Sam Grove / BufferedSerial

Inherit from Serial and use software buffers for TX and RX. This allows the UART peripherals to operate in a IRQ driven mode. Overrides most (but not all) stdio functions as Serial did

Dependencies:   Buffer

Dependents:   buffered_serial_test BLE_Police_HRM evena_BLE_Police_HRM df-2014-workshop-rfid-case-generator-k64f ... more

Example

 #include "mbed.h"
 #include "BufferedSerial.h"

 BufferedSerial pc(USBTX, USBRX);

 int main()
 {
     pc.baud(115200);
   
     while(1)
     {
         Timer s;
       
         s.start();
         pc.printf("Hello World - buff\n");
         int buffered_time = s.read_us();
         wait(0.1f); // give time for the buffer to empty
       
         s.reset();
         printf("Hello World - poll\n");
         int polled_time = s.read_us();
         s.stop();
         wait(0.1f); // give time for the buffer to empty
       
         pc.printf("printf buffered took %d us\n", buffered_time);
         pc.printf("printf polled took %d us\n", polled_time);
         wait(0.5f);
     }
 }

Files at this revision

API Documentation at this revision

Revision 8:506247a040bc, committed 2015-01-04

Comitter:
ansond
Date:
Sun Jan 04 22:15:53 2015 +0000
Parent:
7:6fa214b41d73
Child:
9:2cb30392ade6
Commit message:
increased buffer sizes more

Changed in this revision

BufferedSerial.cpp Show annotated file Show diff for this revision Revisions of this file
BufferedSerial.h Show annotated file Show diff for this revision Revisions of this file 
--- a/BufferedSerial.cpp	Fri Jan 02 03:47:26 2015 +0000
+++ b/BufferedSerial.cpp	Sun Jan 04 22:15:53 2015 +0000
@@ -24,7 +24,7 @@
 #include <stdarg.h>
 
 BufferedSerial::BufferedSerial(PinName tx, PinName rx, const char* name)
-    : SERIAL_BASE(tx, rx), _rxbuf(BUFFEREDSERIAL_MAX_BUFFER_SIZE), _txbuf(BUFFEREDSERIAL_MAX_BUFFER_SIZE)
+    : SERIAL_BASE(tx, rx) , _rxbuf(2*BUFFEREDSERIAL_MAX_BUFFER_SIZE), _txbuf(2*BUFFEREDSERIAL_MAX_BUFFER_SIZE)
 {
     SERIAL_BASE::attach(this, &BufferedSerial::rxIrq, Serial::RxIrq);
     

--- a/BufferedSerial.h	Fri Jan 02 03:47:26 2015 +0000
+++ b/BufferedSerial.h	Sun Jan 04 22:15:53 2015 +0000
@@ -30,8 +30,8 @@
 // Base Class
 #define SERIAL_BASE  RawSerial
 
-// Internal buffer size
-#define BUFFEREDSERIAL_MAX_BUFFER_SIZE   512
+// Internal buffer size (Ring buffers will be 2X this value each for RX and TX...)
+#define BUFFEREDSERIAL_MAX_BUFFER_SIZE   4096
 
 /** A serial port (UART) for communication with other serial devices
  *