IWR6843AOP: DSP power management

Hi Juha

Can you please share the register sequence you are following? Also are you performing this on MSS or DSS side?

Regards,

AG

Hi

I'm using the xwr64xxAOP_mmw_demo software. It does not build an image for the DSS so the DSS does not execute anything. In the beginning of main() the SOC is initialized with:

--

/* Populate the SOC configuration: */
socCfg.clockCfg = SOC_SysClock_INIT;
socCfg.dssCfg = SOC_DSSCfg_HALT;
socCfg.mpuCfg = SOC_MPUCfg_CONFIG;

/* Initialize the SOC Module: This is done as soon as the application is started
* to ensure that the MPU is correctly configured. */
socHandle = SOC_init (&socCfg, &errCode);

--

When I run the following (in the MSS side), it will keep printing 1 indicating GEM status is 1 or in other words the DSS is transitioning from OFF to ON.

--

while (1) {
uint32_t powerStatus = CSL_FEXTR(ptrSOCDriverMCB->ptrDSSRegs->GEMPWRSMCFG3, 19U, 18U);
sprintf(buf, "%u\r\n", powerStatus);
UART_writePolling(gMmwMCB.commandUartHandle, (uint8_t*)buf, strlen(buf));
SOC_microDelay(100000);
}

--

If I unhalt the DSP by changing the SOC configuration from SOC_DSSCfg_HALT to SOC_DSSCfg_UNHALT, the power consumption goes down and that loop will print 3 indicating the DSS is ON.

- Juha

Hi Juha

It seems you are only performing DSS Clock gating/halting. Are you performing any of the other steps regarding DSP Power Domain Shutdown as outline in Technical Reference Manual?

Regards,

AG

Hi,

The Technical Reference Manual is not entirely clear how the operation should be done. I've tried the following sequence:

// step 3: Set the DSS_REG.GEMPWRSMCFG4.PWRSMLRSTHALT bit to 0x0
ptrSOCDriverMCB->ptrDSSRegs->GEMPWRSMCFG4 &= ~(1<<17); 
// step 6: Mask all interrupts from DSP by setting the DSS_REG.GEMPWRSMCFG4.GEMEVENTMASK field to
0x1.
ptrSOCDriverMCB->ptrDSSRegs->GEMPWRSMCFG4 |= (1<<18);
// step 7: Trigger a power down by setting the DSS_REG.GEMPWRSMCFG4.PWRSMSLEEPTRIG field to 0x1
ptrSOCDriverMCB->ptrDSSRegs->GEMPWRSMCFG4 |= (1<<16);

After this the PWRSMMODESTATUS goes to 2 (i.e. transitioning from ON to OFF), but the power consumption is not affected.

What is the correct sequence to ensure the DSP is powered off?

- Juha

Hi Juha

I am going to look into providing a full sequence for you that performs shutdown to the DSP Power Domain. Please allow several days for a response.

Regards,

AG

Hi Juha

I am still looking into this

Regards,

AG