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Question

我对以下代码有疑问。我认为这是一个指针问题，但我不知道如何解决。

我想从 main 调用 SIM7070_Start 函数。此函数调用 SIM7070_SendCommand 然后出现错误。与WiringPi的'serial'变量有关？

请帮忙


#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <wiringPi.h>
#include <wiringSerial.h>

const int pwr = 4;
const int dtr = 25;

int SIM7070_PowerOn()
{
   printf("SIM7070_PowerOn\n");
   pinMode(pwr, OUTPUT);
   digitalWrite(pwr, HIGH);
   delay(2000);
   digitalWrite(pwr, LOW);
   delay(2000);

   pinMode(dtr, OUTPUT);
   digitalWrite(dtr, LOW);
   delay(1000);

}

int SIM7070_powerDown(void)
{
   printf("SIM7070_PowerDown\n");
   digitalWrite(pwr, HIGH);
   delay(1000);
   digitalWrite(pwr, LOW);
   delay(2000);

}

int SIM7070_SendCommand(int serial, char * command, char * expectedResponse)
{
   char data;
   data = (char *) malloc(sizeof(char));

   printf("\nSEND COMMAND IS: %s\n", command);

   serialPrintf(serial, command);
   delay(200);

   while (serialDataAvail(serial)) {
       data = serialGetchar(serial);
       printf("%s", data);
   }

   if (strlen(expectedResponse) != 0) {
       if (strcmp(data, expectedResponse) <= 0) {
           printf("\nSIM7070_SendCommand - The expected response has been found\n");
           return 1;
       } else {
           printf("\nSIM7070_SendCommand - The expected response hasn't been found\n");
           return 0;
       }
   }
}

void SIM7070_Start(int serial)
{
   SIM7070_SendCommand(serial, "AT\r\n", "OK");
}

int main()
{
   int serial;
   char data;

   if (wiringPiSetup() < 0)
       return 1;
   if ((serial = serialOpen("/dev/ttyS0", 57600)) < 0)
       return 1;

   printf("Serial start ...\n");

   SIM7070_PowerOn();
   delay(2000);

   SIM7070_Start(serial);

   delay(5000);
   serialClose(serial);
   SIM7070_powerDown();

   return 0;
}

如果主要是：

int main()
{
   int serial;
   char data;

   if (wiringPiSetup() < 0)
       return 1;
   if ((serial = serialOpen("/dev/ttyS0", 57600)) < 0)
       return 1;

   printf("Serial start ...\n");

   SIM7070_PowerOn();
   delay(2000);

   SIM7070_SendCommand(serial, "AT\r\n", "OK");

   delay(5000);
   serialClose(serial);
   SIM7070_powerDown();

   return 0;
}

有效。

Answer 1

另请参阅我的评论。你可能想要一个像这样的循环：

char data[256], *pData= data;
while(serialDataAvail(serial)){ 
   *pData++ = serialGetchar(serial);     
}
*pData= '[=10=]';
printf ("%s", data);

这使用一个字符数组来放置接收到的数据。指针变量 pData 然后指向此缓冲区并随着每个接收到的字符递增。最后，它用一个终止空字符终止（字符串）缓冲区。

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