#pragma once
#include <stdint.h>

/*
 * Hardware register bitfield unions for nRF52840 peripherals.
 * Layout is guaranteed correct only with arm-none-eabi-gcc (LSB-first bitfields).
 * Bit ranges match nRF52840 Product Specification v1.7.
 */

/* GPIOTE */

/* CONFIG[n]: channel configuration */
typedef union {
    struct {
        uint32_t MODE     : 2;   /* [1:0]   0=Disabled  1=Event  3=Task */
        uint32_t          : 6;   /* [7:2]   reserved */
        uint32_t PSEL     : 5;   /* [12:8]  pin number within port */
        uint32_t PORT     : 1;   /* [13]    0=Port0  1=Port1 */
        uint32_t          : 2;   /* [15:14] reserved */
        uint32_t POLARITY : 2;   /* [17:16] 0=None  1=LoToHi  2=HiToLo  3=Toggle */
        uint32_t          : 2;   /* [19:18] reserved */
        uint32_t OUTINIT  : 1;   /* [20]    initial output value for Task mode */
        uint32_t          : 11;  /* [31:21] reserved */
    } bit;
    uint32_t reg;
} gpiote_config_t;

#define GPIOTE_MODE_DISABLED  0u
#define GPIOTE_MODE_EVENT     1u
#define GPIOTE_MODE_TASK      3u
#define GPIOTE_POL_NONE       0u
#define GPIOTE_POL_LOTOHI     1u
#define GPIOTE_POL_HITOLO     2u
#define GPIOTE_POL_TOGGLE     3u

/* INTENSET / INTENCLR: interrupt enable */
typedef union {
    struct {
        uint32_t IN0  : 1;   /* [0]    channel 0 input event */
        uint32_t IN1  : 1;   /* [1]    channel 1 input event */
        uint32_t IN2  : 1;   /* [2] */
        uint32_t IN3  : 1;   /* [3] */
        uint32_t IN4  : 1;   /* [4] */
        uint32_t IN5  : 1;   /* [5] */
        uint32_t IN6  : 1;   /* [6] */
        uint32_t IN7  : 1;   /* [7] */
        uint32_t      : 23;  /* [30:8]  reserved */
        uint32_t PORT : 1;   /* [31]    PORT event */
    } bit;
    uint32_t reg;
} gpiote_inten_t;

/* RADIO */

/* FREQUENCY: radio channel */
typedef union {
    struct {
        uint32_t FREQUENCY : 7;   /* [6:0]  offset from base frequency in MHz */
        uint32_t           : 1;   /* [7]    reserved */
        uint32_t MAP       : 1;   /* [8]    0: base=2400 MHz  1: base=2360 MHz */
        uint32_t           : 23;  /* [31:9] reserved */
    } bit;
    uint32_t reg;
} radio_frequency_t;

#define RADIO_MAP_DEFAULT 0u   /* channel n -> 2400+n MHz */
#define RADIO_MAP_BLE     1u   /* channel n -> 2360+n MHz */

/* TXPOWER: transmit power */
typedef union {
    struct {
        int32_t TXPOWER : 8;   /* [7:0]  signed dBm: +8, +7, +6, +5, +4, +3, +2,
                                          0, -4, -8, -12, -16, -20, -40 */
        uint32_t        : 24;  /* [31:8] reserved */
    } bit;
    uint32_t reg;
} radio_txpower_t;

/* MODE: radio data rate and modulation */
typedef union {
    struct {
        uint32_t MODE : 4;   /* [3:0]  0=NRF_1Mbit  1=NRF_2Mbit  4=BLE_1Mbit ... */
        uint32_t      : 28;  /* [31:4] reserved */
    } bit;
    uint32_t reg;
} radio_mode_t;

#define RADIO_MODE_NRF_1MBIT  0u
#define RADIO_MODE_NRF_2MBIT  1u
#define RADIO_MODE_BLE_1MBIT  4u