錯誤＃29期望一個表達式

Question

以下是二維數組的代碼將引發錯誤＃29預期為表達式。

typedef  enum 
{
    BATTERY_POW = 0,
    USB_POW = 1,
    END_STATE = 2
} BMTState_e;   

typedef enum //event enums
{  
    NO_EVENT = 0,
    BOOT_EVENT =1,
    //I/O events
    POW_GOOD_LOW =2,
    POW_GOOD_HIGH = 3,
    VBUS_POW_LOW = 4,
    VBUS_POW_HIGH =5
}BMTEvent_e;

該結構定義為

typedef struct  //state machine definition
{
    void (*funcPtr)();
    BMTState_e nextState;
}BMTAction_t;
BMTState_e BMTGlobal_State ; //global state

該函數定義為

void BMTTest()
{
 //do nothing for time being
}
BMTAction_t  action[END_STATE][END_EVENT]={
   [BATTERY_POW][NO_EVENT]    = {BMTTest,BATTERY_POW}
   [BATTERY_POW][BOOT_EVENT]    = {BMTTest,BATTERY_POW},
   [BATTERY_POW][POW_GOOD_LOW]  = {BMTTest,USB_POW},
   [BATTERY_POW][POW_GOOD_HIGH] = {BMTTest,BATTERY_POW}
   [BATTERY_POW][VBUS_POW_LOW]  = {BMTTest,BATTERY_POW},
   [BATTERY_POW][VBUS_POW_HIGH] = {BMTTest,USB_POW},
   [USB_POW][BOOT_EVENT]    = {BMTTest,USB_POW_}
   [USB_POW][BOOT_EVENT]    = {BMTTest,USB_POW},
   [USB_POW][POW_GOOD_LOW]  = {BMTTest,USB_POW},
   [USB_POW][POW_GOOD_HIGH] = {BMTTest,BATTERY_POW}
   [USB_POW][VBUS_POW_LOW]  = {BMTTest,BATTERY_POW},
   [USB_POW][VBUS_POW_HIGH] = {BMTTest,USB_POW}
}; 

void BMT_HandleEvent(BMTEvent_e event)
{
  BMTAction_t stAction;


   if(event != NO_EVENT)
   {
      stAction.funcPtr = action[BMTGlobal_State][event].funcPtr;
      stAction.nextState = action[BMTGlobal_State][event].nextState;
      printf("current State =%d, event = %d, nextState = %d",BMTGlobal_State, event,stAction.nextState );

      if(NULL!= stAction.funcPtr)
        stAction.funcPtr();
        BMTGlobal_State = stAction.nextState;
    }

}

int main()
{
BMTEvent_e = BOOT_EVENT;
if(retVal)
    {
    BMTGlobal_State = BATTERY_POW;
    }
else // PG is low so check VBUS signal 
    {
retVal = GPIO_Read_Pin(USB_VBUS_PWR_PIN);
if(retVal)
        {
        BMTGlobal_State = USB_POW;
        }
else
        {
        BMTGlobal_State = CRADLE_POW;
        }
    }
event = BOOT_EVENT;
while (1)
    {
    BMT_HandleEvent(event);
    } 
}

這個想法是基於接收到的事件執行狀態機。 2D數組列出了當前狀態以及該狀態的所有可能事件，一旦接收到事件，就會調用一個函數指針，並且該狀態將轉換到下一個狀態。

我正在將MicroC / OS2與GreenHills編譯器/工具一起使用。 非常感謝您的回復。

我遵循了基思的建議

BMTAction_t  action[END_STATE][END_EVENT] = {
                  {{NULL,BATTERY_POW}}, //0
                  {{BMTProcess_BatteryPowBoot,BATTERY_POW}},//   1
                  {{BMTProcess_PowGoodLow,BATTERY_POW}},//2
                  {{BMTProcess_PowGoodHigh,BATTERY_POW}}, //3
                  {{BMTProcess_VBUSPowerLow,BATTERY_POW}}, //4
                  {{BMTProcess_VBUSPowerHigh,BATTERY_POW}},//5 
};

