Diff: main.cpp

Revision:

0:90e9a34552d3

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Sat Feb 20 11:26:16 2010 +0000
@@ -0,0 +1,50 @@
+#include "mbed.h"
+
+// Test app to cause program to suddently terminate when using serial interrupt...
+// Line 24 seems to be the important bit, but I don't really understand why?
+// Is it perhaps the putc is peroperly clearing the interrupt flag instead of the getc?
+
+
+// usb serial device defaults to 9600 baud, 8N1 on /dev/ttyACM0 (in Linux!)
+Serial pc(USBTX, USBRX); // tx, rx
+
+// debugging LEDs
+DigitalOut interrupt(LED1);
+DigitalOut tx(LED4);
+
+// one byte receive buffer
+char rx_byte;
+
+void handle()
+{
+  interrupt = 1;
+  //if(pc.readable()) // <--- this line doesn't matter either way...
+  {
+    rx_byte = pc.getc();
+    //pc.putc(rx_byte);  // <--- WITHOUT THIS LINE, THE APPLICATION WILL HANG IF IT RECEIVES WHILE SENDING!
+  }
+  interrupt = 0;
+  return;
+}
+
+int main()
+{
+  interrupt = 0;
+  tx = 0;
+  pc.attach(handle);
+  
+  while(1) 
+  {
+    // send a long string of bytes 
+    tx = 1;
+    for(int i=0;i<20;i++)
+    {
+      NVIC_DisableIRQ(UART0_IRQn);
+      pc.printf("If I receive while transmitting this I *won't* crash...\r\n");
+      NVIC_EnableIRQ(UART0_IRQn);
+    }
+    tx = 0;
+    
+    wait(1.0);
+  }
+}
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