316 lines
7.8 KiB
C++
316 lines
7.8 KiB
C++
/*
|
|
Copyright (c) 2013 Arduino LLC. All right reserved.
|
|
|
|
This library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
This library 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with this library; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
#include "Bridge.h"
|
|
|
|
BridgeClass::BridgeClass(Stream &_stream) : index(0), stream(_stream), started(false) {
|
|
// Empty
|
|
}
|
|
|
|
void BridgeClass::begin() {
|
|
if (started)
|
|
return;
|
|
started = true;
|
|
|
|
// TODO: A more robust restart
|
|
|
|
// Wait for Atheros bootloader to finish startup
|
|
do {
|
|
dropAll();
|
|
delay(1100);
|
|
} while (available()>0);
|
|
|
|
// Bridge startup:
|
|
// - If the bridge is not running starts it safely
|
|
print(CTRL_C);
|
|
delay(250);
|
|
print(F("\n"));
|
|
delay(500);
|
|
print(F("\n"));
|
|
delay(750);
|
|
// Wait for OpenWRT message
|
|
// "Press enter to activate console"
|
|
print(F("run-bridge\n"));
|
|
delay(500);
|
|
dropAll();
|
|
|
|
// - If the bridge was already running previous commands
|
|
// are ignored as "invalid packets".
|
|
|
|
// Reset the brigde
|
|
uint8_t cmd[] = {'X','X'};
|
|
transfer(cmd, 2);
|
|
}
|
|
|
|
uint8_t BridgeClass::runCommand(String &command, uint8_t &err) {
|
|
uint8_t cmd[] = {'R'};
|
|
uint8_t res[2];
|
|
transfer(cmd, 1, (uint8_t*)command.c_str(), command.length(), res, 2);
|
|
err = res[0];
|
|
return res[1];
|
|
}
|
|
|
|
bool BridgeClass::commandIsRunning(uint8_t handle) {
|
|
uint8_t cmd[] = {'r', handle};
|
|
uint8_t res[1];
|
|
transfer(cmd, 2, res, 1);
|
|
return (res[0] == 1);
|
|
}
|
|
|
|
unsigned int BridgeClass::commandExitValue(uint8_t handle) {
|
|
uint8_t cmd[] = {'W', handle};
|
|
uint8_t res[2];
|
|
transfer(cmd, 2, res, 2);
|
|
return (res[0] << 8) + res[1];
|
|
}
|
|
|
|
void BridgeClass::cleanCommand(uint8_t handle) {
|
|
uint8_t cmd[] = {'w', handle};
|
|
transfer(cmd, 2);
|
|
}
|
|
|
|
unsigned int BridgeClass::commandOutputAvailable(uint8_t handle) {
|
|
uint8_t cmd[] = {'o', handle};
|
|
uint8_t res[1];
|
|
transfer(cmd, 2, res, 1);
|
|
return res[0];
|
|
}
|
|
|
|
unsigned int BridgeClass::readCommandOutput(uint8_t handle,
|
|
uint8_t *buffer, unsigned int size) {
|
|
if (size > 255)
|
|
size = 255;
|
|
uint8_t cmd[] = {'O', handle, size};
|
|
return transfer(cmd, 3, buffer, size);
|
|
}
|
|
|
|
void BridgeClass::writeCommandInput(uint8_t handle,
|
|
const uint8_t *buff, unsigned int size) {
|
|
uint8_t cmd[] = {'I', handle};
|
|
transfer(cmd, 2, buff, size, NULL, 0);
|
|
}
|
|
|
|
uint8_t BridgeClass::fileOpen(String &file, uint8_t mode, uint8_t &err) {
