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Bridge.cpp
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Bridge.cpp
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/*
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), max_retries(0) {
// Empty
}
void BridgeClass::begin() {
if (started)
return;
started = true;
// Wait for U-boot to finish startup
do {
dropAll();
delay(1000);
} while (stream.available() > 0);
while (true) {
// Bridge interrupt:
// - Ask the bridge to close itself
uint8_t quit_cmd[] = {'X', 'X', 'X', 'X', 'X'};
max_retries = 1;
transfer(quit_cmd, 5);
// Bridge startup:
// - If the bridge is not running starts it safely
stream.print(CTRL_C);
delay(250);
stream.print(F("\n"));
delay(250);
stream.print(F("\n"));
delay(500);
// Wait for OpenWRT message
// "Press enter to activate console"
stream.print(F("run-bridge\n"));
delay(500);
dropAll();
// Reset the bridge to check if it is running
uint8_t cmd[] = {'X', 'X', '1', '0', '0'};
uint8_t res[4];
max_retries = 50;
uint16_t l = transfer(cmd, 5, res, 4);
if (l == TRANSFER_TIMEOUT) {
// Bridge didn't start...
// Maybe the board is starting-up?
// Wait and retry
delay(1000);
continue;
}
if (res[0] != 0)
while (true);
// Detect bridge version
if (l == 4) {
bridgeVersion = (res[1]-'0')*100 + (res[2]-'0')*10 + (res[3]-'0');
} else {
// Bridge v1.0.0 didn't send any version info
bridgeVersion = 100;
}
max_retries = 50;
return;
}
}
void BridgeClass::end() {
while (true) {
// Bridge interrupt:
// - Ask the bridge to close itself
uint8_t quit_cmd[] = {'X', 'X', 'X', 'X', 'X'};
max_retries = 1;
transfer(quit_cmd, 5);
delay(100);
stream.print(CTRL_C);
delay(250);
stream.print(F("cd \n"));
//expect a shell
bool done = false;
delay(100);
while (stream.available()) {
char c = stream.read();
if (c == '#') {
done = true;
break;
}
}
if (done) {
stream.print(F("reset\n"));
break;
}
}
delay(100);
dropAll();
}
void BridgeClass::put(const char *key, const char *value) {
// TODO: do it in a more efficient way
String cmd = "D";
uint8_t res[1];
cmd += key;
cmd += "\xFE";
cmd += value;
transfer((uint8_t*)cmd.c_str(), cmd.length(), res, 1);
}
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;
}
#if defined(ARDUINO_ARCH_AVR)
// AVR use an optimized implementation of CRC
#include <util/crc16.h>
#else
// Generic implementation for non-AVR architectures
uint16_t _crc_ccitt_update(uint16_t crc, uint8_t data)
{
data ^= crc & 0xff;
data ^= data << 4;
return ((((uint16_t)data << 8) | ((crc >> 8) & 0xff)) ^
(uint8_t)(data >> 4) ^
((uint16_t)data << 3));
}
#endif
void BridgeClass::crcUpdate(uint8_t c) {
CRC = _crc_ccitt_update(CRC, c);
}
void BridgeClass::crcReset() {
CRC = 0xFFFF;
}
void BridgeClass::crcWrite() {
stream.write((char)(CRC >> 8));
stream.write((char)(CRC & 0xFF));
}
bool BridgeClass::crcCheck(uint16_t _CRC) {
return CRC == _CRC;
}
uint16_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;
uint8_t retries = 0;
for ( ; retries < max_retries; retries++, delay(100), dropAll() /* Delay for retransmission */) {
// Send packet
crcReset();
stream.write((char)0xFF); // Start of packet (0xFF)
crcUpdate(0xFF);
stream.write((char)index); // Message index
crcUpdate(index);
stream.write((char)((len >> 8) & 0xFF)); // Message length (hi)
crcUpdate((len >> 8) & 0xFF);
stream.write((char)(len & 0xFF)); // Message length (lo)
crcUpdate(len & 0xFF);
for (uint16_t i = 0; i < len1; i++) { // Payload
stream.write((char)buff1[i]);
crcUpdate(buff1[i]);
}
for (uint16_t i = 0; i < len2; i++) { // Payload
stream.write((char)buff2[i]);
crcUpdate(buff2[i]);
}
for (uint16_t i = 0; i < len3; i++) { // Payload
stream.write((char)buff3[i]);
crcUpdate(buff3[i]);
}
crcWrite(); // CRC
// Wait for ACK in 200ms
if (timedRead(200) != 0xFF)
continue;
crcReset();
crcUpdate(0xFF);
// Check packet index
if (timedRead(5) != index)
continue;
crcUpdate(index);
// Recv len
int lh = timedRead(10);
if (lh < 0)
continue;
crcUpdate(lh);
int ll = timedRead(10);
if (ll < 0)
continue;
crcUpdate(ll);
uint16_t l = lh;
l <<= 8;
l += ll;
// Recv data
for (uint16_t i = 0; i < l; i++) {
// Cut received data if rxbuffer is too small
if (i >= rxlen)
break;
int c = timedRead(5);
if (c < 0)
continue;
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;
}
// Max retries exceeded
return TRANSFER_TIMEOUT;
}
int BridgeClass::timedRead(unsigned int timeout) {
int c;
unsigned long _startMillis = millis();
do {
c = stream.read();
if (c >= 0) return c;
} while (millis() - _startMillis < timeout);
return -1; // -1 indicates timeout
}
void BridgeClass::dropAll() {
while (stream.available() > 0) {
stream.read();
}
}
#if defined(ARDUINO_ARCH_SAM)
#include <Reset.h>
#endif
#if defined(ARDUINO_ARCH_SAM)
void checkForRemoteSketchUpdate(uint8_t pin) {
// The host force pin LOW to signal that a new sketch is coming
pinMode(pin, INPUT_PULLUP);
delay(50);
if (digitalRead(pin) == LOW) {
initiateReset(1);
while (true)
; // Wait for reset to SAM-BA
}
// Restore in standard state
pinMode(pin, INPUT);
}
#else
void checkForRemoteSketchUpdate(uint8_t /* pin */) {
// Empty, bootloader is enough.
}
#endif
// Bridge instance
#if defined(SERIAL_PORT_LINUXBRIDGE)
SerialBridgeClass Bridge(SERIAL_PORT_LINUXBRIDGE);
#elif defined(SERIAL_PORT_HARDWARE)
SerialBridgeClass Bridge(SERIAL_PORT_HARDWARE);
#elif defined(SERIAL_PORT_HARDWARE_OPEN)
SerialBridgeClass Bridge(SERIAL_PORT_HARDWARE_OPEN);
#elif defined(__AVR_ATmega32U4__) // Legacy fallback
// Leonardo variants (where HardwareSerial is Serial1)
SerialBridgeClass Bridge(Serial1);
#else
SerialBridgeClass Bridge(Serial);
#endif