mirror of
https://github.com/dalathegreat/Battery-Emulator.git
synced 2025-10-03 17:59:27 +02:00
505 lines
19 KiB
C++
505 lines
19 KiB
C++
// =================================================================================================
|
|
// eModbus: Copyright 2020 by Michael Harwerth, Bert Melis and the contributors to eModbus
|
|
// MIT license - see license.md for details
|
|
// =================================================================================================
|
|
#include "options.h"
|
|
#include "ModbusMessage.h"
|
|
#include "RTUutils.h"
|
|
#undef LOCAL_LOG_LEVEL
|
|
// #define LOCAL_LOG_LEVEL LOG_LEVEL_VERBOSE
|
|
#include "Logging.h"
|
|
|
|
// calcCRC: calculate Modbus CRC16 on a given array of bytes
|
|
uint16_t RTUutils::calcCRC(const uint8_t *data, uint16_t len) {
|
|
// CRC16 pre-calculated tables
|
|
const uint8_t crcHiTable[] = {
|
|
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
|
|
0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
|
|
0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01,
|
|
0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41,
|
|
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81,
|
|
0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0,
|
|
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01,
|
|
0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40,
|
|
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
|
|
0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
|
|
0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01,
|
|
0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
|
|
0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
|
|
0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0,
|
|
0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01,
|
|
0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41,
|
|
0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81,
|
|
0x40
|
|
};
|
|
|
|
const uint8_t crcLoTable[] = {
|
|
0x00, 0xC0, 0xC1, 0x01, 0xC3, 0x03, 0x02, 0xC2, 0xC6, 0x06, 0x07, 0xC7, 0x05, 0xC5, 0xC4,
|
|
0x04, 0xCC, 0x0C, 0x0D, 0xCD, 0x0F, 0xCF, 0xCE, 0x0E, 0x0A, 0xCA, 0xCB, 0x0B, 0xC9, 0x09,
|
|
0x08, 0xC8, 0xD8, 0x18, 0x19, 0xD9, 0x1B, 0xDB, 0xDA, 0x1A, 0x1E, 0xDE, 0xDF, 0x1F, 0xDD,
|
|
0x1D, 0x1C, 0xDC, 0x14, 0xD4, 0xD5, 0x15, 0xD7, 0x17, 0x16, 0xD6, 0xD2, 0x12, 0x13, 0xD3,
|
|
0x11, 0xD1, 0xD0, 0x10, 0xF0, 0x30, 0x31, 0xF1, 0x33, 0xF3, 0xF2, 0x32, 0x36, 0xF6, 0xF7,
|
|
0x37, 0xF5, 0x35, 0x34, 0xF4, 0x3C, 0xFC, 0xFD, 0x3D, 0xFF, 0x3F, 0x3E, 0xFE, 0xFA, 0x3A,
|
|
0x3B, 0xFB, 0x39, 0xF9, 0xF8, 0x38, 0x28, 0xE8, 0xE9, 0x29, 0xEB, 0x2B, 0x2A, 0xEA, 0xEE,
|
|
0x2E, 0x2F, 0xEF, 0x2D, 0xED, 0xEC, 0x2C, 0xE4, 0x24, 0x25, 0xE5, 0x27, 0xE7, 0xE6, 0x26,
|
|
0x22, 0xE2, 0xE3, 0x23, 0xE1, 0x21, 0x20, 0xE0, 0xA0, 0x60, 0x61, 0xA1, 0x63, 0xA3, 0xA2,
