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我是使用霸道者 STM32F103ZET6 , 火哥的 wifi 透傳 demo code 修改, esp8266 當 STA , PC 當 server , PC送 data 給 ESP8266 接收, 但在 main() 調用 ESP8266_ReceiveString() ,無法正常接收資料 , 但在 ESP8266_ReceiveString() , 可以看到正常收到的 data , 不知道有哪位大神 可以幫忙解答一下 , 真的跪求 ,感恩不盡 > . < ! char *test; test = ESP8266_ReceiveString(0); macPC_Usart ( "test=%s\n", test ); |
main()
ESP8266_ReceiveString()
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那個是由 server 發 data 給 esp8266 wifi module, 再給 STM32 uart , 根據模式 ,放進 strEsp8266_Fram_Record .Data_RX_BUF , 然後再指定 給 pRecStr (pRecStr = strEsp8266_Fram_Record .Data_RX_BUF;)
應該沒有錯
第一张图 pRecStr = strEsp8266_Fram_Record .Data_RX_BUF是 if 判断为真才会执行，之所以第一张图能显示串口信息是走了else分支。
楼主自己看看第一张图里的代码
{
char* pRecStr = 0;
if(真)
{
//程序根本没走到这
pRecStr = strEsp8266_Fram_Record .Data_RX_BUF;
}
else
{
//程序走的这里
print("..."); //所以这里调用print能打印
}
return pRecStr; //由于if为假，pRecStr没有赋值还是NULL；
}
你试试把上面的"return pRecStr;"改成"return strEsp8266_Fram_Record .Data_RX_BUF;"，main函数里肯定能打印
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樓友抱歉
/*
* 函数名：ESP8266_ReceiveString
* 描述 ：WF-ESP8266模块接收字符串
* 输入 ：enumEnUnvarnishTx，声明是否已使能了透传模式
* 返回 : 接收到的字符串首地址
* 调用 ：被外部调用
*/
char * ESP8266_ReceiveString ( FunctionalState enumEnUnvarnishTx )
{
char * pRecStr = 0;
strEsp8266_Fram_Record .InfBit .FramLength = 0;
strEsp8266_Fram_Record .InfBit .FramFinishFlag = 0;
while ( ! strEsp8266_Fram_Record .InfBit .FramFinishFlag );
strEsp8266_Fram_Record .Data_RX_BUF [ strEsp8266_Fram_Record .InfBit .FramLength ] = '\0';
if ( enumEnUnvarnishTx )
pRecStr = strEsp8266_Fram_Record .Data_RX_BUF;
else
{
if ( strstr ( strEsp8266_Fram_Record .Data_RX_BUF, "+IPD" ) )
pRecStr = strEsp8266_Fram_Record .Data_RX_BUF;
}
return pRecStr;
}
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有的, 我在函式裡 , 是可以打印出正確的 data
那应该问题不大。仔细检查打印是否执行，打印的buf是否有数据
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if ( strstr ( strEsp8266_Fram_Record .Data_RX_BUF, "+IPD" ) )
还是判断啊，判断逻辑假，依然不会赋值。建议楼主编译选项设置成none，然后下断点看看pRecStr赋值有没有走到吧。
函式裡有打印出來正確值 , 到main() 裡 打印出來是亂碼
是假的話 , 不是透傳模式 , 走 TCP/IP protcol , 封包裡會有標檔頭 " +IPD " , 我在這裡有打印出來正確的 data
你把关键地方的函数代码贴出来，你的截图，看不清楚
/*
* 函数名：ESP8266_ReceiveString
* 描述 ：WF-ESP8266模块接收字符串
* 输入 ：enumEnUnvarnishTx，声明是否已使能了透传模式
* 返回 : 接收到的字符串首地址
* 调用 ：被外部调用
*/
char * ESP8266_ReceiveString ( FunctionalState enumEnUnvarnishTx )
{
char * pRecStr = 0;
int c;
strEsp8266_Fram_Record .InfBit .FramLength = 0;
strEsp8266_Fram_Record .InfBit .FramFinishFlag = 0;
while ( ! strEsp8266_Fram_Record .InfBit .FramFinishFlag );
strEsp8266_Fram_Record .Data_RX_BUF [ strEsp8266_Fram_Record .InfBit .FramLength ] = '\0';
if ( enumEnUnvarnishTx )
pRecStr = strEsp8266_Fram_Record .Data_RX_BUF;
else
{
if ( strstr ( strEsp8266_Fram_Record .Data_RX_BUF, "+IPD" ) )
pRecStr = strEsp8266_Fram_Record .Data_RX_BUF;
//b = strncpy(a,strEsp8266_Fram_Record .Data_RX_BUF,c);
