TMS320F28379D: Help setting up DMA transfer from EPWM6 TBCTR

Part Number: TMS320F28379D

Tool/software:

I am trying to use DMA to capture EPWM6 TBCTR as a timestamp.

DMA trigger is ADCA INT1

I see one capture initially, but it stops capturing further.

If instead of EPWM6 TBCTR as source, I use another variable in RAM, I see that the value *is* updated as expected.

Key parameters are below.  Do you see any issue or have suggestions about what the issue may be?

In the linker, timestamp_data   : > RAMGS5  to locate variables in DMA-accessible RAM

#pragma DATA_SECTION(timestamp, "timestamp_data");
uint16_t timestamp;

const void* TimeStamp_ptr = (void *)&timestamp;
const void* epwm6_TBCTR = (void *)(EPWM6_BASE + EPWM_O_TBCTR);

SysCtl_selectSecMaster(SYSCTL_SEC_CONTROLLER_DMA,SYSCTL_SEC_CONTROLLER_CLA);

DMA_initController();
DMA_setEmulationMode(DMA_EMULATION_FREE_RUN);

DMA_configAddresses(DMA_CH2_BASE, TimeStamp_ptr, epwm6_TBCTR);
DMA_configBurst(DMA_CH2_BASE, 1U, 0, 0);
DMA_configTransfer(DMA_CH2_BASE, 1U, 0, 0);
DMA_configWrap(DMA_CH2_BASE, 65535U, 0, 65535U, 0);
DMA_configMode(DMA_CH2_BASE, DMA_TRIGGER_ADCA1, DMA_CFG_ONESHOT_DISABLE | DMA_CFG_CONTINUOUS_ENABLE | DMA_CFG_SIZE_16BIT);
DMA_enableTrigger(DMA_CH2_BASE);

DMA_startChannel(DMA_CH2_BASE);

As I said, if I use a variable instead of TBCTR, it works as expected, triggering on ADCA1:

#pragma DATA_SECTION(test_timestamp_src, "timestamp_data");
uint16_t test_timestamp_src;
const void* test_timestamp_ptr = (void *)&test_timestamp_src;

DMA_configAddresses(DMA_CH2_BASE, TimeStamp_ptr, test_timestamp_ptr);

Thanks!