|
|
0x62, 0x66, 0xA6, 0xA7, 0x67, 0xA5, 0x65, 0x64, 0xA4, 0x6C, 0xAC, 0xAD, 0x6D, 0xAF, 0x6F,
|
|
0x6E, 0xAE, 0xAA, 0x6A, 0x6B, 0xAB, 0x69, 0xA9, 0xA8, 0x68, 0x78, 0xB8, 0xB9, 0x79, 0xBB,
|
|
0x7B, 0x7A, 0xBA, 0xBE, 0x7E, 0x7F, 0xBF, 0x7D, 0xBD, 0xBC, 0x7C, 0xB4, 0x74, 0x75, 0xB5,
|
|
0x77, 0xB7, 0xB6, 0x76, 0x72, 0xB2, 0xB3, 0x73, 0xB1, 0x71, 0x70, 0xB0, 0x50, 0x90, 0x91,
|
|
0x51, 0x93, 0x53, 0x52, 0x92, 0x96, 0x56, 0x57, 0x97, 0x55, 0x95, 0x94, 0x54, 0x9C, 0x5C,
|
|
0x5D, 0x9D, 0x5F, 0x9F, 0x9E, 0x5E, 0x5A, 0x9A, 0x9B, 0x5B, 0x99, 0x59, 0x58, 0x98, 0x88,
|
|
0x48, 0x49, 0x89, 0x4B, 0x8B, 0x8A, 0x4A, 0x4E, 0x8E, 0x8F, 0x4F, 0x8D, 0x4D, 0x4C, 0x8C,
|
|
0x44, 0x84, 0x85, 0x45, 0x87, 0x47, 0x46, 0x86, 0x82, 0x42, 0x43, 0x83, 0x41, 0x81, 0x80,
|
|
0x40
|
|
};
|
|
|
|
uint8_t crcHi = 0xFF;
|
|
uint8_t crcLo = 0xFF;
|
|
uint8_t index;
|
|
|
|
while (len--) {
|
|
index = crcLo ^ *data++;
|
|
crcLo = crcHi ^ crcHiTable[index];
|
|
crcHi = crcLoTable[index];
|
|
}
|
|
return (crcHi << 8 | crcLo);
|
|
}
|
|
|
|
// calcCRC: calculate Modbus CRC16 on a given message
|
|
uint16_t RTUutils::calcCRC(ModbusMessage msg) {
|
|
return calcCRC(msg.data(), msg.size());
|
|
}
|
|
|
|
|
|
// validCRC #1: check the given CRC in a block of data for correctness
|
|
bool RTUutils::validCRC(const uint8_t *data, uint16_t len) {
|
|
return validCRC(data, len - 2, data[len - 2] | (data[len - 1] << 8));
|
|
}
|
|
|
|
// validCRC #2: check the CRC of a block of data against a given one for equality
|
|
bool RTUutils::validCRC(const uint8_t *data, uint16_t len, uint16_t CRC) {
|
|
uint16_t crc16 = calcCRC(data, len);
|
|
if (CRC == crc16) return true;
|
|
return false;
|
|
}
|
|
|
|
// validCRC #3: check the given CRC in a message for correctness
|
|
bool RTUutils::validCRC(ModbusMessage msg) {
|
|
return validCRC(msg.data(), msg.size() - 2, msg[msg.size() - 2] | (msg[msg.size() - 1] << 8));
|
|
}
|
|
|
|
// validCRC #4: check the CRC of a message against a given one for equality
|
|
bool RTUutils::validCRC(ModbusMessage msg, uint16_t CRC) {
|
|
return validCRC(msg.data(), msg.size(), CRC);
|
|
}
|
|
|
|
// addCRC: calculate the CRC for a given RTUMessage and add it to the end
|
|
void RTUutils::addCRC(ModbusMessage& raw) {
|
|
uint16_t crc16 = calcCRC(raw.data(), raw.size());
|
|
raw.push_back(crc16 & 0xff);
|
|
raw.push_back((crc16 >> 8) & 0xFF);
|
|
}
|
|
|
|
// calculateInterval: determine the minimal gap time between messages
|
|
uint32_t RTUutils::calculateInterval(HardwareSerial& s, uint32_t overwrite) {
|
|
uint32_t interval = 0;
|
|
|
|
// silent interval is at least 3.5x character time
|
|
interval = 35000000UL / s.baudRate(); // 3.5 * 10 bits * 1000 µs * 1000 ms / baud
|
|
if (interval < 1750) interval = 1750; // lower limit according to Modbus RTU standard
|
|
// User overwrite?
