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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_printf.cpp

Revision:
0:cd0d79be0c1a
Child:
1:1464146bd7fb
diff -r 000000000000 -r cd0d79be0c1a Examples/Example_printf.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Examples/Example_printf.cpp	Wed Jan 14 16:30:14 2015 +0000
@@ -0,0 +1,48 @@
+/// @file Example_printf.cpp
+/// @brief Formatted output
+/// 
+/// - Uses SerialDriver with USBTX and USBRX.
+/// - Has much too small buffers, but printf is blocking, so it does not matter
+/// 
+/// - The terminal will be flooded with text
+/// - LED4 indicates parallel thread working
+/// 
+
+#if 0
+
+#include "mbed.h"
+#include "SerialDriver.h"
+
+// only 4 byte of software ring buffer?
+// No problem! SerialDriver uses idle blocking calls :D
+SerialDriver pc(USBTX, USBRX, 4, 4);
+
+// 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);
+    
+    float f= 0.0f;    
+    while(1)
+    {
+        // unformatted text
+        pc.puts("Hi! this uses puts.\r\n");
+        
+        // formatted text
+        pc.printf("And this is formatted. Here is the sin(%f)=%f.\r\n", f, sinf(f));
+        f+= 0.25f;
+    }
+}
+
+#endif