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Original question:

AM3358: Timer4 IRQ in capture mode

AM3358: Timer TCRR read issue

user6316547
Prodigy 130 points

Part Number: AM3358

Hi Ti,

The TCRR reg is a negative number when I use “readl_relaxed” to read the reg , but I read it in user space by mmap that is correct?

Could you help me to resolve it?

Thanks.

BRs

Jiawei

  • 0
    TI__Guru 70632 points

    user6316547 said:
    The TCRR reg is a negative number when I use “readl_relaxed” to read the reg

    The timer counter register is a 32-bit unsigned value, and readl() should return the same. How are you reading a negative number?

    user6316547 said:
    but I read it in user space by mmap that is correct?

    Yes mmap via /dev/ mem is one way to get to that value.

    Regards, Andreas