//EN_RXADDR register bitwise definitions
#define nrf24l01_EN_RXADDR_RESERVED	0xC0
#define nrf24l01_EN_RXADDR_ERX_ALL	0x3F
#define nrf24l01_EN_RXADDR_ERX_P5	0x20
#define nrf24l01_EN_RXADDR_ERX_P4	0x10
#define nrf24l01_EN_RXADDR_ERX_P3	0x08
#define nrf24l01_EN_RXADDR_ERX_P2	0x04
#define nrf24l01_EN_RXADDR_ERX_P1	0x02
#define nrf24l01_EN_RXADDR_ERX_P0	0x01
#define nrf24l01_EN_RXADDR_ERX_NONE	0x00

//SETUP_AW register bitwise definitions
#define nrf24l01_SETUP_AW_RESERVED	0xFC
#define nrf24l01_SETUP_AW			0x03
#define nrf24l01_SETUP_AW_5BYTES	0x03
#define nrf24l01_SETUP_AW_4BYTES	0x02
#define nrf24l01_SETUP_AW_3BYTES	0x01
#define nrf24l01_SETUP_AW_ILLEGAL	0x00

//SETUP_RETR register bitwise definitions
#define nrf24l01_SETUP_RETR_ARD			0xF0
#define nrf24l01_SETUP_RETR_ARD_4000	0xF0
#define nrf24l01_SETUP_RETR_ARD_3750	0xE0
#define nrf24l01_SETUP_RETR_ARD_3500	0xD0
#define nrf24l01_SETUP_RETR_ARD_3250	0xC0
#define nrf24l01_SETUP_RETR_ARD_3000	0xB0
#define nrf24l01_SETUP_RETR_ARD_2750	0xA0
#define nrf24l01_SETUP_RETR_ARD_2500	0x90
#define nrf24l01_SETUP_RETR_ARD_2250	0x80
#define nrf24l01_SETUP_RETR_ARD_2000	0x70
#define nrf24l01_SETUP_RETR_ARD_1750	0x60
#define nrf24l01_SETUP_RETR_ARD_1500	0x50
#define nrf24l01_SETUP_RETR_ARD_1250	0x40
#define nrf24l01_SETUP_RETR_ARD_1000	0x30
#define nrf24l01_SETUP_RETR_ARD_750		0x20
#define nrf24l01_SETUP_RETR_ARD_500		0x10
#define nrf24l01_SETUP_RETR_ARD_250		0x00
#define nrf24l01_SETUP_RETR_ARC			0x0F
#define nrf24l01_SETUP_RETR_ARC_15		0x0F
#define nrf24l01_SETUP_RETR_ARC_14		0x0E
#define nrf24l01_SETUP_RETR_ARC_13		0x0D
#define nrf24l01_SETUP_RETR_ARC_12		0x0C
#define nrf24l01_SETUP_RETR_ARC_11		0x0B
#define nrf24l01_SETUP_RETR_ARC_10		0x0A
#define nrf24l01_SETUP_RETR_ARC_9		0x09
#define nrf24l01_SETUP_RETR_ARC_8		0x08
#define nrf24l01_SETUP_RETR_ARC_7		0x07
#define nrf24l01_SETUP_RETR_ARC_6		0x06
#define nrf24l01_SETUP_RETR_ARC_5		0x05
#define nrf24l01_SETUP_RETR_ARC_4		0x04
#define nrf24l01_SETUP_RETR_ARC_3		0x03
#define nrf24l01_SETUP_RETR_ARC_2		0x02
#define nrf24l01_SETUP_RETR_ARC_1		0x01
#define nrf24l01_SETUP_RETR_ARC_0		0x00

//RF_CH register bitwise definitions
#define nrf24l01_RF_CH_RESERVED	0x80

//RF_SETUP register bitwise definitions
#define nrf24l01_RF_SETUP_RESERVED	0xE0
#define nrf24l01_RF_SETUP_PLL_LOCK	0x10
#define nrf24l01_RF_SETUP_RF_DR		0x08
#define nrf24l01_RF_SETUP_RF_PWR	0x06
#define nrf24l01_RF_SETUP_RF_PWR_0	0x06
#define nrf24l01_RF_SETUP_RF_PWR_6 	0x04
#define nrf24l01_RF_SETUP_RF_PWR_12	0x02
#define nrf24l01_RF_SETUP_RF_PWR_18	0x00
#define nrf24l01_RF_SETUP_LNA_HCURR	0x01

