Tasmota/sonoff/xdrv_08_serial_bridge.ino

190 lines
7.2 KiB
C++

/*
xdrv_08_serial_bridge.ino - serial bridge support for Sonoff-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;
#include <TasmotaSerial.h>
enum SerialBridgeCommands { CMND_SSERIALSEND, CMND_SBAUDRATE };
const char kSerialBridgeCommands[] PROGMEM = D_CMND_SSERIALSEND "|" D_CMND_SBAUDRATE;
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;
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
if (!serial_bridge_raw) {
Response_P(PSTR("{\"" D_JSON_SSERIALRECEIVED "\":\"%s\"}"), serial_bridge_buffer);
} else {
Response_P(PSTR("{\"" D_JSON_SSERIALRECEIVED "\":\""));
for (uint32_t i = 0; i < serial_bridge_in_byte_counter; i++) {
ResponseAppend_P(PSTR("%02x"), serial_bridge_buffer[i]);
}
ResponseAppend_P(PSTR("\"}"));
}
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 * 1200)) { // Baud rate is stored div 1200 so it fits into one byte
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
\*********************************************************************************************/
bool SerialBridgeCommand(void)
{
char command [CMDSZ];
bool serviced = true;
int command_code = GetCommandCode(command, sizeof(command), XdrvMailbox.topic, kSerialBridgeCommands);
if (-1 == command_code) {
serviced = false; // Unknown command
}
else if ((CMND_SSERIALSEND == command_code) && (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);
while (size > 0) {
strlcpy(stemp, codes, sizeof(stemp));
code = strtol(stemp, &p, 16);
SerialBridgeSerial->write(code); // "AA004566" as hex values
size -= 2;
codes += 2;
}
}
Response_P(S_JSON_COMMAND_SVALUE, command, D_JSON_DONE);
}
}
else if (CMND_SBAUDRATE == command_code) {
char *p;
int baud = strtol(XdrvMailbox.data, &p, 10);
if (baud >= 1200) {
baud /= 1200; // Make it a valid baudrate
Settings.sbaudrate = (1 == XdrvMailbox.payload) ? SOFT_BAUDRATE / 1200 : baud;
SerialBridgeSerial->begin(Settings.sbaudrate * 1200); // Reinitialize serial port with new baud rate
}
Response_P(S_JSON_COMMAND_NVALUE, command, Settings.sbaudrate * 1200);
}
else serviced = false; // Unknown command
return serviced;
}
/*********************************************************************************************\
* 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 = SerialBridgeCommand();
break;
}
}
return result;
}
#endif // USE_SERIAL_BRIDGE