c - 通过 UART 嵌入式应用程序将 ASCII 字符串转换为 HEX 值

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，我必须将其转换为十六进制，这些转换后的十六进制值将进一步用于某些操作.我需要帮助所以我的问题是有人知道如何做到这一点的逻辑部分吗？我已经做了一些工作..任何 stackoverflow 线程、提示或代码都会受到高度赞赏这是我到目前为止的代码

#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

如果您有 stdio，将 ASCII 输入转换为 HEX 是很简单的。

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

编辑:

在小型微 Controller (attiny、PIC 16F、8051 等)中，您将没有可用的 stdio...在这种情况下，您将需要更多的实践方法，例如以下代码:

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;
}