I2S_CGFR_I2SSTD_SET
cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_I2S);
cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_LEFT_J);
cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_RIGHT_J);
cgfr = I2S_CGFR_I2SSTD_SET(I2S_STD_DSP);