// De-init all the peripherical,
// and launch the Nordic USB bootloader located @ 0x7800
void launchBootloader()
{
void (*bootloader)() = (void (*)())0x7800;
//Deactivate the interruptions
IEN0 = 0x00;
//Deinitialise the USB
usbDeinit();
//Deinitialise the radio
radioDeinit();
//Call the bootloader
bootloader();
}
void usbInit()
{
int res, actualLen;
libusb_device *usbRawDevice;
libusb_device_descriptor usbDevDesc;
libusb_config_descriptor *usbConfigDesc;
const libusb_interface_descriptor *usbIface;
const libusb_endpoint_descriptor *usbEndpointDesc;
const usbIfaceAssoc *usbInterfaceAssoc;
const usbCDCConfig *usbCDCDesc;
if (libusb_init(&usbContext) != 0)
die("Error: Could not initialise libusb-1.0\n");
usbDevice = libusb_open_device_with_vid_pid(usbContext, 0x1CBE, 0x00FD);
if (usbDevice == NULL)
{
libusb_exit(usbContext);
die("Error: Could not find a Tiva C Launchpad to connect to\n");
}
usbRawDevice = libusb_get_device(usbDevice);
if (libusb_get_device_descriptor(usbRawDevice, &usbDevDesc) != 0 || usbDevDesc.bNumConfigurations != 1)
{
usbInitCleanup();
die("Error: libusb could not get the device descriptor for the Tiva C Launchpad\n");
}
if (libusb_get_config_descriptor(usbRawDevice, 0, &usbConfigDesc) != 0)
{
usbInitCleanup();
die("Error: libusb could not get the configuration descriptor for the Tiva C Launchpad\n");
}
else if (usbConfigDesc->bLength != 9 || usbConfigDesc->bDescriptorType != 2 ||
usbConfigDesc->bNumInterfaces != 4 || usbConfigDesc->extra_length != sizeof(usbIfaceAssoc))
{
libusb_free_config_descriptor(usbConfigDesc);
usbInitCleanup();
die("Error: The descriptor returned by the device claiming to be a Tiva C Launchpad is invalid\n");
}
usbInterfaceAssoc = (const usbIfaceAssoc *)usbConfigDesc->extra;
if (usbInterfaceAssoc->bLength != 8 || usbInterfaceAssoc->bDescriptorType != 11 ||
usbInterfaceAssoc->bInterfaceCount != 2 || usbInterfaceAssoc->bFirstInterface >= usbConfigDesc->bNumInterfaces)
{
libusb_free_config_descriptor(usbConfigDesc);
usbInitCleanup();
die("Error: The interface association returned by the device claiming to be the Tiva C Launchpad is invalid\n");
}
usbIface = usbConfigDesc->interface[usbInterfaceAssoc->bFirstInterface].altsetting;
if (usbIface->bNumEndpoints != 1 || usbIface->extra_length != sizeof(usbCDCConfig))
{
libusb_free_config_descriptor(usbConfigDesc);
usbInitCleanup();
die("Error: The interface descriptor that is supposed to be for the control interface is invalid\n");
}
usbCDCDesc = (const usbCDCConfig *)usbIface->extra;
if (usbCDCDesc->bHeaderLen != 5 || usbCDCDesc->bcdCDC != 0x0110 ||
usbCDCDesc->bACMLen != 4 || usbCDCDesc->bUnionLen != 5 ||
usbCDCDesc->bCallLen != 5)
{
libusb_free_config_descriptor(usbConfigDesc);
usbInitCleanup();
die("Error: The CDC descriptor that is provided by the control interface is invalid\n");
}
usbEndpointDesc = &usbIface->endpoint[0];
ctrlEndpoint = usbEndpointDesc->bEndpointAddress;
usbIface = usbConfigDesc->interface[usbCDCDesc->iDataInterface].altsetting;
if (usbIface->bNumEndpoints != 2 || usbIface->extra_length != 0)
{
libusb_free_config_descriptor(usbConfigDesc);
usbInitCleanup();
die("Error: The interface descriptor that is supposed to be for the data interface is invalid\n");
}
usbEndpointDesc = &usbIface->endpoint[0];
inEndpoint = usbEndpointDesc->bEndpointAddress;
usbEndpointDesc = &usbIface->endpoint[1];
outEndpoint = usbEndpointDesc->bEndpointAddress;
ctrlInterface = usbInterfaceAssoc->bFirstInterface;
dataInterface = usbCDCDesc->iDataInterface;
libusb_set_configuration(usbDevice, usbConfigDesc->bConfigurationValue);
libusb_free_config_descriptor(usbConfigDesc);
libusb_set_auto_detach_kernel_driver(usbDevice, true);
if (libusb_claim_interface(usbDevice, ctrlInterface) != 0 ||
libusb_claim_interface(usbDevice, dataInterface) != 0)
{
usbDeinit();
die("Error: Could not claim the Tiva C Launchpad virtual serial port interface\n");
}
/* Set the port baud rate */
*((uint32_t *)ctrlData) = 115200;
/* 1 stop bit, no parity, 8-bit */
ctrlData[4] = 0;
ctrlData[5] = 0;
ctrlData[6] = 8;
res = libusb_control_transfer(usbDevice, 0x21, CDC_SET_LINE_CODING, 0, ctrlInterface, ctrlData, 7, 10);
if (res != 7)
{
usbDeinit();
die("libusb returned %d: %s\n", res, libusb_strerror(res));
}
res = libusb_control_transfer(usbDevice, 0xA1, CDC_GET_LINE_CODING, 0, ctrlInterface, ctrlData, 7, 10);
if (res != 7)
{
usbDeinit();
die("libusb returned %d: %s\n", res, libusb_strerror(res));
}
res = libusb_control_transfer(usbDevice, 0x21, CDC_SET_CONTROL_LINE_STATE, 0, ctrlInterface, NULL, 0, 10);
if (res != 0)
{
usbDeinit();
die("libusb returned %d: %s\n", res, libusb_strerror(res));
}
}
