58. Decode ADC Result Using Union Bitfields

Many embedded microcontrollers store ADC results in a packed format where a 12-bit ADC value and channel number are stored together in a 16-bit register.

You are given a 16-bit ADC register where:

• Bits 0–11 represent the ADC result (0–4095)
• Bits 12–15 represent the ADC channel (0–15)

Your task is to:

1. Define a union that overlays:
   • A raw 16-bit uint16_t adc_reg
   • A struct with:
     • adc_value (12 bits)
     • channel (4 bits)
2. Read adc_reg from input
3. Extract and print:
   • Channel number
   • ADC result (0–4095)
      

Example-1

Input: 0xC3F5
Output:
Channel: 12  
ADC Value: 1013

Example-2

Input: 0x10FF
Output:
Channel: 1  
ADC Value: 255