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Ultra96 Hardware Design Cpu speed and Fan control

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Cpu speed and Fan control

andycap over 6 years ago

Hi Guys,

I have just got an ultra96.

I thought the main cores were 1.5ghz but they seem to be set to 1.2ghz in cpu_info_max_frequency. Is there a reson for this?

Also there doesn't seem to be any fan control, the fan spinning flat out is driving me mad.

Even loading the 4 cores up 100% each my max temp is only 52 so I'm thinking this fan is running a bit fast.

Is there any way to enable fan control?

Many thanks for any help

Andy

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0 bhfletcher over 6 years ago

The Ultra96 has a -1 speed grade device, which has a max APU frequency of 1.2 GHz. See DS925, Table 28.
The fan can be controlled via GPIO F4. However, we have not implemented an example for this yet. The idea is to read the temperature and adjust the pulse width on F4. Perhaps someone in the community has already done this and will share.
Bryan
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0 bhfletcher over 6 years ago

The Ultra96 has a -1 speed grade device, which has a max APU frequency of 1.2 GHz. See DS925, Table 28.
The fan can be controlled via GPIO F4. However, we have not implemented an example for this yet. The idea is to read the temperature and adjust the pulse width on F4. Perhaps someone in the community has already done this and will share.
Bryan
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