use nonblocking write for serial

lib/log/GWLog.cpp

@@ -1,25 +1,38 @@
 #include "GwLog.h"
 
-GwLog::GwLog(bool logSerial, int level){
+class DefaultLogWriter: public GwLogWriter{
-    this->logSerial=logSerial;
+    public:
+        virtual ~DefaultLogWriter(){};
+        virtual void write(const char *data){
+            Serial.print(data);
+        }
+};
+
+GwLog::GwLog(int level, GwLogWriter *writer){
     logLevel=level;
+    if (writer == NULL) writer=new DefaultLogWriter();
+    this->writer=writer;
 }
 void GwLog::logString(const char *fmt,...){
+    if (! writer) return;
     va_list args;
     va_start(args,fmt);
     vsnprintf(buffer,99,fmt,args);
-    if (logSerial){
+    writer->write(prefix.c_str());
-        Serial.print("LOG: ");
+    writer->write(buffer);
-        Serial.println(buffer);
+    writer->write("\n");
-    }
 }
 void GwLog::logDebug(int level,const char *fmt,...){
     if (level > logLevel) return;
+    if (! writer) return;
     va_list args;
     va_start(args,fmt);
     vsnprintf(buffer,99,fmt,args);
-    if (logSerial){
+    writer->write(prefix.c_str());
-        Serial.print("LOG: ");
+    writer->write(buffer);
-        Serial.println(buffer);
+    writer->write("\n");
-    }
+}
+void GwLog::setWriter(GwLogWriter *writer){
+    if (this->writer) delete this->writer;
+    this->writer=writer;
 }

lib/log/GwLog.h

@@ -1,17 +1,25 @@
 #ifndef _GWLOG_H
 #define _GWLOG_H
 #include <Arduino.h>
+
+class GwLogWriter{
+    public:
+        virtual ~GwLogWriter(){}
+        virtual void write(const char *data)=0;
+};
 class GwLog{
     private:
         char buffer[100];
-        bool logSerial=false;
         int logLevel=1;
+        GwLogWriter *writer;
     public:
         static const int LOG=1;
         static const int ERROR=0;
         static const int DEBUG=3;
         static const int TRACE=2;
-        GwLog(bool logSerial,int level=LOG);
+        String prefix="LOG:";
+        GwLog(int level=LOG, GwLogWriter *writer=NULL);
+        void setWriter(GwLogWriter *writer);
         void logString(const char *fmt,...);
         void logDebug(int level, const char *fmt,...);
         int isActive(int level){return level <= logLevel;};

lib/serial/GwSerial.cpp

@@ -0,0 +1,66 @@
+#include "GwSerial.h"
+class SerialWriter : public GwBufferWriter{
+    private:
+        uart_port_t num;
+    public:
+        SerialWriter(uart_port_t num){
+            this->num=num;
+        }
+        virtual ~SerialWriter(){}
+        virtual int write(const uint8_t *buffer,size_t len){
+            return uart_tx_chars(num,(const char *)buffer,len);
+        }
+
+
+};
+GwSerial::GwSerial(GwLog *logger, uart_port_t num)
+{
+    this->logger = logger;
+    this->num = num;
+    this->buffer = new GwBuffer(logger);
+    this->writer = new SerialWriter(num);
+}
+GwSerial::~GwSerial()
+{
+    delete buffer;
+    delete writer;
+}
+int GwSerial::setup(int baud, int rxpin, int txpin)
+{
+    uart_config_t config = {
+        .baud_rate = baud,
+        .data_bits = UART_DATA_8_BITS,
+        .parity = UART_PARITY_DISABLE,
+        .stop_bits = UART_STOP_BITS_1,
+        .flow_ctrl = UART_HW_FLOWCTRL_DISABLE,
+    };
+    if (uart_driver_install(num, bufferSize, 0, 0, NULL, 0) != ESP_OK)
+    {
+        return -1;
+    }
+    // Configure UART parameters
+    if (uart_param_config(num, &config) != ESP_OK)
+    {
+        return -2;
+    }
+    if (uart_set_pin(num, txpin, rxpin, UART_PIN_NO_CHANGE, UART_PIN_NO_CHANGE) != ESP_OK)
+    {
+        return -3;
+    }
+    buffer->reset();
+    initialized = true;
+    return true;
+}
+bool GwSerial::isInitialized() { return initialized; }
+size_t GwSerial::enqueue(const uint8_t *data, size_t len)
+{
+    return buffer->addData(data, len);
+}
+GwBuffer::WriteStatus GwSerial::write(){
+    return buffer->fetchData(writer,false);
+}
+const char *GwSerial::read(){
+    char buffer[10];
+    uart_read_bytes(num,(uint8_t *)(&buffer),10,0);
+    return NULL;   
+}

