safeload write for Mid Eq

Question

Hello there, 
 I'm testing the mid EQ filter in Sigmastudio, and got one question when safeloading the 5 coefficients into the ADAU1701, 
 once i changed the boost value and updated, the 5 coefficients were safeloaded two times, shown as below, 5 coefficients below the red line was the same as the datas above the line. 
 
 I didn't understand why these coefficients were safeloaded twice. Could anynone give some or explanation or clarification? 
 Thanks 
 Best regards, 
 Eason

DaveThib · Accepted Answer

Hello Eason, 
 I was busy yesterday and was not able to look at this further. This is why including the project in a post helps us to save time. Harish was able to work on this and found that this is a bug. He also found that it is not just with the ADAU1701 but it is for pretty much all the processors that have an EQ with a slider in the GUI. 
 This is a bug with SigmaStudio GUI and not with the actual DSP code produced. It should only be sending it once when you right click and enter a new value. You will see many writes when you grab the control and move it but even then it is sending each change twice! Your microcontroller code does NOT have to send it twice. Once is all that is needed. Your original instinct that something is wrong was correct and there should only be one write. 
 Thanks for bringing this to our attention. 
 Dave T)

wangea · Answer

Hello Dave, 
 Just to confirm send it once is enough for updating the coefficients. 
 Thanks for your help. 
 Eason

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safeload write for Mid Eq