STM8 GPIO 学习（驱动LED、Button）

STM8中GPIO寄存器有：输出寄存器（ODR），输入寄存器（IDR），方向寄存器（DDR），控制寄存器1（CR1）和控制寄存器2（CR2）.后面三个寄存器组和可以配置为8种GPIO的模式

定义如下：

/**
  * @brief General Purpose I/Os (GPIO)
  */
typedef struct GPIO_struct
{
  __IO uint8_t ODR; /*!< Output Data Register */
  __IO uint8_t IDR; /*!< Input Data Register */
  __IO uint8_t DDR; /*!< Data Direction Register */
  __IO uint8_t CR1; /*!< Configuration Register 1 */
  __IO uint8_t CR2; /*!< Configuration Register 2 */
}
GPIO_TypeDef;

相关的配置模式定义如下

/**
  * @defgroup GPIO_Modes
  *
  * @brief
  *     
  * Bits definitions:
  * - Bit 7: 0 = INPUT mode
  *          1 = OUTPUT mode
  *          1 = PULL-UP (input) or PUSH-PULL (output)
  * - Bit 5: 0 = No external interrupt (input) or No slope control (output)
  *          1 = External interrupt (input) or Slow control enabled (output)
  * - Bit 4: 0 = Low level (output)
  *          1 = High level (output push-pull) or HI-Z (output open-drain)
  * @{
  */
typedef enum
{
  GPIO_Mode_In_FL_No_IT      = (uint8_t)0x00,   /*!< Input floating, no external interrupt */
  GPIO_Mode_In_PU_No_IT      = (uint8_t)0x40,   /*!< Input pull-up, no external interrupt */
  GPIO_Mode_In_FL_IT         = (uint8_t)0x20,   /*!< Input floating, external interrupt */
  GPIO_Mode_In_PU_IT         = (uint8_t)0x60,   /*!< Input pull-up, external interrupt */
  GPIO_Mode_Out_OD_Low_Fast  = (uint8_t)0xA0,   /*!< Output open-drain, low level, 10MHz */
  GPIO_Mode_Out_PP_Low_Fast  = (uint8_t)0xE0,   /*!< Output push-pull, low level, 10MHz */
  GPIO_Mode_Out_OD_Low_Slow  = (uint8_t)0x80,   /*!< Output open-drain, low level, 2MHz */
  GPIO_Mode_Out_PP_Low_Slow  = (uint8_t)0xC0,   /*!< Output push-pull, low level, 2MHz */
  GPIO_Mode_Out_OD_HiZ_Fast  = (uint8_t)0xB0,   /*!< Output open-drain, high-impedance level, 10MHz */
  GPIO_Mode_Out_PP_High_Fast = (uint8_t)0xF0,   /*!< Output push-pull, high level, 10MHz */
  GPIO_Mode_Out_OD_HiZ_Slow  = (uint8_t)0x90,   /*!< Output open-drain, high-impedance level, 2MHz */
  GPIO_Mode_Out_PP_High_Slow = (uint8_t)0xD0    /*!< Output push-pull, high level, 2MHz */
}GPIO_Mode_TypeDef;

GPIO_Mode_In_FL_No_IT浮空输入无中断
Input floating, no external interrupt
GPIO_Mode_In_PU_No_I上拉输入无中断
Input pull-up, no external interrupt
GPIO_Mode_In_FL_IT 浮空输入有中断
Input floating, external interrupt
GPIO_Mode_In_PU_IT 上拉输入有中断
Input pull-up, external interrupt
GPIO_Mode_Out_OD_Low_Fast 
开漏-输出低-高速
Output open-drain, low level, 10MHz
GPIO_Mode_Out_PP_Low_Fast 
推挽-输出低-高速
Output push-pull, low level, 10MHz
GPIO_Mode_Out_OD_Low_Slow 
开漏-输出低-低速
Output open-drain, low level, 2MHz
GPIO_Mode_Out_PP_Low_Slow 
推挽-输出低-低速
Output push-pull, low level, 2MHz
GPIO_Mode_Out_OD_HiZ_Fast 
开漏-输出高阻-高速
Output open-drain, high-impedance level, 10MHz
GPIO_Mode_Out_PP_High_Fast 
推挽-输出高-高速
Output push-pull, high level, 10MHz
GPIO_Mode_Out_OD_HiZ_Slow 
开漏-输出高阻-低速
Output open-drain, high-impedance level, 2MHz
GPIO_Mode_Out_PP_High_Slow 
推挽-输出高-低速