|
|
uint8_t cmd[] = {'F', mode};
|
|
uint8_t res[2];
|
|
transfer(cmd, 2, (uint8_t*)file.c_str(), file.length(), res, 2);
|
|
err = res[0];
|
|
return res[1];
|
|
}
|
|
|
|
void BridgeClass::fileClose(uint8_t handle) {
|
|
uint8_t cmd[] = {'f', handle};
|
|
transfer(cmd, 2);
|
|
}
|
|
|
|
unsigned int BridgeClass::fileRead(uint8_t handle, uint8_t *buff, unsigned int size, uint8_t &err) {
|
|
uint8_t s = size > 255 ? 255 : size-1;
|
|
uint8_t cmd[] = {'G', handle, s};
|
|
uint8_t l = transfer(cmd, 3, buff, size) - 1;
|
|
err = buff[0]; // First byte is error code
|
|
if (l>0) {
|
|
// Shift the reminder of buffer
|
|
for (uint8_t i=0; i<l; i++)
|
|
buff[i] = buff[i+1];
|
|
}
|
|
return l;
|
|
}
|
|
|
|
void BridgeClass::fileWrite(uint8_t handle, const uint8_t *buff, unsigned int size, uint8_t &err) {
|
|
uint8_t cmd[] = {'g', handle};
|
|
uint8_t res[1];
|
|
transfer(cmd, 2, buff, size, res, 1);
|
|
err = res[0];
|
|
}
|
|
|
|
void BridgeClass::fileSeek(uint8_t handle, uint32_t position, uint8_t &err) {
|
|
uint8_t cmd[] = {
|
|
's',
|
|
handle,
|
|
(position >> 24) & 0xFF,
|
|
(position >> 16) & 0xFF,
|
|
(position >> 8) & 0xFF,
|
|
position & 0xFF
|
|
};
|
|
uint8_t res[1];
|
|
transfer(cmd, 6, res, 1);
|
|
err = res[0];
|
|
}
|
|
|
|
unsigned int BridgeClass::readMessage(uint8_t *buff, unsigned int size) {
|
|
uint8_t tmp[] = { 'm' };
|
|
return transfer(tmp, 1, buff, size);
|
|
}
|
|
|
|
void BridgeClass::writeMessage(const uint8_t *buff, unsigned int size) {
|
|
uint8_t cmd[] = {'M'};
|
|
transfer(cmd, 1, buff, size, NULL, 0);
|
|
}
|
|
|
|
unsigned int BridgeClass::messageAvailable() {
|
|
uint8_t tmp[] = {'n'};
|
|
uint8_t res[2];
|
|
transfer(tmp, 1, res, 2);
|
|
return (res[0] << 8) + res[1];
|
|
}
|
|
|
|
void BridgeClass::put(const char *key, const char *value) {
|
|
// TODO: do it in a more efficient way
|
|
String cmd = "D";
|
|
cmd += key;
|
|
cmd += "\xFE";
|
|
cmd += value;
|
|
transfer((uint8_t*)cmd.c_str(), cmd.length());
|
|
}
|
|
|
|
unsigned int BridgeClass::get(const char *key, uint8_t *value, unsigned int maxlen) {
|
|
uint8_t cmd[] = {'d'};
|
|
unsigned int l = transfer(cmd, 1, (uint8_t *)key, strlen(key), value, maxlen);
|
|
if (l < maxlen)
|
|
value[l] = 0; // Zero-terminate string
|
|
return l;
|
|
}
|
|
|
|
void BridgeClass::crcUpdate(uint8_t c) {
|
|
CRC = CRC ^ c;
|
|
CRC = (CRC >> 8) + (CRC << 8);
|
|
}
|
|
|
|
void BridgeClass::crcReset() {
|
|
CRC = 0xAAAA;
|
|
}
|
|
|
|
void BridgeClass::crcWrite() {
|
|
write((char)(CRC >> 8));
|
|
write((char)(CRC & 0xFF));
|
|
}
|
|
|
|