|
|
if (overwrite > interval) {
|
|
interval = overwrite;
|
|
}
|
|
return interval;
|
|
}
|
|
|
|
// UARTinit: modify the UART FIFO copy trigger threshold
|
|
// This is normally set to 112 by default, resulting in short messages not being
|
|
// recognized fast enough for higher Modbus bus speeds
|
|
// Our default is 1 - every single byte arriving will have the UART FIFO
|
|
// copied to the serial buffer.
|
|
int RTUutils::UARTinit(HardwareSerial& serial, int thresholdBytes) {
|
|
int rc = 0;
|
|
#if NEED_UART_PATCH
|
|
// Is the threshold value valid? The UART FIFO is 128 bytes only
|
|
if (thresholdBytes > 0 && thresholdBytes < 128) {
|
|
// Yes, it is. Try to identify the Serial/Serial1/Serial2 the user has provided.
|
|
uart_dev_t *uart = nullptr;
|
|
uint8_t uart_num = 99;
|
|
if (&serial == &Serial) {
|
|
uart_num = 0;
|
|
uart = &UART0;
|
|
} else {
|
|
if (&serial == &Serial1) {
|
|
uart_num = 1;
|
|
uart = &UART1;
|
|
} else {
|
|
if (&serial == &Serial2) {
|
|
uart_num = 2;
|
|
uart = &UART2;
|
|
}
|
|
}
|
|
}
|
|
// Is it a defined serial?
|
|
if (uart_num != 99) {
|
|
// Yes. get the current value and set ours instead
|
|
rc = uart->conf1.rxfifo_full_thrhd;
|
|
uart->conf1.rxfifo_full_thrhd = thresholdBytes;
|
|
LOG_D("Serial%u FIFO threshold set to %d (was %d)\n", uart_num, thresholdBytes, rc);
|
|
} else {
|
|
LOG_W("Unable to identify serial\n");
|
|
}
|
|
} else {
|
|
LOG_E("Threshold must be between 1 and 127! (was %d)", thresholdBytes);
|
|
}
|
|
#endif
|
|
// Return the previous value in case someone likes to see it.
|
|
return rc;
|
|
}
|
|
|
|
// send: send a message via Serial, watching interval times - including CRC!
|
|
void RTUutils::send(HardwareSerial& serial, unsigned long& lastMicros, uint32_t interval, RTScallback rts, const uint8_t *data, uint16_t len, bool ASCIImode) {
|
|
// Clear serial buffers
|
|
while (serial.available()) serial.read();
|
|
|
|
// Treat ASCII differently
|
|
if (ASCIImode) {
|
|
// Toggle rtsPin, if necessary
|
|
rts(HIGH);
|
|
// Yes, ASCII mode. Send lead-in
|
|
serial.write(':');
|
|
|
|
uint16_t cnt = len;
|
|
uint8_t crc = 0;
|
|
uint8_t *cp = (uint8_t *)data;
|
|
|
|
// Loop over all bytes of the message
|
|
while (cnt--) {
|
|
// Write two nibbles as ASCII characters
|
|
serial.write(ASCIIwrite[(*cp >> 4) & 0x0F]);
|
|
serial.write(ASCIIwrite[*cp & 0x0F]);
|
|
// Advance CRC
|
|
crc += *cp;
|
|
// Next byte
|
|
cp++;
|
|
}
|
|
// Finalize CRC (2's complement)
|
|
crc = ~crc;
|
|
crc++;
|
|
// Write ist - two nibbles as ASCII characters
|
|
serial.write(ASCIIwrite[(crc >> 4) & 0x0F]);
|
|
serial.write(ASCIIwrite[crc & 0x0F]);
|
|
|
|
// Send lead-out
|
|
serial.write("\r\n");
|
|
serial.flush();
|
|
// Toggle rtsPin, if necessary
|
|
rts(LOW);
|
|
} else {
|
|
// RTU mode
|
|
uint16_t crc16 = calcCRC(data, len);
|
|
|
|
// Respect interval - we must not toggle rtsPin before
|
|
if (micros() - lastMicros < interval) delayMicroseconds(interval - (micros() - lastMicros));
|
|
|
|
// Toggle rtsPin, if necessary
|
|
rts(HIGH);
|
|
// Write message
|
|
serial.write(data, len);
|
|
// Write CRC in LSB order
|
|
serial.write(crc16 & 0xff);
|
|
serial.write((crc16 >> 8) & 0xFF);
|
|
serial.flush();
|
|
// Toggle rtsPin, if necessary
|
|
rts(LOW);
|
|
}
|
|
|
|
HEXDUMP_D("Sent packet", data, len);
|
|
|
|
// Mark end-of-message time for next interval
|
|
lastMicros = micros();
|
|
}
|
|
|
|
// send: send a message via Serial, watching interval times - including CRC!
