duh exporting

matrix.go

@@ -60,7 +60,7 @@ var DefaultConfig = HardwareConfig{
 }
 
 type RunTimeConfig struct {
-	gpio_slowdown int
+	Gpio_slowdown int
 }
 
 // HardwareConfig rgb-led-matrix configuration
@@ -110,7 +110,7 @@ func (c *HardwareConfig) geometry() (width, height int) {
 
 func (c *RunTimeConfig) rt_options() *C.struct_RGBLedRuntimeOptions {
 	rt := &C.struct_RGBLedRuntimeOptions{}
-	rt.gpio_slowdown = C.int(c.gpio_slowdown)
+	rt.gpio_slowdown = C.int(c.Gpio_slowdown)
 
 	return rt
 }