diff --git a/firmware/core/ssp/ssp.c b/firmware/core/ssp/ssp.c
index 0dd5ccc..6416134 100644
--- a/firmware/core/ssp/ssp.c
+++ b/firmware/core/ssp/ssp.c
@@ -238,7 +238,7 @@ void sspInit (uint8_t portNum, sspClockPolarity_t polarity, sspClockPhase_t phas
                 Block length of the data buffer
 */
 /**************************************************************************/
-void sspSend (uint8_t portNum, uint8_t *buf, uint32_t length)
+void sspSend (uint8_t portNum, const uint8_t *buf, uint32_t length)
 {
   uint32_t i;
   uint8_t Dummy = Dummy;
diff --git a/firmware/core/ssp/ssp.h b/firmware/core/ssp/ssp.h
index 9ac80f6..b90976f 100644
--- a/firmware/core/ssp/ssp.h
+++ b/firmware/core/ssp/ssp.h
@@ -79,7 +79,7 @@ sspClockPhase_t;
 
 extern void SSP_IRQHandler (void);
 void sspInit (uint8_t portNum, sspClockPolarity_t polarity, sspClockPhase_t phase);
-void sspSend (uint8_t portNum, uint8_t *buf, uint32_t length);
+void sspSend (uint8_t portNum, const uint8_t *buf, uint32_t length);
 void sspReceive (uint8_t portNum, uint8_t *buf, uint32_t length);
 void sspSendReceive(uint8_t portNum, uint8_t *buf, uint32_t length);
 #endif
diff --git a/firmware/funk/nrf24l01p.c b/firmware/funk/nrf24l01p.c
index aa3e9ba..63ee4cf 100644
--- a/firmware/funk/nrf24l01p.c
+++ b/firmware/funk/nrf24l01p.c
@@ -81,7 +81,7 @@ void nrf_read_pkt_crc(int len, uint8_t* data, uint8_t* crc){
     CS_HIGH();
 };
 
-void nrf_write_long(const uint8_t cmd, int len, uint8_t* data){
+void nrf_write_long(const uint8_t cmd, int len, const uint8_t* data){
     CS_LOW();
     xmit_spi(cmd);
     sspSend(0,data,len);
@@ -185,7 +185,7 @@ char nrf_snd_pkt_crc_encr(int size, uint8_t * pkt, uint32_t const key[4]){
     return nrf_cmd_status(C_NOP);
 };
 
-void nrf_set_rx_mac(int pipe, int rxlen, int maclen, uint8_t * mac){
+void nrf_set_rx_mac(int pipe, int rxlen, int maclen, const uint8_t * mac){
 #ifdef SAFE
     assert(maclen>=1 || maclen<=5);
     assert(rxlen>=1 || rxlen<=32);
@@ -202,7 +202,7 @@ void nrf_set_rx_mac(int pipe, int rxlen, int maclen, uint8_t * mac){
             );
 };
 
-void nrf_set_tx_mac(int maclen, uint8_t * mac){
+void nrf_set_tx_mac(int maclen, const uint8_t * mac){
 #ifdef SAFE
     assert(maclen>=1 || maclen<=5);
     assert(mac!=NULL);
diff --git a/firmware/funk/nrf24l01p.h b/firmware/funk/nrf24l01p.h
index a82197f..f9522b6 100644
--- a/firmware/funk/nrf24l01p.h
+++ b/firmware/funk/nrf24l01p.h
@@ -145,10 +145,10 @@ void nrf_cmd_rw_long(uint8_t* data, int len);
 void nrf_read_long(const uint8_t reg, int len, uint8_t* data);
 void nrf_write_reg(const uint8_t reg, const uint8_t val);
 uint8_t nrf_read_reg(const uint8_t reg);
-void nrf_write_reg_long(const uint8_t reg, int len, uint8_t* data);
+void nrf_write_long(const uint8_t cmd, int len, const uint8_t* data);
 
-void nrf_set_rx_mac(int pipe, int rxlen, int maclen, uint8_t * mac);
-void nrf_set_tx_mac(int maclen, uint8_t * mac);
+void nrf_set_rx_mac(int pipe, int rxlen, int maclen, const uint8_t * mac);
+void nrf_set_tx_mac(int maclen, const uint8_t * mac);
 void nrf_disable_pipe(int pipe);
 void nrf_set_channel(int channel);