GPIO的固件库函数如下所示：

 void GPIO_DeInit (GPIO_TypeDef *GPIOx) Deinitializes the GPIOx peripheral registers to their default reset values.
void GPIO_ExternalPullUpConfig (GPIO_TypeDef *GPIOx,uint8_t GPIO_Pin,FunctionalState NewState) Configures the external pull-up on GPIOx pins.
void GPIO_Init (GPIO_TypeDef *GPIOx,uint8_t GPIO_Pin,GPIO_Mode_TypeDef GPIO_Mode) Initializes the GPIOx according to the specified parameters.
uint8_t GPIO_ReadInputData (GPIO_TypeDef *GPIOx) Reads the specified GPIO input data port.
BitStatus GPIO_ReadInputDataBit (GPIO_TypeDef *GPIOx,GPIO_Pin_TypeDef GPIO_Pin) Reads the specified GPIO input data pin.
uint8_t GPIO_ReadOutputData (GPIO_TypeDef *GPIOx) Reads the specified GPIO output data port.
BitStatus GPIO_ReadOutputDataBit (GPIO_TypeDef *GPIOx,GPIO_Pin_TypeDef GPIO_Pin) Reads the specified GPIO Output data pin.
void GPIO_ResetBits (GPIO_TypeDef *GPIOx,uint8_t GPIO_Pin) Writes low level to the specified GPIO pins.
void GPIO_SetBits (GPIO_TypeDef *GPIOx,uint8_t GPIO_Pin) Writes high level to the specified GPIO pins.
void GPIO_ToggleBits (GPIO_TypeDef *GPIOx,uint8_t GPIO_Pin) Toggles the specified GPIO pins.
void GPIO_Write (GPIO_TypeDef *GPIOx,uint8_t GPIO_PortVal) Writes data to the specified GPIO data port.

void GPIO_WriteBit (GPIO_TypeDef *GPIOx,GPIO_Pin_TypeDef GPIO_Pin,BitAction GPIO_BitVal) Sets or clears the selected data port bit. 

下面是GPIO操作的应用，GPIO写操作---板上的两个LED灯闪烁的代码

/**
  ******************************************************************************
  * @file    Project/Template/main.c
  * @author  MCD Application Team
  * @version V1.3.0
  * @date    07/14/2010
  * @brief   Main program body
  ******************************************************************************
  * @copy
  *
  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
  * WITH CODING INFORMATION REGARDIN 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.
  *
  * <h2><center>&copy; COPYRIGHT 2010 STMicroelectronics</center></h2>
  */ 

/* Includes ------------------------------------------------------------------*/
#include "stm8l15x.h"


/** @addtogroup Template
  * @{
  */


/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
/* Private function prototypes -----------------------------------------------*/


/* Private functions ---------------------------------------------------------*/


/**
  * @brief  Main program.
  * @param  None
  * @retval None
  */


/*discover_board  MACROs for SET, RESET or TOGGLE Output port */
#define GPIO_HIGH(a,b) a->ODR|=b
#define GPIO_LOW(a,b) a->ODR&=~b
#define GPIO_TOGGLE(a,b) a->ODR^=b


#define BUTTON_GPIO_PORT GPIOC
#define USER_GPIO_PIN GPIO_Pin_1


#define LED_GREEN_PORT GPIOE
#define LED_GREEN_PIN GPIO_Pin_7
  
#define LED_BLUE_PORT GPIOC
#define LED_BLUE_PIN            GPIO_Pin_7


#define CTN_GPIO_PORT           GPIOC
#define CTN_CNTEN_GPIO_PIN      GPIO_Pin_4


#define WAKEUP_GPIO_PORT        GPIOE
#define ICC_WAKEUP_GPIO_PIN     GPIO_Pin_6
#define ICC_WAKEUP_EXTI_PIN     EXTI_Pin_3
void Delay(__IO uint16_t nCount)
{
   /* Decrement nCount value */
   while (nCount != 0)
   {
    nCount--;
   } 
}


void main(void)
{
  /* Infinite loop */
  GPIO_Init(LED_GREEN_PORT, LED_GREEN_PIN, GPIO_Mode_Out_PP_Low_Fast);
  GPIO_Init(LED_BLUE_PORT, LED_BLUE_PIN, GPIO_Mode_Out_PP_Low_Fast);
  while (1)
  {
    GPIO_ToggleBits(LED_GREEN_PORT, LED_GREEN_PIN);
    Delay(0xFFFF);
    GPIO_ToggleBits(LED_BLUE_PORT, LED_BLUE_PIN);
    Delay(0xFFFF);
  }
}


/**
  * @brief  Inserts a delay time.
  * @param  nCount: specifies the delay time length.
  * @retval None
  */


#ifdef  USE_FULL_ASSERT


/**
  * @brief  Reports the name of the source file and the source line number
  *   where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */


  /* Infinite loop */
  while (1)
  {
  }
}
#endif


/**
  * @}
  */


/******************* (C) COPYRIGHT 2010 STMicroelectronics *****END OF FILE****/