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
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); } }
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 *