CC2541的按键

转自：http://blog.csdn.net/haozi0_0/article/details/48178213

最近在调试 CC2541 的按键消息，查看了好久才找到如何产生消息。

1. 首先当然将配置 I\O 配置成按键中断，然后当按键按下时，会进入中断处理函数

 HAL_ISR_FUNCTION( halKeyPort2Isr, P2INT_VECTOR )//进入中断
 {
   HAL_ENTER_ISR();

   if (HAL_KEY_JOY_MOVE_PXIFG & HAL_KEY_JOY_MOVE_BIT)
   {
     halProcessKeyInterrupt();
   }

   /*
     Clear the CPU interrupt flag for Port_2
     PxIFG has to be cleared before PxIF
     Notes: P2_1 and P2_2 are debug lines.
   */
   HAL_KEY_JOY_MOVE_PXIFG = 0;
   HAL_KEY_CPU_PORT_2_IF = 0;

   CLEAR_SLEEP_MODE();

   HAL_EXIT_ISR();

 void halProcessKeyInterrupt (void)//中断处理函数
 {
   bool valid=FALSE;

 #if defined ( CC2540_MINIDK )
   if( HAL_KEY_SW_1_PXIFG & HAL_KEY_SW_1_BIT) /* Interrupt Flag has been set by SW1 */
   {
     HAL_KEY_SW_1_PXIFG = ~(HAL_KEY_SW_1_BIT); /* Clear Interrupt Flag */
     valid = TRUE;
   }

   if (HAL_KEY_SW_2_PXIFG & HAL_KEY_SW_2_BIT)  /* Interrupt Flag has been set by SW2 */
   {
     HAL_KEY_SW_2_PXIFG = ~(HAL_KEY_SW_2_BIT); /* Clear Interrupt Flag */
     valid = TRUE;
   }
 #else
   if (HAL_KEY_SW_6_PXIFG & HAL_KEY_SW_6_BIT)  /* Interrupt Flag has been set */
   {
     HAL_KEY_SW_6_PXIFG = ~(HAL_KEY_SW_6_BIT); /* Clear Interrupt Flag */
     valid = TRUE;
   }

   if (HAL_KEY_JOY_MOVE_PXIFG & HAL_KEY_JOY_MOVE_BIT)  /* Interrupt Flag has been set */
   {
     HAL_KEY_JOY_MOVE_PXIFG = ~(HAL_KEY_JOY_MOVE_BIT); /* Clear Interrupt Flag */
     valid = TRUE;
   }
 #endif
   if (u8_wechatWriteCharFlag == UNPACK_CONTINUOUS)
   {
   #ifdef UART_DEBUG
     print_msg("halProcessKeyInterrupt return \r\n" );
   #endif
     return;
   }


   if (valid)
   {
     osal_start_timerEx (Hal_TaskID, HAL_KEY_EVENT, HAL_KEY_DEBOUNCE_VALUE);
   }
 }

2. 上面程序最后会进入 Hal_TaskID 任务的 HAL_KEY_EVENT

 if (events & HAL_KEY_EVENT)
   {
 #if (defined HAL_KEY) && (HAL_KEY == TRUE)
     /* Check for keys */
     HalKeyPoll();  //处理按键

     /* if interrupt disabled, do next polling */
     if (!Hal_KeyIntEnable)
     {
       osal_start_timerEx( Hal_TaskID, HAL_KEY_EVENT, 100);
     }
 #endif
     return events ^ HAL_KEY_EVENT;
   }

3. 在 HalKeyPoll 函数中，会把按键产生的消息赋值给 keys 等参数，最后传递给 pHalKeyProcessFunction，并产生消息

 void HalKeyPoll (void)
 {
   uint8 keys = 0;
   uint8 notify = 0;
   if (u8_wechatWriteCharFlag == UNPACK_CONTINUOUS)
   {
     #ifdef UART_DEBUG
     print_msg("HalKeyPoll return \r\n" );
     #endif
     return;
   }
 #if defined (CC2540_MINIDK)
   if (!(HAL_KEY_SW_1_PORT & HAL_KEY_SW_1_BIT))    /* Key is active low */
   {
     keys |= HAL_KEY_SW_1;
   }
   if (!(HAL_KEY_SW_2_PORT & HAL_KEY_SW_2_BIT))    /* Key is active low */
   {
     keys |= HAL_KEY_SW_2;
   }
 #else
   if (!(HAL_KEY_SW_6_PORT & HAL_KEY_SW_6_BIT))    /* Key is active low */
   {
     keys |= HAL_KEY_SW_6;
   }

   if ((HAL_KEY_JOY_MOVE_PORT & HAL_KEY_JOY_MOVE_BIT))  /* Key is active HIGH */
   {
     keys = halGetJoyKeyInput();
   }
 #endif

   /* If interrupts are not enabled, previous key status and current key status
    * are compared to find out if a key has changed status.
    */
   if (!Hal_KeyIntEnable)
   {
     if (keys == halKeySavedKeys)
     {
       /* Exit - since no keys have changed */
       return;
     }
     else
     {
       notify = 1;
     }
   }
   else
   {
     /* Key interrupt handled here */
     if (keys)
     {
       notify = 1;
     }
   }

   /* Store the current keys for comparation next time */
   halKeySavedKeys = keys;

   /* Invoke Callback if new keys were depressed */
   if (notify && (pHalKeyProcessFunction))
   {
     (pHalKeyProcessFunction) (keys, HAL_KEY_STATE_NORMAL); //产生消息

   }
 }

4. 在产生消息之前，先将回调函数设置完成

 HalKeyConfig( OnboardKeyIntEnable, OnBoard_KeyCallback);

 void HalKeyConfig (bool interruptEnable, halKeyCBack_t cback)
 {
   /* Enable/Disable Interrupt or */
   Hal_KeyIntEnable = interruptEnable;

   /* Register the callback fucntion */
   pHalKeyProcessFunction = cback;  <span style="font-family: Arial, Helvetica, sans-serif;">// </span><span style="font-family: Arial, Helvetica, sans-serif;">pHalKeyProcessFunction  == </span><span style="font-family: Arial, Helvetica, sans-serif;">OnBoard_KeyCallback</span>

   /* Determine if interrupt is enable or not */
   if (Hal_KeyIntEnable)
   {
 #if defined ( CC2540_MINIDK )
     HAL_KEY_SW_1_ICTL |= HAL_KEY_SW_1_ICTLBIT; /* enable interrupt generation at port */
     HAL_KEY_SW_1_PXIFG = ~(HAL_KEY_SW_1_BIT);  /* Clear any pending interrupt */
     HAL_KEY_SW_2_ICTL |= HAL_KEY_SW_2_ICTLBIT; /* enable interrupt generation at port */
     HAL_KEY_SW_2_PXIFG = ~(HAL_KEY_SW_2_BIT);  /* Clear any pending interrupt */

 #else
     /* Rising/Falling edge configuratinn */
     PICTL &= ~(HAL_KEY_SW_6_EDGEBIT);    /* Clear the edge bit */
     /* For falling edge, the bit must be set. */
   #if (HAL_KEY_SW_6_EDGE == HAL_KEY_FALLING_EDGE)
     PICTL |= HAL_KEY_SW_6_EDGEBIT;
   #endif


     /* Interrupt configuration:
      * - Enable interrupt generation at the port
      * - Enable CPU interrupt
      * - Clear any pending interrupt
      */
     HAL_KEY_SW_6_ICTL |= HAL_KEY_SW_6_ICTLBIT;
     HAL_KEY_SW_6_IEN |= HAL_KEY_SW_6_IENBIT;
     HAL_KEY_SW_6_PXIFG = ~(HAL_KEY_SW_6_BIT);

     /* Rising/Falling edge configuratinn */
     HAL_KEY_JOY_MOVE_ICTL &= ~(HAL_KEY_JOY_MOVE_EDGEBIT);    /* Clear the edge bit */
     /* For falling edge, the bit must be set. */
   #if (HAL_KEY_JOY_MOVE_EDGE == HAL_KEY_FALLING_EDGE)
     HAL_KEY_JOY_MOVE_ICTL |= HAL_KEY_JOY_MOVE_EDGEBIT;
   #endif


