diff --git a/Libraries/Si446x/si446x.h b/Libraries/Si446x/si446x.h
new file mode 100644
--- /dev/null
+++ b/Libraries/Si446x/si446x.h
@@ -0,0 +1,176 @@
+#ifndef SI446X_H
+#define SI446X_H
+
+#include "stm32f0xx_hal.h"
+
+
+// Hardware Options ///////////////////
+
+// Timeout for blocking writes
+#define SI446x_TIMEOUT 10
+
+// Crystal/oscillator frequency
+#define SI446x_VCXO_FREQ  26000000UL
+#define SI446x_SPI SPI1
+
+// GPIO assignments
+#define SI446x_CS_PORT GPIOA
+#define SI446x_CS_PIN GPIO_PIN_15
+
+#define SI446x_GPIO_PORT GPIOA
+#define SI446x_GPIO_PIN GPIO_PIN_10
+
+#define SI446x_SHUTDOWN_PORT GPIOA
+#define SI446x_SHUTDOWN_PIN GPIO_PIN_9
+
+#define SI446x_MOSI_PORT GPIOB
+#define SI446x_MOSI_PIN GPIO_PIN_5
+
+#define SI446x_MISO_PORT GPIOB
+#define SI446x_MISO_PIN GPIO_PIN_4
+
+#define SI446x_SCK_PORT GPIOB
+#define SI446x_SCK_PIN GPIO_PIN_3
+
+
+#define SI446x_TCXO_EN_PORT GPIOA
+#define SI446x_TCXO_EN_PIN GPIO_PIN_8
+
+
+///////////////////////////////////////
+
+
+// Registers /////////////////////////
+#define SI446x_CMD_POWER_UP 0x02
+#define SI446x_CMD_NOP 0x00
+#define SI446x_CMD_PART_INFO 0x01
+#define SI446x_CMD_FUNC_INFO 0x10
+#define SI446x_CMD_SET_PROPERTY 0x11
+#define SI446x_CMD_GET_PROPERTY 0x12
+#define SI446x_CMD_GPIO_PIN_CFG 0x13
+#define SI446x_CMD_GET_ADC_READING 0x14
+#define SI446x_CMD_FIFO_INFO 0x15
+#define SI446x_CMD_PACKET_INFO 0x16
+#define SI446x_CMD_IRCAL 0x17
+#define SI446x_CMD_PROTOCOL_CFG 0x18
+#define SI446x_CMD_GET_INT_STATUS 0x20
+#define SI446x_CMD_GET_PH_STATUS 0x21
+#define SI446x_CMD_GET_MODEM_STATUS 0x22
+#define SI446x_CMD_GET_CHIP_STATUS 0x23
+#define SI446x_CMD_START_TX 0x31
+#define SI446x_CMD_START_RX 0x32
+#define SI446x_CMD_REQUEST_DEVICE_STATE 0x33
+#define SI446x_CMD_CHANGE_STATE 0x34
+#define SI446x_CMD_READ_CMD_BUFF 0x44
+#define SI446x_CMD_FRR_A_READ 0x50
+#define SI446x_CMD_FRR_B_READ 0x51
+#define SI446x_CMD_FRR_C_READ 0x53
+#define SI446x_CMD_FRR_D_READ 0x57
+#define SI446x_CMD_WRITE_TX_FIFO 0x66
+#define SI446x_CMD_READ_RX_FIFO 0x77
+#define SI446x_CMD_RX_HOP 0x36
+
+// GPIO pin configuration options
+#define SI446x_GPIO_NOCHANGE 0
+#define SI446x_GPIO_LOW 2
+#define SI446x_GPIO_HIGH 3
+#define SI446x_GPIO_INPUT 4
+#define SI446x_GPIO_TXFIFO_LOW 35
+#define SI446x_GPIO_TXENABLED 32
+
+// GPIO pin definitions
+#define SI446x_GPIO0 0
+#define SI446x_GPIO1 1
+#define SI446x_GPIO2 2
+#define SI446x_GPIO3 3
+
+// Property MOD_TYPE parameters
+#define SI446x_MOD_TYPE_REGISTER_GROUP 0x20
