Example_Blocking.cpp

00001 /// @file Example_Blocking.cpp
00002 /// @brief Test blocking write / read
00003 /// 
00004 /// - Uses SerialDriver with USBTX and USBRX.
00005 /// - Has much too small buffers, to how far can it get?
00006 /// 
00007 /// - Testing how much bytes were transmitted, with too small TX buffer and forced non blocking
00008 /// - Waiting till 10 bytes are received
00009 /// - LED4 indicates parallel thread working
00010 /// 
00011 
00012 #if 0
00013 
00014 #include "SerialDriver.h"
00015 
00016 SerialDriver pc(USBTX, USBRX, 4, 32);
00017 
00018 // This thread is running in parallel
00019 DigitalOut led4(LED4);
00020 void parallel(void const * argument)
00021 {
00022     while(1)
00023     {
00024         Thread::wait(20);
00025         led4= !led4;
00026     }
00027 }
00028 
00029 int main()
00030 {
00031     // Start the other thread
00032     Thread parallelTask(&parallel);
00033     
00034     
00035     const char * completeText= "This is a complete text. How much will you receive?";
00036     const int completeTextLength= strlen(completeText);
00037     int writtenBytes;
00038     
00039     
00040     const int readBufferLength= 10;
00041     unsigned char readBuffer[readBufferLength];
00042     int receivedBytes= 0;
00043     
00044     while(1)
00045     {
00046         // write non blocking, how much get transmitted?
00047         writtenBytes= pc.write((const unsigned char*)completeText, completeTextLength, false);
00048         
00049         // now print the result
00050         pc.printf("\r\nOnly %i of %i bytes were transmitted using non blocking write.\r\n", writtenBytes, completeTextLength);
00051         
00052         
00053         // wait for 10 bytes
00054         pc.printf("I wait for my 10 bytes. Send them!\r\n", writtenBytes, completeTextLength);
00055         receivedBytes+= pc.read(readBuffer, readBufferLength);
00056         
00057         // now print result
00058         pc.printf("Received %i bytes since start.\r\n\r\n", receivedBytes);
00059         
00060         
00061         // wait a bit
00062         Thread::wait(1000);
00063     }
00064 }
00065 
00066 #endif