hyperion.ng/libsrc/hyperion/device/LedDeviceLightpack-hidapi.cpp

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// stl includes
#include <exception>
#include <cstring>
#include <wchar.h>
// Local Hyperion includes
#include "LedDeviceLightpack-hidapi.h"
// from USB_ID.h (http://code.google.com/p/light-pack/source/browse/CommonHeaders/USB_ID.h)
#define USB_OLD_VENDOR_ID 0x03EB
#define USB_OLD_PRODUCT_ID 0x204F
#define USB_VENDOR_ID 0x1D50
#define USB_PRODUCT_ID 0x6022
#define LIGHTPACK_INTERFACE 0
// from commands.h (http://code.google.com/p/light-pack/source/browse/CommonHeaders/commands.h)
// Commands to device, sends it in first byte of data[]
enum COMMANDS{
CMD_UPDATE_LEDS = 1,
CMD_OFF_ALL,
CMD_SET_TIMER_OPTIONS,
CMD_SET_PWM_LEVEL_MAX_VALUE, /* deprecated */
CMD_SET_SMOOTH_SLOWDOWN,
CMD_SET_BRIGHTNESS,
CMD_NOP = 0x0F
};
// from commands.h (http://code.google.com/p/light-pack/source/browse/CommonHeaders/commands.h)
enum DATA_VERSION_INDEXES{
INDEX_FW_VER_MAJOR = 1,
INDEX_FW_VER_MINOR
};
LedDeviceLightpackHidapi::LedDeviceLightpackHidapi() :
LedDevice(),
_deviceHandle(nullptr),
_serialNumber(""),
_firmwareVersion({-1,-1}),
_ledCount(-1),
_bitsPerChannel(-1),
_ledBuffer()
{
}
LedDeviceLightpackHidapi::~LedDeviceLightpackHidapi()
{
if (_deviceHandle != nullptr)
{
hid_close(_deviceHandle);
_deviceHandle = nullptr;
}
// TODO: Should be called to avoid memory loss, but only at the end of the application
//hid_exit();
}
int LedDeviceLightpackHidapi::open(const std::string & serialNumber)
{
// initialize the usb context
int error = hid_init();
if (error != 0)
{
std::cerr << "Error while initializing the hidapi context" << std::endl;
return -1;
}
std::cout << "Hidapi initialized" << std::endl;
// retrieve the list of usb devices
hid_device_info * deviceList = hid_enumerate(0x0, 0x0);
// iterate the list of devices
for (hid_device_info * deviceInfo = deviceList; deviceInfo != nullptr; deviceInfo = deviceInfo->next)
{
// try to open and initialize the device
error = testAndOpen(deviceInfo, serialNumber);
if (error == 0)
{
// a device was sucessfully opened. break from list
break;
}
}
// free the device list
hid_free_enumeration(deviceList);
if (_deviceHandle == nullptr)
{
if (_serialNumber.empty())
{
std::cerr << "No Lightpack device has been found" << std::endl;
}
else
{
std::cerr << "No Lightpack device has been found with serial " << _serialNumber << std::endl;
}
}
return _deviceHandle == nullptr ? -1 : 0;
}
int LedDeviceLightpackHidapi::testAndOpen(hid_device_info *device, const std::string & requestedSerialNumber)
{
if ((device->vendor_id == USB_VENDOR_ID && device->product_id == USB_PRODUCT_ID) ||
(device->vendor_id == USB_OLD_VENDOR_ID && device->product_id == USB_OLD_PRODUCT_ID))
{
std::cout << "Found a lightpack device. Retrieving more information..." << std::endl;
// get the serial number
std::string serialNumber = "";
if (device->serial_number != nullptr)
{
// the serial number needs to be converted to a char array instead of wchar
size_t size = wcslen(device->serial_number);
serialNumber.resize(size, '.');
for (size_t i = 0; i < size; ++i)
{
int c = wctob(device->serial_number[i]);
if (c != EOF)
{
serialNumber[i] = c;
}
}
}
else
{
std::cerr << "No serial number for Lightpack device" << std::endl;
}
std::cout << "Lightpack device found: path=" << device->path << " serial=" << serialNumber << std::endl;
// check if this is the device we are looking for
if (requestedSerialNumber.empty() || requestedSerialNumber == serialNumber)
{
// This is it!