lib/serial/GwSerial.h

@@ -0,0 +1,24 @@
+#ifndef _GWSERIAL_H
+#define _GWSERIAL_H
+#include "driver/uart.h"
+#include "GwLog.h"
+#include "GwBuffer.h"
+class SerialWriter;
+class GwSerial{
+    private:
+        GwBuffer *buffer;
+        GwLog *logger; 
+        SerialWriter *writer;
+        uart_port_t num;
+        bool initialized=false;
+    public:
+        static const int bufferSize=200;
+        GwSerial(GwLog *logger,uart_port_t num);
+        ~GwSerial();
+        int setup(int baud,int rxpin,int txpin);
+        bool isInitialized();
+        size_t enqueue(const uint8_t *data, size_t len);
+        GwBuffer::WriteStatus write();
+        const char *read();
+};
+#endif

src/main.cpp

@@ -15,8 +15,6 @@
 #define VERSION "0.1.0"
 #include "GwHardware.h"
 
-#define LOG_SERIAL true
-
 #include <Arduino.h>
 #include <NMEA2000_CAN.h>  // This will automatically choose right CAN library and create suitable NMEA2000 object
 #include <Seasmart.h>
@@ -37,11 +35,12 @@
 #include "GwSocketServer.h"
 #include "GwBoatData.h"
 #include "GwMessage.h"
+#include "GwSerial.h"
 
 typedef std::map<String,String> StringMap;
 
 
-GwLog logger(LOG_SERIAL,GwLog::DEBUG);
+GwLog logger(GwLog::DEBUG,NULL);
 GwConfigHandler config(&logger);
 GwWifi gwWifi(&config,&logger);
 GwSocketServer socketServer(&config,&logger);
@@ -159,6 +158,15 @@ GwConfigInterface *sendTCP=NULL;
 GwConfigInterface *sendSeasmart=NULL;
 GwConfigInterface *systemName=NULL;
 
+GwSerial usbSerial(&logger, UART_NUM_0);
+class GwSerialLog : public GwLogWriter{
+  public:
+    virtual ~GwSerialLog(){}
+    virtual void write(const char *data){
+      usbSerial.enqueue((const uint8_t*)data,strlen(data)); //ignore any errors
+    }
+
+};
 void setup() {
 
   uint8_t chipid[6];
@@ -170,9 +178,20 @@ void setup() {
   if (usbBaud){
     baud=usbBaud->asInt();
   }
-  Serial.begin(baud);
+  int st=usbSerial.setup(baud,3,1); //TODO: PIN defines
-  Serial.println("Starting...");
+  if (st < 0){
-  Serial.println(config.toString());
+    //falling back to old style serial for logging
+    Serial.begin(baud);
+    Serial.printf("fallback serial enabled, error was %d\n",st);
+    logger.prefix="FALLBACK:";
+  }
+  else{
+    GwSerialLog *writer=new GwSerialLog();
+    logger.prefix="GWSERIAL:";
+    logger.setWriter(writer);
+    logger.logDebug(GwLog::LOG,"created GwSerial for USB port");
+  }  
+  logger.logDebug(GwLog::LOG,"config: %s", config.toString().c_str());
   sendUsb=config.getConfigItem(config.sendUsb,true);
   sendTCP=config.getConfigItem(config.sendTCP,true);
   sendSeasmart=config.getConfigItem(config.sendSeasmart,true);
@@ -290,7 +309,7 @@ void setup() {
   });
   webserver.onNotFound(notFound);
   webserver.begin();
-  Serial.println("HTTP server started");
+  logger.logDebug(GwLog::LOG,"HTTP server started");
 
   MDNS.addService("_http","_tcp",80);
 
@@ -325,7 +344,7 @@ void setup() {
   NodeAddress = preferences.getInt("LastNodeAddress", 32);  // Read stored last NodeAddress, default 32
   preferences.end();
 
-  Serial.printf("NodeAddress=%d\n", NodeAddress);
+  logger.logDebug(GwLog::LOG,"NodeAddress=%d\n", NodeAddress);
 
   NMEA2000.SetMode(tNMEA2000::N2km_ListenAndNode, NodeAddress);
 
@@ -369,7 +388,14 @@ void SendNMEA0183Message(const tNMEA0183Msg &NMEA0183Msg) {
     socketServer.sendToClients(buf);
   }
   if (sendUsb->asBoolean()){
-    Serial.println(buf);
+    int len=strlen(buf);
+    if (len >= (MAX_NMEA0183_MESSAGE_SIZE -2)) return;
+    buf[len]=0x0d;
+    len++;
+    buf[len]=0x0a;
+    len++;
+    buf[len]=0;
+    usbSerial.enqueue((const uint8_t*)buf,len);
   }
 }
 
@@ -396,10 +422,9 @@ void loop() {
     msg->process();
     msg->unref();
   }
-
+  if (usbSerial.write() == GwBuffer::ERROR){
-  // Dummy to empty input buffer to avoid board to stuck with e.g. NMEA Reader
+    logger.logDebug(GwLog::DEBUG,"overflow in USB serial");
-  if ( Serial.available() ) {
-    Serial.read();
   }
+  usbSerial.read();
 
 }