esp-32s1 reading RTC timer through ULP, getting garbage.

[jshnaidm]

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1. read_RTC_time:
2.     WRITE_RTC_REG(RTC_CNTL_TIME_UPDATE_REG, RTC_CNTL_TIME_UPDATE_S, 1,1)
3. wait_RTC_update:
4.     READ_RTC_REG(RTC_CNTL_TIME_UPDATE_REG, RTC_CNTL_TIME_VALID_S, 1)
5.     jumpr wait_RTC_update, 0, eq
6.     READ_RTC_REG(RTC_CNTL_TIME0_REG+2, 0, 16)
7.     move r1, last_measurement_time
8.     st r0, r1, 0

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The value I'm getting in R0 looks pretty random. On the other hand, if I do:

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1. uint32_t* time0 = (uint32_t *) 0x3FF48010;
2. printf("last_measurement_time: %X, current_time: %X\n", ulp_last_measurement_time & 0xFFFF, (*time0 & 0xFFFF0000) >> 16);

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It seems like I can read the RTC timer fine from the main processor. Current_time makes sense, whereas ulp_last_measurement_time is garbage. What am I doing wrong?

[boarchuz]

READ_RTC_REG(RTC_CNTL_TIME0_REG+2, 0, 16)

This doesn't look right. Are you trying to read the upper 16 bits?: READ_RTC_REG(RTC_CNTL_TIME0_REG, 16, 16)

[jshnaidm]

READ_RTC_REG(RTC_CNTL_TIME0_REG+2, 0, 16)

This doesn't look right. Are you trying to read the upper 16 bits?: READ_RTC_REG(RTC_CNTL_TIME0_REG, 16, 16)

Yeah! I got confused by the macro, I ended up just doing

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1. .set timer_top_16, (0x3FF48014 - DR_REG_RTCCNTL_BASE)/4
2. REG_RD timer_top_16, 0, 16

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And I got it working. Sorry for the trouble, and thank you. I see how what I was doing was wrong now.