stm8s单片机（二）外部制止实验

制止优先级

stm8的制止优先级不是固定稳固的，stm8的制止分为硬件优先级与软件优先级；当多个制止发生时，cpu会先相应软件优先级高的制止，若软件优先级相同会先相应硬件优先级高的；
其中软件优先级有四个

1. /**
2.   * @brief  ITC Priority Levels selection
3.   */
4. typedef enum {
5.   ITC_PRIORITYLEVEL_0 = (uint8_t)0x02, /*!< Software priority level 0 (cannot be written) */
6.   ITC_PRIORITYLEVEL_1 = (uint8_t)0x01, /*!< Software priority level 1 */
7.   ITC_PRIORITYLEVEL_2 = (uint8_t)0x00, /*!< Software priority level 2 */
8.   ITC_PRIORITYLEVEL_3 = (uint8_t)0x03  /*!< Software priority level 3 */
9. } ITC_PriorityLevel_TypeDef;

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例子:

1. ITC_SetSoftwarePriority(ITC_IRQ_PORTE,ITC_PRIORITYLEVEL_2 );

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外部制止

stm8的全部io引脚都有外部制止本事；

IAR的制止处理声明

在固件库stm8s.h中可以找到这样一段代码

1. #ifdef _IAR_
2. #define STRINGVECTOR(x) #x
3. #define VECTOR_ID(x) STRINGVECTOR( vector = (x) )
4. #define INTERRUPT_HANDLER( a, b )  \
5. _Pragma( VECTOR_ID( (b)+2 ) )        \
6. __interrupt void (a)( void )
7. #define INTERRUPT_HANDLER_TRAP(a) \
8. _Pragma( VECTOR_ID( 1 ) ) \
9. __interrupt void (a) (void)  
10. #endif /* _IAR_ */

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例子:

1. INTERRUPT void EXTI_PORTE_IRQHandler(void);
3. INTERRUPT_HANDLER(EXTI_PORTE_IRQHandler, 7)
4. {
5.         if(KEY1==0)
6.         {
7.                 delay_ms(20);
8.                 while(KEY1==0);
9.                 LED1_TOGGLE;
10.         }
11.         if(KEY2==0)
12.         {
13.                 delay_ms(20);
14.                 while(KEY2==0);
15.                 LED2_TOGGLE;       
16.         }
17. }

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外部制止灵敏性(触发方式)

1. /**
2.   * @brief  EXTI Sensitivity values for PORTA to PORTE
3.   */
4. typedef enum {
5.   EXTI_SENSITIVITY_FALL_LOW  = (uint8_t)0x00, /*!< Interrupt on Falling edge and Low level */
6.   EXTI_SENSITIVITY_RISE_ONLY = (uint8_t)0x01, /*!< Interrupt on Rising edge only */
7.   EXTI_SENSITIVITY_FALL_ONLY = (uint8_t)0x02, /*!< Interrupt on Falling edge only */
8.   EXTI_SENSITIVITY_RISE_FALL = (uint8_t)0x03  /*!< Interrupt on Rising and Falling edges */
9. } EXTI_Sensitivity_TypeDef;

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Falling edge 是下降沿
Rising edge 是上升沿
使用例子:

1. EXTI_SetExtIntSensitivity(EXTI_PORT_GPIOE, EXTI_SENSITIVITY_FALL_ONLY);

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实验程序

使用一个GPIO来作外部制止有这几个步骤

• GPIO_Init
  
• EXTI_SetExtIntSensitivity
  
• ITC_SetSoftwarePriority
  
• INTERRUPT_HANDLER 定义制止处理
  
• enableInterrupts
  

1. #include "stm8s_gpio.h"#include "stm8s_itc.h"#include "stm8s_exti.h"bool pinn = FALSE;void delay(uint32_t delayTime);int main(void){  disableInterrupts();  GPIO_Init(GPIOA, GPIO_PIN_4, GPIO_MODE_OUT_PP_LOW_FAST);  GPIO_Init(GPIOE, GPIO_PIN_6, GPIO_MODE_IN_PU_IT);  EXTI_SetExtIntSensitivity(EXTI_PORT_GPIOE, EXTI_SENSITIVITY_FALL_ONLY);
3.   ITC_SetSoftwarePriority(ITC_IRQ_PORTE, ITC_PRIORITYLEVEL_3);  if (pinn == TRUE)  {    GPIO_WriteLow(GPIOA, GPIO_PIN_4);  }  else  {    GPIO_WriteHigh(GPIOA, GPIO_PIN_4);  }  enableInterrupts();  while (1)  {  }}void delay(uint32_t delayTime){  while (delayTime--)    ;}INTERRUPT void EXTI_PORTE_IRQHandler(void);INTERRUPT_HANDLER(EXTI_PORTE_IRQHandler, 7){  BitStatus status;  status = GPIO_ReadInputPin(GPIOE, GPIO_PIN_6);  if (status == RESET)  {    pinn = !pinn;    if (pinn == TRUE)    {      GPIO_WriteLow(GPIOA, GPIO_PIN_4);    }    else    {      GPIO_WriteHigh(GPIOA, GPIO_PIN_4);    }  }}

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