+#define SI446x_MOD_TYPE_REGISTER_PROP 0x00
+#define SI446x_MOD_TYPE_CW    0
+#define SI446x_MOD_TYPE_OOK   1
+#define SI446x_MOD_TYPE_2FSK  2
+#define SI446x_MOD_TYPE_2GFSK 3
+#define SI446x_MOD_TYPE_4FSK  4
+#define SI446x_MOD_TYPE_4GFSK 5
+
+#define SI446x_MOD_TYPE_SOURCE_PACKETHANDLER (0<<3)
+#define SI446x_MOD_TYPE_SOURCE_DIRECTMODE    (1<<3)
+#define SI446x_MOD_TYPE_SOURCE_PSEUDORANDOM  (2<<3)
+
+#define SI446x_MOD_TYPE_DIRECT_SYNCH (0<<7)
+#define SI446x_MOD_TYPE_DIRECT_ASYNCH (1<<7)
+
+#define SI446x_MOD_TYPE_DIRECT_SOURCE_GPIO0 (0<<5)
+#define SI446x_MOD_TYPE_DIRECT_SOURCE_GPIO1 (1<<5)
+#define SI446x_MOD_TYPE_DIRECT_SOURCE_GPIO2 (2<<5)
+#define SI446x_MOD_TYPE_DIRECT_SOURCE_GPIO3 (3<<5)
+
+// XO Tune
+#define SI446x_XO_TUNE_REGISTER_GROUP 0x00
+#define SI446x_XO_TUNE_REGISTER_PROP 0x00
+#define SI446x_XO_TUNE_MAX 0x7F
+
+// Modem bit mapping
+#define SI446x_MODEM_MAP_GROUP 0x20
+#define SI446x_MODEM_MAP_PROP 0x01
+
+// Preamble
+#define SI446x_PREAMBLE_TX_LENGTH_GROUP 0x10
+#define SI446x_PREAMBLE_TX_LENGTH_PROP 0x00
+
+// Sync
+#define SI446x_SYNC_LENGTH_GROUP 0x11
+#define SI446x_SYNC_LENGTH_PROP 0x00
+
+
+// Power amp control DAC options
+#define AD56XX_NORMAL_OPERATION 0b00000000
+#define AD56XX_1K_TO_GROUND     0b01000000
+#define AD56XX_100K_TO_GROUND   0b10000000
+#define AD56XX_TRI_STATE        0b11000000
+
+
+
+// Internal definitions
+#define SI446x_CS SI446x_CS_PORT, SI446x_CS_PIN
+#define SI446x_MOSI SI446x_MOSI_PORT, SI446x_MOSI_PIN
+#define SI446x_MISO SI446x_MISO_PORT, SI446x_MISO_PIN
+#define SI446x_SCK SI446x_SCK_PORT, SI446x_SCK_PIN
+#define SI446x_GPIO SI446x_GPIO_PORT, SI446x_GPIO_PIN
+#define SI446x_SHUTDOWN SI446x_SHUTDOWN_PORT , SI446x_SHUTDOWN_PIN
+
+
+// Communication options
+#define SI446x_IGNORE_ACK 0
+#define SI446x_CHECK_ACK 1
+
+
+// Helper macros
+#define SI446x_SELECT HAL_GPIO_WritePin(SI446x_CS, GPIO_PIN_RESET)
+#define SI446x_DESELECT HAL_GPIO_WritePin(SI446x_CS, GPIO_PIN_SET)
+
+void si446x_init(void);
+
+void si446x_reset(void);
+
+void si446x_gpio(uint8_t gpio, uint8_t state, uint8_t doack);
+
+void si446x_setdatarate(void);
+
+void si446x_senddata(uint8_t* data, uint8_t len);
+void si446x_sendcmd(uint8_t tx_len, uint8_t* data, uint8_t doack);
+
+
+void si446x_setchannel(uint32_t frequency);
+
+void si446x_cw_on(void);
+void si446x_cw_off(void);
+uint8_t si446x_tx_status(void);
+
+SPI_HandleTypeDef* spi1_get(void);
+
+void si446x_shutdown(void);
+void si446x_wakeup(void);
+
+#endif