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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_generic.go
-18
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@@ -84,24 +84,6 @@ func (adc ADC) Get() uint16 {
//export __tinygo_adc_read
func adcRead(pin Pin) uint16
// InitPWM enables support for PWM peripherals.
func InitPWM() {
// Nothing to do here.
}
// Configure configures a PWM pin for output.
func (pwm PWM) Configure() error {
return nil
}
// Set turns on the duty cycle for a PWM pin using the provided value.
func (pwm PWM) Set(value uint16) {
pwmSet(pwm.Pin, value)
}
//export __tinygo_pwm_set
func pwmSet(pin Pin, value uint16)
// I2C is a generic implementation of the Inter-IC communication protocol.
type I2C struct {
Bus uint8