編譯器出現錯誤

"{{BMTProcess_PowGoodHigh,BATTERY_POW}}, //3" 
"error # 146 too many initializer values"

Answer 1

這不是指定的初始化程序的正確語法。 您一次只能指定一個索引。

我錯了 多個指示符是允許的。 實際上，在添加一些聲明之后，使用gcc -std=c99 -pedantic -Wall -Wextra編譯您的代碼。

typedef enum { BATTERY_POW, END_STATE } BMTState_e;
typedef enum { BOOT_EVENT, POW_GOOD_LOW, POW_GOOD_HIGH, END_EVENT } BMTEvent_e;

void BMTTest(void);

typedef struct  //state machine definition
{
    void (*funcPtr)();
    BMTState_e nextState;
}BMTAction_t;

BMTAction_t  action[END_STATE][END_EVENT]={
    [BATTERY_POW][BOOT_EVENT]    = {BMTTest,BATTERY_POW},
    [BATTERY_POW][POW_GOOD_LOW]  = {BMTTest,BATTERY_POW},
    [BATTERY_POW][POW_GOOD_HIGH] = {BMTTest,BATTERY_POW}
}; 

您的編譯器很可能不理解指定的初始化程序。 （它們是1999年標准添加到該語言中的，即使到今天，也不是所有的編譯器都支持它們。）

如果不是，則需要刪除括號中的表達式（並確保元素順序正確）。 大概是這樣的：

BMTAction_t  action0[END_STATE][END_EVENT] = {
    {{ BMTTest, BATTERY_POW }},
    {{ BMTTest, BATTERY_POW }},
    {{ BMTTest, BATTERY_POW }}
};

Answer 2

基思的答案幫助我弄清楚了正確的初始化。 我必須列出{{}}中給定狀態的所有可能的事件和關聯的函數指針。

這就像初始化row [0] [0]和row [0] [1]的元素一樣，我必須列出頂級雙花括號內的所有元素，例如

 { **{{**values/function/events associated with row [0][0],{values/function/events associated with row [0][1] }}, 
//now do the same for row 1. 
**{{**values/function/events associated with row [1][0],{values/function/events associated with row [1][1] **}}** }; //end of the array

BMTAction_t  action[END_STATE][END_EVENT] = {
                 //STATE = BATTERY_POW
                  {{NULL,BATTERY_POW}, //0
                  {BMTProcess_BatteryPowBoot,BATTERY_POW},//   1
                  {BMTProcess_PowGoodLow,BATTERY_POW},//2
                  {BMTProcess_PowGoodHigh,BATTERY_POW}, //3
                  {BMTProcess_VBUSPowerLow,BATTERY_POW}, //4
                  {BMTProcess_VBUSPowerHigh,BATTERY_POW}},//5 
                  //STATE = USB_POW
                  {{NULL,USB_POW}, //0
                  {BMTProcess_BatteryPowBoot,USB_POW},//   1
                  {BMTProcess_PowGoodLow,USB_POW},//2
                  {BMTProcess_PowGoodHigh,USB_POW}, //3
                  {BMTProcess_VBUSPowerLow,USB_POW}, //4
                  {BMTProcess_VBUSPowerHigh,USB_POW}}//5 
                };

Answer 3

如果使用-c99選項，則您正在使用的初始化將與greenhills編譯器一起使用。

我必須對您的代碼進行一些小的更改才能進行編譯：

• 添加END_EVENT枚舉
• 在action聲明的各項之間添加一些逗號。
• 固定錯別字USB_POW_至USB_POW

這是修改后的代碼：

#include <stdio.h>
typedef enum {
    BATTERY_POW = 0,
    USB_POW = 1,
    END_STATE = 2
} BMTState_e;

typedef enum {
    NO_EVENT = 0,
    BOOT_EVENT =1,
    //I/O events
    POW_GOOD_LOW =2,
    POW_GOOD_HIGH = 3,
    VBUS_POW_LOW = 4,
    VBUS_POW_HIGH =5,
    END_EVENT = 6

