用USART2发送AT指令到GSM调制解调器[嵌入式C]

问题描述：

我试图从终端发送AT命令思想USART1，然后使用USART2到GSM调制解调器[终端 - > USART1 - > USART2 - >调制解调器]。在发送AT命令后，调制解调器不会向我发送任何回应。它会是什么问题？ USART1正在完美工作。我使用STM32 Nucleo和Keil uVision4。用USART2发送AT指令到GSM调制解调器[嵌入式C]

发送功能

void send_usart2(char *msg){ 
send_usart1("USART2 sending..."); send_usart1("\r\n"); 
while (*msg){ 
    while(USART_GetFlagStatus(USART2, USART_FLAG_TXE) == RESET); 
    USART_SendData(USART2, *msg++); 
    } 
    send_usart1("USART2 sending successful"); send_usart1("\r\n"); 
}

USART2处理器

void USART2_IRQHandler(void){ 
int index = 0; 
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET){ 
    USART_ClearITPendingBit(USART2, USART_IT_RXNE); 
    Received_values[index++] = USART_ReceiveData(USART2); 
    } 
}

中断初始化

void InitInterrupt2(void) { 
NVIC_InitTypeDef NVIC_InitStruct2;        
NVIC_InitStruct2.NVIC_IRQChannel = USART2_IRQn; 
NVIC_InitStruct2.NVIC_IRQChannelPreemptionPriority = 0; 
NVIC_InitStruct2.NVIC_IRQChannelSubPriority = 0;   
NVIC_InitStruct2.NVIC_IRQChannelCmd = ENABLE; 
NVIC_Init(&NVIC_InitStruct2); 
}

UART初始化

void InitUART2(void) {  
GPIO_InitTypeDef GPIO_InitStructure; 
USART_InitTypeDef USART_InitStructure; 
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); 
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); 

USART_InitStructure.USART_BaudRate = 115200; 
USART_InitStructure.USART_WordLength = USART_WordLength_8b ; 
USART_InitStructure.USART_StopBits = USART_StopBits_1; 
USART_InitStructure.USART_Parity = USART_Parity_No; 
USART_InitStructure.USART_HardwareFlowControl = 
USART_HardwareFlowControl_None; 
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; 

USART_Init(USART2,&USART_InitStructure);   /* Configure USAR1 */      
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); 
USART_Cmd(USART2,ENABLE);      /* Enable the USART1 */            

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; 
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; 
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; 
GPIO_Init(GPIOA, &GPIO_InitStructure); 

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; 
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3; 
//GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz; 
GPIO_Init(GPIOA, &GPIO_InitStructure); 
}

这看起来像我发送它。

..... 
    send_usart2(Command_buffer);     
    send_usart1("Command: "); 
    send_usart1(Command_buffer); 
    send_usart1("\r\n");  
    memset(Command_buffer, NULL, sizeof(Command_buffer)); 
    os_dly_wait(500); 
    send_usart1("Received values: "); 
    send_usart1(Received_values); 
    send_usart1("\r\n"); 
    memset(Received_values, NULL, sizeof(Received_values)); 
    .......

在调制解调器的传出命令缓冲区中是否没有'“\ r \ n”'？ – unwind

我试着添加一行send_usart2（“\ r \ n”）;在send_usart2（Command_buffer）之后;行，但没有任何反应。 –

是什么让你认为这是一个软件问题？您是否已验证数据出现在UART线路上，一直到GSM模块？你用示波器测量了波特率吗？ – Lundin

答

所有我需要配置该线形式：

USART_HardwareFlowControl = USART_HardwareFlowControl_None;

到：

USART_HardwareFlowControl = USART_HardwareFlowControl_RTS;

这意味着USART2和调制解调器需要 “握手” 连接类型。

用USART2发送AT指令到GSM调制解调器[嵌入式C]

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