Question

我正在开发一些嵌入式项目[PIC MCU]，我将通过UART接收数据。数据将包含一些ascii值，我必须转换为HEX，那些转换后的HEX值将进一步用于某些操作我需要帮助所以我的问题是，任何人都有逻辑部分如何做到这一点？我已经做了一些工作..任何stackoverflow线程，提示或CODE将是高度appreaciated 这是我的代码，直到现在

#include "mcc_generated_files/mcc.h"
#define _XTAL_FREQ 16000000
#define FRAMESIZE 18

void main(void)
{
   uint8_t data ,i,j;
   uint8_t value;
   uint8_t RX_Buffer [] ,RGB_data[] ,HEX_data[]   ;

    // initialize the device
    SYSTEM_Initialize();
    INTERRUPT_GlobalInterruptEnable();          // Enable the Global Interrupts
    INTERRUPT_PeripheralInterruptEnable();      // Enable the Peripheral Interrupts


    do
    {
        data = EUSART_Read();             // Read received character
        for (i = 0; i<FRAMESIZE ; i++)
        {
          RX_Buffer[i] = data;
        }

        EUSART_Write(data);               // Echo back the data received
        }while(!RCIF);        //check if any data is received

        // my UART data command starts with R and ends with '\n'
        if(RX_Buffer[0]=='R' && RX_Buffer[FRAMESIZE-1] == '\n')
        {
             LATAbits.LATA2   = 1;          //check flag
            __delay_ms(2000);
             LATAbits.LATA2   = 0;

            for (j = 0 ; j = 5; j++ )               // get the RGB value in separate array
            {
                RGB_data[j] = RX_Buffer[j+3];
                HEX_data[value] = RGB_data[j]/16 ;
              // so I am somewhat stuck how can I collect the UART data {for eg "RGBFF00A0AA" is my command which will be in ascii
               if (HEX_data[value] <=9)
                {
                   HEX_data[value] += '0';                    
                }
                else 
                {
                    HEX_data[value]=HEX_data[value]-10+'A';
                }

            }

        }

}

Answer 1

如果你有stdio，将ASCII输入转换为HEX很简单。

void AsciiToHex(char * src, char * dest)
{
  while(*src)
  {
    sprintf(dest + strlen(dest), " %02X", *src);
    src++;
  }
}

修改

在小型微控制器（attiny，PIC 16F，8051等）中，您将无法使用stdio ......在这种情况下，您需要更多的实际操作方法，如下面的代码：

void AsciiToHex(char * src, char * dest) { char hex[] = "0123456789ABCDEF"; while(*src) { char low, high; high = *src >> 4; // high nibble low = *src & 0x0f; // low nibble *dest = hex[high]; dest++; *dest = hex[low]; dest++; *dest = ' '; dest++; src++; } *dest = 0; }

通过UART嵌入式应用程序转换ASCII字符串到HEX值

1 个答案: