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

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// stl includes
#include <exception>
#include <cstring>
// Local Hyperion includes
#include "LedDeviceLightpack.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
};
LedDeviceLightpack::LedDeviceLightpack() :
LedDevice(),
_libusbContext(nullptr),
_deviceHandle(nullptr),
_busNumber(-1),
_addressNumber(-1),
_serialNumber(""),
_firmwareVersion({-1,-1}),
_ledCount(-1),
_bitsPerChannel(-1),
_ledBuffer()
{
}
LedDeviceLightpack::~LedDeviceLightpack()
{
if (_deviceHandle != nullptr)
{
libusb_release_interface(_deviceHandle, LIGHTPACK_INTERFACE);
libusb_attach_kernel_driver(_deviceHandle, LIGHTPACK_INTERFACE);
libusb_close(_deviceHandle);
_deviceHandle = nullptr;
}
if (_libusbContext != nullptr)
{
libusb_exit(_libusbContext);
_libusbContext = nullptr;
}
}
int LedDeviceLightpack::open(const std::string & serialNumber)
{
int error;
// initialize the usb context
if ((error = libusb_init(&_libusbContext)) != LIBUSB_SUCCESS)
{
std::cerr << "Error while initializing USB context(" << error << "): " << libusb_error_name(error) << std::endl;
_libusbContext = nullptr;
return -1;
}
//libusb_set_debug(_libusbContext, 3);
std::cout << "USB context initialized" << std::endl;
// retrieve the list of usb devices
libusb_device ** deviceList;
ssize_t deviceCount = libusb_get_device_list(_libusbContext, &deviceList);
// iterate the list of devices
for (ssize_t i = 0 ; i < deviceCount; ++i)
{
// try to open and initialize the device
error = testAndOpen(deviceList[i], serialNumber);
if (error == 0)
{
// a device was sucessfully opened. break from list
break;
}
}
// free the device list
libusb_free_device_list(deviceList, 1);
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 LedDeviceLightpack::testAndOpen(libusb_device * device, const std::string & requestedSerialNumber)
{
libusb_device_descriptor deviceDescriptor;
int error = libusb_get_device_descriptor(device, &deviceDescriptor);
if (error != LIBUSB_SUCCESS)
{
std::cerr << "Error while retrieving device descriptor(" << error << "): " << libusb_error_name(error) << std::endl;
return -1;
}
if ((deviceDescriptor.idVendor == USB_VENDOR_ID && deviceDescriptor.idProduct == USB_PRODUCT_ID) ||
(deviceDescriptor.idVendor == USB_OLD_VENDOR_ID && deviceDescriptor.idProduct == USB_OLD_PRODUCT_ID))
{
std::cout << "Found a lightpack device. Retrieving more information..." << std::endl;
// get the hardware address
int busNumber = libusb_get_bus_number(device);
int addressNumber = libusb_get_device_address(device);
// get the serial number
std::string serialNumber;
if (deviceDescriptor.iSerialNumber != 0)
{
try
{
serialNumber = LedDeviceLightpack::getString(device, deviceDescriptor.iSerialNumber);
}
catch (int e)
{
std::cerr << "unable to retrieve serial number from Lightpack device(" << e << "): " << libusb_error_name(e) << std::endl;
serialNumber = "";
}
}
std::cout << "Lightpack device found: bus=" << busNumber << " address=" << addressNumber << " serial=" << serialNumber << std::endl;
// check if this is the device we are looking for
if (requestedSerialNumber.empty() || requestedSerialNumber == serialNumber)
{
// This is it!
