From aac66be40a9d1cb7b35b1ec809fb35ef1391be94 Mon Sep 17 00:00:00 2001
From: Marian Craciunescu <m.craciunescu@tarent.de>
Date: Thu, 18 Jan 2018 23:45:59 +0200
Subject: [PATCH] add doc to exported functions.Exposed also the spi driver.

---
 gpio.go | 1 +
 i2c.go  | 3 ++-
 spi.go  | 7 +++++++
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/gpio.go b/gpio.go
index de83fb0..e124cce 100644
--- a/gpio.go
+++ b/gpio.go
@@ -152,6 +152,7 @@ var gpioDriverInitialized bool
 var gpioDriverInstance GPIODriver
 
 // SetGpioDriver should be used only for testing purpose.It makes possible to unit test embd gpio functionality
+// it overrides the gpioDriverInstance
 func SetGpioDriver(drv GPIODriver, initialized bool) {
 	gpioDriverInstance = drv
 	gpioDriverInitialized = initialized
diff --git a/i2c.go b/i2c.go
index d09fcbf..9f39296 100644
--- a/i2c.go
+++ b/i2c.go
@@ -43,7 +43,8 @@ type I2CDriver interface {
 var i2cDriverInitialized bool
 var i2cDriverInstance I2CDriver
 
-// SetI2cDriver should be used only for testing purpose.It makes possible to unit test embd i2c functionality
+// SetI2cDriver should be used only for testing purpose.It makes possible to unit test embd i2c functionality.
+// it overrides the i2cDriverInstance
 func SetI2cDriver(drv I2CDriver, initialized bool) {
 	i2cDriverInstance = drv
 	i2cDriverInitialized = initialized
diff --git a/spi.go b/spi.go
index db5b029..365b3b1 100644
--- a/spi.go
+++ b/spi.go
@@ -56,6 +56,13 @@ type SPIDriver interface {
 var spiDriverInitialized bool
 var spiDriverInstance SPIDriver
 
+// SetSPIDriver should be used only for testing purpose.It makes possible to unit test embd spi functionality.
+// it overrides spiDriverInstance
+func SetSPIDriver(drv SPIDriver, initialized bool) {
+	spiDriverInstance = drv
+	spiDriverInitialized = initialized
+}
+
 // InitSPI initializes the SPI driver.
 func InitSPI() error {
 	if spiDriverInitialized {