working serialUSB with timeout

as a temporary workaround for the fact that SerialUSB is often blocking,
this crude implementation makes the low-level C usbSendBytes function
non-blocking (with a return code of bytes sent) and implements a 2ms
timeout in the wirish write() function.

also adds begin(), end(), getDTR(), getRTS(), pending(). device is still
initialized the old fashioned way during init() so that, eg, autoreset
will work. includes a simple multi-test program.

1 files changed, 135 insertions, 0 deletions

diff --git a/examples/test-serialusb.cpp b/examples/test-serialusb.cpp
new file mode 100644
index 0000000..9d0a862
--- /dev/null
+++ b/examples/test-serialusb.cpp
@@ -0,0 +1,135 @@
+// Sample main.cpp file. Blinks an LED, sends a message out USART2
+// and turns on PWM on pin 2
+
+#include "wirish.h"
+#include "usb.h"
+
+#define LED_PIN 13
+#define BUT_PIN 38
+
+uint32 state = 0;
+#define QUICKPRINT  0
+#define BIGSTUFF    1
+#define NUMBERS     2
+#define SIMPLE      3
+#define ONOFF       4
+
+
+void setup()
+{
+    /* Set up the LED to blink  */
+    pinMode(LED_PIN, OUTPUT);
+
+    /* Set up the Button */
+    pinMode(BUT_PIN, INPUT_PULLUP);
+
+    Serial2.begin(9600);
+    Serial2.println("Hello world! This is the debug channel.");
+}
+
+int toggle = 0;
+
+uint8 c1 = '-';
+
+void loop() {
+    toggle ^= 1;
+    digitalWrite(LED_PIN, toggle);
+    delay(1000);
+
+    if(digitalRead(BUT_PIN)) {
+        while(digitalRead(BUT_PIN)) {};
+        state++;
+    }
+    
+    switch(state) {
+        case QUICKPRINT:
+            for(int i = 0; i<30; i++) {
+                usbSendBytes(&c1,1);
+                SerialUSB.print('.');
+                SerialUSB.print('|');
+            }
+            Serial2.println(SerialUSB.pending(),DEC);
+            SerialUSB.println();
+            break;
+        case BIGSTUFF:
+            SerialUSB.println("01234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890");
+            SerialUSB.println((uint32)123456789,DEC);
+            SerialUSB.println(3.1415926535);
+            Serial2.println(SerialUSB.pending(),DEC);
+            break;
+        case NUMBERS:
+            SerialUSB.println("Numbers! -----------------------------");
+            Serial2.println("Numbers! -----------------------------");
+            SerialUSB.println('1');
+            Serial2.println('1');
+            SerialUSB.println(1,DEC);
+            Serial2.println(1,DEC);
+            SerialUSB.println(-1,DEC);
+            Serial2.println(-1,DEC);
+            SerialUSB.println(3.14159265);
+            Serial2.println(3.14159265);
+            SerialUSB.println(3.14159265,9);
+            Serial2.println(3.14159265,9);
+            SerialUSB.println(123456789,DEC);
+            Serial2.println(123456789,DEC);
+            SerialUSB.println(-123456789,DEC);
+            Serial2.println(-123456789,DEC);
+            SerialUSB.println(65535,HEX);
+            Serial2.println(65535,HEX);
+            break;
+        case SIMPLE:
+            Serial2.println("Trying write('a')");
+            SerialUSB.write('a');
+            Serial2.println("Trying write(\"b\")");
+            SerialUSB.write("b");
+            Serial2.println("Trying print('c')");
+            SerialUSB.print('c');
+            Serial2.println("Trying print(\"d\")");
+            SerialUSB.print("d");
+            Serial2.println("Trying print(\"efg\")");
+            SerialUSB.print("efg");
+            Serial2.println("Trying println(\"hij\\n\\r\")");
+            SerialUSB.print("hij\n\r");
+            SerialUSB.write(' ');
+            SerialUSB.println();
+            Serial2.println("Trying println(123456789,DEC)");
+            SerialUSB.println(123456789);
+            Serial2.println("Trying println(3.141592)");
+            SerialUSB.println(3.141592);
+            Serial2.println("Trying println(\"DONE\")");
+            SerialUSB.println("DONE");
+            break;
+        case ONOFF:
+            Serial2.println("Shutting down...");
+            SerialUSB.println("Shutting down...");
+            SerialUSB.end();
+            Serial2.println("Waiting 4seconds...");
+            delay(4000);
+            Serial2.println("Starting up...");
+            SerialUSB.begin();
+            SerialUSB.println("Hello World!");
+            Serial2.println("Waiting 4seconds...");
+            delay(4000);
+            state++;
+            break;
+        default:
+            state = 0;
+    }
+}
+
+// Force init to be called *first*, i.e. before static object allocation.
+// Otherwise, statically allocated object that need libmaple may fail.
+ __attribute__(( constructor )) void premain() {
+    init();
+}
+
+int main(void)
+{
+    setup();
+
+    while (1) {
+        loop();
+    }
+    return 0;
+}
+