I changed happex ADC's gain for bpm and raster, the gain right now is: left: adc_intgain[10]={1,0,1,0,0}; adc_conv[10]={8,2,8,15,1} right: adc_intgain[10]={1,0,1,0,0,0} adc_conv[10]={8,2,8,15,15,15} The gain might not affect bpm calibration