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Bc35 NB module at instruction development summary
2022-07-28 11:03:00 【tutu-hu】
List of articles
One .BC35 NB Module introduction
BC35-G It's a high performance 、 Low power consumption NB-IoT modular , Support the six frequency bands listed in the following table . adopt NB-IoT Radio communication protocol （3GPP Rel. 14）,BC35-G The module can establish communication with the infrastructure of the network operator .
Power supply :
VBAT Supply voltage range ：3.1V~4.2V
Typical supply voltage ：3.6V
Transmitting power ：
23dBm±2dB
A serial port ：
Main serial port ： be used for AT Command communication and data transmission , The baud rate supported is 4800bps、9600bps（ Default ）、57600bps、115200bps、230400bps and 460800bps, For firmware upgrade , The baud rate supported is 115200bps and 921600bps
Debug serial port ： For software debugging , Only baud rate is supported 921600bps
Network protocol characteristics ：
Support IPv4/IPv6/UDP/CoAP/LwM2M/Non-IP/DTLS/TCP/MQTT agreement
Antenna interface :
50Ω Characteristic impedance
Two .TCP Data transmission process
1. The module is powered on ----->2. Module networking ----->3. establish TCP Connect ----->4.TCP send data ----->5. Wait for the data to be returned and processed ----->6. The module is powered off .
Detailed procedure flow ：
Related support functions ：
// A serial port 1,printf function
// Ensure that no more than... Data is sent at one time USART1_MAX_SEND_LEN byte
void nb_printf(char* fmt,...)
{
u16 i;
va_list ap;
va_start(ap,fmt);
vsprintf((char*)USART1_TX_BUF,fmt,ap);
va_end(ap);
i=strlen((const char*)USART1_TX_BUF);// The length of the data sent this time
/* Use serial port register operation to send data */
// for(j=0;j<i;j++)// Loop data
// {
// while((USART1->ISR&0X40)==0); // Cycle to send , Until it's sent
// USART1->TDR=USART1_TX_BUF[j];
// }
/* Serial port is adopted HAL Library functions send data */
// HAL_UART_Transmit(&huart1, (uint8_t*)USART1_TX_BUF,i, 1000); // Send received data
// while(__HAL_UART_GET_FLAG(&huart1, UART_FLAG_TC) != SET); // Wait for the end of sending
/* use DMA Send data by */
HAL_USART1_DMA_TX(&USART1TxDMA_Handler,DMA_FLAG_TC2,&huart1,USART1_TX_BUF,i);// Use DMA send data
memset(USART1_TX_BUF,0,sizeof(USART1_TX_BUF));// Empty cache
}
//NB_MODULE After sending the order , Detect the received response
//str: Expected response results
// Return value :0, Did not get the expected response results
// other , Where to expect the response result (str The location of )
u8* nb_send_check_cmd(u8 *str)
{
char *strx=0;
USART1_RX_BUF[USART1_RX_COUNT]=0;// Add Terminator
strx=strstr((const char*)USART1_RX_BUF,(const char*)str);
return (u8*)strx;
}
// towards NB_MODULE Send the specified data
//data: Data sent ( There is no need to add carriage return )
//ack: Expected response results , If it is empty , It means that there is no need to wait for a response
//waittime: Waiting time ( Company :100ms)
// Return value :0, Send successfully ( Got the expected response results )
// 1, fail in send
u8 nb_send_cmd(u8 *data,u8 *ack,u16 waittime)
{
waittime=waittime*100;
nb_printf("%s\r\n",data); // What needs to be sent is the command
