PEDRO MATIZ / Mbed 2 deprecated CHATSERIAL

CHAT SERIAL

Dependencies:   mbed

7043853_softserial/SoftSerial_rx.cpp@0:6f1384d9a913, 2017-09-30 (annotated)

Committer:
ABD931
Date:
Sat Sep 30 21:03:52 2017 +0000
Revision:
0:6f1384d9a913
PROGRAMA DE CHAT SERIAL

Who changed what in which revision?

UserRevisionLine numberNew contents of line
ABD931 0:6f1384d9a913 1 #include "SoftSerial.h"
ABD931 0:6f1384d9a913 2
ABD931 0:6f1384d9a913 3 uint32_t overhead_us = 200 * 1000000 / SystemCoreClock; //Random estimation of the overhead of mbed libs, makes slow devices like LPC812 @ 12MHz perform better
ABD931 0:6f1384d9a913 4
ABD931 0:6f1384d9a913 5 int SoftSerial::_getc( void ) {
ABD931 0:6f1384d9a913 6 while(!readable());
ABD931 0:6f1384d9a913 7 out_valid = false;
ABD931 0:6f1384d9a913 8 return out_buffer;
ABD931 0:6f1384d9a913 9 }
ABD931 0:6f1384d9a913 10
ABD931 0:6f1384d9a913 11 int SoftSerial::readable(void) {
ABD931 0:6f1384d9a913 12 return out_valid;
ABD931 0:6f1384d9a913 13 }
ABD931 0:6f1384d9a913 14
ABD931 0:6f1384d9a913 15 //Start receiving byte
ABD931 0:6f1384d9a913 16 void SoftSerial::rx_gpio_irq_handler(void) {
ABD931 0:6f1384d9a913 17 rxticker.prime();
ABD931 0:6f1384d9a913 18 rxticker.setNext(bit_period + (bit_period >> 1) - overhead_us);
ABD931 0:6f1384d9a913 19 rx->fall(NULL);
ABD931 0:6f1384d9a913 20 rx_bit = 0;
ABD931 0:6f1384d9a913 21 rx_error = false;
ABD931 0:6f1384d9a913 22 };
ABD931 0:6f1384d9a913 23
ABD931 0:6f1384d9a913 24 void SoftSerial::rx_handler(void) {
ABD931 0:6f1384d9a913 25 //Receive data
ABD931 0:6f1384d9a913 26 int val = rx->read();
ABD931 0:6f1384d9a913 27
ABD931 0:6f1384d9a913 28 rxticker.setNext(bit_period);
ABD931 0:6f1384d9a913 29 rx_bit++;
ABD931 0:6f1384d9a913 30
ABD931 0:6f1384d9a913 31
ABD931 0:6f1384d9a913 32 if (rx_bit <= _bits) {
ABD931 0:6f1384d9a913 33 read_buffer |= val << (rx_bit - 1);
ABD931 0:6f1384d9a913 34 return;
ABD931 0:6f1384d9a913 35 }
ABD931 0:6f1384d9a913 36
ABD931 0:6f1384d9a913 37 //Receive parity
ABD931 0:6f1384d9a913 38 bool parity_count;
ABD931 0:6f1384d9a913 39 if (rx_bit == _bits + 1) {
ABD931 0:6f1384d9a913 40 switch (_parity) {
ABD931 0:6f1384d9a913 41 case Forced1:
ABD931 0:6f1384d9a913 42 if (val == 0)
ABD931 0:6f1384d9a913 43 rx_error = true;
ABD931 0:6f1384d9a913 44 return;
ABD931 0:6f1384d9a913 45 case Forced0:
ABD931 0:6f1384d9a913 46 if (val == 1)
ABD931 0:6f1384d9a913 47 rx_error = true;
ABD931 0:6f1384d9a913 48 return;
ABD931 0:6f1384d9a913 49 case Even:
ABD931 0:6f1384d9a913 50 case Odd:
ABD931 0:6f1384d9a913 51 parity_count = val;
ABD931 0:6f1384d9a913 52 for (int i = 0; i<_bits; i++) {
ABD931 0:6f1384d9a913 53 if (((read_buffer >> i) & 0x01) == 1)
ABD931 0:6f1384d9a913 54 parity_count = !parity_count;
ABD931 0:6f1384d9a913 55 }
ABD931 0:6f1384d9a913 56 if ((parity_count) && (_parity == Even))
ABD931 0:6f1384d9a913 57 rx_error = true;
ABD931 0:6f1384d9a913 58 if ((!parity_count) && (_parity == Odd))
ABD931 0:6f1384d9a913 59 rx_error = true;
ABD931 0:6f1384d9a913 60 return;
ABD931 0:6f1384d9a913 61 }
ABD931 0:6f1384d9a913 62 }
ABD931 0:6f1384d9a913 63
ABD931 0:6f1384d9a913 64 //Receive stop
ABD931 0:6f1384d9a913 65 if (rx_bit < _bits + (bool)_parity + _stop_bits) {
ABD931 0:6f1384d9a913 66 if (!val)
ABD931 0:6f1384d9a913 67 rx_error = true;
ABD931 0:6f1384d9a913 68 return;
ABD931 0:6f1384d9a913 69 }
ABD931 0:6f1384d9a913 70
ABD931 0:6f1384d9a913 71 //The last stop bit
ABD931 0:6f1384d9a913 72 if (!val)
ABD931 0:6f1384d9a913 73 rx_error = true;
ABD931 0:6f1384d9a913 74
ABD931 0:6f1384d9a913 75 if (!rx_error) {
ABD931 0:6f1384d9a913 76 out_valid = true;
ABD931 0:6f1384d9a913 77 out_buffer = read_buffer;
ABD931 0:6f1384d9a913 78 fpointer[RxIrq].call();
ABD931 0:6f1384d9a913 79 }
ABD931 0:6f1384d9a913 80 read_buffer = 0;
ABD931 0:6f1384d9a913 81 rxticker.detach();
ABD931 0:6f1384d9a913 82 rx->fall(this, &SoftSerial::rx_gpio_irq_handler);
ABD931 0:6f1384d9a913 83 }
ABD931 0:6f1384d9a913 84