//STATUS register bitwise definitions
#define nrf24l01_STATUS_RESERVED					0x80
#define nrf24l01_STATUS_RX_DR						0x40
#define nrf24l01_STATUS_TX_DS						0x20
#define nrf24l01_STATUS_MAX_RT						0x10
#define nrf24l01_STATUS_RX_P_NO						0x0E
#define nrf24l01_STATUS_RX_P_NO_RX_FIFO_NOT_EMPTY	0x0E
#define nrf24l01_STATUS_RX_P_NO_UNUSED				0x0C
#define nrf24l01_STATUS_RX_P_NO_5					0x0A
#define nrf24l01_STATUS_RX_P_NO_4					0x08
#define nrf24l01_STATUS_RX_P_NO_3					0x06
#define nrf24l01_STATUS_RX_P_NO_2					0x04
#define nrf24l01_STATUS_RX_P_NO_1					0x02
#define nrf24l01_STATUS_RX_P_NO_0					0x00
#define nrf24l01_STATUS_TX_FULL						0x01

//OBSERVE_TX register bitwise definitions
#define nrf24l01_OBSERVE_TX_PLOS_CNT	0xF0
#define nrf24l01_OBSERVE_TX_ARC_CNT		0x0F

//CD register bitwise definitions
#define nrf24l01_CD_RESERVED	0xFE
#define nrf24l01_CD_CD			0x01

//RX_PW_P0 register bitwise definitions
#define nrf24l01_RX_PW_P0_RESERVED	0xC0

//RX_PW_P0 register bitwise definitions
#define nrf24l01_RX_PW_P0_RESERVED	0xC0

//RX_PW_P1 register bitwise definitions
#define nrf24l01_RX_PW_P1_RESERVED	0xC0

//RX_PW_P2 register bitwise definitions
#define nrf24l01_RX_PW_P2_RESERVED	0xC0

//RX_PW_P3 register bitwise definitions
#define nrf24l01_RX_PW_P3_RESERVED	0xC0

//RX_PW_P4 register bitwise definitions
#define nrf24l01_RX_PW_P4_RESERVED	0xC0

//RX_PW_P5 register bitwise definitions
#define nrf24l01_RX_PW_P5_RESERVED	0xC0

//FIFO_STATUS register bitwise definitions
#define nrf24l01_FIFO_STATUS_RESERVED	0x8C
#define nrf24l01_FIFO_STATUS_TX_REUSE	0x40
#define nrf24l01_FIFO_STATUS_TX_FULL	0x20
#define nrf24l01_FIFO_STATUS_TX_EMPTY	0x10
#define nrf24l01_FIFO_STATUS_RX_FULL	0x02
#define nrf24l01_FIFO_STATUS_RX_EMPTY	0x01

////////////////////////////////////////////////////////////////////////////////////
// Function declarations
//
// Below are all function definitions contained in the library.  Please see
//   nrf24l01.c for comments regarding the usage of each function.
////////////////////////////////////////////////////////////////////////////////////
//initialization functions
void nrf24l01_initialize(unsigned char config,
						 unsigned char opt_rx_standby_mode, 
						 unsigned char en_aa, 
						 unsigned char en_rxaddr, 
						 unsigned char setup_aw, 
						 unsigned char setup_retr, 
						 unsigned char rf_ch, 
						 unsigned char rf_setup, 
						 unsigned char * rx_addr_p0, 
						 unsigned char * rx_addr_p1, 
						 unsigned char rx_addr_p2, 
						 unsigned char rx_addr_p3, 
						 unsigned char rx_addr_p4, 
						 unsigned char rx_addr_p5, 
						 unsigned char * tx_addr, 
						 unsigned char rx_pw_p0, 
						 unsigned char rx_pw_p1, 
						 unsigned char rx_pw_p2, 
						 unsigned char rx_pw_p3, 
						 unsigned char rx_pw_p4, 
						 unsigned char rx_pw_p5);
void nrf24l01_initialize_debug(bool rx, unsigned char p0_payload_width, bool enable_auto_ack);
void nrf24l01_initialize_debug_lite(bool rx, unsigned char p0_payload_width);

