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.

  *

  *

© COPYRIGHT 2010 STMicroelectronics

  */ 

/* 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 %drn", file, line) */

  /* Infinite loop */

  while (1)

  {

  }

}

#endif

/**

  * @}

  */

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