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| #include "crc16.h" // uit de DSRM library
#include <driver/uart.h>
// Configuratie constanten
#define P1_UART_NUM UART_NUM_2
#define P1_UART_RX_PIN 16
#define P1_UART_TX_PIN 17
#define P1_UART_BAUD 115200
#define P1_TELEGRAM_BUFFER_SIZE 2048 // Vergroot naar 2KB voor veiligheid
#define P1_START_CHAR '/'
#define P1_END_CHAR '!'
#define P1_CRC_LENGTH 4
#define P1_MAX_TIMEOUT 5000
#define P1_MAX_TELEGRAM_SIZE 1024 // Maximum grootte van één telegram
// Circulaire buffer implementatie
class CircularBuffer {
private:
uint8_t *buffer;
size_t capacity;
size_t readIndex;
size_t writeIndex;
size_t count;
public:
CircularBuffer(size_t size)
: capacity(size), readIndex(0), writeIndex(0), count(0) {
buffer = new uint8_t[size];
}
~CircularBuffer() { delete[] buffer; }
size_t available() const { return count; }
size_t freeSpace() const { return capacity - count; }
bool write(const uint8_t *data, size_t length) {
if (length > freeSpace())
return false;
for (size_t i = 0; i < length; i++) {
buffer[writeIndex] = data[i];
writeIndex = (writeIndex + 1) % capacity;
}
count += length;
return true;
}
size_t read(uint8_t *data, size_t length) {
length = (length < count) ? length : count;
for (size_t i = 0; i < length; i++) {
data[i] = buffer[readIndex];
readIndex = (readIndex + 1) % capacity;
}
count -= length;
return length;
}
void clear() { readIndex = writeIndex = count = 0; }
bool findPattern(const uint8_t *pattern, size_t patternLength,
size_t &position) {
for (size_t i = 0; i < count; i++) {
size_t pos = (readIndex + i) % capacity;
bool found = true;
for (size_t j = 0; j < patternLength && found; j++) {
if (buffer[(pos + j) % capacity] != pattern[j]) {
found = false;
}
}
if (found) {
position = i;
return true;
}
}
return false;
}
};
// Globale variabelen
CircularBuffer rxBuffer(P1_TELEGRAM_BUFFER_SIZE);
unsigned long lastValidTelegram = 0;
enum TelegramStatus {
TELEGRAM_OK,
TELEGRAM_NO_START,
TELEGRAM_NO_END,
TELEGRAM_INCOMPLETE,
TELEGRAM_TIMEOUT,
TELEGRAM_BUFFER_OVERFLOW,
TELEGRAM_CRC_ERROR
};
// Helper template voor veilige min operatie
template <typename T, typename U> T safe_min(T a, U b) {
return (a < static_cast<T>(b)) ? a : static_cast<T>(b);
}
// CRC functies
uint16_t hexStringToUint16(const char *hexStr) {
uint16_t value = 0;
sscanf(hexStr, "%4hx", &value);
return value;
}
uint16_t calculateCRC16(const uint8_t *data, size_t length) {
uint16_t crc = 0;
for (size_t i = 0; i < length; i++) {
crc = _crc16_update(crc, data[i]);
}
return crc;
}
bool validateCRC(const uint8_t *telegram, size_t length) {
if (length < P1_CRC_LENGTH + 1)
return false;
char crcStr[5];
memcpy(crcStr, telegram + length - P1_CRC_LENGTH, P1_CRC_LENGTH);
crcStr[4] = '\0';
uint16_t receivedCRC = hexStringToUint16(crcStr);
uint16_t calculatedCRC = calculateCRC16(telegram, length - P1_CRC_LENGTH);
return receivedCRC == calculatedCRC;
}
void setupP1UartDMA() {
uart_config_t uart_config = {.baud_rate = P1_UART_BAUD,
.data_bits = UART_DATA_8_BITS,
.parity = UART_PARITY_DISABLE,
.stop_bits = UART_STOP_BITS_1,
.flow_ctrl = UART_HW_FLOWCTRL_DISABLE};
// Reset UART voor een schone start
uart_driver_delete(P1_UART_NUM);
if (uart_driver_install(P1_UART_NUM, P1_TELEGRAM_BUFFER_SIZE * 2, 0, 0,
NULL, 0) != ESP_OK) {
Serial.println("UART driver installatie mislukt!");
return;
}
if (uart_param_config(P1_UART_NUM, &uart_config) != ESP_OK) {
Serial.println("UART configuratie mislukt!");