     /* Interrupt configuration:
      * - Enable interrupt generation at the port
      * - Enable CPU interrupt
      * - Clear any pending interrupt
      */
     HAL_KEY_JOY_MOVE_ICTL |= HAL_KEY_JOY_MOVE_ICTLBIT;
     HAL_KEY_JOY_MOVE_IEN |= HAL_KEY_JOY_MOVE_IENBIT;
     HAL_KEY_JOY_MOVE_PXIFG = ~(HAL_KEY_JOY_MOVE_BIT);
 #endif // !CC2540_MINIDK

     /* Do this only after the hal_key is configured - to work with sleep stuff */
     if (HalKeyConfigured == TRUE)
     {
       osal_stop_timerEx(Hal_TaskID, HAL_KEY_EVENT);  /* Cancel polling if active */
     }
   }
   else    /* Interrupts NOT enabled */
   {
 #if defined ( CC2540_MINIDK )
     HAL_KEY_SW_1_ICTL &= ~(HAL_KEY_SW_1_ICTLBIT); /* don't generate interrupt */
     HAL_KEY_SW_2_ICTL &= ~(HAL_KEY_SW_2_ICTLBIT); /* don't generate interrupt */
 #else
     HAL_KEY_SW_6_ICTL &= ~(HAL_KEY_SW_6_ICTLBIT); /* don't generate interrupt */
     HAL_KEY_SW_6_IEN &= ~(HAL_KEY_SW_6_IENBIT);   /* Clear interrupt enable bit */
 #endif  // !CC2540_MINIDK

     osal_set_event(Hal_TaskID, HAL_KEY_EVENT);
   }

   /* Key now is configured */
   HalKeyConfigured = TRUE;
 }

 void OnBoard_KeyCallback ( uint8 keys, uint8 state )  //产生消息
 {
   uint8 shift;
   (void)state;
     #ifdef UART_DEBUG
     print_msg("OnBoard_KeyCallback \r\n" );
     #endif
   if (u8_wechatWriteCharFlag == UNPACK_CONTINUOUS  ||
     ((SwitchBackgroud == EEVO_enterBackground) || (SwitchBackgroud == EEVO_sleep)))
   {
     #ifdef UART_DEBUG
     print_msg("KeyCallback return \r\n" );
     #endif

     return;
   }
   // shift key (S1) is used to generate key interrupt
   // applications should not use S1 when key interrupt is enabled
   shift = (OnboardKeyIntEnable == HAL_KEY_INTERRUPT_ENABLE) ? false : ((keys & HAL_KEY_SW_6) ? true : false);

   if ( OnBoard_SendKeys( keys, shift ) != SUCCESS )
   {
     // Process SW1 here
     if ( keys & HAL_KEY_SW_1 )  // Switch 1
     {
     }
     // Process SW2 here
     if ( keys & HAL_KEY_SW_2 )  // Switch 2
     {
     }
     // Process SW3 here
     if ( keys & HAL_KEY_SW_3 )  // Switch 3
     {
     }
     // Process SW4 here
     if ( keys & HAL_KEY_SW_4 )  // Switch 4
     {
     }
     // Process SW5 here
     if ( keys & HAL_KEY_SW_5 )  // Switch 5
     {
     }
     // Process SW6 here
     if ( keys & HAL_KEY_SW_6 )  // Switch 6
     {
     }
   }

   /* If any key is currently pressed down and interrupt
      is still enabled, disable interrupt and switch to polling */
   if( keys != 0 )
   {
     if( OnboardKeyIntEnable == HAL_KEY_INTERRUPT_ENABLE )
     {
       OnboardKeyIntEnable = HAL_KEY_INTERRUPT_DISABLE;
       HalKeyConfig( OnboardKeyIntEnable, OnBoard_KeyCallback);
     }
   }
   /* If no key is currently pressed down and interrupt
      is disabled, enable interrupt and turn off polling */
   else
   {
     if( OnboardKeyIntEnable == HAL_KEY_INTERRUPT_DISABLE )
     {
       OnboardKeyIntEnable = HAL_KEY_INTERRUPT_ENABLE;
       HalKeyConfig( OnboardKeyIntEnable, OnBoard_KeyCallback);
     }
   }

