hyperion.ng/libsrc/leddevice/LedDeviceHyperionUsbasp.cpp

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// stl includes
#include <exception>
#include <cstring>
// Local Hyperion includes
#include "LedDeviceHyperionUsbasp.h"
// Static constants which define the Hyperion Usbasp device
uint16_t LedDeviceHyperionUsbasp::_usbVendorId = 0x16c0;
uint16_t LedDeviceHyperionUsbasp::_usbProductId = 0x05dc;
std::string LedDeviceHyperionUsbasp::_usbProductDescription = "Hyperion led controller";
LedDeviceHyperionUsbasp::LedDeviceHyperionUsbasp(const Json::Value &deviceConfig)
: LedDevice()
, _libusbContext(nullptr)
, _deviceHandle(nullptr)
{
setConfig(deviceConfig);
}
LedDeviceHyperionUsbasp::~LedDeviceHyperionUsbasp()
{
if (_deviceHandle != nullptr)
{
libusb_release_interface(_deviceHandle, 0);
libusb_attach_kernel_driver(_deviceHandle, 0);
libusb_close(_deviceHandle);
_deviceHandle = nullptr;
}
if (_libusbContext != nullptr)
{
libusb_exit(_libusbContext);
_libusbContext = nullptr;
}
}
bool LedDeviceHyperionUsbasp::setConfig(const Json::Value &deviceConfig)
{
std::string ledType = deviceConfig.get("output", "ws2801").asString();
if (ledType != "ws2801" && ledType != "ws2812")
{
throw std::runtime_error("HyperionUsbasp: invalid output; must be 'ws2801' or 'ws2812'.");
}
_writeLedsCommand = (ledType == "ws2801") ? CMD_WRITE_WS2801 : CMD_WRITE_WS2812;
return true;
}
LedDevice* LedDeviceHyperionUsbasp::construct(const Json::Value &deviceConfig)
{
return new LedDeviceHyperionUsbasp(deviceConfig);
}
int LedDeviceHyperionUsbasp::open()
{
int error;
// initialize the usb context
if ((error = libusb_init(&_libusbContext)) != LIBUSB_SUCCESS)
{
Error(_log, "Error while initializing USB context(%d):%s", error, libusb_error_name(error));
_libusbContext = nullptr;
return -1;
}
//libusb_set_debug(_libusbContext, 3);
Debug(_log, "USB context initialized");
// 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]);
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)
{
Error(_log, "No %s has been found", _usbProductDescription.c_str());
}
return _deviceHandle == nullptr ? -1 : 0;
}
int LedDeviceHyperionUsbasp::testAndOpen(libusb_device * device)
{
libusb_device_descriptor deviceDescriptor;
int error = libusb_get_device_descriptor(device, &deviceDescriptor);
if (error != LIBUSB_SUCCESS)
{
Error(_log, "Error while retrieving device descriptor(%d): %s", error, libusb_error_name(error));
return -1;
}
if (deviceDescriptor.idVendor == _usbVendorId &&
deviceDescriptor.idProduct == _usbProductId &&
deviceDescriptor.iProduct != 0 &&
getString(device, deviceDescriptor.iProduct) == _usbProductDescription)
{
// get the hardware address
int busNumber = libusb_get_bus_number(device);
int addressNumber = libusb_get_device_address(device);
Info(_log, "%s found: bus=%d address=%d", _usbProductDescription.c_str(), busNumber, addressNumber);
try
{
_deviceHandle = openDevice(device);
Info(_log, "%s successfully opened", _usbProductDescription.c_str() );
return 0;
}
catch(int e)
{
_deviceHandle = nullptr;
Error(_log, "Unable to open %s. Searching for other device(%d): %s", _usbProductDescription.c_str(), e, libusb_error_name(e));
}
}
return -1;
}
int LedDeviceHyperionUsbasp::write(const std::vector<ColorRgb> &ledValues)
{
_ledCount = ledValues.size();
int nbytes = libusb_control_transfer(
_deviceHandle, // device handle
LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | LIBUSB_ENDPOINT_OUT, // request type
_writeLedsCommand, // request
0, // value
0, // index
(uint8_t *) ledValues.data(), // data
(3*_ledCount) & 0xffff, // length
5000); // timeout
// Disabling interupts for a little while on the device results in a PIPE error. All seems to keep functioning though...
if(nbytes < 0 && nbytes != LIBUSB_ERROR_PIPE)
{
Error(_log, "Error while writing data to %s (%s)", _usbProductDescription.c_str(), libusb_error_name(nbytes));
return -1;
}
return 0;
}
int LedDeviceHyperionUsbasp::switchOff()
{
std::vector<ColorRgb> ledValues(_ledCount, ColorRgb::BLACK);
return write(ledValues);
}
libusb_device_handle * LedDeviceHyperionUsbasp::openDevice(libusb_device *device)
{
Logger * log = Logger::getInstance("LedDevice");
libusb_device_handle * handle = nullptr;
int error = libusb_open(device, &handle);
if (error != LIBUSB_SUCCESS)
{
Error(log, "unable to open device(%d): %s",error,libusb_error_name(error));
throw error;
}
// detach kernel driver if it is active
if (libusb_kernel_driver_active(handle, 0) == 1)
{
error = libusb_detach_kernel_driver(handle, 0);
if (error != LIBUSB_SUCCESS)
{
Error(log, "unable to detach kernel driver(%d): %s",error,libusb_error_name(error));
libusb_close(handle);
throw error;
}
}
error = libusb_claim_interface(handle, 0);
if (error != LIBUSB_SUCCESS)
{
Error(log, "unable to claim interface(%d): %s", error, libusb_error_name(error));
libusb_attach_kernel_driver(handle, 0);
libusb_close(handle);
throw error;
}
return handle;
}
std::string LedDeviceHyperionUsbasp::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);
}