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machine: rename CPU_FREQUENCY -> CPUFrequency()

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These all-caps constants aren't in the Go style, so rename it to
CPUFrequency (which is more aligned with Go style). Additionally, make
it a function so that it is possible to add support for changing the
frequency in the future.

Tested by running `make smoketest`. None of the outputs did change.
This commit is contained in:
Ayke van Laethem
2019-12-16 19:59:30 +01:00
committed by Ron Evans
parent 2778377ac9
commit 768c652468
13 changed files with 41 additions and 21 deletions
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src/runtime/runtime_stm32f103xx.go
+1 -1
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@@ -163,7 +163,7 @@ func timerSleep(ticks uint32) {
// The current scaling only supports a range of 200 usec to 6553 msec.
// prescale counter down from 72mhz to 10khz aka 0.1 ms frequency.
stm32.TIM3.PSC.Set(machine.CPU_FREQUENCY/10000 - 1) // 7199
stm32.TIM3.PSC.Set(machine.CPUFrequency()/10000 - 1) // 7199
// Set duty aka duration.
// STM32 dividers use n-1, i.e. n counts from 0 to n-1.