Nsysccr.rpl

nsysccr is Nintendo System CCR which interfaces with the IOS-PAD part of IOSU through various /dev nodes. See the IOSU wiki page for a list.

Reverse Engineered (Pseudo)Code

CCR - Misc. Gamepad

#define CCR_CDC_Handle 0x10000618
#define CCR_IPCBufPool 0x10000620

#define CCR_ERROR_BASE 0xFFEE0000
#define CCR_ERROR_NO_BUFPOOL (CCR_ERROR_BASE + 2)

int CCR_IPCBufPoolAllocate(void) //020038AC
{
    return IPCBufPoolAllocate(&CCR_IPCBufPool, 0x3A4);
}

void CCR_IPCBufPoolFree(int handle) //020038BC
{
    return IPCBufPoolFree(&CCR_IPCBufPool, handle);
}

int CCREnableDrhCheck(int value) //02002D14
{
    int handle = CCR_IPCBufPoolAllocate();
    if (!handle)
        return CCR_ERROR_NO_BUFPOOL;
    handle[0] = value;
    handle[0x80/4] = handle;
    handle[0x84/4] = 4;
    int ret = IOS_Ioctlv(&CCR_CDC_Handle, 0x385, 1, 0, handle + 0x80);
    CCR_IPCBufPoolFree(handle);
    return ret;
}

int CCREnablePowerButton(int value) //02002D9C
{
    int handle = CCR_IPCBufPoolAllocate();
    if (!handle)
        return CCR_ERROR_NO_BUFPOOL;
    handle[0] = value;
    handle[0x80/4] = handle;
    handle[0x84/4] = 4;
    int ret = IOS_Ioctlv(&CCR_CDC_Handle, 0x386, 1, 0, handle + 0x80);
    CCR_IPCBufPoolFree(handle);
    return ret;
}

int CCRSetCompatMode(int value) //02002E24
{
    int handle = CCR_IPCBufPoolAllocate();
    if (!handle)
        return CCR_ERROR_NO_BUFPOOL;
    handle[0] = value;
    handle[0x80/4] = handle;
    handle[0x84/4] = 4;
    int ret = IOS_Ioctlv(&CCR_CDC_Handle, 0x387, 1, 0, handle + 0x80);
    CCR_IPCBufPoolFree(handle);
    return ret;
}

void CCREnableFwUpdateMode(void) //020038CC
{
    if(bspWrite("CCRH", 0, "Reset") == 0) //bspWrite in coreinit, interfaces with IOS-BSP
        COSWarn(1, "Successfully reset host and ENabled fw update\n");
    else
        COSWarn(1, "FAILED to reset host and enable fw update\n");
    COSWarn(1, "Wait 3 seconds for HOST to deatach and attach\n"); //Typo in binary
    OSSleepTicks((int64_t)3 * (OSGetSystemInfo()->busClockSpeed / 4));
}

void CCRDisableFwUpdateMode(void) //02003970
{
    if(bspWrite("CCRH", 0, "Reset") == 0) //bspWrite in coreinit, interfaces with IOS-BSP
        COSWarn(1, "Successfully reset host and DISabled fw update\n");
    else
        COSWarn(1, "FAILED to reset host and disable fw update\n");
    COSWarn(1, "Wait 3 seconds for HOST to deatach and attach\n"); //Typo in binary
    OSSleepTicks((int64_t)3 * (OSGetSystemInfo()->busClockSpeed / 4));
}

CCRHID - Gamepad Human Interface Device API

void CCRHIDSetup(void) //02000498
{
    COSInfo(6, "%s() depricated, no need to call\n", "CCRHIDSetup"); //Typo in binary
    return 0;
}

void CCRHIDTeardown(void) //020004D4
{
    COSInfo(6, "%s() depricated, no need to call\n", "CCRHIDTeardown"); //Typo in binary
    return 0;
}

CCRCDC - Gamepad Communications Device Class API

uint16_t CCRCDCCalcCRC16(uint32_t *data, uint32_t size) //02002EAC
{
    uint16_t crc = 0xFFFF;
    if (size > 0)
    {
        for (int j = 0; j < size; j++)
        {
            crc = (uint16_t)(crc ^ data[j]); //load in new byte
            for (int i = 0; i < 8; i++)
            {
                if ((crc & 0x0001) == 1) //if LSB is set, do xor
                    crc = (uint16_t)((crc >> 1) ^ 0x8408);
                else //just cycle 1
                    crc >>= 1;
            }
        }
    }
    return crc;
}