c语言 - 使用微控制器"Atmel32"在UART上运行字符串格式命令的代码

Question

我正在编写代码，以便使用终端模拟器从计算机通过UART外围设备运行字符串格式(TurnONLED(的命令，但该代码只打印UART_SendString函数中的标头，而忽略接收部分(命令(。我纠正了代码，但仍然不响应字符串命令，只有数字命令才能工作，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模块初始化并激活

UART>gt；1

UART>gt；2

UART>gt；TurnONLED

UART>gt；关闭

#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] = '';
}

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

Answer 1

• #define TurnONLED 1->CCD_ 2
• #define TurnOFFLED 2->const char TurnOFFLED = '2';
• USART_voidSend(10); //ASCII value 10 for carriage return (print a new line)->
  USART_voidSend('n'); // line feed
• *(string+i)->string[i]
• 您需要将PORTA对应的数据方向寄存器设置为某个位置的输出
• gets_UART1不应该在遇到r时停止，它应该丢弃它并继续阅读。否则，您会在UART rx缓冲区中留下一个n，这将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