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machine: refactor PWM support

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This commit refactors PWM support in the machine package to be more
flexible. The new API can be used to produce tones at a specific
frequency and control servos in a portable way, by abstracting over
counter widths and prescalers.
This commit is contained in:
Ayke van Laethem
2020-05-19 22:30:46 +02:00
committed by Ron Evans
parent f880950c3e
commit 72acda22b0
20 changed files with 1565 additions and 758 deletions
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src/machine/machine_nrf52.go
+3 -3
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@@ -63,7 +63,7 @@ func (i2c *I2C) setPins(scl, sda Pin) {
// PWM
var (
pwmChannelPins = [3]uint32{0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF}
pwms = [3]*nrf.PWM_Type{nrf.PWM0, nrf.PWM1, nrf.PWM2}
pwmChannelSequence [3]uint16
PWM0 = &PWM{PWM: nrf.PWM0}
PWM1 = &PWM{PWM: nrf.PWM1}
PWM2 = &PWM{PWM: nrf.PWM2}
)