Make WriteStringToFile public

Author: mrmorphic

hwio.go

@@ -380,8 +380,7 @@ func WriteUIntToPins(value uint32, pins []Pin) error {
 }
 
 // Write a string to a file and close it again.
-// @todo if we are writing to a /dev file, the driver may emit a message for invalid values. We should return that as an error as well.
-func writeStringToFile(filename string, value string) error {
+func WriteStringToFile(filename string, value string) error {
 	//	fmt.Printf("writing %s to file %s\n", value, filename)
 	f, e := os.OpenFile(filename, os.O_WRONLY|os.O_TRUNC, 0666)
 	if e != nil {

module_bb_pwm.go

@@ -166,7 +166,7 @@ func (module *BBPWMModule) makeOpenPin(pin Pin) (*BBPWMModuleOpenPin, error) {
 	module.openPins[pin] = result
 
 	// ensure polarity is 0, so that the duty time represents the time the signal is high.
-	e = writeStringToFile(result.polarityFile, "0")
+	e = WriteStringToFile(result.polarityFile, "0")
 	if e != nil {
 		return nil, e
 	}
@@ -196,7 +196,7 @@ func (module *BBPWMModule) ensureSlot(item string) error {
 	}
 
 	// enable the item
-	e = writeStringToFile(path, item)
+	e = WriteStringToFile(path, item)
 	// delay a little as it seems to take a bit of time set enable the slot
 	Delay(100)
 	return e
@@ -213,7 +213,7 @@ func (op *BBPWMModuleOpenPin) closePin() error {
 // Set the period in nanoseconds. On BBB, maximum is 1 second (1,000,000,000ns)
 func (op *BBPWMModuleOpenPin) setPeriod(ns int64) error {
 	s := strconv.FormatInt(int64(ns), 10)
-	e := writeStringToFile(op.periodFile, s)
+	e := WriteStringToFile(op.periodFile, s)
 	if e != nil {
 		return e
 	}
@@ -223,7 +223,7 @@ func (op *BBPWMModuleOpenPin) setPeriod(ns int64) error {
 
 func (op *BBPWMModuleOpenPin) setDuty(ns int64) error {
 	s := strconv.FormatInt(int64(ns), 10)
-	e := writeStringToFile(op.dutyFile, s)
+	e := WriteStringToFile(op.dutyFile, s)
 	if e != nil {
 		return e
 	}
@@ -233,8 +233,8 @@ func (op *BBPWMModuleOpenPin) setDuty(ns int64) error {
 
 func (op *BBPWMModuleOpenPin) enabled(e bool) error {
 	if e {
-		return writeStringToFile(op.runFile, "1")
+		return WriteStringToFile(op.runFile, "1")
 	} else {
-		return writeStringToFile(op.runFile, "0")
+		return WriteStringToFile(op.runFile, "0")
 	}
 }

module_dtanalog.go

@@ -67,7 +67,7 @@ func (module *DTAnalogModule) Enable() error {
 		}
 
 		// enable analog
-		e = writeStringToFile(path, "cape-bone-iio")
+		e = WriteStringToFile(path, "cape-bone-iio")
 		if e != nil {
 			return e
 		}

module_dtgpio.go

@@ -161,7 +161,7 @@ func (module *DTGPIOModule) makeOpenGPIOPin(pin Pin) (*DTGPIOModuleOpenPin, erro
 // Needs to be called to allocate the GPIO pin
 func (op *DTGPIOModuleOpenPin) gpioExport() error {
 	s := strconv.FormatInt(int64(op.gpioLogical), 10)
-	e := writeStringToFile("/sys/class/gpio/export", s)
+	e := WriteStringToFile("/sys/class/gpio/export", s)
 	if e != nil {
 		return e
 	}
@@ -174,7 +174,7 @@ func (op *DTGPIOModuleOpenPin) gpioExport() error {
 // Needs to be called to allocate the GPIO pin
 func (op *DTGPIOModuleOpenPin) gpioUnexport() error {
 	s := strconv.FormatInt(int64(op.gpioLogical), 10)
-	e := writeStringToFile("/sys/class/gpio/unexport", s)
+	e := WriteStringToFile("/sys/class/gpio/unexport", s)
 	if e != nil {
 		return e
 	}
@@ -188,7 +188,7 @@ func (op *DTGPIOModuleOpenPin) gpioDirection(dir string) error {
 		return errors.New("direction must be in or out")
 	}
 	f := op.gpioBaseName + "/direction"
-	e := writeStringToFile(f, dir)
+	e := WriteStringToFile(f, dir)
 
 	mode := os.O_WRONLY | os.O_TRUNC
 	if dir == "in" {