|
|
void RTUutils::send(HardwareSerial& serial, unsigned long& lastMicros, uint32_t interval, RTScallback rts, ModbusMessage raw, bool ASCIImode) {
|
|
send(serial, lastMicros, interval, rts, raw.data(), raw.size(), ASCIImode);
|
|
}
|
|
|
|
// receive: get (any) message from Serial, taking care of timeout and interval
|
|
ModbusMessage RTUutils::receive(HardwareSerial& serial, uint32_t timeout, unsigned long& lastMicros, uint32_t interval, bool ASCIImode, bool skipLeadingZeroBytes) {
|
|
// Allocate initial receive buffer size: 1 block of BUFBLOCKSIZE bytes
|
|
const uint16_t BUFBLOCKSIZE(512);
|
|
uint8_t *buffer = new uint8_t[BUFBLOCKSIZE];
|
|
ModbusMessage rv;
|
|
|
|
// Index into buffer
|
|
uint16_t bufferPtr = 0;
|
|
// Byte read
|
|
int b = 0;
|
|
|
|
// State machine states, RTU mode
|
|
enum STATES : uint8_t { WAIT_DATA = 0, IN_PACKET, DATA_READ, FINISHED };
|
|
|
|
// State machine states, ASCII mode
|
|
enum ASTATES : uint8_t { A_WAIT_DATA = 0, A_DATA, A_WAIT_LEAD_OUT, A_FINISHED };
|
|
|
|
uint8_t state;
|
|
|
|
// Timeout tracker
|
|
unsigned long TimeOut = millis();
|
|
|
|
// RTU mode?
|
|
if (!ASCIImode) {
|
|
// Yes.
|
|
state = WAIT_DATA;
|
|
// interval tracker
|
|
lastMicros = micros();
|
|
|
|
while (state != FINISHED) {
|
|
switch (state) {
|
|
// WAIT_DATA: await first data byte, but watch timeout
|
|
case WAIT_DATA:
|
|
// Blindly try to read a byte
|
|
b = serial.read();
|
|
// Did we get one?
|
|
if (b >= 0) {
|
|
// Yes. Note the time.
|
|
lastMicros = micros();
|
|
// Do we need to skip it, if it is zero?
|
|
if (b > 0 || !skipLeadingZeroBytes) {
|
|
// No, we can go process it regularly
|
|
state = IN_PACKET;
|
|
}
|
|
} else {
|
|
// No, we had no byte. Just check the timeout period
|
|
if (millis() - TimeOut >= timeout) {
|
|
rv.push_back(TIMEOUT);
|
|
state = FINISHED;
|
|
}
|
|
delay(1);
|
|
}
|
|
break;
|
|
// IN_PACKET: read data until a gap of at least _interval time passed without another byte arriving
|
|
case IN_PACKET:
|
|
// Are we past the interval gap without another byte?
|
|
if (micros() - lastMicros >= interval) {
|
|
// Yes, terminate reading
|
|
LOG_V("%ldus without data\n", micros() - lastMicros);
|
|
state = DATA_READ;
|
|
} else {
|
|
// No, still in reading sequence
|
|
// Did we get a byte?
