PWM_FROM_REG
#define PWM_FROM_REG(val) (val)
#define PWM_FROM_REG(val) ((val) << 4)
#define PWM_FROM_REG(val) (val)
#define PWM_FROM_REG(val, inv) ((inv) ? 255 - (val) : (val))
#define PWM_FROM_REG(reg) (((reg) & 0x7E) << 1)