return;
}
if (uart_set_pin(P1_UART_NUM, P1_UART_TX_PIN, P1_UART_RX_PIN,
UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE) != ESP_OK) {
Serial.println("UART pin configuratie mislukt!");
return;
}
// Voeg deze regel toe voor invertering:
uart_set_line_inverse(P1_UART_NUM, UART_SIGNAL_RXD_INV);
uart_flush(P1_UART_NUM);
}
TelegramStatus processP1Telegram() {
static uint8_t tempBuffer[P1_MAX_TELEGRAM_SIZE];
size_t startPos = 0;
TelegramStatus result = TELEGRAM_NO_START;
// Zoek start character
uint8_t startPattern[] = {P1_START_CHAR};
if (!rxBuffer.findPattern(startPattern, 1, startPos)) {
return TELEGRAM_NO_START;
}
// Lees data tot aan start character
if (startPos > 0) {
rxBuffer.read(tempBuffer, startPos);
}
// Zoek end character en CRC
size_t available = rxBuffer.available();
size_t endPos = 0;
bool foundEnd = false;
for (size_t i = 0; i < available && endPos < P1_MAX_TELEGRAM_SIZE; i++) {
uint8_t byte;
rxBuffer.read(&byte, 1);
tempBuffer[endPos++] = byte;
if (byte == P1_END_CHAR) {
if (i + P1_CRC_LENGTH < available) {
// Lees CRC
rxBuffer.read(&tempBuffer[endPos], P1_CRC_LENGTH);
endPos += P1_CRC_LENGTH;
foundEnd = true;
break;
}
}
}
if (!foundEnd) {
return TELEGRAM_INCOMPLETE;
}
// Valideer CRC
if (!validateCRC(tempBuffer, endPos)) {
Serial.println("CRC validatie mislukt");
return TELEGRAM_CRC_ERROR;
}
// Verwerk geldig telegram
Serial.println("Geldig telegram ontvangen:");
Serial.write(tempBuffer, endPos);
Serial.println();
Serial.println();
lastValidTelegram = millis();
return TELEGRAM_OK;
}
void setup() {
Serial.begin(115200);
setupP1UartDMA();
Serial.println("P1 DMA Receiver gestart met verbeterde buffer handling");
lastValidTelegram = millis();
}
void loop() {
size_t length = 0;
if (uart_get_buffered_data_len(P1_UART_NUM, &length) != ESP_OK) {
Serial.println("Fout bij opvragen buffer lengte");
delay(100);
return;
}
if (length > 0) {
uint8_t tempBuffer[128]; // Kleine buffer voor incrementele lezen
size_t readSize = safe_min<size_t>(length, sizeof(tempBuffer));
int readLength =
uart_read_bytes(P1_UART_NUM, tempBuffer, readSize, 0);
// Nieuwe diagnostische logging
Serial.printf("Beschikbare bytes: %d, Gelezen bytes: %d\n", length,
readLength);
Serial.println("Bytes (HEX):");
for (int i = 0; i < readLength; i++) {
Serial.printf("%02X ", tempBuffer[i]);
}
Serial.println();
if (readLength > 0) {
if (!rxBuffer.write(tempBuffer, readLength)) {
Serial.println("Buffer vol, oudste data wordt verwijderd");
// Maak ruimte vrij in de buffer
size_t toRemove = safe_min<size_t>(
static_cast<size_t>(readLength), rxBuffer.available());
uint8_t dummy[128];
rxBuffer.read(dummy, toRemove);
rxBuffer.write(tempBuffer, readLength);
}
// Verwerk alle complete telegrammen in de buffer
while (rxBuffer.available() > 0) {
TelegramStatus status = processP1Telegram();
if (status == TELEGRAM_INCOMPLETE) {
break; // Wacht op meer data
}
if (status == TELEGRAM_CRC_ERROR) {
// Zoek naar volgend start karakter
size_t nextStart;
uint8_t startPattern[] = {P1_START_CHAR};
if (rxBuffer.findPattern(startPattern, 1, nextStart)) {
uint8_t dummy[128];
rxBuffer.read(dummy, nextStart);
}
}
}
}
}
// Check timeout
if (millis() - lastValidTelegram > P1_MAX_TIMEOUT) {
Serial.println("Timeout - geen geldig telegram ontvangen");
rxBuffer.clear();
uart_flush(P1_UART_NUM);
lastValidTelegram = millis();
}
taskYIELD(); // Laat andere taken ook draaien
} |
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