diff --git a/include/sx127x.h b/include/sx127x.h
index 9e772d7..913a02b 100644
--- a/include/sx127x.h
+++ b/include/sx127x.h
@@ -602,7 +602,7 @@ void sx127x_tx_set_callback(void (*tx_callback)(sx127x *), sx127x *device);
  *         - SX127X_ERR_INVALID_ARG   if parameter is invalid
  *         - SX127X_OK                on success
  */
-int sx127x_lora_tx_set_for_transmission(uint8_t *data, uint8_t data_length, sx127x *device);
+int sx127x_lora_tx_set_for_transmission(const uint8_t *data, uint8_t data_length, sx127x *device);
 
 /**
  * @brief Write packet into sx127x's FIFO for transmittion. Once packet is written, set opmod to TX.
diff --git a/include/sx127x_spi.h b/include/sx127x_spi.h
index 978fa4c..ff57166 100644
--- a/include/sx127x_spi.h
+++ b/include/sx127x_spi.h
@@ -58,7 +58,7 @@ int sx127x_spi_read_buffer(int reg, uint8_t *buffer, size_t buffer_length, void
  *         - SX127X_ERR_INVALID_ARG   if parameter is invalid
  *         - SX127X_OK                on success
  */
-int sx127x_spi_write_register(int reg, uint8_t *data, size_t data_length, void *spi_device);
+int sx127x_spi_write_register(int reg, const uint8_t *data, size_t data_length, void *spi_device);
 
 /**
  * @brief Write data_length bytes into the register
@@ -71,7 +71,7 @@ int sx127x_spi_write_register(int reg, uint8_t *data, size_t data_length, void *
  *         - SX127X_ERR_INVALID_ARG   if parameter is invalid
  *         - SX127X_OK                on success
  */
-int sx127x_spi_write_buffer(int reg, uint8_t *buffer, size_t buffer_length, void *spi_device);
+int sx127x_spi_write_buffer(int reg, const uint8_t *buffer, size_t buffer_length, void *spi_device);
 
 #ifdef __cplusplus
 }
diff --git a/src/sx127x.c b/src/sx127x.c
index 38a74e3..c839ad7 100644
--- a/src/sx127x.c
+++ b/src/sx127x.c
@@ -837,7 +837,7 @@ int sx127x_lora_tx_set_explicit_header(sx127x_tx_header_t *header, sx127x *devic
   return sx127x_append_register(REG_MODEM_CONFIG_2, value, 0b11111011, device->spi_device);
 }
 
-int sx127x_lora_tx_set_for_transmission(uint8_t *data, uint8_t data_length, sx127x *device) {
+int sx127x_lora_tx_set_for_transmission(const uint8_t *data, uint8_t data_length, sx127x *device) {
   CHECK_MODULATION(device, SX127x_MODULATION_LORA);
   // uint8_t can't be more than MAX_PACKET_SIZE
   if (data_length == 0) {
diff --git a/src/sx127x_esp_spi.c b/src/sx127x_esp_spi.c
index a5e0798..a648e81 100644
--- a/src/sx127x_esp_spi.c
+++ b/src/sx127x_esp_spi.c
@@ -48,7 +48,7 @@ int sx127x_spi_read_buffer(int reg, uint8_t *buffer, size_t buffer_length, void
   return spi_device_polling_transmit(spi_device, &t);
 }
 
-int sx127x_spi_write_register(int reg, uint8_t *data, size_t data_length, void *spi_device) {
+int sx127x_spi_write_register(int reg, const uint8_t *data, size_t data_length, void *spi_device) {
   if (data_length == 0 || data_length > 4) {
     return ESP_ERR_INVALID_ARG;
   }
@@ -65,7 +65,7 @@ int sx127x_spi_write_register(int reg, uint8_t *data, size_t data_length, void *
   return spi_device_polling_transmit(spi_device, &t);
 }
 
-int sx127x_spi_write_buffer(int reg, uint8_t *buffer, size_t buffer_length, void *spi_device) {
+int sx127x_spi_write_buffer(int reg, const uint8_t *buffer, size_t buffer_length, void *spi_device) {
   spi_transaction_t t = {
       .addr = reg | 0x80,
       .rx_buffer = NULL,
diff --git a/src/sx127x_linux_spi.c b/src/sx127x_linux_spi.c
index 1de595f..c7b4c0f 100644
--- a/src/sx127x_linux_spi.c
+++ b/src/sx127x_linux_spi.c
@@ -52,7 +52,7 @@ int sx127x_spi_read_buffer(int reg, uint8_t *buffer, size_t buffer_length, void
   return 0;
 }
 
-int sx127x_spi_write_register(int reg, uint8_t *data, size_t data_length, void *spi_device) {
+int sx127x_spi_write_register(int reg, const uint8_t *data, size_t data_length, void *spi_device) {
   struct spi_ioc_transfer tr[2];
   memset(&tr, 0, sizeof(tr));
   reg = reg | 0x80;
@@ -67,7 +67,7 @@ int sx127x_spi_write_register(int reg, uint8_t *data, size_t data_length, void *
   return 0;
 }
 
-int sx127x_spi_write_buffer(int reg, uint8_t *buffer, size_t buffer_length, void *spi_device) {
+int sx127x_spi_write_buffer(int reg, const uint8_t *buffer, size_t buffer_length, void *spi_device) {
   struct spi_ioc_transfer tr[2];
   memset(&tr, 0, sizeof(tr));
   reg = reg | 0x80;