refactor a little, add function for clearing buffer

src/LCDDisplay.cpp

@@ -29,7 +29,7 @@ LCDDisplay::LCDDisplay(std::string dev, uint32_t baud) {
     tcflush(lcd, TCIFLUSH);
     tcsetattr(lcd, TCSANOW, &term);
     _lcd = lcd;
-    std::memset(linebuf, ' ', sizeof(linebuf));  // init linebuf to spaces
+    clearBuf();  // init linebuf to spaces
 }
 
 LCDDisplay::~LCDDisplay() {
@@ -84,8 +84,12 @@ void LCDDisplay::writeBuf(uint8_t row, uint8_t col, std::string str) {
     std::memcpy(&linebuf[row][col], str.c_str(), len);  // will overflow
 }
 
+void LCDDisplay::clearBuf() {
+    std::memset(linebuf, ' ', sizeof(linebuf));
+}
+
 /* hyper optimized buffer flush command, writes whole disp with a single write */
-void LCDDisplay::flushBuffer() {
+void LCDDisplay::flushBuf() {
     char writebuf[168]; // 4x40 chars + 2x4 setcursor commands
     uint8_t setDisp[] = {254, 71, 1}; // skeleton set cursor command