|
|
if (b >= 0) {
|
|
// Yes, collect it
|
|
buffer[bufferPtr++] = b;
|
|
// Mark time of last byte
|
|
lastMicros = micros();
|
|
// Buffer full?
|
|
if (bufferPtr >= BUFBLOCKSIZE) {
|
|
// Yes. Something fishy here - bail out!
|
|
rv.push_back(PACKET_LENGTH_ERROR);
|
|
state = FINISHED;
|
|
break;
|
|
}
|
|
}
|
|
// Buffer has space left - try to read another byte
|
|
b = serial.read();
|
|
}
|
|
break;
|
|
// DATA_READ: successfully gathered some data. Prepare return object.
|
|
case DATA_READ:
|
|
// Did we get a sensible buffer length?
|
|
HEXDUMP_D("Raw buffer received", buffer, bufferPtr);
|
|
if (bufferPtr >= 4)
|
|
{
|
|
// Yes. Check CRC
|
|
if (!validCRC(buffer, bufferPtr)) {
|
|
// Ooops. CRC is wrong.
|
|
rv.push_back(CRC_ERROR);
|
|
} else {
|
|
// CRC was fine, Now allocate response object without the CRC
|
|
for (uint16_t i = 0; i < bufferPtr - 2; ++i) {
|
|
rv.push_back(buffer[i]);
|
|
}
|
|
}
|
|
} else {
|
|
// No, packet was too short for anything usable. Return error
|
|
rv.push_back(PACKET_LENGTH_ERROR);
|
|
}
|
|
state = FINISHED;
|
|
break;
|
|
// FINISHED: we are done, clean up.
|
|
case FINISHED:
|
|
// CLear serial buffer in case something is left trailing
|
|
// May happen with servers too slow!
|
|
while (serial.available()) serial.read();
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
// We are in ASCII mode.
|
|
state = A_WAIT_DATA;
|
|
|
|
// Track nibbles in a byte
|
|
bool byteComplete = true;
|
|
|
|
// Track bytes read
|
|
bool hadBytes = false;
|
|
|
|
// ASCII crc byte
|
|
uint8_t crc = 0;
|
|
|
|
while (state != A_FINISHED) {
|
|
// Always watch timeout - 1s
|
|
if (millis() - TimeOut >= timeout) {
|
|
// Timeout! Bail out with error
|
|
rv.push_back(TIMEOUT);
|
|
state = A_FINISHED;
|
|
} else {
|
|
// Still in time. Check for another byte on serial
|
|
if (!hadBytes && serial.available()) {
|
|
b = serial.read();
|
|
if (b >= 0) {
|
|
hadBytes = true;
|
|
}
|
|
}
|
|
// Only use state machine with new data arrived
|
|
if (hadBytes) {
|
|
// First reset timeout
|
|
TimeOut = millis();
|
|
// Is it a valid character?
|
|
if ((b & 0x80) || ASCIIread[b] == 0xFF) {
|
|
// No. Report error and leave.
|
|
rv.clear();
|
|
rv.push_back(ASCII_INVALID_CHAR);
|
|
hadBytes = false;
|
|
state = A_FINISHED;
|
|
} else {
|
|
// Yes, is valid. Furtheron use interpreted byte
|
|
b = ASCIIread[b];
|
|
switch (state) {
|
|
// A_WAIT_DATA: await lead-in byte ':'
|
|
case A_WAIT_DATA:
|
|
// Is it the lead-in?
|
|
if (b == 0xF0) {
|
|
// Yes, proceed to data read state
|
|
state = A_DATA;
|
|
}
|
|
// byte was consumed in any case
|
|
hadBytes = false;
|
|
break;
|
|
// A_DATA: read data as it comes
|
|
case A_DATA:
|
|
// Lead-out byte 1 received?
|
|
if (b == 0xF1) {
|
|
// Yes. Was last buffer byte completed?
|
|
if (byteComplete) {
|
|
// Yes. Move to final state
|
|
state = A_WAIT_LEAD_OUT;
|
|
} else {
|
|
// No, signal with error
|
|
rv.push_back(PACKET_LENGTH_ERROR);
|
|
state = A_FINISHED;
|
|
}
|
|
} else {
|
|
// No lead-out, must be data byte.
