STEPCONFIG registers of ADC subsystem of SITARA AM335X

Praveen Kajjam

Intellectual 365 points

Other Parts Discussed in Thread: SEGGER

Hi,

STEPCONFIG registers of ADC subsystem not able to understand the significance of below config settings:

SEL_RFM pins SW configuration.
00 = VSSA.
01 = XNUR.
10 = YNLR.
11 = VREFN.

SEL_RFP pins SW configuration.
000 = VDDA.
001 = XPUL.
010 = YPLL.
011 = VREFP.
1xx = INTREF.

11 WPNSW_SWC R/W 0h WPNSW pin SW configuration
10 YPNSW_SWC R/W 0h YPNSW pin SW configuration
9 XNPSW_SWC R/W 0h XNPSW pin SW configuration
8 YNNSW_SWC R/W 0h YNNSW pin SW configuration
7 YPPSW_SWC R/W 0h YPPSW pin SW configuration
6 XNNSW_SWC R/W 0h XNNSW pin SW configuration

5 XPPSW_SWC R/W 0h XPPSW pin SW configuration

I am not able to understand the significance of configuring these setting. Even not able to find any additional info in TRM. Can someone help me to understand the significance of each of these settings?

over 10 years ago

0 Biser Gatchev-XID over 10 years ago

TI__Guru**** 393215 points

Hi,

These are related to the touchscreen controller. You can look at the TSC driver examples in Starterware to see how this works. This wiki also has some information: http://processors.wiki.ti.com/index.php/StarterWare_Touchscreen The Linux EZSDK also has a TSC driver.

0 Praveen Kajjam over 10 years ago in reply to Biser Gatchev-XID

Intellectual 365 points

Hi Biser,

Thanks for the quick clarifications. We are not using any touchscreen interface with this design. We are using it as a standalone ADC to monitor some supply voltages. In this scenario what to do with those STEPCONFIG registers? Is these any default configuration for them for ADC only configuration?

Thanks & Regards,

Praveen Kajjam

0 Biser Gatchev-XID over 10 years ago in reply to Praveen Kajjam

TI__Guru**** 393215 points

What software are you using?

0 Praveen Kajjam over 10 years ago in reply to Biser Gatchev-XID

Intellectual 365 points

SEGGER embOS.

IAR Compiler

0 Biser Gatchev-XID over 10 years ago in reply to Praveen Kajjam

TI__Guru**** 393215 points

Don't they have an ADC driver in their AM335X BSP? I'm afraid we don't support 3-rd party software.

0 Biser Gatchev-XID over 10 years ago in reply to Biser Gatchev-XID

TI__Guru**** 393215 points

However for general-purpose ADC you shouldn't need to set these bits.

0 Praveen Kajjam over 10 years ago in reply to Biser Gatchev-XID

Intellectual 365 points

Thanks for your support Biser.

0 xixiguohx over 10 years ago in reply to Biser Gatchev-XID

Intellectual 720 points

Hi Biser

I tried to write a ADC driver, but I couldn't write the stepconfig register. Before I write the stepconfig register, I have disabled the StepConfig_WriteProtect.

Could you give me some suggestion?

0 Biser Gatchev-XID over 10 years ago in reply to xixiguohx

TI__Guru**** 393215 points

Sorry, I'm not a software expert so I can't help on this. I suggest you look at the Starterware ADC examples to see how this is done.

0 xixiguohx over 10 years ago in reply to Biser Gatchev-XID

Intellectual 720 points

I will have a try, thank you for your quickly reply.

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STEPCONFIG registers of ADC subsystem of SITARA AM335X