why is the CPU 320MHz - Githubissues

kjarvel / hifive1revb_wifi

SiFive HiFive1 Rev B ESP32 - WiFi connection demo

https://github.com/kjarvel/hifive1revb_wifi/wiki/HiFive1-Rev-B-WiFi-and-BLE

The Unlicense

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why is the CPU 320MHz #3

Closed luott7421 closed 4 years ago

luott7421 commented 4 years ago

In len 44 of cpu,c

kjarvel commented 4 years ago

Hi luott7421,

That is a very short and interesting question. In the cpu_clock_init function in cpu.c, the clock speed is set to 320 Mhz.

Why? Only to show an example on how to do it. It is not required for the WiFi demo.
How? I hope the comments on line 41-45 explains it all. https://github.com/kjarvel/hifive1revb_wifi/blob/v1.4/cpu.c#L41 The clocks are configured according to Chapter 6.1 Clock Generation Overview in the Freedom E310-G002 Manual: https://www.sifive.com/boards/hifive1-rev-b