added periodic message

fixed buffer length
still some characters get omitted...

src/main.cpp

@@ -16,6 +16,8 @@
 #include "HID-Project.h"
 #include "McuUtility.h"
 
+#define PERIODIC_MESSAGE 0
+
 const int pinLed = 17;
 bool ledState = true;
 
@@ -25,7 +27,7 @@ bool ledState = true;
 // If the data is not read until the host sends the next data
 // it will also respond with an error and the data will be lost.
 uint8_t rawhidData[255];
-uint8_t sendMessageBuffer[60];
+uint8_t sendMessageBuffer[64];
 char receivedMessageBuffer[255];
 uint8_t counter;
 
@@ -48,6 +50,14 @@ void setup() {
 }
 
 void loop() {
+#if PERIODIC_MESSAGE
+  // send periodic message
+  memset(sendMessageBuffer, '\0', sizeof(sendMessageBuffer));  // clear send buffer
+  McuUtility_strcpy((unsigned char*)sendMessageBuffer, sizeof(sendMessageBuffer), (unsigned char*)"periodic message\n");  
+  RawHID.write(sendMessageBuffer, sizeof(sendMessageBuffer));  // send buffer
+  Serial.print((char*)sendMessageBuffer);  // print
+#endif
+
   // Check if there is new data from the RawHID device
   int bytesAvailable = RawHID.available();
   if (bytesAvailable)
@@ -82,6 +92,7 @@ void loop() {
     digitalWrite(pinLed, ledState == true ? HIGH : LOW);
 
     // send response
+    memset(sendMessageBuffer, '\0', sizeof(sendMessageBuffer));  // clear send buffer
     McuUtility_strcpy((unsigned char*)sendMessageBuffer, sizeof(sendMessageBuffer), (unsigned char*)LED_COMMAND_RESPONSE);
     RawHID.write(sendMessageBuffer, sizeof(sendMessageBuffer));
     Serial.print("Sent: '");
@@ -117,6 +128,7 @@ void UsbHidSendLine(unsigned char* str)
   if (str!=NULL) {
     int32_t messageBytes = McuUtility_strlen((char*)str);
     uint8_t bufferSize = sizeof(sendMessageBuffer);
+    uint8_t numBytesPerMessage = bufferSize - 1;  // last byte got omitted always, therefore it is not sent
     Serial.print("Sending message with ");
     Serial.print(messageBytes);
     Serial.print(" bytes and buffer size ");
@@ -124,13 +136,13 @@ void UsbHidSendLine(unsigned char* str)
     Serial.print(": \n'''\n");
 
     // split message in buffer Size amount
-    for(int byteNum = 0; messageBytes > 0; byteNum++){
+    for(int messageNum = 0; messageBytes > 0; messageNum++){
       memset(sendMessageBuffer, '\0', sizeof(sendMessageBuffer));  // clear send buffer
       // copy part of message to send buffer. move pointer by buffer size to take the next part of the string.
-      McuUtility_strcpy((unsigned char*)sendMessageBuffer, sizeof(sendMessageBuffer), (unsigned char*)(str + bufferSize*byteNum));  
+      McuUtility_strcpy((unsigned char*)sendMessageBuffer, numBytesPerMessage, (unsigned char*)(str + (numBytesPerMessage*messageNum)));  
       RawHID.write(sendMessageBuffer, sizeof(sendMessageBuffer));  // write buffer
       Serial.print((char*)sendMessageBuffer);  // print
-      messageBytes -= bufferSize;  // subtract bufferSize from message bytes
+      messageBytes -= numBytesPerMessage;  // subtract numBytes that were sent from message bytes
     }
 
     Serial.print("\n'''\n");