I/O: Add helpful text for I2C errors

gohai · gohai · commit 53859221f404 · 2015-10-12T17:10:15.000+02:00
diff --git a/java/libraries/io/src/processing/io/I2C.java b/java/libraries/io/src/processing/io/I2C.java
@@ -120,6 +120,9 @@ public void endTransmission() {
     transmitting = false;
     out = null;
     if (ret < 0) {
+      if (ret == -5) {    // EIO
+        System.err.println("The device did not respond. Check the cabling and whether you are using the correct address.");
+      }
       throw new RuntimeException(NativeInterface.getError(ret));
     }
   }
@@ -170,6 +173,9 @@ public byte[] read(int len) {
     transmitting = false;
     out = null;
     if (ret < 0) {
+      if (ret == -5) {    // EIO
+        System.err.println("The device did not respond. Check the cabling and whether you are using the correct address.");
+      }
       throw new RuntimeException(NativeInterface.getError(ret));
     }
 

Original file line number	Diff line number	Diff line change
`@@ -120,6 +120,9 @@ public void endTransmission() {`
`120`	`120`	`transmitting = false;`
`121`	`121`	`out = null;`
`122`	`122`	`if (ret < 0) {`
	`123`	`+ if (ret == -5) { // EIO`
	`124`	`+ System.err.println("The device did not respond. Check the cabling and whether you are using the correct address.");`
	`125`	`+ }`
`123`	`126`	`throw new RuntimeException(NativeInterface.getError(ret));`
`124`	`127`	`}`
`125`	`128`	`}`
`@@ -170,6 +173,9 @@ public byte[] read(int len) {`
`170`	`173`	`transmitting = false;`
`171`	`174`	`out = null;`
`172`	`175`	`if (ret < 0) {`
	`176`	`+ if (ret == -5) { // EIO`
	`177`	`+ System.err.println("The device did not respond. Check the cabling and whether you are using the correct address.");`
	`178`	`+ }`
`173`	`179`	`throw new RuntimeException(NativeInterface.getError(ret));`
`174`	`180`	`}`
`175`	`181`