SoftSerial.cpp

00001 // Modified by K.Arai / JH1PJL     May 12th, 2020
00002 
00003 #include "SoftSerial.h"
00004 
00005 SoftSerial::SoftSerial(PinName TX, PinName RX, const char* name)
00006 {
00007     tx_en = rx_en = false;
00008     read_buffer = 0;
00009     if (TX != NC) {
00010         tx = new DigitalOut(TX);
00011         tx_en = true;
00012         tx->write(1);
00013         tx_bit = -1;
00014         txticker.attach(this, &SoftSerial::tx_handler);
00015     }
00016     if (RX != NC) {
00017         rx = new InterruptIn(RX);
00018         rx_en = true;
00019         out_valid = false;
00020         rxticker.attach(this, &SoftSerial::rx_handler);
00021         rx->fall(callback(this, &SoftSerial::rx_gpio_irq_handler));
00022     }
00023 
00024     baud(9600);
00025     format();
00026 }
00027 
00028 SoftSerial::~SoftSerial()
00029 {
00030     if (tx_en) {
00031         delete(tx);
00032     }
00033     if (rx_en) {
00034         delete(rx);
00035     }
00036 }
00037 
00038 void SoftSerial::baud(int baudrate)
00039 {
00040     bit_period = 1000000 / baudrate;
00041 }
00042 
00043 void SoftSerial::format(int bits, Parity parity, int stop_bits)
00044 {
00045     _bits = bits;
00046     _parity = parity;
00047     _stop_bits = stop_bits;
00048     _total_bits = 2 + _bits + _stop_bits + (bool)_parity;
00049 }