Diff: main.cpp

Revision:

0:444ff736d35e

Child:

1:6fb6fabd8592

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Thu May 26 19:50:24 2011 +0000
@@ -0,0 +1,68 @@
+//*****************************************************************************
+//* SERIAL PORT RECEIVE ATTACH DEMO PROGRAM
+//* Simple demo program showing how the serial port "attach()" method is used
+//* to interrupt when a character has been received into the USART. 
+//*
+//* The main() program sets up the serial port baudrate, attaches the
+//* function pointer to the function to be called when a character is received
+//* on this serial port, and then loops and flashed some LEDs.
+//* 
+//* Routine "void SerialRecvInterrupt(void)" is invoked anytime a character 
+//* has been received by the by the USART. 
+//*
+//*****************************************************************************
+#include "mbed.h"
+#include <ctype.h>
+
+#define BFR_SIZE         32         // Needs to be a power of two.
+#define BFR_WRAP_MASK  0x1F         // Modulo 32
+
+unsigned char rcvBuffer[BFR_SIZE];  // Receive buffer. 
+unsigned char inIdx;                // Read by background, written by Int Handler.
+unsigned char outIdx;               // Read by Int Handler, written by Background.
+
+DigitalOut myled(LED1);
+Serial pc (USBTX,USBRX);
+
+//*****************************************************************************
+// mc serial receive interrupt handler
+//***************************************************************************** 
+
+void SerialRecvInterrupt (void)
+{
+    unsigned char c;
+     
+    c = pc.getc();                // On receive interrupt, get the character.
+    
+    while (!pc.writeable()){};    // Wait until xmit buffer is empty.
+    pc.putc(c);                   // Echo char back out the serial port.
+     
+    while (!pc.writeable()){};    // Make sure transmit buffer is empty.
+    pc.putc(toupper(c));          // Echo the uppercase value of input char.
+}
+
+//*****************************************************************************
+// Main Program
+//*****************************************************************************
+
+int main() {
+    int i;
+    
+    for (i=0; i<BFR_SIZE; i++) {  // Clear buffer if you have OCD. 
+        rcvBuffer[i] = 0; 
+    }
+
+    inIdx  = 0;                   // Initialize bfr input and output pointers. 
+    outIdx = 0;  
+    
+    pc.baud(38400);                                // USART to PC USB USART.
+    pc.attach (&SerialRecvInterrupt, pc.RxIrq);    // Recv interrupt handler
+    pc.printf ("Serial interrupt demo\n");          
+
+    while(1) {
+        myled = 1;
+        wait(0.2);
+        myled = 0;
+        wait(0.2);
+    }
+}