最近在调试 CC2541 的按键消息，查看了好久才找到如何产生消息。

1. 首先当然将配置 I\O 配置成按键中断，然后当按键按下时，会进入中断处理函数

 HAL_ISR_FUNCTION( halKeyPort2Isr, P2INT_VECTOR )//进入中断
 {
   HAL_ENTER_ISR();

   if (HAL_KEY_JOY_MOVE_PXIFG & HAL_KEY_JOY_MOVE_BIT)
   {
     halProcessKeyInterrupt();
   }

   /*
     Clear the CPU interrupt flag for Port_2
     PxIFG has to be cleared before PxIF
     Notes: P2_1 and P2_2 are debug lines.
   */
   HAL_KEY_JOY_MOVE_PXIFG = 0;
   HAL_KEY_CPU_PORT_2_IF = 0;

   CLEAR_SLEEP_MODE();

   HAL_EXIT_ISR();

 void halProcessKeyInterrupt (void)//中断处理函数
 {
   bool valid=FALSE;

 #if defined ( CC2540_MINIDK )
   if( HAL_KEY_SW_1_PXIFG & HAL_KEY_SW_1_BIT) /* Interrupt Flag has been set by SW1 */
   {
     HAL_KEY_SW_1_PXIFG = ~(HAL_KEY_SW_1_BIT); /* Clear Interrupt Flag */
     valid = TRUE;
   }

   if (HAL_KEY_SW_2_PXIFG & HAL_KEY_SW_2_BIT)  /* Interrupt Flag has been set by SW2 */
   {
     HAL_KEY_SW_2_PXIFG = ~(HAL_KEY_SW_2_BIT); /* Clear Interrupt Flag */
     valid = TRUE;
   }
 #else
   if (HAL_KEY_SW_6_PXIFG & HAL_KEY_SW_6_BIT)  /* Interrupt Flag has been set */
   {
     HAL_KEY_SW_6_PXIFG = ~(HAL_KEY_SW_6_BIT); /* Clear Interrupt Flag */
     valid = TRUE;
   }

   if (HAL_KEY_JOY_MOVE_PXIFG & HAL_KEY_JOY_MOVE_BIT)  /* Interrupt Flag has been set */
   {
     HAL_KEY_JOY_MOVE_PXIFG = ~(HAL_KEY_JOY_MOVE_BIT); /* Clear Interrupt Flag */
     valid = TRUE;
   }
 #endif
   if (u8_wechatWriteCharFlag == UNPACK_CONTINUOUS)
   {
   #ifdef UART_DEBUG
     print_msg("halProcessKeyInterrupt return \r\n" );
   #endif
     return;
   }


   if (valid)
   {
     osal_start_timerEx (Hal_TaskID, HAL_KEY_EVENT, HAL_KEY_DEBOUNCE_VALUE);
   }
 }

2. 上面程序最后会进入 Hal_TaskID 任务的 HAL_KEY_EVENT

 if (events & HAL_KEY_EVENT)
   {
 #if (defined HAL_KEY) && (HAL_KEY == TRUE)
     /* Check for keys */
     HalKeyPoll();  //处理按键

     /* if interrupt disabled, do next polling */
     if (!Hal_KeyIntEnable)
     {
       osal_start_timerEx( Hal_TaskID, HAL_KEY_EVENT, 100);
     }
 #endif
     return events ^ HAL_KEY_EVENT;
   }

3. 在 HalKeyPoll 函数中，会把按键产生的消息赋值给 keys 等参数，最后传递给 pHalKeyProcessFunction，并产生消息

 void HalKeyPoll (void)
 {
   uint8 keys = 0;
   uint8 notify = 0;
   if (u8_wechatWriteCharFlag == UNPACK_CONTINUOUS)
   {
     #ifdef UART_DEBUG
     print_msg("HalKeyPoll return \r\n" );
     #endif
     return;
   }
 #if defined (CC2540_MINIDK)
   if (!(HAL_KEY_SW_1_PORT & HAL_KEY_SW_1_BIT))    /* Key is active low */
   {
     keys |= HAL_KEY_SW_1;
   }
   if (!(HAL_KEY_SW_2_PORT & HAL_KEY_SW_2_BIT))    /* Key is active low */
   {
     keys |= HAL_KEY_SW_2;
   }
 #else
   if (!(HAL_KEY_SW_6_PORT & HAL_KEY_SW_6_BIT))    /* Key is active low */
   {
     keys |= HAL_KEY_SW_6;
   }

   if ((HAL_KEY_JOY_MOVE_PORT & HAL_KEY_JOY_MOVE_BIT))  /* Key is active HIGH */
   {
     keys = halGetJoyKeyInput();
   }
 #endif

