bug fixed usbPutByteToRxBuffer

src/USBLib/usb.c

@@ -55,12 +55,15 @@ void usbWriteString(const uint8_t str[]) {
 
  // reads all available characters from USB and returns them as a string
 void usbReadString(uint8_t str[]) {
+	uint8_t status = SREG;		// make atomic
+	cli();
 	while (rxBuf.len > 0) {
 		*str++ = rxBuf.buf[rxBuf.out];
 		rxBuf.out = (rxBuf.out + 1) % rxBufLen;
 		rxBuf.len--;
 	}
 	*str = 0; // terminate the string
+	SREG = status;
 }
 
 uint16_t usbGetAvailableTransmit() {
@@ -80,7 +83,7 @@ uint16_t usbGetAvailableReceive() {
 
 void usbPutByteToRxBuffer(uint8_t ch) {
 	if (rxBuf.len < rxBufLen) {
-		rxBuf.buf[(rxBuf.out + rxBuf.len) % txBufLen] = ch;
+		rxBuf.buf[(rxBuf.out + rxBuf.len) % rxBufLen] = ch;
 		rxBuf.len++;
 	}
 }