Tasmota/tasmota/xdrv_08_serial_bridge.ino

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/*
xdrv_08_serial_bridge.ino - serial bridge support for Tasmota
Copyright (C) 2019 Theo Arends and Dániel Zoltán Tolnai
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/>.
*/
#ifdef USE_SERIAL_BRIDGE
/*********************************************************************************************\
* Serial Bridge using Software Serial library (TasmotaSerial)
\*********************************************************************************************/
#define XDRV_08 8
const uint8_t SERIAL_BRIDGE_BUFFER_SIZE = 130;
const char kSerialBridgeCommands[] PROGMEM = "|" // No prefix
D_CMND_SSERIALSEND "|" D_CMND_SBAUDRATE;
void (* const SerialBridgeCommand[])(void) PROGMEM =
{ &CmndSSerialSend, &CmndSBaudrate };
#include <TasmotaSerial.h>
TasmotaSerial *SerialBridgeSerial = nullptr;
unsigned long serial_bridge_polling_window = 0;
char *serial_bridge_buffer = nullptr;
int serial_bridge_in_byte_counter = 0;
bool serial_bridge_active = true;
bool serial_bridge_raw = false;
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void SerialBridgeInput(void)
{
while (SerialBridgeSerial->available()) {
yield();
uint8_t serial_in_byte = SerialBridgeSerial->read();
if ((serial_in_byte > 127) && !serial_bridge_raw) { // Discard binary data above 127 if no raw reception allowed
serial_bridge_in_byte_counter = 0;
SerialBridgeSerial->flush();
return;
}
if (serial_in_byte || serial_bridge_raw) { // Any char between 1 and 127 or any char (0 - 255)
if ((serial_bridge_in_byte_counter < SERIAL_BRIDGE_BUFFER_SIZE -1) && // Add char to string if it still fits and ...
((isprint(serial_in_byte) && (128 == Settings.serial_delimiter)) || // Any char between 32 and 127
((serial_in_byte != Settings.serial_delimiter) && (128 != Settings.serial_delimiter)) || // Any char between 1 and 127 and not being delimiter
serial_bridge_raw)) { // Any char between 0 and 255
serial_bridge_buffer[serial_bridge_in_byte_counter++] = serial_in_byte;
serial_bridge_polling_window = millis(); // Wait for more data
} else {
serial_bridge_polling_window = 0; // Publish now
break;
}
}
}
if (serial_bridge_in_byte_counter && (millis() > (serial_bridge_polling_window + SERIAL_POLLING))) {
serial_bridge_buffer[serial_bridge_in_byte_counter] = 0; // Serial data completed
char hex_char[(serial_bridge_in_byte_counter * 2) + 2];
Response_P(PSTR(",\"" D_JSON_SSERIALRECEIVED "\":\"%s\"}"),
(serial_bridge_raw) ? ToHex_P((unsigned char*)serial_bridge_buffer, serial_bridge_in_byte_counter, hex_char, sizeof(hex_char)) : serial_bridge_buffer);
MqttPublishPrefixTopic_P(RESULT_OR_TELE, PSTR(D_JSON_SSERIALRECEIVED));
XdrvRulesProcess();
serial_bridge_in_byte_counter = 0;
}
}
/********************************************************************************************/
void SerialBridgeInit(void)
{
serial_bridge_active = false;
if ((pin[GPIO_SBR_RX] < 99) && (pin[GPIO_SBR_TX] < 99)) {
SerialBridgeSerial = new TasmotaSerial(pin[GPIO_SBR_RX], pin[GPIO_SBR_TX]);
if (SerialBridgeSerial->begin(Settings.sbaudrate * 300)) { // Baud rate is stored div 300 so it fits into 16 bits
if (SerialBridgeSerial->hardwareSerial()) {
ClaimSerial();
serial_bridge_buffer = serial_in_buffer; // Use idle serial buffer to save RAM
} else {
serial_bridge_buffer = (char*)(malloc(SERIAL_BRIDGE_BUFFER_SIZE));
}
serial_bridge_active = true;
SerialBridgeSerial->flush();
}
}
}
/*********************************************************************************************\
* Commands
\*********************************************************************************************/
void CmndSSerialSend(void)
{
if ((XdrvMailbox.index > 0) && (XdrvMailbox.index <= 5)) {
serial_bridge_raw = (XdrvMailbox.index > 3);
if (XdrvMailbox.data_len > 0) {
if (1 == XdrvMailbox.index) {
SerialBridgeSerial->write(XdrvMailbox.data, XdrvMailbox.data_len); // "Hello Tiger"
SerialBridgeSerial->write("\n"); // "\n"
}
else if ((2 == XdrvMailbox.index) || (4 == XdrvMailbox.index)) {
SerialBridgeSerial->write(XdrvMailbox.data, XdrvMailbox.data_len); // "Hello Tiger" or "A0"
}
else if (3 == XdrvMailbox.index) { // "Hello\f"
SerialBridgeSerial->write(Unescape(XdrvMailbox.data, &XdrvMailbox.data_len), XdrvMailbox.data_len);
}
else if (5 == XdrvMailbox.index) {
char *p;
char stemp[3];
uint8_t code;
char *codes = RemoveSpace(XdrvMailbox.data);
int size = strlen(XdrvMailbox.data);
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while (size > 1) {
strlcpy(stemp, codes, sizeof(stemp));
code = strtol(stemp, &p, 16);
SerialBridgeSerial->write(code); // "AA004566" as hex values
size -= 2;
codes += 2;
}
}
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ResponseCmndDone();
}
}
}
void CmndSBaudrate(void)
{
if (XdrvMailbox.payload >= 300) {
XdrvMailbox.payload /= 300; // Make it a valid baudrate
Settings.sbaudrate = XdrvMailbox.payload;
SerialBridgeSerial->begin(Settings.sbaudrate * 300); // Reinitialize serial port with new baud rate
}
ResponseCmndNumber(Settings.sbaudrate * 300);
}
/*********************************************************************************************\
* Interface
\*********************************************************************************************/
bool Xdrv08(uint8_t function)
{
bool result = false;
if (serial_bridge_active) {
switch (function) {
case FUNC_LOOP:
if (SerialBridgeSerial) { SerialBridgeInput(); }
break;
case FUNC_PRE_INIT:
SerialBridgeInit();
break;
case FUNC_COMMAND:
result = DecodeCommand(kSerialBridgeCommands, SerialBridgeCommand);
break;
}
}
return result;
}
#endif // USE_SERIAL_BRIDGE