使用微控制器“Atmel32”通过 UART 以字符串格式运行命令的代码

Question

我正在编写代码，以使用终端仿真器从计算机上的 UART 外设运行字符串格式 (TurnONLED) 命令，但代码仅打印 UART_SendString 函数中的标头，并忽略接收部分（命令）。我纠正了代码，但仍然不响应字符串命令，只有数字命令才有效，所以问题是如何使条件语句使用字符串而不是数字值。输出已附加在此处输入图像描述 UART 模块已初始化并处于活动状态

UART>>1

UART>>2

UART>>TurnONLED

UART>>TurnOFFLED

#include "DIO_interface.h" 
#include "PORT_interface.h" 
#include "USART_interface.h" 
const char TurnONLED = '1';
const char TurnOFFLED = '2';

void PORT_voidInit(void); 
void USART_voidInit(void);  //baud rate: 9600  frame size to 8 bits  1 stop bit  no parity

unsigned char USART_Receive(void)        //function receives a character in Ascii
void gets_UART1(unsigned char *string);  //function concatenates characters to get a string (command) 

void main (void) 
{ 
    unsigned char Str[72]; 
    PORT_voidInit();  //Rx input (PD0) and Tx output (PD1)
    USART_voidInit();

    UART_Send_String("UART Module Initialized and Active");
    USART_voidSend('\r');          //carriage return
    UART_Send_String("UART>>");   //command console
    while(1)
    {
        gets_UART1(Str);              //get command as a string
        UART_Send_String("UART>>");   //command console 
        USART_voidSend('\n');         //line feed
        if(*Str==TurnONLED)         //data in ASCI as PC sends ASCI data
        {
            DIO_u8SetPinValue (PORTA, PIN0, PIN_HIGH);    //LED ON;
        }
        else if(*Str==TurnOFFLED)
        {
            DIO_u8SetPinValue (PORTA, PIN0, PIN_LOW);     //LED OFF;
        }
    }
}


void gets_UART1(unsigned char *string)  //Receive a character until carriage return or newline
{
     unsigned char i=0,J=0;
     do
     {
         string[i] = USART_u8Receive();
         J = string[i];
         i++;
     }
     while(J!='\r');
     string[i] = '\0';
}


unsigned char USART_Receive(void) 
{
    while(GET_BIT(UCSRA,UCSRA_RXC)==0); 
    return UDR;        //USART I/O Data Register 
}

Answer 1

• #define TurnONLED 1 -> const char TurnONLED = '1';。
• #define TurnOFFLED 2 -> const char TurnOFFLED = '2';。
• USART_voidSend(10); //ASCII 值 10 表示回车（打印新行） ->
  USART_voidSend('\n'); // 换行
• *(string+i) -> string[i]
• 需要将PORTA对应的数据方向寄存器设置为输出到某处。
• gets_UART1 不应在遇到 \r 时停止，它应该丢弃它并继续读取。否则，您会在 UART rx 缓冲区中留下 \n，这会扰乱连续读取或导致溢出错误。
• gets_UART1 中的最后一个 i++; 不正确，应删除。