PSoC™ 5, 3 & 1 Forum Discussions

[Anonymous]

Hello,

I'm trying to configure a filter with 16 bits data from an ADC DelSig. I have configured the coherency to MID in the ADC and the filter and the "dalign" is enabled in the filter. I think that I have configured the DMA properly. Howver when I see the data filtered, it have some noise. Originally I was reading a sensor wih the ADC but later I have try with a potenciometer with the same result.The noise appear when the voltage cross VDD/2. What could be the problem? Thank you

[odissey1]

Check ADC and DMA alignment and coherency settings to this

PSoC 5LP – 16 Bit and 24 Bit Digital Filter Code Examples - Hackster.io

Secondary, avoid channel B of the Filter as it seems to have a bug in the implementation

Filter Channel B 16 bit DMA issue

[Anonymous]

In my project I had configured the ADC and the Filter as the follow:

ADC

• Coherency: MID (ADC_SetCoherency(ADC1_COHER_MID)

Fiter

• Coherency: MID (Filter_SetCoherency(Filter_CHANNEL_A, Filter_KEY_MID))
• Dalign: Enabled (Filter_SetCoherency(Filter_CHANNEL_A, Filter_KEY_MID))

DMA

• ADC sample pointer: ADC_DelSig_DEC_SAMP_PTR
• Filter Stage ponter: Filter_STAGEA_PTR

This configuration is found in the components Datasheets.

The sugested project has the follow confingurarion:

ADC

• Coherency: LOW

Fiter

• Coherency: MID (Filter_SetCoherency(Filter_CHANNEL_A, Filter_KEY_MID))
• Dalign: Filter_DALIGN_REG =  Filter_DALIGN_REG | FILTER_DATA_ALIGN;  with FILTER_DATA_ALIGN = 0x05

DMA

• ADC sample pointer: ADC_DelSig_DEC_SAMP_16B_PTR
• Filter Stage ponter: Filter_STAGEA_PTR

However i have tried with the las confiuration and I have the same result. The problem could be the imput range with the 16bits resolution?

Thank you.