R2DF_MASK
*val = (data->config & R2DF_MASK) ? -128000 : 0;
*val = (data->config & R2DF_MASK) ? 127875 : 255875;
data->config |= R2DF_MASK;
data->config &= ~R2DF_MASK;
data->config |= R2DF_MASK;
data->config &= ~R2DF_MASK;