} BMTEvent_e;

typedef struct {
    void (*funcPtr)();
    BMTState_e nextState;
} BMTAction_t;

void BMTTest()
{
 //do nothing for time being
}
BMTAction_t  action[END_STATE][END_EVENT]={
[BATTERY_POW][NO_EVENT]    = {BMTTest,BATTERY_POW},
[BATTERY_POW][BOOT_EVENT]    = {BMTTest,BATTERY_POW},
[BATTERY_POW][POW_GOOD_LOW]  = {BMTTest,USB_POW},
[BATTERY_POW][POW_GOOD_HIGH] = {BMTTest,BATTERY_POW},
[BATTERY_POW][VBUS_POW_LOW]  = {BMTTest,BATTERY_POW},
[BATTERY_POW][VBUS_POW_HIGH] = {BMTTest,USB_POW},
[USB_POW][BOOT_EVENT]    = {BMTTest,USB_POW},
[USB_POW][BOOT_EVENT]    = {BMTTest,USB_POW},
[USB_POW][POW_GOOD_LOW]  = {BMTTest,USB_POW},
[USB_POW][POW_GOOD_HIGH] = {BMTTest,BATTERY_POW},
[USB_POW][VBUS_POW_LOW]  = {BMTTest,BATTERY_POW},
[USB_POW][VBUS_POW_HIGH] = {BMTTest,USB_POW}
};
int main()
{
    return 1;
}

這是不帶-c99的編譯器輸出：

$ ccppc test.c
"test.c", line 30: error #29: expected an expression
  [BATTERY_POW][NO_EVENT]    = {BMTTest,BATTERY_POW},
  ^

"test.c", line 31: error #29: expected an expression
  [BATTERY_POW][BOOT_EVENT]    = {BMTTest,BATTERY_POW},
  ^

"test.c", line 32: error #29: expected an expression
  [BATTERY_POW][POW_GOOD_LOW]  = {BMTTest,USB_POW},
  ^

"test.c", line 33: error #29: expected an expression
  [BATTERY_POW][POW_GOOD_HIGH] = {BMTTest,BATTERY_POW},
  ^

"test.c", line 34: error #29: expected an expression
  [BATTERY_POW][VBUS_POW_LOW]  = {BMTTest,BATTERY_POW},
  ^

"test.c", line 35: error #29: expected an expression
  [BATTERY_POW][VBUS_POW_HIGH] = {BMTTest,USB_POW},
  ^

"test.c", line 36: error #29: expected an expression
   [USB_POW][BOOT_EVENT]    = {BMTTest,USB_POW},
   ^

"test.c", line 37: error #29: expected an expression
  [USB_POW][BOOT_EVENT]    = {BMTTest,USB_POW},
  ^

"test.c", line 38: error #29: expected an expression
  [USB_POW][POW_GOOD_LOW]  = {BMTTest,USB_POW},
  ^

"test.c", line 39: error #29: expected an expression
  [USB_POW][POW_GOOD_HIGH] = {BMTTest,BATTERY_POW},
  ^

"test.c", line 40: error #29: expected an expression
  [USB_POW][VBUS_POW_LOW]  = {BMTTest,BATTERY_POW},
  ^

"test.c", line 41: error #29: expected an expression
  [USB_POW][VBUS_POW_HIGH] = {BMTTest,USB_POW}
  ^

和-c99 ：

$ ccppc -c99 test.c

Answer 4

您確實意識到您的代碼包括以下內容：

   [USB_POW][BOOT_EVENT]    = {BMTTest,USB_POW_}
   [USB_POW][BOOT_EVENT]    = {BMTTest,USB_POW},

甚至我也會對此感到困惑。 您是說第一個成為NO_EVENT嗎？