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https://github.com/hybridgroup/gobot.git
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72aade7b3f
Digital write works Add PWMWrite Add AnalogRead Refactor edison adaptor Enable more digital pins Enable all digital pins Add i2c support Properly close i2c device Restore proper examples Add test stub Add Edison README
72 lines
1.2 KiB
Go
72 lines
1.2 KiB
Go
package edison
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import (
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"io/ioutil"
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"strconv"
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)
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func pwmPath() string {
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return "/sys/class/pwm/pwmchip0"
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}
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func pwmExportPath() string {
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return pwmPath() + "/export"
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}
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func pwmUnExportPath() string {
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return pwmPath() + "/unexport"
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}
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func pwmDutyCyclePath(pin string) string {
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return pwmPath() + "/pwm" + pin + "/duty_cycle"
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}
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func pwmPeriodPath(pin string) string {
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return pwmPath() + "/pwm" + pin + "/period"
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}
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func pwmEnablePath(pin string) string {
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return pwmPath() + "/pwm" + pin + "/enable"
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}
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type pwmPin struct {
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pin string
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}
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func newPwmPin(pin int) *pwmPin {
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p := &pwmPin{pin: strconv.Itoa(pin)}
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p.export()
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p.enable("1")
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return p
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}
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func (p *pwmPin) enable(val string) {
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err := writeFile(pwmEnablePath(p.pin), val)
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if err != nil {
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panic(err)
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}
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}
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func (p *pwmPin) period() string {
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buf, err := ioutil.ReadFile(pwmPeriodPath(p.pin))
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if err != nil {
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panic(err)
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}
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return string(buf[0 : len(buf)-1])
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}
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func (p *pwmPin) writeDuty(duty string) {
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err := writeFile(pwmDutyCyclePath(p.pin), duty)
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if err != nil {
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panic(err)
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}
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}
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func (p *pwmPin) export() {
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writeFile(pwmExportPath(), p.pin)
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}
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func (p *pwmPin) unexport() {
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writeFile(pwmUnExportPath(), p.pin)
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}
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func (p *pwmPin) close() {
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p.enable("0")
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p.unexport()
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}
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