if(ack&&waittime) // Need to wait for a response
{
while(--waittime) // Wait for the countdown
{
delay_ms(1);
if(USART1_IDLE_FLAG) // Received the expected response result
{
if(nb_send_check_cmd(ack))
{
//printf("%s ack: %s\r\n",data,(u8*)ack);
Feed_Dog(); // feed a dog
memset(USART1_RX_BUF,0,sizeof(USART1_RX_BUF));// Empty USART1 cache
USART1_IDLE_FLAG=0;
USART1_RX_COUNT=0; // A serial port 1 Accept data reset
return 0; //ack correct , return 1
}
memset(USART1_RX_BUF,0,sizeof(USART1_RX_BUF));// Empty USART1 cache
USART1_IDLE_FLAG=0;
USART1_RX_COUNT=0;// A serial port 1 Accept data reset
}
}
}
return 1; //ack error , return 0
}
// towards NB_MODULE Send the specified data , And read the return parameter value
//data: Data sent ( There is no need to add carriage return )
//ack: Expected response results , If it is empty , It means that there is no need to wait for a response
//waittime: Waiting time ( Company :100ms)
// Return value :0, Send successfully ( Got the expected response results )
// 1, fail in send
u8 nb_send_cmd_return(u8 *data,u8 *ack,u16 waittime,u8 *parameter)
{
nb_printf("%s\r\n",data); // What needs to be sent is the command
if(ack&&waittime) // Need to wait for a response
{
while(--waittime) // Wait for the countdown
{
delay_ms(100);
if(USART1_IDLE_FLAG) // Received the expected response result
{
if(nb_send_check_cmd(ack))
{
*parameter=USART1_RX_BUF[2];
printf("%s ack: %s\r\n",data,(u8*)ack);
Feed_Dog(); // feed a dog
memset(USART1_RX_BUF,0,sizeof(USART1_RX_BUF));// Empty USART1 cache
USART1_IDLE_FLAG=0;
USART1_RX_COUNT=0; // A serial port 1 Accept data reset
return 0; //ack correct , return 1
}
memset(USART1_RX_BUF,0,sizeof(USART1_RX_BUF));// Empty USART1 cache
USART1_IDLE_FLAG=0;
USART1_RX_COUNT=0;// A serial port 1 Accept data reset
}
}
}
return 1; //ack error , return 0
}
2. Module networking
/** * @brief NB Module networking * Reference manual ：p160 Manual network connection * * @param void * * @return 0: Successful connection * 1: The connection fails */
u8 NB_Connect_To_Internet(void)
{
u8 i=0;
for(i=0;i<3;i++)
if(nb_send_cmd((u8 *)"AT+NRB",(u8 *)"REBOOT_CAUSE_APPLICATION_AT",100)==0)break;
if(i==3)
{
printf(" Module restart failed ...\r\n\r\n");
return 1; // Failure , return 1
}
else printf(" Module restart succeeded ...\r\n\r\n");
for(i=0;i<3;i++)
if(nb_send_cmd((u8 *)"AT+NBAND=5",(u8 *)"OK",10)==0)break;
if(i==3)
{
printf(" Failed to set frequency band ...\r\n\r\n");
return 1; // Failure , return 1
}
else printf(" Set frequency band successfully ...\r\n\r\n");
for(i=0;i<3;i++)
if(nb_send_cmd((u8 *)"AT+CFUN=1",(u8 *)"OK",40)==0)break;
if(i==3)
{
printf(" Failed to set the maximum function mode ...\r\n\r\n");
return 1; // Failure , return 1
}
else printf(" Set the maximum function mode successfully ...\r\n\r\n");
i=0;
for(i=0;i<3;i++)
if(nb_send_cmd((u8 *)"AT+CEDRXS=0,5",(u8 *)"OK",10)==0)break;
if(i==3)
{
printf(" Close module eDRX Function failed ...\r\n\r\n");
return 1; // Failure , return 1
}
else printf(" Close module eDRX Function success ...\r\n\r\n");
for(i=0;i<3;i++)
if(nb_send_cmd((u8 *)"AT+CGATT=1",(u8 *)"OK",20)==0)break;
if(i==3)
{
printf(" Failed to attach the network ...\r\n\r\n");
return 1; // Failure , return 1
}
else printf(" Successfully attached to the network ...\r\n\r\n");
