i.MX ProcessorsのトピックRe: GPT Timer

GPT Timer

john71 — Sun, 11 Nov 2018 11:09:35 GMT

I work with IMX6DQ. I want GPT timer to tick every 1ms in the Free-Run mode.

So as I see in clock source

8–6
CLKSRC

Clock Source select.
000 No clock
001 Peripheral Clock (ipg_clk)
010 High Frequency Reference Clock (ipg_clk_highfreq)
011 External Clock
100 Low Frequency Reference Clock (ipg_clk_32k)
101 Crystal oscillator divided by 8 as Reference Clock (ipg_clk_24M)
111 Crystal oscillator as Reference Clock (ipg_clk_24M)
others Reserved

As I understand only Peripheral Clock is available for me. I see that Peripheral Clock = 528000000. So in order to get 1ms tick I need a divider 528000.

But with all available prescalers

PRESCALER

Prescaler bits.
0x000 Divide by 1
0x001 Divide by 2
... ...
0xFFF Divide by 4096

I can not get such a divider.

What should I do?

Re: GPT Timer

igorpadykov — Sun, 11 Nov 2018 23:01:35 GMT

Hi Evgeny

other clock sources also are available, also ipg_clk < 528000000
and max. frequencies are given in Table 18-4. System Clock
Frequency Values i.MX6DQ Reference Manual
https://www.nxp.com/docs/en/reference-manual/IMX6DQRM.pdf

One can check gpt example in bare metals sdk (zip available on SMP Enable in IMX6 )

Best regards
igor
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Re: GPT Timer

john71 — Mon, 12 Nov 2018 08:44:19 GMT

Thank you.

I didn't find bare metals examples for iMX6.

Re: GPT Timer

igorpadykov — Mon, 12 Nov 2018 10:05:00 GMT

https://community.nxp.com/servlet/JiveServlet/download/824324-1-391797/1.1.0_iMX6_Platform_SDK.zip

Re: GPT Timer

john71 — Mon, 12 Nov 2018 10:47:55 GMT

Thank you very much. One more question - in what environment I can load the SDK?