|
|
// Is it valid?
|
|
if (b < 0xF0) {
|
|
// Yes. Add it into current buffer byte
|
|
buffer[bufferPtr] <<= 4;
|
|
buffer[bufferPtr] += (b & 0x0F);
|
|
// Advance nibble
|
|
byteComplete = !byteComplete;
|
|
// Was it the second of the byte?
|
|
if (byteComplete) {
|
|
// Yes. Advance CRC and move buffer pointer by one
|
|
crc += buffer[bufferPtr];
|
|
bufferPtr++;
|
|
buffer[bufferPtr] = 0;
|
|
}
|
|
} else {
|
|
// No, garbage. report error
|
|
rv.push_back(ASCII_INVALID_CHAR);
|
|
state = A_FINISHED;
|
|
}
|
|
}
|
|
hadBytes = false;
|
|
break;
|
|
// A_WAIT_LEAD_OUT: await \n
|
|
case A_WAIT_LEAD_OUT:
|
|
if (b == 0xF2) {
|
|
// Lead-out byte 2 received. Transfer buffer to returned message
|
|
HEXDUMP_D("Raw buffer received", buffer, bufferPtr);
|
|
// Did we get a sensible buffer length?
|
|
if (bufferPtr >= 3)
|
|
{
|
|
// Yes. Was the CRC calculated correctly?
|
|
if (crc == 0) {
|
|
// Yes, reduce buffer by 1 to get rid of CRC byte...
|
|
bufferPtr--;
|
|
// Move data into returned message
|
|
for (uint16_t i = 0; i < bufferPtr; ++i) {
|
|
rv.push_back(buffer[i]);
|
|
}
|
|
} else {
|
|
// No, CRC calculation seems to have failed
|
|
rv.push_back(ASCII_CRC_ERR);
|
|
}
|
|
} else {
|
|
// No, packet was too short for anything usable. Return error
|
|
rv.push_back(PACKET_LENGTH_ERROR);
|
|
}
|
|
} else {
|
|
// No lead out byte 2, but something else - report error.
|
|
rv.push_back(ASCII_FRAME_ERR);
|
|
}
|
|
state = A_FINISHED;
|
|
break;
|
|
// A_FINISHED: Message completed
|
|
case A_FINISHED:
|
|
// Clean up serial buffer
|
|
while (serial.available()) serial.read();
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
// No data received, so give the task scheduler room to breathe
|
|
delay(1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
// Deallocate buffer
|
|
delete[] buffer;
|
|
|
|
HEXDUMP_D("Received packet", rv.data(), rv.size());
|
|
|
|
return rv;
|
|
}
|
|
|
|
// Lower 7 bit ASCII characters - all invalid are set to 0xFF
|
|
const char RTUutils::ASCIIread[] = {
|
|
/* 00-07 */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
/* 08-0F */ 0xFF, 0xFF, 0xF2, 0xFF, 0xFF, 0xF1, 0xFF, 0xFF, // LF + CR
|
|
/* 10-17 */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
/* 18-1F */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
/* 20-27 */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
/* 28-2F */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
/* 30-37 */ 0, 1, 2, 3, 4, 5, 6, 7, // digits 0-7
|
|
/* 38-3F */ 8, 9, 0xF0, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // digits 8 + 9, :
|
|
/* 40-47 */ 0xFF, 10, 11, 12, 13, 14, 15, 0xFF, // digits A-F
|
|
/* 48-4F */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
/* 50-57 */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
/* 58-5F */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
/* 60-67 */ 0xFF, 10, 11, 12, 13, 14, 15, 0xFF, // digits a-f
|
|
/* 68-6F */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
/* 70-77 */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
|
|
/* 78-7F */ 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
|
|
};
|
|
|
|
// Writable ASCII chars for hex digits
|
|
const char RTUutils::ASCIIwrite[] = { 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
|
|
0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46
|
|
};
|