c = strlen(strEsp8266_Fram_Record .Data_RX_BUF);
macPC_Usart ( "c1=%d\n",c);
strncpy(a,strEsp8266_Fram_Record .Data_RX_BUF,c);
macPC_Usart ( "c2=%d\n",c);
//macPC_Usart ( "b=%s\n", b );
//pRecStr = &a[0];
macPC_Usart ( "3=%s\n",strEsp8266_Fram_Record .Data_RX_BUF );
macPC_Usart ( "4=%s\n", a );
}
return pRecStr;
}
//////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
volatile uint8_t ucTcpClosedFlag = 0;
char cStr [ 1500 ] = { 0 };
char *test;
/**
* @brief ESP8266 （Sta Tcp Client）透传
* @param 无
* @retval 无
*/
void ESP8266_StaTcpClient_UnvarnishTest ( void )
{
uint8_t ucStatus;
char cStr [ 100 ] = { 0 };
printf ( "\r\n正在配置 ESP8266 ......\r\n" );
macESP8266_CH_ENABLE();
ESP8266_AT_Test ();
ESP8266_Net_Mode_Choose ( STA );
while ( ! ESP8266_JoinAP ( macUser_ESP8266_ApSsid, macUser_ESP8266_ApPwd ) );
ESP8266_Enable_MultipleId ( DISABLE );
while ( ! ESP8266_Link_Server ( enumTCP, macUser_ESP8266_TcpServer_IP, macUser_ESP8266_TcpServer_Port, Single_ID_0 ) );
//while ( ! ESP8266_UnvarnishSend () );
printf ( "\r\n配置 ESP8266 完毕\r\n" );
sprintf ( cStr,
"ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n" );
//ESP8266_SendString ( ENABLE, cStr, 0, Single_ID_0 ); //发送数据
ESP8266_SendString ( DISABLE, cStr, 104, Single_ID_0 ); //发送数据
Delay_ms ( 100 );
// ESP8266_ExitUnvarnishSend();
while ( 1 )
{
/*
sprintf ( cStr,
"ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n\
ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n\
ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n\
ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n\
ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n\
ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n\
ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n\
ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n\
ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n\
ABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\nABCDEFGHIJKLMNOPQRSTUVWXYZ\r\n" );
ESP8266_SendString ( ENABLE, cStr, 0, Single_ID_0 ); //发送数据
Delay_ms ( 100 );
*/
//ESP8266_ExitUnvarnishSend();
test = ESP8266_ReceiveString(1);
macPC_Usart ( "test=%s\n", test );
if ( ucTcpClosedFlag ) //检测是否失去连接
{
ESP8266_ExitUnvarnishSend (); //退出透传模式
do ucStatus = ESP8266_Get_LinkStatus (); //获取连接状态
while ( ! ucStatus );
if ( ucStatus == 4 ) //确认失去连接后重连
{
printf ( "\r\n正在重连热点和服务器 ......\r\n" );
while ( ! ESP8266_JoinAP ( macUser_ESP8266_ApSsid, macUser_ESP8266_ApPwd ) );
while ( ! ESP8266_Link_Server ( enumTCP, macUser_ESP8266_TcpServer_IP, macUser_ESP8266_TcpServer_Port, Single_ID_0 ) );
printf ( "\r\n重连热点和服务器成功\r\n" );
}
while ( ! ESP8266_UnvarnishSend () );
}
}
}
你在函数里面打印的是strEsp8266_Fram_Record .Data_RX_BUF，pRecStr 是经过判断才赋值的，前面的兄弟也说过，建议将判断语句（ if ( strstr ( strEsp8266_Fram_Record .Data_RX_BUF, "+IPD" ) )）去掉，或者
return (char *) strEsp8266_Fram_Record .Data_RX_BUF.然后在看看数据是啥样的