diff --git a/firmware/funk/nrf24l01p.h b/firmware/funk/nrf24l01p.h
index 9aaae96..42ec5da 100644
--- a/firmware/funk/nrf24l01p.h
+++ b/firmware/funk/nrf24l01p.h
@@ -106,6 +106,7 @@
 
 /* exported functions */
 int nrf_rcv_pkt_time(int maxtime, int maxsize, uint8_t * pkt);
+char nrf_snd_pkt_crc(int size, uint8_t * pkt);
 void nrf_init() ;
 
 void nrf_cmd(uint8_t cmd);
diff --git a/firmware/funk/rftransfer.c b/firmware/funk/rftransfer.c
new file mode 100644
index 0000000..9748f3d
--- /dev/null
+++ b/firmware/funk/rftransfer.c
@@ -0,0 +1,93 @@
+#include "rftransfer.h"
+#include "nrf24l01p.h"
+#include <basic/basic.h>
+#include <core/systick/systick.h>
+
+void rftransfer_send(uint16_t size, uint8_t *data)
+{
+    uint8_t buf[30];
+    buf[0] = 'L';
+    buf[1] = size >> 8;
+    buf[2] = size & 0xFF;
+
+    uint16_t rand = 5; //random_rand16();
+    buf[3] = rand >> 8;
+    buf[4] = rand & 0xFF;
+
+    nrf_snd_pkt_crc(5,buf);     //setup packet
+
+    uint16_t index = 0;
+    uint8_t i;
+    while(size){
+        buf[0] = 'D';
+        buf[1] = index >> 8;
+        buf[2] = index & 0xFF;
+        buf[3] = rand >> 8;
+        buf[4] = rand & 0xFF;
+        for(i=5; i<30 && size>0; i++,size--){
+            buf[i] = *data++;
+        }
+        index++;
+        nrf_snd_pkt_crc(i,buf);     //data packet
+    }
+
+    uint16_t crc = crc16(data,size);
+    buf[0] = 'C';
+    buf[1] = crc >> 8;
+    buf[2] = crc & 0xFF;
+    buf[3] = rand >> 8;
+    buf[4] = rand & 0xFF;
+    nrf_snd_pkt_crc(5,buf);     //crc packet
+}
+
+uint16_t rftransfer_receive(uint8_t *buffer, uint16_t maxlen, uint16_t timeout)
+{
+    uint8_t buf[30];
+    uint8_t state = 0;
+    uint16_t pos = 0, seq = 0, size = 0, rand = 0, crc = 0;
+    int n,i;
+    unsigned int currentTick = systickGetTicks();
+    unsigned int startTick = currentTick;
+    
+    while(currentTick < (startTick+timeout) ){//this fails if either overflows
+        n = nrf_rcv_pkt_time(10, 30, buf);
+        switch(state){
+            case 0:
+                if( n == 5 && buf[0] == 'L' ){
+                    size = (buf[1] << 8) | buf[2];
+                    rand =  (buf[3] << 8) | buf[4];
+                    seq = 0;
+                    pos = 0;
+                    if( size <= maxlen )
+                        state = 1;
+                }
+            break;
+            case 1:
+                if( n > 5 && buf[0] == 'D' && ((buf[3]<<8)|buf[4])==rand ){
+                    if( seq == ((buf[1]<<8)|buf[2]) ){
+                        if( (pos + n - 5)<maxlen ){
+                            for(i=5; i<n; i++,pos++){
+                                buffer[pos] = buf[i];
+                            }
+                        }
+                    }
+                }
+                if( pos == size ){
+                    crc = crc16(buffer, size);
+                    state = 2;
+                }
+            break;
+            case 2:
+                if( n == 5 && buf[0] == 'C' && ((buf[3]<<8)|buf[4])==rand){
+                    if( crc == ((buf[1]<<8)|buf[2]) ){
+                        return size;
+                    }else{
+                        state = 0;
+                    }
+                }
+            break;
+        };
+    }
+    return 0;
+}
+
diff --git a/firmware/funk/rftransfer.h b/firmware/funk/rftransfer.h
new file mode 100644
index 0000000..c616e77
--- /dev/null
+++ b/firmware/funk/rftransfer.h
@@ -0,0 +1,9 @@
+#ifndef _RFTRANSFER_H
+#define _RFTRANSFER_H
+#include <stdint.h>
+
+void rftransfer_send(uint16_t size, uint8_t *data);
+uint16_t rftransfer_receive(uint8_t *buffer, uint16_t maxlen, uint16_t timeout);
+
+
+#endif