Hi,
There are two GPADC supported on AWRL1432, GPADC1 and GPADC2.
With the gpadc example rlexample_gpadcmeas.c, I can get the mean value of GPADC with z_fecssGpadcRes.c_GpadcMeasVa. But I tested on AWRL1432BOOST and found the value of z_fecssGpadcRes.c_GpadcMeasVa[0] is for GPADC2 and the value of z_fecssGpadcRes.c_GpadcMeasVa[1] is for GPADC1. Is this expected? The number of GPADC confused me.
Thanks,
Chris
Hi Chris,
From what I see in our example, it looks like index 0 corresponds to GPADC pin1 and index 1 corresponds to GPADC pin2. Can you explain how you determineds index 0 corresponds to GPADC2?
Regards,
Tim
Tim,
z_fecssGpadcRes.c_GpadcMeasVa[0] =127. That means it detected the voltage is (127/256)*1.8V =~0.89V
z_fecssGpadcRes.c_GpadcMeasVa[1] =170. That means it detected the voltage is (170/256)*1.8V =~1.195V
From the sch, you can find GPADC1 is connected to 1.2V power supply. GPADC2 is connected to a voltage divider circuit of 1.8V power supply and the voltage GPADC2 should be detected is half of 1.8V. That is about 0.9V.
So I think index 0 corresponds to GPADC2 and index 1 corresponds to GPADC1. Would you pls double check?
Thanks,
Chris
