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/* Copyright (C) 2020 Kristian Sloth Lauszus and Dennis Frett. All rights reserved.
This software may be distributed and modified under the terms of the GNU
General Public License version 2 (GPL2) as published by the Free Software
Foundation and appearing in the file GPL2.TXT included in the packaging of
this file. Please note that GPL2 Section 2[b] requires that all works based
on this software must also be made publicly available under the terms of
the GPL2 ("Copyleft").
Contact information
-------------------
Kristian Sloth Lauszus
Web : https://lauszus.com
e-mail : lauszus@gmail.com
Dennis Frett
GitHub : https://github.com/dennisfrett
e-mail : dennis.frett@live.com
*/
#include "MiniDSP.h"
void MiniDSP::ParseHIDData(USBHID *hid __attribute__ ((unused)), bool is_rpt_id __attribute__ ((unused)), uint8_t len, uint8_t *buf) {
constexpr uint8_t StatusInputCommand[] = {0x05, 0xFF, 0xDA};
// Only care about valid data for the MiniDSP 2x4HD.
if(HIDUniversal::VID != MINIDSP_VID || HIDUniversal::PID != MINIDSP_PID || len <= 4 || buf == nullptr)
return;
// Check if this is a status update.
// First byte is the length, we ignore that for now.
if(memcmp(buf + 1, StatusInputCommand, sizeof (StatusInputCommand)) == 0) {
// Parse data.
// Response is of format [ length ] [ 0x05 0xFF 0xDA ] [ volume ] [ muted ].
const auto newVolume = buf[sizeof (StatusInputCommand) + 1];
const auto newIsMuted = (bool)buf[sizeof (StatusInputCommand) + 2];
const auto volumeChanged = newVolume != volume;
const auto mutedChanged = newIsMuted != muted;
// Update status.
volume = newVolume;
muted = newIsMuted;
// Call callbacks.
if(pFuncOnVolumeChange != nullptr && volumeChanged)
pFuncOnVolumeChange(volume);
if(pFuncOnMutedChange != nullptr && mutedChanged)
pFuncOnMutedChange(muted);
}
};
uint8_t MiniDSP::OnInitSuccessful() {
// Verify we're actually connected to the MiniDSP 2x4HD.
if(HIDUniversal::VID != MINIDSP_VID || HIDUniversal::PID != MINIDSP_PID)
return 0;
// Request current status so we can initialize the values.
RequestStatus();
if(pFuncOnInit != nullptr)
pFuncOnInit();
return 0;
};
uint8_t MiniDSP::Checksum(const uint8_t *data, uint8_t data_length) const {
uint16_t sum = 0;
for(uint8_t i = 0; i < data_length; i++)
sum += data[i];
return sum & 0xFF;
}
void MiniDSP::SendCommand(uint8_t *command, uint8_t command_length) const {
// Sanity check on command length.
if(command_length > 63)
return;
// Message is padded to 64 bytes with 0xFF and is of format:
// [ length (command + checksum byte) ] [ command ] [ checksum ] [ OxFF... ]
// MiniDSP expects 64 byte messages.
uint8_t buf[64];
// Set length, including checksum byte.
buf[0] = command_length + 1;
// Copy actual command.
memcpy(&buf[1], command, command_length);
const auto checksumOffset = command_length + 1;
// Set checksum byte.
buf[checksumOffset] = Checksum(buf, command_length + 1);
// Pad the rest.
memset(&buf[checksumOffset + 1], 0xFF, sizeof (buf) - checksumOffset - 1);
pUsb->outTransfer(bAddress, epInfo[epInterruptOutIndex].epAddr, sizeof (buf), buf);
}
void MiniDSP::RequestStatus() const {
uint8_t RequestStatusOutputCommand[] = {0x05, 0xFF, 0xDA, 0x02};
SendCommand(RequestStatusOutputCommand, sizeof (RequestStatusOutputCommand));
}

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/* Copyright (C) 2020 Kristian Sloth Lauszus and Dennis Frett. All rights reserved.
This software may be distributed and modified under the terms of the GNU
General Public License version 2 (GPL2) as published by the Free Software
Foundation and appearing in the file GPL2.TXT included in the packaging of
this file. Please note that GPL2 Section 2[b] requires that all works based
on this software must also be made publicly available under the terms of
the GPL2 ("Copyleft").
Contact information
-------------------
Kristian Sloth Lauszus
Web : https://lauszus.com
e-mail : lauszus@gmail.com
Dennis Frett
GitHub : https://github.com/dennisfrett
e-mail : dennis.frett@live.com
*/
#pragma once
#include "hiduniversal.h"
#define MINIDSP_VID 0x2752 // MiniDSP
#define MINIDSP_PID 0x0011 // MiniDSP 2x4HD
/**
* Arduino MiniDSP 2x4HD USB Host Driver by Dennis Frett.
