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asb_uart.cpp
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asb_uart.cpp
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/**
aSysBus UART interface
@copyright 2015-2017 Florian Knodt, www.adlerweb.info
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef ASB_UART__C
#define ASB_UART__C
#include "asb_uart.h"
#include "asb_proto.h"
ASB_UART::ASB_UART(Stream &serial) {
ASB_UART::_interface = &serial;
ASB_UART::_buf[0] = 0;
}
byte ASB_UART::begin() {
return 0;
}
bool ASB_UART::asbSend(byte type, unsigned int target, unsigned int source, char port, byte len, const byte *data) {
byte tlen = 0;
_interface->write(0x01);
_interface->print(type,HEX);
_interface->write(0x1F);
_interface->print(target,HEX);
_interface->write(0x1F);
_interface->print(source,HEX);
_interface->write(0x1F);
if(port > 0) {
_interface->print(port,HEX);
}else{
//Arduino print internally casts to double :(
_interface->print(F("FF"));
}
_interface->write(0x1F);
_interface->print(len,HEX);
_interface->write(0x02);
if(len > 0) {
for(tlen = 0; tlen < len; tlen++) {
_interface->print(data[tlen], HEX);
_interface->write(0x1F);
}
}
_interface->write(0x04);
_interface->println();
return true;
}
bool ASB_UART::bufShift(byte len) {
if(_buf[0] == 0) return false;
byte i;
while (len > 0) {
for(i = (_buf[0]-1); i > 0; i--) {
_buf[i] = _buf[(i+1)];
_buf[(i+1)] = 0;
}
len--;
_buf[0]--;
}
return true;
}
bool ASB_UART::bufShift() {
if(_buf[0] == 0) return false;
byte i;
do {
for(i = (_buf[0]-1); i > 0; i--) {
_buf[i] = _buf[(i+1)];
_buf[(i+1)] = 0;
}
_buf[0]--;
}while(_buf[1] != 0x01 && _buf[0] > 0);
return true;
}
bool ASB_UART::asbReceive(asbPacket &pkg) {
byte read;
byte state;
byte curwrite;
bool retry = false;
bool break2 = false;
if(!_interface->available()) return false;
while(_interface->available()) {
read = _interface->read();
if(read == 0x01) bufShift(_buf[0]);
do {
if(_buf[0] == 0) { //No active RX, ignore everything until SOH
if(read == 0x01) {
_buf[0] = 2;
_buf[1] = read;
}
}else{
_buf[_buf[0]] = read;
_buf[0]++;
if(_buf[(_buf[0]-1)] == 0x04 && _buf[0] >= 10) {
state = 0;
break2 = false;
for(read = 2; read <= _buf[0] && !break2; read++) {
switch(state) {
case 0:
pkg.meta.type = asbHexToByte(_buf[read]);
state++;
break;
case 1:
if(_buf[read] != 0x1F) {
retry = bufShift();
break2 = true;
break;
}else{
state++;
}
break;
case 2:
if(_buf[read] == 0x1F) {
state++;
}else{
pkg.meta.target <<=4;
pkg.meta.target |= asbHexToByte(_buf[read]);
}
break;
case 3:
if(_buf[read] == 0x1F) {
state++;
pkg.meta.port = 0;
}else{
pkg.meta.source <<=4;
pkg.meta.source |= asbHexToByte(_buf[read]);
}
break;
case 4:
if(_buf[read] == 0x1F) {
state++;
}else{
pkg.meta.port <<=4;
pkg.meta.port |= asbHexToByte(_buf[read]);
}
break;
case 5:
pkg.len = asbHexToByte(_buf[read]);
state++;
break;
case 6:
if(_buf[read] != 0x02) {
retry = bufShift();
break2 = true;
break;
}else{
curwrite=0;
state++;
}
break;
case 7:
if(_buf[read] == 0x1F) {
curwrite++;
pkg.data[curwrite] = 0;
}else if(_buf[read] == 0x04) {
state++;
}else{
pkg.data[curwrite] <<=4;
pkg.data[curwrite] |= asbHexToByte(_buf[read]);
}
break;
case 8:
bufShift(read);
return true;
}
}
}else if(_buf[0] > 23) {
retry = bufShift();
}
}
}while(retry);
}
return false;
}
byte ASB_UART::asbHexToByte(byte hex) {
if(hex >= '0' && hex <= '9') return hex-'0';
if(hex >= 'a' && hex <= 'f') return hex-'a'+10;
if(hex >= 'A' && hex <= 'F') return hex-'A'+10;
return 0;
}
#endif /* ASB_UART__C */