diff --git a/atusb/fw/mac.c b/atusb/fw/mac.c
index d4fd366..d87a063 100644
--- a/atusb/fw/mac.c
+++ b/atusb/fw/mac.c
@@ -113,7 +113,7 @@ static void rx_done(void *user)
 
 static void receive_frame(void)
 {
-	uint8_t size, i;
+	uint8_t size;
 	uint8_t *buf;
 
 	spi_begin();
@@ -128,8 +128,7 @@ static void receive_frame(void)
 	}
 
 	buf = rx_buf[rx_in];
-	for (i = 0; i != size+1; i++)
-		buf[i+1] = spi_recv();
+	spi_recv_block(buf+1, size+1);
 	spi_end();
 
 	buf[0] = size;
diff --git a/atusb/fw/spi.c b/atusb/fw/spi.c
index 91a2de9..ded5673 100644
--- a/atusb/fw/spi.c
+++ b/atusb/fw/spi.c
@@ -47,6 +47,21 @@ void spi_end(void)
 }
 
 
+void spi_recv_block(uint8_t *buf, uint8_t n)
+{
+	if (!n)
+		return;
+        UDR1 = 0;
+	while (--n) {
+		while (!(UCSR1A & 1 << RXC1));
+		*buf++ = UDR1;
+		UDR1 = 0;
+	}
+	while (!(UCSR1A & 1 << RXC1));
+	*buf++ = UDR1;
+}
+
+
 void spi_off(void)
 {
 	spi_initialized = 0;
diff --git a/atusb/fw/spi.h b/atusb/fw/spi.h
index ff9d005..6e04f4e 100644
--- a/atusb/fw/spi.h
+++ b/atusb/fw/spi.h
@@ -1,8 +1,8 @@
 /*
  * fw/spi.h - ATmega8 family SPI I/O
  *
- * Written 2011 by Werner Almesberger
- * Copyright 2011 Werner Almesberger
+ * Written 2011, 2013 by Werner Almesberger
+ * Copyright 2011, 2013 Werner Almesberger
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -25,4 +25,6 @@ void spi_init(void);
 #define	spi_send(v)	(void) spi_io(v)
 #define	spi_recv(v)	spi_io(0)
 
+void spi_recv_block(uint8_t *buf, uint8_t n);
+
 #endif /* !SPI_H */