for(i=0;i<10;i++)
if(nb_send_cmd((u8 *)"AT+CGATT?",(u8 *)"+CGATT:1",20)==0)break;
if(i==10)
{
printf(" Network connection failed ...\r\n\r\n");
return 1;
}
else
printf(" Network connection successful ...\r\n\r\n");
return 0;
}
3. establish TCP Connect
/** * @brief establish TCP Connect * * @param ip： Need to connect ip Address * port： Port to be connected * socket： After the connection is successful, the created socket value * * @return 0: Send successfully * 1: fail in send */
u8 NB_TCP_Connect(const u8* ip,const u8* port,u8* socket)
{
u8 i=0;
u8 p[50];
for(i=0;i<3;i++)
if(nb_send_cmd_return((u8 *)"AT+NSOCR=STREAM,6,0,1",(u8 *)"OK",100,socket)==0)break;
if(i<3)printf(" establish socket success ...\r\n\r\n");
else
{
printf(" establish socket Failure ...\r\n\r\n");
return 1;
}
*socket=*socket-48;
printf("tcp_socket=%d\r\n",*socket);
sprintf((char*)p,"AT+NSOCO=%d,%s,%s",*socket,ip,port);
for(i=0;i<3;i++)
if(nb_send_cmd((u8 *)p,(u8 *)"OK",100))break;
if(i<3)printf("TCP Successful connection ...\r\n\r\n");
else
{
printf("TCP The connection fails ...\r\n\r\n");
return 1;
}
return 0;
}
4.TCP send data
/** * @brief TCP send data * * @param socket: Socket size * data： Data sent * len： Length of data sent * * @return 0: Send successfully * 1: fail in send */
u8 tx_buffer[2000]={
0}; // Define the final send data buffer
u8 p[2000]; // Encapsulated into the final frame format to be sent
u8 NB_TCP_Send_Data(u8 socket,u8* data,u16 len)
{
u8 i=0;
HexArrayToString(data,(char*)USART1_TX_BUF,len); // First, convert the original data into a string
HexArrayToString(USART1_TX_BUF,(char*)tx_buffer,2*len); // Let's talk about string conversion ASCII code
sprintf((char*)p,"AT+NSOSD=%d,%d,%s,%s,%s",socket,2*len,(char*)tx_buffer,"0x100","101");
memset(USART1_TX_BUF,0,sizeof(USART1_TX_BUF));// Empty cache , Because nb_send_cmd() You also need to use USART1_TX_BUF, So it needs to be emptied
memset(tx_buffer,0,sizeof(tx_buffer)); // Empty cache , Because nb_send_cmd() You also need to use USART1_TX_BUF, So it needs to be emptied
for(i=0;i<3;i++)
if(nb_send_cmd((u8 *)p,(u8 *)"101,1",50)==0)break;
memset(p,0,sizeof(p));// Empty cache
if(i<3)
{
printf("TCP Data sent successfully , And the confirmation is received by the server ...\r\n\r\n");
return 0;
}
else
{
printf("TCP Failed to send data ...\r\n\r\n");
return 1;
}
}
5. Wait for the data to be returned and processed （ Partial procedure ）
while(1) // Wait for the countdown of cloud data
{
delay_ms(5); // Time delay 5ms Determine if data is received
if(USART1_IDLE_FLAG) // A serial port 1 Receiving data is over , And NB Module communication
{
/* Determine whether there is data from the server */
str1=nb_send_check_cmd((u8 *)"+NSONMI:");// Judge whether the received data is +NSONMI:
if(str1) // Make sure you receive +NSONMI:
{
receive_socket=*(str1+8)-48; // Get the current socket Number
if(USART1_RX_COUNT-14==1)receive_num=*(str1+10)-48;
else if(USART1_RX_COUNT-14==2)receive_num=(*(str1+10)-48)*10+*(str1+11)-48; // Get the number of bytes currently received
sprintf((char*)q,"%d,%s,%s,%d",receive_socket,IP_address,portnum,receive_num);// Form a package
receive_data_flag=1; // Received data flag position bit
}
