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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.

Files at this revision

API Documentation at this revision

Revision 4:a41e47716932, committed 2015-10-23

Comitter:
BlazeX
Date:
Fri Oct 23 13:49:19 2015 +0000
Parent:
3:ea9719695b6a
Child:
5:cb9007ef1a30
Commit message:
BETA update.
; Trying to make SerialDriver compatible with KL25Z and KL46Z. Test at your own risk.

Changed in this revision

SerialDriver.cpp Show annotated file Show diff for this revision Revisions of this file 
--- a/SerialDriver.cpp	Mon Jan 26 19:21:56 2015 +0000
+++ b/SerialDriver.cpp	Fri Oct 23 13:49:19 2015 +0000
@@ -42,6 +42,9 @@
     // attach interrupt routines
     attach(this, &SerialDriver::onTxIrq, TxIrq);
     attach(this, &SerialDriver::onRxIrq, RxIrq);
+    
+    // we need tx interrupt not yet
+    disableTxInterrupt();
 }
 
 int SerialDriver::putc(int c, unsigned int timeoutMs)
@@ -88,7 +91,8 @@
     
     // write as long as you can
     bool wasFull= isTxBufferFull();
-    while(SerialBase::writeable() && !isTxBufferEmtpy())
+    bool wasEmpty= isTxBufferEmtpy();
+    while(SerialBase::writeable() && !wasEmpty)
     {
         // take byte from tx buffer and put it out
         SerialBase::_base_putc(txBuffer[txOut]);
@@ -100,7 +104,10 @@
         semTxBufferFull.release();
     
     // ok, let's wait for next writability
-    enableTxInterrupt();
+    // if the is something to send,  
+    // else we need tx interrupt not yet
+    if(wasEmpty);
+        enableTxInterrupt();
 }
 
 
@@ -210,6 +217,8 @@
     
     int length= vsnprintf(NULL, 0, format, arg);
     char *temp = new char[length + 1];
+    if(temp == NULL)
+        return 0;   // I can't work like this!    
     vsprintf(temp, format, arg);
     puts(temp, true);
     delete[] temp;