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Dependencies:   mbed

BufferSerial.cpp@7:0bc2bc07f2fe, 2020-12-02 (annotated)

Committer:
tetsu_0207
Date:
Wed Dec 02 08:06:45 2020 +0000
Revision:
7:0bc2bc07f2fe
Parent:
6:17e3a28338dc 
[Debug] success buffer serial library

Who changed what in which revision?

UserRevisionLine numberNew contents of line
tetsu_0207 6:17e3a28338dc 1 #include "BufferSerial.h"
tetsu_0207 6:17e3a28338dc 2
tetsu_0207 6:17e3a28338dc 3 BufferSerial::BufferSerial(PinName tx, PinName rx,int baud,int timeout)
tetsu_0207 6:17e3a28338dc 4 :RawSerial(tx,rx,baud)
tetsu_0207 6:17e3a28338dc 5 {
tetsu_0207 6:17e3a28338dc 6 // initialize functions
tetsu_0207 6:17e3a28338dc 7 _rx_buffer_head = 0;
tetsu_0207 6:17e3a28338dc 8 _rx_buffer_tail = 0;
tetsu_0207 6:17e3a28338dc 9 // time out
tetsu_0207 6:17e3a28338dc 10 timer_ms = timeout;
tetsu_0207 6:17e3a28338dc 11 timer.start();
tetsu_0207 6:17e3a28338dc 12 // attach
tetsu_0207 6:17e3a28338dc 13 RawSerial::attach(callback(this,&BufferSerial::serial_rx), Serial::RxIrq);
tetsu_0207 6:17e3a28338dc 14 }
tetsu_0207 6:17e3a28338dc 15
tetsu_0207 6:17e3a28338dc 16 int BufferSerial::available(void)
tetsu_0207 6:17e3a28338dc 17 {
tetsu_0207 6:17e3a28338dc 18 return ((unsigned int)(SERIAL_RX_BUFFER_SIZE + _rx_buffer_head - _rx_buffer_tail)) % SERIAL_RX_BUFFER_SIZE;
tetsu_0207 6:17e3a28338dc 19 }
tetsu_0207 6:17e3a28338dc 20
tetsu_0207 6:17e3a28338dc 21 int BufferSerial::read(void)
tetsu_0207 6:17e3a28338dc 22 {
tetsu_0207 6:17e3a28338dc 23 if (_rx_buffer_head == _rx_buffer_tail) {
tetsu_0207 6:17e3a28338dc 24 return -1;
tetsu_0207 6:17e3a28338dc 25 } else {
tetsu_0207 6:17e3a28338dc 26 unsigned char c = _rx_buffer[_rx_buffer_tail];
tetsu_0207 6:17e3a28338dc 27 _rx_buffer_tail = (rx_buffer_index_t)(_rx_buffer_tail + 1) % SERIAL_RX_BUFFER_SIZE;
tetsu_0207 6:17e3a28338dc 28 return c;
tetsu_0207 6:17e3a28338dc 29 }
tetsu_0207 6:17e3a28338dc 30 }
tetsu_0207 6:17e3a28338dc 31
tetsu_0207 6:17e3a28338dc 32 size_t BufferSerial::readBytesUntil(char charactor,char* buffer,int length)
tetsu_0207 6:17e3a28338dc 33 {
tetsu_0207 6:17e3a28338dc 34 size_t index = 0;
tetsu_0207 6:17e3a28338dc 35 while (index < length) {
tetsu_0207 6:17e3a28338dc 36 int c = timedRead();
tetsu_0207 6:17e3a28338dc 37 if (c < 0 || c == charactor){
tetsu_0207 6:17e3a28338dc 38 break;
tetsu_0207 6:17e3a28338dc 39 }
tetsu_0207 6:17e3a28338dc 40 *buffer++ = (char)c;
tetsu_0207 6:17e3a28338dc 41 index++;
tetsu_0207 6:17e3a28338dc 42 }
tetsu_0207 6:17e3a28338dc 43 return index;
tetsu_0207 6:17e3a28338dc 44 }
tetsu_0207 6:17e3a28338dc 45
tetsu_0207 6:17e3a28338dc 46 void BufferSerial::serial_rx(void)
tetsu_0207 6:17e3a28338dc 47 {
tetsu_0207 6:17e3a28338dc 48 while(RawSerial::readable()) {
tetsu_0207 6:17e3a28338dc 49 unsigned char c = RawSerial::getc();
tetsu_0207 6:17e3a28338dc 50 rx_buffer_index_t i = (unsigned int)(_rx_buffer_head + 1) % SERIAL_RX_BUFFER_SIZE;
tetsu_0207 6:17e3a28338dc 51 if (i != _rx_buffer_tail) {
tetsu_0207 6:17e3a28338dc 52 _rx_buffer[_rx_buffer_head] = c;
tetsu_0207 6:17e3a28338dc 53 _rx_buffer_head = i;
tetsu_0207 6:17e3a28338dc 54 }
tetsu_0207 6:17e3a28338dc 55 }
tetsu_0207 6:17e3a28338dc 56 }
tetsu_0207 6:17e3a28338dc 57
tetsu_0207 6:17e3a28338dc 58 int BufferSerial::timedRead()
tetsu_0207 6:17e3a28338dc 59 {
tetsu_0207 6:17e3a28338dc 60 int c;
tetsu_0207 6:17e3a28338dc 61 timer.reset();
tetsu_0207 6:17e3a28338dc 62 _startMillis = timer.read_ms();
tetsu_0207 6:17e3a28338dc 63 do {
tetsu_0207 6:17e3a28338dc 64 c = read();
tetsu_0207 6:17e3a28338dc 65 if (c >= 0) return c;
tetsu_0207 6:17e3a28338dc 66 } while(timer.read_ms() - _startMillis < _timeout);
tetsu_0207 6:17e3a28338dc 67 return -1; // -1 indicates timeout
tetsu_0207 6:17e3a28338dc 68 }