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Revert "Match return value to type in available()"

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This reverts commit f40e471354.
Added an hint for the buffer sizes.

See #2057
Fixes #2367
This commit is contained in:
Cristian Maglie
2014-10-21 17:18:26 +02:00
parent 58b6fd4789
commit 62cf4b6b55
1 changed files with 3 additions and 1 deletions
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4
hardware/arduino/cores/arduino/HardwareSerial.cpp
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@ -53,6 +53,8 @@
// using a ring buffer (I think), in which head is the index of the location // using a ring buffer (I think), in which head is the index of the location
// to which to write the next incoming character and tail is the index of the // to which to write the next incoming character and tail is the index of the
// location from which to read. // location from which to read.
// NOTE: a "power of 2" buffer size is reccomended to dramatically
// optimize all the modulo operations for ring buffers.
#if (RAMEND < 1000) #if (RAMEND < 1000)
#define SERIAL_BUFFER_SIZE 16 #define SERIAL_BUFFER_SIZE 16
#else #else
@ -426,7 +428,7 @@ void HardwareSerial::end()
int HardwareSerial::available(void) int HardwareSerial::available(void)
{ {
return (int)(SERIAL_BUFFER_SIZE + _rx_buffer->head - _rx_buffer->tail) % SERIAL_BUFFER_SIZE; return ((unsigned int)(SERIAL_BUFFER_SIZE + _rx_buffer->head - _rx_buffer->tail)) % SERIAL_BUFFER_SIZE;
} }
int HardwareSerial::peek(void) int HardwareSerial::peek(void)