_deviceHandle = hid_open_path(device->path);
if (_deviceHandle != nullptr)
{
_serialNumber = serialNumber;
std::cout << "Lightpack device successfully opened" << std::endl;
// get the firmware version
uint8_t buffer[256];
buffer[0] = 0; // report id
int error = hid_get_feature_report(_deviceHandle, buffer, sizeof(buffer));
if (error < 4)
{
std::cerr << "Unable to retrieve firmware version number from Lightpack device" << std::endl;
}
else
{
_firmwareVersion.majorVersion = buffer[INDEX_FW_VER_MAJOR+1];
_firmwareVersion.minorVersion = buffer[INDEX_FW_VER_MINOR+1];
}
// FOR TESTING PURPOSE: FORCE MAJOR VERSION TO 6
_firmwareVersion.majorVersion = 6;
// disable smoothing of the chosen device
disableSmoothing();
// determine the number of leds
if (_firmwareVersion.majorVersion == 4)
{
_ledCount = 8;
}
else
{
_ledCount = 10;
}
// determine the bits per channel
if (_firmwareVersion.majorVersion == 6)
{
// maybe also or version 7? The firmware suggest this is only for 6... (2013-11-13)
_bitsPerChannel = 12;
}
else
{
_bitsPerChannel = 8;
}
// set the led buffer size (repport id + command + 6 bytes per led)
_ledBuffer = std::vector<uint8_t>(2 + _ledCount * 6, 0);
_ledBuffer[0] = 0x0; // report id
_ledBuffer[1] = CMD_UPDATE_LEDS;
// return success
std::cout << "Lightpack device opened: path=" << device->path << " serial=" << _serialNumber << " version=" << _firmwareVersion.majorVersion << "." << _firmwareVersion.minorVersion << std::endl;
return 0;
}
else
{
std::cerr << "Unable to open Lightpack device. Searching for other device" << std::endl;
}
}
}
return -1;
}
int LedDeviceLightpackHidapi::write(const std::vector<ColorRgb> &ledValues)
{
return write(ledValues.data(), ledValues.size());
}
int LedDeviceLightpackHidapi::write(const ColorRgb * ledValues, int size)
{
int count = std::min(_ledCount, size);
for (int i = 0; i < count ; ++i)
{
const ColorRgb & color = ledValues[i];
// copy the most significant bits of the rgb values to the first three bytes
// offset 1 to accomodate for the report id and command byte
_ledBuffer[6*i+2] = color.red;
_ledBuffer[6*i+3] = color.green;
_ledBuffer[6*i+4] = color.blue;
// leave the next three bytes on zero...
// 12-bit values having zeros in the lowest 4 bits which is almost correct, but it saves extra
// switches to determine what to do and some bit shuffling
}
int error = writeBytes(_ledBuffer.data(), _ledBuffer.size());
return error >= 0 ? 0 : error;
}
int LedDeviceLightpackHidapi::switchOff()
{
unsigned char buf[2] = {0x0, CMD_OFF_ALL};
return writeBytes(buf, sizeof(buf)) == sizeof(buf);
}
const std::string &LedDeviceLightpackHidapi::getSerialNumber() const
{
return _serialNumber;
}
int LedDeviceLightpackHidapi::getLedCount() const
{
return _ledCount;
}
int LedDeviceLightpackHidapi::writeBytes(uint8_t *data, int size)
{
// std::cout << "Writing " << size << " bytes: ";
// for (int i = 0; i < size ; ++i) printf("%02x ", data[i]);
// std::cout << std::endl;
int error = hid_send_feature_report(_deviceHandle, data, size);
if (error == size)
{
return 0;
}
std::cerr << "Unable to write " << size << " bytes to Lightpack device(" << error << ")" << std::endl;
return error;
}
int LedDeviceLightpackHidapi::disableSmoothing()
{
unsigned char buf[2] = {CMD_SET_SMOOTH_SLOWDOWN, 0};
return writeBytes(buf, sizeof(buf)) == sizeof(buf);
}