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Implement HardwareSerial::peek

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This commit is contained in:
Ivan Grokhotkov
2016-01-25 12:05:02 +03:00
parent 7960b63357
commit 16c0f3f1d5
3 changed files with 20 additions and 3 deletions
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17
cores/esp8266/HardwareSerial.cpp
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@ -33,7 +33,6 @@
HardwareSerial::HardwareSerial(int uart_nr)
: _uart_nr(uart_nr)
, _uart(0)
{}
void HardwareSerial::begin(unsigned long baud, SerialConfig config, SerialMode mode, uint8_t tx_pin)
@ -47,6 +46,7 @@ void HardwareSerial::begin(unsigned long baud, SerialConfig config, SerialMode m
}
_uart = uart_init(_uart_nr, baud, (int) config, (int) mode, tx_pin);
_peek_char = -1;
}
void HardwareSerial::end()
@ -118,6 +118,9 @@ int HardwareSerial::available(void)
}
int result = static_cast<int>(uart_rx_available(_uart));
if (_peek_char != -1) {
result += 1;
}
if (!result) {
optimistic_yield(USD(_uart_nr) / 128);
}
@ -126,7 +129,12 @@ int HardwareSerial::available(void)
int HardwareSerial::peek(void)
{
return -1;
if (_peek_char != -1) {
return _peek_char;
}
// this may return -1, but that's okay
_peek_char = uart_read_char(_uart);
return _peek_char;
}
int HardwareSerial::read(void)
@ -135,6 +143,11 @@ int HardwareSerial::read(void)
return -1;
}
if (_peek_char != -1) {
auto tmp = _peek_char;
_peek_char = -1;
return tmp;
}
return uart_read_char(_uart);
}