   /* If interrupts are not enabled, previous key status and current key status
    * are compared to find out if a key has changed status.
    */
   if (!Hal_KeyIntEnable)
   {
     if (keys == halKeySavedKeys)
     {
       /* Exit - since no keys have changed */
       return;
     }
     else
     {
       notify = 1;
     }
   }
   else
   {
     /* Key interrupt handled here */
     if (keys)
     {
       notify = 1;
     }
   }

   /* Store the current keys for comparation next time */
   halKeySavedKeys = keys;

   /* Invoke Callback if new keys were depressed */
   if (notify && (pHalKeyProcessFunction))
   {
     (pHalKeyProcessFunction) (keys, HAL_KEY_STATE_NORMAL); //产生消息

   }
 }

4. 在产生消息之前，先将回调函数设置完成

 HalKeyConfig( OnboardKeyIntEnable, OnBoard_KeyCallback);

 void HalKeyConfig (bool interruptEnable, halKeyCBack_t cback)
 {
   /* Enable/Disable Interrupt or */
   Hal_KeyIntEnable = interruptEnable;

   /* Register the callback fucntion */
   pHalKeyProcessFunction = cback;  <span style="font-family: Arial, Helvetica, sans-serif;">// </span><span style="font-family: Arial, Helvetica, sans-serif;">pHalKeyProcessFunction  == </span><span style="font-family: Arial, Helvetica, sans-serif;">OnBoard_KeyCallback</span>

   /* Determine if interrupt is enable or not */
   if (Hal_KeyIntEnable)
   {
 #if defined ( CC2540_MINIDK )
     HAL_KEY_SW_1_ICTL |= HAL_KEY_SW_1_ICTLBIT; /* enable interrupt generation at port */
     HAL_KEY_SW_1_PXIFG = ~(HAL_KEY_SW_1_BIT);  /* Clear any pending interrupt */
     HAL_KEY_SW_2_ICTL |= HAL_KEY_SW_2_ICTLBIT; /* enable interrupt generation at port */
     HAL_KEY_SW_2_PXIFG = ~(HAL_KEY_SW_2_BIT);  /* Clear any pending interrupt */

 #else
     /* Rising/Falling edge configuratinn */
     PICTL &= ~(HAL_KEY_SW_6_EDGEBIT);    /* Clear the edge bit */
     /* For falling edge, the bit must be set. */
   #if (HAL_KEY_SW_6_EDGE == HAL_KEY_FALLING_EDGE)
     PICTL |= HAL_KEY_SW_6_EDGEBIT;
   #endif


     /* Interrupt configuration:
      * - Enable interrupt generation at the port
      * - Enable CPU interrupt
      * - Clear any pending interrupt
      */
     HAL_KEY_SW_6_ICTL |= HAL_KEY_SW_6_ICTLBIT;
     HAL_KEY_SW_6_IEN |= HAL_KEY_SW_6_IENBIT;
     HAL_KEY_SW_6_PXIFG = ~(HAL_KEY_SW_6_BIT);

     /* Rising/Falling edge configuratinn */
     HAL_KEY_JOY_MOVE_ICTL &= ~(HAL_KEY_JOY_MOVE_EDGEBIT);    /* Clear the edge bit */
     /* For falling edge, the bit must be set. */
   #if (HAL_KEY_JOY_MOVE_EDGE == HAL_KEY_FALLING_EDGE)
     HAL_KEY_JOY_MOVE_ICTL |= HAL_KEY_JOY_MOVE_EDGEBIT;
   #endif