//power-up, power-down functions
void nrf24l01_power_up(bool rx_active_mode);
void nrf24l01_power_up_param(bool rx_active_mode, unsigned char config);
void nrf24l01_power_down();
void nrf24l01_power_down_param(unsigned char config);

//SPI commands defined by the spec
//for regnumber values, see section above titled "register definitions"
//all functions return the STATUS register
unsigned char nrf24l01_write_register(unsigned char regnumber, unsigned char * data, unsigned int len);
unsigned char nrf24l01_read_register(unsigned char regnumber, unsigned char * data, unsigned int len);
unsigned char nrf24l01_write_tx_payload(unsigned char * data, unsigned int len, bool transmit);
unsigned char nrf24l01_read_rx_payload(unsigned char * data, unsigned int len);
unsigned char nrf24l01_flush_tx();
unsigned char nrf24l01_flush_rx();
unsigned char nrf24l01_reuse_tx_pl();
unsigned char nrf24l01_nop();

//RX/TX setting functions
void nrf24l01_set_as_rx(bool rx_active_mode);
void nrf24l01_set_as_rx_param(bool rx_active_mode, unsigned char config);
void nrf24l01_rx_standby_to_active();
void nrf24l01_rx_active_to_standby();
void nrf24l01_set_as_tx();
void nrf24l01_set_as_tx_param(unsigned char config);

//register-oriented get/set functions for commonly-used registers during operation
unsigned char nrf24l01_get_config();
void nrf24l01_set_config(unsigned char config);
unsigned char nrf24l01_get_rf_ch();
void nrf24l01_set_rf_ch(unsigned char channel);
unsigned char nrf24l01_get_status();
unsigned char nrf24l01_get_observe_tx();
void nrf24l01_set_rx_addr(unsigned char * address, unsigned int len, unsigned char rxpipenum);
void nrf24l01_set_tx_addr(unsigned char * address, unsigned int len);
void nrf24l01_set_rx_pw(unsigned char payloadwidth, unsigned char rxpipenum);
unsigned char nrf24l01_get_rx_pw(unsigned char rxpipenum);
unsigned char nrf24l01_get_fifo_status();

//auto-ack and pipe-related functions
bool nrf24l01_aa_enabled(unsigned char rxpipenum);
void nrf24l01_aa_enable(unsigned char rxpipenum);
void nrf24l01_aa_disable(unsigned char rxpipenum);
bool nrf24l01_rx_pipe_enabled(unsigned char rxpipenum);
void nrf24l01_rx_pipe_enable(unsigned char rxpipenum);
void nrf24l01_rx_pipe_disable(unsigned char rxpipenum);
unsigned char nrf24l01_get_plos_cnt();
void nrf24l01_clear_plos_cnt();
void nrf24l01_clear_plos_cnt_param(unsigned char rf_ch);
unsigned char nrf24l01_get_arc_cnt();

//utility functions
bool nrf24l01_cd_active();
void nrf24l01_clear_flush();
unsigned char nrf24l01_get_rx_pipe();
unsigned char nrf24l01_get_rx_pipe_from_status(unsigned char status);
void nrf24l01_get_all_registers(unsigned char * data);

//interrupt check/clear functions
bool nrf24l01_irq_pin_active();
bool nrf24l01_irq_rx_dr_active();
bool nrf24l01_irq_tx_ds_active();
bool nrf24l01_irq_max_rt_active();
void nrf24l01_irq_clear_all();
void nrf24l01_irq_clear_rx_dr();
void nrf24l01_irq_clear_tx_ds();
void nrf24l01_irq_clear_max_rt();

//FIFO_STATUS check functions
bool nrf24l01_fifo_tx_reuse();
bool nrf24l01_fifo_tx_full();
bool nrf24l01_fifo_tx_empty();
bool nrf24l01_fifo_rx_full();
bool nrf24l01_fifo_rx_empty();

//IO interface-related functions
void nrf24l01_transmit();
void nrf24l01_clear_ce();
void nrf24l01_set_ce();
void nrf24l01_clear_csn();
void nrf24l01_set_csn();
bool nrf24l01_ce_pin_active();
bool nrf24l01_csn_pin_active();

//low-level functions for library use only
unsigned char nrf24l01_execute_command(unsigned char instruction, unsigned char * data, unsigned int len, bool copydata);
void nrf24l01_spi_send_read(unsigned char * data, unsigned int len, bool copydata);

#endif /*NRF24L01_H_*/
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