bool BridgeClass::crcCheck(uint16_t _CRC) {
|
|
return CRC == _CRC;
|
|
}
|
|
|
|
uint8_t BridgeClass::transfer(const uint8_t *buff1, uint16_t len1,
|
|
const uint8_t *buff2, uint16_t len2,
|
|
const uint8_t *buff3, uint16_t len3,
|
|
uint8_t *rxbuff, uint16_t rxlen)
|
|
{
|
|
uint16_t len = len1 + len2 + len3;
|
|
for ( ; ; delay(100), dropAll() /* Delay for retransmission */) {
|
|
// Send packet
|
|
crcReset();
|
|
write((char)0xFF); // Start of packet (0xFF)
|
|
crcUpdate(0xFF);
|
|
write((char)index); // Message index
|
|
crcUpdate(index);
|
|
write((char)((len >> 8) & 0xFF)); // Message length (hi)
|
|
crcUpdate((len >> 8) & 0xFF);
|
|
write((char)(len & 0xFF)); // Message length (lo)
|
|
crcUpdate(len & 0xFF);
|
|
for (uint16_t i=0; i<len1; i++) { // Payload
|
|
write((char)buff1[i]);
|
|
crcUpdate(buff1[i]);
|
|
}
|
|
for (uint16_t i=0; i<len2; i++) { // Payload
|
|
write((char)buff2[i]);
|
|
crcUpdate(buff2[i]);
|
|
}
|
|
for (uint16_t i=0; i<len3; i++) { // Payload
|
|
write((char)buff3[i]);
|
|
crcUpdate(buff3[i]);
|
|
}
|
|
crcWrite(); // CRC
|
|
|
|
// Wait for ACK in 100ms
|
|
if (timedRead(100) != 0xFF)
|
|
continue;
|
|
crcReset();
|
|
crcUpdate(0xFF);
|
|
|
|
// Check packet index
|
|
if (timedRead(5) != index)
|
|
continue;
|
|
crcUpdate(index);
|
|
|
|
// Recv len
|
|
int lh = timedRead(5);
|
|
if (lh < 0)
|
|
continue;
|
|
crcUpdate(lh);
|
|
int ll = timedRead(5);
|
|
if (ll < 0)
|
|
continue;
|
|
crcUpdate(ll);
|
|
uint16_t l = lh;
|
|
l <<= 8;
|
|
l += ll;
|
|
|
|
// Recv data
|
|
for (uint16_t i=0; i<l; i++) {
|
|
int c = timedRead(5);
|
|
if (c < 0)
|
|
continue;
|
|
// Cut received data if rxbuffer is too small
|
|
if (i < rxlen)
|
|
rxbuff[i] = c;
|
|
crcUpdate(c);
|
|
}
|
|
|
|
// Check CRC
|
|
int crc_hi = timedRead(5);
|
|
if (crc_hi < 0)
|
|
continue;
|
|
int crc_lo = timedRead(5);
|
|
if (crc_lo < 0)
|
|
continue;
|
|
if (!crcCheck((crc_hi<<8)+crc_lo))
|
|
continue;
|
|
|
|
// Increase index
|
|
index++;
|
|
|
|
// Return bytes received
|
|
if (l > rxlen)
|
|
return rxlen;
|
|
return l;
|
|
}
|
|
}
|
|
|
|
int BridgeClass::timedRead(unsigned int timeout) {
|
|
int c;
|
|
unsigned long _startMillis = millis();
|
|
do {
|
|
c = read();
|
|
if (c >= 0) return c;
|
|
} while(millis() - _startMillis < timeout);
|
|
return -1; // -1 indicates timeout
|
|
}
|
|
|
|
void BridgeClass::dropAll() {
|
|
while (available() > 0) {
|
|
read();
|
|
}
|
|
}
|
|
|
|
// Bridge instance
|
|
#ifdef __AVR_ATmega32U4__
|
|
// Leonardo variants (where HardwareSerial is Serial1)
|
|
SerialBridgeClass Bridge(Serial1);
|
|
#else
|
|
SerialBridgeClass Bridge(Serial);
|
|
#endif
|