*
* This class implements support for the MiniDSP 2x4HD via USB.
* Based on NodeJS implementation by Mathieu Rene:
* https://github.com/mrene/node-minidsp and the Python implementation by Mark
* Kubiak: https://github.com/markubiak/python3-minidsp.
*
* It uses the HIDUniversal class for all the USB communication.
*/
class MiniDSP : public HIDUniversal {
public:
/**
* Constructor for the MiniDSP class.
* @param p Pointer to the USB class instance.
*/
MiniDSP(USB *p) : HIDUniversal(p) {
};
/**
* Used to check if a MiniDSP 2x4HD is connected.
* @return Returns true if it is connected.
*/
bool connected() {
return HIDUniversal::isReady() && HIDUniversal::VID == MINIDSP_VID && HIDUniversal::PID == MINIDSP_PID;
};
/**
* Used to call your own function when the device is successfully
* initialized.
* @param funcOnInit Function to call.
*/
void attachOnInit(void (*funcOnInit)(void)) {
pFuncOnInit = funcOnInit;
};
/**
* Used to call your own function when the volume has changed.
* The volume is passed as an unsigned integer that represents twice the
* -dB value. Example: 19 represents -9.5dB.
* @param funcOnVolumeChange Function to call.
*/
void attachOnVolumeChange(void (*funcOnVolumeChange)(uint8_t)) {
pFuncOnVolumeChange = funcOnVolumeChange;
}
/**
* Used to call your own function when the muted status has changed.
* The muted status is passed as a boolean. True means muted, false
* means unmuted.
* @param funcOnMutedChange Function to call.
*/
void attachOnMutedChange(void (*funcOnMutedChange)(bool)) {
pFuncOnMutedChange = funcOnMutedChange;
}
/**
* Retrieve the current volume of the MiniDSP.
* The volume is passed as an unsigned integer that represents twice the
* -dB value. Example: 19 represents -9.5dB.
* @return Current volume.
*/
int getVolume() const {
return volume;
}
/**
* Retrieve the current volume of the MiniDSP in -dB.
* @return Current volume.
*/
float getVolumeDB() const {
return volume / -2.0;
}
/**
* Retrieve the current muted status of the MiniDSP
* @return `true` if the device is muted, `false` otherwise.
*/
bool isMuted() const {
return muted;
}
protected:
/** @name HIDUniversal implementation */
/**
* Used to parse USB HID data.
* @param hid Pointer to the HID class.
* @param is_rpt_id Only used for Hubs.
* @param len The length of the incoming data.
* @param buf Pointer to the data buffer.
*/
void ParseHIDData(USBHID *hid, bool is_rpt_id, uint8_t len, uint8_t *buf);
/**
* Called when a device is successfully initialized.
* Use attachOnInit(void (*funcOnInit)(void)) to call your own function.
* This is useful for instance if you want to set the LEDs in a specific
* way.
*/
uint8_t OnInitSuccessful();
/**@}*/
/** @name USBDeviceConfig implementation */
/**
* Used by the USB core to check what this driver support.
* @param vid The device's VID.
* @param pid The device's PID.
* @return Returns true if the device's VID and PID matches this
* driver.
*/
virtual bool VIDPIDOK(uint16_t vid, uint16_t pid) {
return vid == MINIDSP_VID && pid == MINIDSP_PID;
};
/**@}*/
private:
/**
* Calculate checksum for given buffer.
* Checksum is given by summing up all bytes in `data` and returning the first byte.
* @param data Buffer to calculate checksum for.
* @param data_length Length of the buffer.
*/
uint8_t Checksum(const uint8_t *data, uint8_t data_length) const;
/**
* Send the "Request status" command to the MiniDSP. The response
* includes the current volume and the muted status.
*/
void
RequestStatus() const;
/**
* Send the given MiniDSP command. This function will create a buffer
* with the expected header and checksum and send it to the MiniDSP.
* Responses will come in throug `ParseHIDData`.
* @param command Buffer of the command to send.
* @param command_length Length of the buffer.
*/
void SendCommand(uint8_t *command, uint8_t command_length) const;
// Callbacks
// Pointer to function called in onInit().
void (*pFuncOnInit)(void) = nullptr;
// Pointer to function called when volume changes.
void (*pFuncOnVolumeChange)(uint8_t) = nullptr;
// Pointer to function called when muted status changes.
void (*pFuncOnMutedChange)(bool) = nullptr;
// -----------------------------------------------------------------------------
// MiniDSP state. Currently only volume and muted status are
// implemented, but others can be added easily if needed.
// The volume is stored as an unsigned integer that represents twice the
// -dB value. Example: 19 represents -9.5dB.
uint8_t volume = 0;
bool muted = false;
};