#pragma once

// DI registers (32-bit)
#define DI_SR            0x0C006000     // Status Register
#define DI_CVR           0x0C006004     // Cover Register
#define DI_CMDBUF0       0x0C006008     // Command Buffer 0
#define DI_CMDBUF1       0x0C00600C     // Command Buffer 1
#define DI_CMDBUF2       0x0C006010     // Command Buffer 2
#define DI_MAR           0x0C006014     // DMA Memory Address Register
#define DI_LEN           0x0C006018     // DMA Transfer Length Register
#define DI_CR            0x0C00601C     // Control Register
#define DI_IMMBUF        0x0C006020     // Immediate Data Buffer
#define DI_CFG           0x0C006024     // Configuration Register

#define DISR             di.sr
#define DICVR            di.cvr
#define DIMAR            di.mar
#define DILEN            di.len
#define DICR             di.cr

// DI Status Register mask
#define DI_SR_BRKINT     (1 << 6)
#define DI_SR_BRKINTMSK  (1 << 5)
#define DI_SR_TCINT      (1 << 4)
#define DI_SR_TCINTMSK   (1 << 3)
#define DI_SR_DEINT      (1 << 2)
#define DI_SR_DEINTMSK   (1 << 1)
#define DI_SR_BRK        (1 << 0)

// DI Cover Register mask
#define DI_CVR_CVRINT    (1 << 2)
#define DI_CVR_CVRINTMSK (1 << 1)
#define DI_CVR_CVR       (1 << 0)           // 0 = Cover is closed, 1 = Cover is open

// DI Control Register mask
#define DI_CR_RW         (1 << 2)           // 0 = Read Command (DDU->Host), 1 = Write Command (Host->DDU)
#define DI_CR_DMA        (1 << 1)           // 0 = Immediate Mode, 1 = DMA Mode
#define DI_CR_TSTART     (1 << 0)

#define DI_DIMAR_MASK    0x03fffffe0        // Valid bits of DIMAR

// ---------------------------------------------------------------------------
// hardware API

// DI state (registers and other data)
struct DIControl
{
    volatile uint32_t        sr, cvr, cr;    // DI registers
    volatile uint32_t        mar, len;
    volatile uint8_t         cmdbuf[12];
    volatile uint8_t         immbuf[4];
    volatile uint32_t        cfg;
    uint8_t         dmaFifo[32];

    int             dduToHostByteCounter;
    int             hostToDduByteCounter;

    bool            log;
};

extern  DIControl di;

void    DIOpen();
void    DIClose();