Simple C problem? Am I blind?

[pic.programmer]

Try something like this.

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Code C - [expand]
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void MP3_Set_Volume(char left, char right) {
  unsigned int volume;
 
  volume = (left<<8) + right;             // calculate value  
}
 
MP3_Set_Volume(127 - level, 127 - level);

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Are you using VS1053B Chip ?