Software serial, for when you are out of serial pins
Dependents: BufferedSoftSerial neurGAI_Seeed_BLUETOOTH LPC-SD-35 ESP-WROOM-02_test ... more
SoftSerial_rx.cpp
- Committer:
- Sissors
- Date:
- 2014-04-26
- Revision:
- 1:f8b4b764ace7
- Parent:
- 0:8edaa7abe724
- Child:
- 3:7238e9bb74d2
File content as of revision 1:f8b4b764ace7:
#include "SoftSerial.h" int SoftSerial::_getc( void ) { while(!readable()); out_valid = false; return out_buffer; } int SoftSerial::readable(void) { return out_valid; } //Start receiving byte void SoftSerial::rx_gpio_irq_handler(void) { rx->fall(NULL); rx_bit = 0; rx_error = false; rxout.attach_us(this, &SoftSerial::rx_handler, bit_period + (bit_period >> 1)); //Start reading first data byte }; void SoftSerial::rx_handler(void) { rx_bit++; rxout.attach_us(this, &SoftSerial::rx_handler, bit_period); //Receive data int val = rx->read(); if (rx_bit <= _bits) { read_buffer |= val << (rx_bit - 1); return; } //Receive parity bool parity_count; if (rx_bit == _bits + 1) { switch (_parity) { case Forced1: if (val == 0) rx_error = true; return; case Forced0: if (val == 1) rx_error = true; return; case Even: case Odd: parity_count = val; for (int i = 0; i<_bits; i++) { if (((read_buffer >> i) & 0x01) == 1) parity_count = !parity_count; } if ((parity_count) && (_parity == Even)) rx_error = true; if ((!parity_count) && (_parity == Odd)) rx_error = true; return; } } //Receive stop if (rx_bit < _bits + (bool)_parity + _stop_bits) { if (!val) rx_error = true; return; } //The last stop bit if (!val) rx_error = true; if (!rx_error) { out_valid = true; out_buffer = read_buffer; } read_buffer = 0; rxout.detach(); rx->fall(this, &SoftSerial::rx_gpio_irq_handler); }