     /* Interrupt configuration:
      * - Enable interrupt generation at the port
      * - Enable CPU interrupt
      * - Clear any pending interrupt
      */
     HAL_KEY_JOY_MOVE_ICTL |= HAL_KEY_JOY_MOVE_ICTLBIT;
     HAL_KEY_JOY_MOVE_IEN |= HAL_KEY_JOY_MOVE_IENBIT;
     HAL_KEY_JOY_MOVE_PXIFG = ~(HAL_KEY_JOY_MOVE_BIT);
 #endif // !CC2540_MINIDK

     /* Do this only after the hal_key is configured - to work with sleep stuff */
     if (HalKeyConfigured == TRUE)
     {
       osal_stop_timerEx(Hal_TaskID, HAL_KEY_EVENT);  /* Cancel polling if active */
     }
   }
   else    /* Interrupts NOT enabled */
   {
 #if defined ( CC2540_MINIDK )
     HAL_KEY_SW_1_ICTL &= ~(HAL_KEY_SW_1_ICTLBIT); /* don't generate interrupt */
     HAL_KEY_SW_2_ICTL &= ~(HAL_KEY_SW_2_ICTLBIT); /* don't generate interrupt */
 #else
     HAL_KEY_SW_6_ICTL &= ~(HAL_KEY_SW_6_ICTLBIT); /* don't generate interrupt */
     HAL_KEY_SW_6_IEN &= ~(HAL_KEY_SW_6_IENBIT);   /* Clear interrupt enable bit */
 #endif  // !CC2540_MINIDK

     osal_set_event(Hal_TaskID, HAL_KEY_EVENT);
   }

   /* Key now is configured */
   HalKeyConfigured = TRUE;
 }

 void OnBoard_KeyCallback ( uint8 keys, uint8 state )  //产生消息
 {
   uint8 shift;
   (void)state;
     #ifdef UART_DEBUG
     print_msg("OnBoard_KeyCallback \r\n" );
     #endif
   if (u8_wechatWriteCharFlag == UNPACK_CONTINUOUS  ||
     ((SwitchBackgroud == EEVO_enterBackground) || (SwitchBackgroud == EEVO_sleep)))
   {
     #ifdef UART_DEBUG
     print_msg("KeyCallback return \r\n" );
     #endif

     return;
   }
   // shift key (S1) is used to generate key interrupt
   // applications should not use S1 when key interrupt is enabled
   shift = (OnboardKeyIntEnable == HAL_KEY_INTERRUPT_ENABLE) ? false : ((keys & HAL_KEY_SW_6) ? true : false);

   if ( OnBoard_SendKeys( keys, shift ) != SUCCESS )
   {
     // Process SW1 here
     if ( keys & HAL_KEY_SW_1 )  // Switch 1
     {
     }
     // Process SW2 here
     if ( keys & HAL_KEY_SW_2 )  // Switch 2
     {
     }
     // Process SW3 here
     if ( keys & HAL_KEY_SW_3 )  // Switch 3
     {
     }
     // Process SW4 here
     if ( keys & HAL_KEY_SW_4 )  // Switch 4
     {
     }
     // Process SW5 here
     if ( keys & HAL_KEY_SW_5 )  // Switch 5
     {
     }
     // Process SW6 here
     if ( keys & HAL_KEY_SW_6 )  // Switch 6
     {
     }
   }

   /* If any key is currently pressed down and interrupt
      is still enabled, disable interrupt and switch to polling */
   if( keys != 0 )
   {
     if( OnboardKeyIntEnable == HAL_KEY_INTERRUPT_ENABLE )
     {
       OnboardKeyIntEnable = HAL_KEY_INTERRUPT_DISABLE;
       HalKeyConfig( OnboardKeyIntEnable, OnBoard_KeyCallback);
     }
   }
   /* If no key is currently pressed down and interrupt
      is disabled, enable interrupt and turn off polling */
   else
   {
     if( OnboardKeyIntEnable == HAL_KEY_INTERRUPT_DISABLE )
     {
       OnboardKeyIntEnable = HAL_KEY_INTERRUPT_ENABLE;
       HalKeyConfig( OnboardKeyIntEnable, OnBoard_KeyCallback);
     }
   }