32_t)0x03) << tmpmask;
tmpreg &= ~tmp1;
tmpreg |= ~DBGAFR_SWJCFG_MASK;
}
else
{
tmpreg &= ~(tmp << ((GPIO_Remap >> 0x15)*0x10));
tmpreg |= ~DBGAFR_SWJCFG_MASK;
}
if (NewState != DISABLE)
{
tmpreg |= (tmp << ((GPIO_Remap >> 0x15)*0x10));
}
if((GPIO_Remap & 0x80000000) == 0x80000000)
{
AFIO->MAPR2 = tmpreg;
}
else
{
AFIO->MAPR = tmpreg;
}
}9.GPIO_EXTILineConfig
与外部中断有关
/**
* @brief Selects the GPIO pin used as EXTI Line.
* @param GPIO_PortSource: selects the GPIO port to be used as source for EXTI lines.
* This parameter can be GPIO_PortSourceGPIOx where x can be (A..G).
* @param GPIO_PinSource: specifies the EXTI line to be configured.
* This parameter can be GPIO_PinSourcex where x can be (0..15).
* @retval None
*/
void GPIO_EXTILineConfig(uint8_t GPIO_PortSource, uint8_t GPIO_PinSource)
{
uint32_t tmp = 0x00;
/* Check the parameters */
assert_param(IS_GPIO_EXTI_PORT_SOURCE(GPIO_PortSource));
assert_param(IS_GPIO_PIN_SOURCE(GPIO_PinSource));
tmp = ((uint32_t)0x0F) << (0x04 * (GPIO_PinSource & (uint8_t)0x03));
AFIO->EXTICR[GPIO_PinSource >> 0x02] &= ~tmp;
AFIO->EXTICR[GPIO_PinSource >> 0x02] |= (((uint32_t)GPIO_PortSource) << (0x04 * (GPIO_PinSource & (uint8_t)0x03)));
}3.使用GPIO库函数点亮LED
1.接线
我们连接的是GPIOB8-GPIOB15
注意点：我们这里是反着接的【要将引脚一一对应】
2.代码实现
#include "led.h"
#include "stm32f10x.h" // Device header
static void delay(){
unsigned int i=0,j=0;
for(i=0;i<1000;i++){
for(j=0;j<2000;j++){
}
}
}
/*
void led_init(){
//因为RCC部分还没有定义结构体，所以还是按照原来的方式去操作
RCC->APB2ENR = 0x00000008;
GPIOB->CRH=0x33333333;
GPIOB->ODR=0x00000000;
}
void delay(){
unsigned int i=0,j=0;
for(i=0;i<1000;i++){
for(j=0;j<2000;j++){
}
}
}
void led_flash(void){
unsigned int i=0;
for(i=0;i<3;i++){
GPIOB->ODR = 0x00000000;//全亮
delay();
GPIOB->ODR = 0x0000ff00;//全灭
delay();
}
}
*/
//硬件实际用到的是GPIOB8-GPIOB15
//使用标准库中的GPIO进行封装API来进行GPIO设置，以点亮LED
//定义一个结构体：描述GPIO的速度，频率等
GPIO_InitTypeDef gpio_InitStructure;
/**
注意点:如果我们没有去操纵某一个引脚的时候
默认上电后，灯全部亮
*/
void led_init(){
//一、通过GPIO初始化来实现
//记得一定要加上时钟
RCC->APB2ENR=0x00000008;
//单独设置
//实际操纵寄存器去将GPB8设置为推挽输出模式，并且速率50MHZ
gpio_InitStructure.GPIO_Pin=GPIO_Pin_9;
gpio_InitStructure.GPIO_Speed=GPIO_Speed_2MHz;
gpio_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP;
//void GPIO_Init(GPIO_TypeDef* GPIOx, GPIO_InitTypeDef* GPIO_InitStruct)
GPIO_Init(GPIOB,&gpio_InitStructure);
//二、设置LED亮，则需要输出模式
//此时操纵一个引脚
//操纵BSRR寄存器设置GPB8输出1，让LED点亮
//void GPIO_SetBits(GPIO_TypeDef* GPIOx, uint16_t GPIO_Pin)
GPIO_SetBits(GPIOB,GPIO_Pin_9);
}
void led_flash(){
unsigned int i=0;
for(i=0;i<3;i++){
GPIO_SetBits(GPIOB,GPIO_Pin_9);//GPB9亮
delay();
GPIO_SetBits(GPIOB,GPIO_Pin_9);//GPB9灭
delay();
}
}