try
{
_deviceHandle = openDevice(device);
_serialNumber = serialNumber;
_busNumber = busNumber;
_addressNumber = addressNumber;
std::cout << "Lightpack device successfully opened" << std::endl;
// get the firmware version
uint8_t buffer[256];
error = libusb_control_transfer(
_deviceHandle,
LIBUSB_ENDPOINT_IN | LIBUSB_REQUEST_TYPE_CLASS | LIBUSB_RECIPIENT_INTERFACE,
0x01,
0x0100,
0,
buffer, sizeof(buffer), 1000);
if (error < 3)
{
std::cerr << "Unable to retrieve firmware version number from Lightpack device(" << error << "): " << libusb_error_name(error) << std::endl;
}
else
{
_firmwareVersion.majorVersion = buffer[INDEX_FW_VER_MAJOR];
_firmwareVersion.minorVersion = buffer[INDEX_FW_VER_MINOR];
}
// 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 (command + 6 bytes per led)
_ledBuffer = std::vector<uint8_t>(1 + _ledCount * 6, 0);
_ledBuffer[0] = CMD_UPDATE_LEDS;
// return success
std::cout << "Lightpack device opened: bus=" << _busNumber << " address=" << _addressNumber << " serial=" << _serialNumber << " version=" << _firmwareVersion.majorVersion << "." << _firmwareVersion.minorVersion << std::endl;
return 0;
}
catch(int e)
{
_deviceHandle = nullptr;
std::cerr << "Unable to open Lightpack device. Searching for other device(" << e << "): " << libusb_error_name(e) << std::endl;
}
}
}
return -1;
}
int LedDeviceLightpack::write(const std::vector<ColorRgb> &ledValues)
{
return write(ledValues.data(), ledValues.size());
}
int LedDeviceLightpack::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 command byte
_ledBuffer[6*i+1] = color.red;
_ledBuffer[6*i+2] = color.green;
_ledBuffer[6*i+3] = 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 LedDeviceLightpack::switchOff()
{
unsigned char buf[1] = {CMD_OFF_ALL};
return writeBytes(buf, sizeof(buf)) == sizeof(buf);
}
const std::string &LedDeviceLightpack::getSerialNumber() const
{
return _serialNumber;
}
int LedDeviceLightpack::getLedCount() const
{
return _ledCount;
}
int LedDeviceLightpack::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 = libusb_control_transfer(_deviceHandle,
LIBUSB_ENDPOINT_OUT | LIBUSB_REQUEST_TYPE_CLASS | LIBUSB_RECIPIENT_INTERFACE,
0x09,
(2 << 8),
0x00,
data, size, 1000);
if (error == size)
{
return 0;
}
std::cerr << "Unable to write " << size << " bytes to Lightpack device(" << error << "): " << libusb_error_name(error) << std::endl;
return error;
}
int LedDeviceLightpack::disableSmoothing()
{
unsigned char buf[2] = {CMD_SET_SMOOTH_SLOWDOWN, 0};
return writeBytes(buf, sizeof(buf)) == sizeof(buf);
}
libusb_device_handle * LedDeviceLightpack::openDevice(libusb_device *device)
{
libusb_device_handle * handle = nullptr;
int error = libusb_open(device, &handle);
if (error != LIBUSB_SUCCESS)
{
std::cerr << "unable to open device(" << error << "): " << libusb_error_name(error) << std::endl;
throw error;
}
// detach kernel driver if it is active
if (libusb_kernel_driver_active(handle, LIGHTPACK_INTERFACE) == 1)
{
error = libusb_detach_kernel_driver(handle, LIGHTPACK_INTERFACE);
if (error != LIBUSB_SUCCESS)
{
std::cerr << "unable to detach kernel driver(" << error << "): " << libusb_error_name(error) << std::endl;
libusb_close(handle);
throw error;
}
}
error = libusb_claim_interface(handle, LIGHTPACK_INTERFACE);
if (error != LIBUSB_SUCCESS)
{
std::cerr << "unable to claim interface(" << error << "): " << libusb_error_name(error) << std::endl;
libusb_attach_kernel_driver(handle, LIGHTPACK_INTERFACE);
libusb_close(handle);
throw error;
}
return handle;
}
std::string LedDeviceLightpack::getString(libusb_device * device, int stringDescriptorIndex)
{
libusb_device_handle * handle = nullptr;
int error = libusb_open(device, &handle);
if (error != LIBUSB_SUCCESS)
{
throw error;
}
char buffer[256];
error = libusb_get_string_descriptor_ascii(handle, stringDescriptorIndex, reinterpret_cast<unsigned char *>(buffer), sizeof(buffer));
if (error <= 0)
{
libusb_close(handle);
throw error;
}
libusb_close(handle);
return std::string(buffer, error);
}