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Buffered Serial Port Driver for RTOS

Dependents:   nucleo_cannonball PiballNeoController

Buffered Serial Port Driver for RTOS

  • ISR driven, ring buffered IO operation
  • IO operations are idle waiting, don't waste time in RTOS :D
  • Can use external buffers
  • Based on mbed RawSerial

Example

SerialDriver Example

#include "SerialDriver.h"

SerialDriver pc(USBTX, USBRX);

int main()
{
    // setup serial port
    pc.baud(9600);
    
    // print some text
    pc.puts("This is just a string.\r\n");
    pc.printf("But this is a %s with integer %i and float %f.\r\n", "formatted text", 123, 0.456f);
    
    // now lets behave like a null modem 
    while(1)
       pc.putc(pc.getc());
}

Look at the API Documentation for more Examples.

Dependencies

Import librarymbed

The official Mbed 2 C/C++ SDK provides the software platform and libraries to build your applications.

Last commit 20 Feb 2019 by mbed official

Import librarymbed-rtos

Official mbed Real Time Operating System based on the RTX implementation of the CMSIS-RTOS API open standard.

Last commit 04 Jul 2017 by mbed official

If you find a bug, please help me to fix it. Send me a message. You can help me a lot: Write a demo program that causes the bug reproducible.

Diff: Examples/Example_Blocking.cpp

Revision:
0:cd0d79be0c1a
Child:
1:1464146bd7fb
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Examples/Example_Blocking.cpp	Wed Jan 14 16:30:14 2015 +0000
@@ -0,0 +1,67 @@
+/// @file Example_Blocking.cpp
+/// @brief Test blocking write / read
+/// 
+/// - Uses SerialDriver with USBTX and USBRX.
+/// - Has much too small buffers, to how far can it get?
+/// 
+/// - Testing how much bytes were transmitted, with too small TX buffer and forced non blocking
+/// - Waiting till 10 bytes are received
+/// - LED4 indicates parallel thread working
+/// 
+
+#if 0
+
+#include "mbed.h"
+#include "SerialDriver.h"
+
+SerialDriver pc(USBTX, USBRX, 4, 32);
+
+// This thread is running in parallel
+DigitalOut led4(LED4);
+void parallel(void const * argument)
+{
+    while(1)
+    {
+        Thread::wait(20);
+        led4= !led4;
+    }
+}
+
+int main()
+{
+    // Start the other thread
+    Thread parallelTask(&parallel);
+    
+    
+    const char * completeText= "This is a complete text. How much will you receive?";
+    const int completeTextLength= strlen(completeText);
+    int writtenBytes;
+    
+    
+    const int readBufferLength= 10;
+    unsigned char readBuffer[readBufferLength];
+    int receivedBytes= 0;
+    
+    while(1)
+    {
+        // write non blocking, how much get transmitted?
+        writtenBytes= pc.write((const unsigned char*)completeText, completeTextLength, false);
+        
+        // now print the result
+        pc.printf("\r\nOnly %i of %i bytes were transmitted using non blocking write.\r\n", writtenBytes, completeTextLength);
+        
+        
+        // wait for 10 bytes
+        pc.printf("I wait for my 10 bytes. Send them!\r\n", writtenBytes, completeTextLength);
+        receivedBytes+= pc.read(readBuffer, readBufferLength);
+        
+        // now print result
+        pc.printf("Received %i bytes since start.\r\n\r\n", receivedBytes);
+        
+        
+        // wait a bit
+        Thread::wait(1000);
+    }
+}
+
+#endif