MCU-PLUS-SDK-AM263X: API for EPWM_setActionQualifierShadowLoadMode not working?

Daniel Brown

Tool/software:

Does the API EPWM_setActionQualifierShadowLoadMode actually work properly? I am using SDK version 9.01.

I have been having some trouble getting the EPWM AQCTLA register updated concurrently with the CMPA and CMPB registers. So I dug into the API.

When I tried the code in an online compiler, the output I get is 0x0, when it should be 0x10 to indicate shadow load mode. Please check.

uint16_t aqModule = 0;
uint16_t syncModeOffset;
uint16_t shadowModeOffset;
uint16_t my_out;
syncModeOffset = 0x0008U + aqModule;
shadowModeOffset = 0x0004U + aqModule;
my_out = (( 0x0000U & ((~((0x0003U << aqModule) | (0x0003U << syncModeOffset))) | (0x0001U << shadowModeOffset))) | (((0U >> 2U) << syncModeOffset) | ((0U & 0x0003U) << aqModule)));
printf("Result 0x%x",my_out);

over 1 year ago

0 Daniel Brown over 1 year ago

Prodigy 145 points

I haven't checked the older code, but there was a change from 8.06:

0 Akshit Pareek over 1 year ago in reply to Daniel Brown

TI__Expert 4230 points

Hi Daniel,

I am able to reproduce the issue, and am in touch with the SW team to get it fixed.

I will update you as soon as I get some information back!

Best regards,
Akshit

0 Daniel Brown over 1 year ago in reply to Akshit Pareek

Prodigy 145 points

Should be a straightforward fix. I notice that there's a mask variable for LDAQASYNC, but not for SHADOWAQAMODE, even though one is defined in other files.
CSL_EPWM_AQCTL_LDAQASYNC_MASK is referenced.
CSL_EPWM_AQCTL_SHDWAQAMODE_MASK is not.

0 Akshit Pareek over 1 year ago in reply to Daniel Brown

TI__Expert 4230 points

Hi Daniel,

    HW_WR_REG16((base + CSL_EPWM_AQCTL),
        ((HW_RD_REG16(base + CSL_EPWM_AQCTL) &
        (~((CSL_EPWM_AQCTL_LDAQAMODE_MASK << (uint16_t)aqModule) |
        (CSL_EPWM_AQCTL_LDAQASYNC_MAX << (uint16_t)syncModeOffset))) |
        (CSL_EPWM_AQCTL_SHDWAQAMODE_MAX << shadowModeOffset)) |
        ((((uint16_t)loadMode >> 2U) << syncModeOffset) |
        (((uint16_t)loadMode & CSL_EPWM_AQCTL_LDAQAMODE_MASK) <<
        (uint16_t)aqModule))));

The bug seemed to be in parenthesis, I have fixed it, please try this.

As you can see the ShadowMode bit is set, in the AQCTL register.

If this works for you, let me know!

Regards,
Akshit

0 Daniel Brown over 1 year ago in reply to Akshit Pareek

Prodigy 145 points

That works. Can you let me know which future version of SDK will have the fix? I know that 9.0 and 8.6 are both correct.

0 Akshit Pareek over 1 year ago in reply to Daniel Brown

TI__Expert 4230 points

Hi Daniel

MCU PLUS SDK 10.00.00 will have this fix. The release is planned for next month.

Regards,
Akshit

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MCU-PLUS-SDK-AM263X: API for EPWM_setActionQualifierShadowLoadMode not working?