/* Judge whether the data from the server is received */
str2=nb_send_check_cmd((u8*)q); // Judge whether the received data is +NSONMI:
if(str2) // Confirm that the data is received
{
HexStrToByte(str2+strlen(q)+1,Receive_Buffer,2*receive_num); // Put the characters as HEX And exist Receive_Buffer in , To be processed
read_data_flag=1; // Data processing flag position bit
}
memset(USART1_RX_BUF,0,sizeof(USART1_RX_BUF));// Empty cache
USART1_RX_COUNT=0; // Clear the number of bytes accepted
USART1_IDLE_FLAG=0; // Idle interrupt flag reset
}
if(receive_data_flag) // Confirm that the module receives data from the server
{
sprintf((char*)p,"AT+NSORF=%d,%d",receive_socket,200);
nb_printf("%s\r\n",p); // Send and receive data instructions
receive_data_flag=0; // Received data flag bit reset
}
/* Data processing is needed */
if(read_data_flag) // Confirm that data processing is required
{
for(i=0;i<receive_num;i++)
printf("%x ",Receive_Buffer[i]);
printf("\r\n");
waittime=4000; // The timing time is resumed after receiving data once
break;
}
}3、 ... and .UDP Data transmission process
1. The module is powered on ----->2. Module networking ----->3. establish UDP Connect ----->4.UDP send data ----->5. Wait for the data to be returned and processed ----->6. The module is powered off .
Detailed procedure flow ：
Related support functions ：
Same as above TCP Agreement
2. Module networking
Same as above TCP Agreement
3. establish UDP Connect
/** * @brief establish UDP Connect * * @param ip： Need to connect ip Address * port： Port to be connected * socket： After the connection is successful, the created socket value * * @return 0: Send successfully * 1: fail in send */
u8 NB_UDP_Creat_socket(u8* socket)
{
u8 i=0;
for(i=0;i<3;i++)
if(nb_send_cmd_return((u8 *)"AT+NSOCR=DGRAM,17,0,1",(u8 *)"OK",100,socket)==0)break;
if(i<3)
{
printf(" establish socket success ...\r\n\r\n");
*socket=*socket-48;
printf("udp_socket=%d\r\n",*socket);
return 0;
}
else printf(" establish socket Failure ...\r\n\r\n");
return 1;
}
4.UDP send data
/** * @brief UDP send data * * @param socket: Socket size * data： Data sent * len： Length of data sent * * @return 0: Send successfully * 1: fail in send */
u8 NB_UDP_Send_Data(u8 socket,const u8* ip,const u8* port,u8* data,u16 len)
{
u16 i=0;
HexArrayToString(data,(char*)USART1_TX_BUF,len); // First, convert the original data into a string
HexArrayToString(USART1_TX_BUF,(char*)tx_buffer,2*len); // Let's talk about string conversion ASCII code
sprintf((char*)p,"AT+NSOST=%d,%s,%s,%d,%s,%d",socket,ip,port,2*len,(char*)tx_buffer,100);
memset(USART1_TX_BUF,0,sizeof(USART1_TX_BUF));// Empty cache , Because nb_send_cmd() You also need to use USART1_TX_BUF, So it needs to be emptied
memset(tx_buffer,0,sizeof(tx_buffer)); // Empty cache , Because nb_send_cmd() You also need to use USART1_TX_BUF, So it needs to be emptied
for(i=0;i<3;i++)
if(nb_send_cmd((u8 *)p,(u8 *)"100,1",100)==0)break;
memset(p,0,sizeof(p));// Empty cache
if(i<3)
{
printf("UDP Data sent successfully ...\r\n\r\n");
return 0;
}
else
{
printf("UDP Failed to send data ...\r\n\r\n");
return 1;
}
}
5. Wait for the data to be returned and processed
Same as above TCP Agreement 边栏推荐
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