go-packages/go-rpio
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Add Pwm mode for pins

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This commit is contained in:
Drahoslav 2017-11-17 02:57:42 +01:00
parent c0dfd7a7e3
commit 4a31f2cfa6
1 changed files with 25 additions and 5 deletions
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30
rpio.go
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@ -91,11 +91,12 @@ func init() {
clkBase = base + clkOffset
}
// Pin mode, a pin can be set in Input or Output mode, or clock
// Pin mode, a pin can be set in Input or Output, Clock or Pwm mode
const (
Input Mode = iota
Output
Clock
Pwm
)
// State of pin, High / Low
@ -135,6 +136,11 @@ func (pin Pin) Clock() {
PinMode(pin, Clock)
}
// Set pin as Pwm
func (pin Pin) Pwm() {
PinMode(pin, Pwm)
}
// Set pin High
func (pin Pin) High() {
WritePin(pin, High)
@ -150,6 +156,7 @@ func (pin Pin) Toggle() {
TogglePin(pin)
}
// Set frequency of Clock pin
func (pin Pin) Freq(freq int) {
SetFreq(pin, freq)
}
@ -189,9 +196,10 @@ func (pin Pin) PullOff() {
PullMode(pin, PullOff)
}
// PinMode sets the mode (direction) of a given pin (Input, Output or Clock)
// PinMode sets the mode (direction) of a given pin (Input, Output, Clock or Pwm)
//
// Clock is possible only for some pins (bcm 4, 5, 6, 20, 21)
// Clock is possible only for pins 4, 5, 6, 20, 21
// Pwm is possible only for pins 12, 13, 18, 19
func PinMode(pin Pin, mode Mode) {
// Pin fsel register, 0 or 1 depending on bank
@ -199,6 +207,9 @@ func PinMode(pin Pin, mode Mode) {
shift := (uint8(pin) % 10) * 3
f := uint32(0)
const alt0 = 4 // 100
const alt5 = 2 // 010
switch mode {
case Input:
f = 0 // 000
@ -207,9 +218,18 @@ func PinMode(pin Pin, mode Mode) {
case Clock:
switch pin {
case 4, 5, 6, 32, 34, 42, 43, 44:
f = 4 // 100 - alt0
f = alt0
case 20, 21:
f = 2 // 010 - alt5
f = alt5
default:
return
}
case Pwm:
switch pin {
case 12, 13, 40, 41, 45:
f = alt0
case 18, 19:
f = alt5
default:
return
}