Son Hai Nguyen / SoftSerial

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

Fork of SoftSerial by Erik -

SoftSerial_rx.cpp@6:517082212c00, 2014-04-27 (annotated)

Committer:
Sissors
Date:
Sun Apr 27 08:33:17 2014 +0000
Revision:
6:517082212c00
Parent:
4:c010265ed202
Child:
10:236fce2e5b8c
Added custom ticker lib to allow for baudrate up to 57600

Who changed what in which revision?

UserRevisionLine numberNew contents of line
Sissors 0:8edaa7abe724 1 #include "SoftSerial.h"
Sissors 0:8edaa7abe724 2
Sissors 0:8edaa7abe724 3 int SoftSerial::_getc( void ) {
Sissors 1:f8b4b764ace7 4 while(!readable());
Sissors 1:f8b4b764ace7 5 out_valid = false;
Sissors 1:f8b4b764ace7 6 return out_buffer;
Sissors 1:f8b4b764ace7 7 }
Sissors 0:8edaa7abe724 8
Sissors 1:f8b4b764ace7 9 int SoftSerial::readable(void) {
Sissors 1:f8b4b764ace7 10 return out_valid;
Sissors 1:f8b4b764ace7 11 }
Sissors 1:f8b4b764ace7 12
Sissors 1:f8b4b764ace7 13 //Start receiving byte
Sissors 0:8edaa7abe724 14 void SoftSerial::rx_gpio_irq_handler(void) {
Sissors 6:517082212c00 15 rxticker.prime();
Sissors 6:517082212c00 16 rxticker.setNext(bit_period + (bit_period >> 1));
Sissors 1:f8b4b764ace7 17 rx->fall(NULL);
Sissors 1:f8b4b764ace7 18 rx_bit = 0;
Sissors 1:f8b4b764ace7 19 rx_error = false;
Sissors 0:8edaa7abe724 20 };
Sissors 1:f8b4b764ace7 21
Sissors 1:f8b4b764ace7 22 void SoftSerial::rx_handler(void) {
Sissors 6:517082212c00 23 rxticker.setNext(bit_period);
Sissors 1:f8b4b764ace7 24 rx_bit++;
Sissors 1:f8b4b764ace7 25
Sissors 1:f8b4b764ace7 26 //Receive data
Sissors 1:f8b4b764ace7 27 int val = rx->read();
Sissors 1:f8b4b764ace7 28 if (rx_bit <= _bits) {
Sissors 1:f8b4b764ace7 29 read_buffer |= val << (rx_bit - 1);
Sissors 1:f8b4b764ace7 30 return;
Sissors 1:f8b4b764ace7 31 }
Sissors 1:f8b4b764ace7 32
Sissors 1:f8b4b764ace7 33 //Receive parity
Sissors 1:f8b4b764ace7 34 bool parity_count;
Sissors 1:f8b4b764ace7 35 if (rx_bit == _bits + 1) {
Sissors 1:f8b4b764ace7 36 switch (_parity) {
Sissors 1:f8b4b764ace7 37 case Forced1:
Sissors 1:f8b4b764ace7 38 if (val == 0)
Sissors 1:f8b4b764ace7 39 rx_error = true;
Sissors 1:f8b4b764ace7 40 return;
Sissors 1:f8b4b764ace7 41 case Forced0:
Sissors 1:f8b4b764ace7 42 if (val == 1)
Sissors 1:f8b4b764ace7 43 rx_error = true;
Sissors 1:f8b4b764ace7 44 return;
Sissors 1:f8b4b764ace7 45 case Even:
Sissors 1:f8b4b764ace7 46 case Odd:
Sissors 1:f8b4b764ace7 47 parity_count = val;
Sissors 1:f8b4b764ace7 48 for (int i = 0; i<_bits; i++) {
Sissors 1:f8b4b764ace7 49 if (((read_buffer >> i) & 0x01) == 1)
Sissors 1:f8b4b764ace7 50 parity_count = !parity_count;
Sissors 1:f8b4b764ace7 51 }
Sissors 1:f8b4b764ace7 52 if ((parity_count) && (_parity == Even))
Sissors 1:f8b4b764ace7 53 rx_error = true;
Sissors 1:f8b4b764ace7 54 if ((!parity_count) && (_parity == Odd))
Sissors 1:f8b4b764ace7 55 rx_error = true;
Sissors 1:f8b4b764ace7 56 return;
Sissors 1:f8b4b764ace7 57 }
Sissors 1:f8b4b764ace7 58 }
Sissors 1:f8b4b764ace7 59
Sissors 1:f8b4b764ace7 60 //Receive stop
Sissors 1:f8b4b764ace7 61 if (rx_bit < _bits + (bool)_parity + _stop_bits) {
Sissors 1:f8b4b764ace7 62 if (!val)
Sissors 1:f8b4b764ace7 63 rx_error = true;
Sissors 1:f8b4b764ace7 64 return;
Sissors 1:f8b4b764ace7 65 }
Sissors 1:f8b4b764ace7 66
Sissors 1:f8b4b764ace7 67 //The last stop bit
Sissors 1:f8b4b764ace7 68 if (!val)
Sissors 1:f8b4b764ace7 69 rx_error = true;
Sissors 1:f8b4b764ace7 70
Sissors 1:f8b4b764ace7 71 if (!rx_error) {
Sissors 1:f8b4b764ace7 72 out_valid = true;
Sissors 1:f8b4b764ace7 73 out_buffer = read_buffer;
Sissors 4:c010265ed202 74 fpointer[RxIrq].call();
Sissors 1:f8b4b764ace7 75 }
Sissors 1:f8b4b764ace7 76 read_buffer = 0;
Sissors 3:7238e9bb74d2 77 rxticker.detach();
Sissors 1:f8b4b764ace7 78 rx->fall(this, &SoftSerial::rx_gpio_irq_handler);
Sissors 1:f8b4b764ace7 79 }
Sissors 1:f8b4b764ace7 80