// Include the most common headers from the C standard library
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <malloc.h>
// Include the main libnx system header, for Switch development
#include <switch.h>
// This example shows how to use USB devices via usbhs, see also libnx usbhs.h/usb.h.
// Only devices which are not used by sysmodules are usable. With the below filter, this will only detect USB mass storage devices.
// Main program entrypoint
int main(int argc, char* argv[])
{
Result rc=0;
s32 total_entries=0;
s32 i, epi, tmpi;
Event inf_event;
struct usb_endpoint_descriptor *ep_desc = NULL;
UsbHsClientIfSession inf_session;//This example only uses 1 interface/endpoint, an actual app may use multiple.
UsbHsClientEpSession ep_session;
UsbHsInterfaceFilter filter;
UsbHsInterface interfaces[8];
// This example uses a text console, as a simple way to output text to the screen.
// If you want to write a software-rendered graphics application,
// take a look at the graphics/simplegfx example, which uses the libnx Framebuffer API instead.
// If on the other hand you want to write an OpenGL based application,
// take a look at the graphics/opengl set of examples, which uses EGL instead.
consoleInit(NULL);
printf("usbhs example\n");
memset(&inf_event, 0, sizeof(inf_event));
memset(&filter, 0, sizeof(filter));
memset(interfaces, 0, sizeof(interfaces));
memset(&inf_session, 0, sizeof(inf_session));
memset(&ep_session, 0, sizeof(ep_session));
//See libnx usbhs.h regarding filtering. Flags has to be set, since [7.0.0+] doesn't allow using a filter struct which matches an existing one.
filter.Flags = UsbHsInterfaceFilterFlags_bInterfaceClass;
filter.bInterfaceClass = USB_CLASS_MASS_STORAGE;
rc = usbHsInitialize();
if (R_FAILED(rc)) printf("usbHsInitialize() failed: 0x%x\n", rc);
if (R_SUCCEEDED(rc)) {
rc = usbHsCreateInterfaceAvailableEvent(&inf_event, true, 0, &filter);
if (R_FAILED(rc)) printf("usbHsCreateInterfaceAvailableEvent() failed: 0x%x\n", rc);
}
if (R_SUCCEEDED(rc)) printf("Ready.\n");
// Main loop
while (appletMainLoop())
{
// Scan all the inputs. This should be done once for each frame
hidScanInput();
// hidKeysDown returns information about which buttons have been
// just pressed in this frame compared to the previous one
u64 kDown = hidKeysDown(CONTROLLER_P1_AUTO);
if (kDown & KEY_PLUS)
break; // break in order to return to hbmenu
rc = eventWait(&inf_event, 0);
if (R_SUCCEEDED(rc)) {
printf("The available interfaces have changed.\n");
memset(interfaces, 0, sizeof(interfaces));
rc = usbHsQueryAvailableInterfaces(&filter, interfaces, sizeof(interfaces), &total_entries);
if (R_FAILED(rc)) printf("usbHsQueryAvailableInterfaces() failed: 0x%x\n", rc);
if (R_SUCCEEDED(rc)) {
printf("total: %d\n", total_entries);
for(i=0; i<total_entries; i++) {
printf("%d: pathstr = %s\n", i, interfaces[i].pathstr);//Run any interfaces[i] processing here.
// You can verify whether this is an interface you want to use by checking the content of interfaces[i], or do so later via control transfers etc.
rc = usbHsAcquireUsbIf(&inf_session, &interfaces[i]);
printf("usbHsAcquireUsbIf(interface index = %d) returned: 0x%x\n", i, rc);
if (R_SUCCEEDED(rc)) {
u8* tmpbuf = memalign(0x1000, 0x1000);// The allocated buffer address/size must be 0x1000-byte aligned, for usbHsIfCtrlXfer/usbHsEpPostBuffer.
if (tmpbuf) {
u32 transferredSize=0;
// Note that an actual app may want to validate that transferredSize==<input size>.
// This shows how to use a control transfer, an actual app might not need this.
// This gets descriptors starting with the config descriptor, via a control transfer.
memset(tmpbuf, 0, 0x1000);
rc = usbHsIfCtrlXfer(&inf_session, USB_ENDPOINT_IN, USB_REQUEST_GET_DESCRIPTOR, (USB_DT_CONFIG<<8) | 0, 0, 0x40, tmpbuf, &transferredSize);
printf("usbHsIfCtrlXfer(interface index = %d) returned: 0x%x, transferredSize=0x%x\n", i, rc, transferredSize);
if (R_SUCCEEDED(rc)) {
for(tmpi=0; tmpi<transferredSize; tmpi++)printf("%02X", tmpbuf[tmpi]);
printf("\n");
}
rc = 1;
// Locate any endpoints you want to use by going through input_endpoint_descs/output_endpoint_descs.
for(epi=0; epi<15; epi++) {
ep_desc = &inf_session.inf.inf.input_endpoint_descs[epi];
if(ep_desc->bLength != 0) {
printf("Using endpoint %d.\n", epi);
rc = usbHsIfOpenUsbEp(&inf_session, &ep_session, 1, ep_desc->wMaxPacketSize, ep_desc);
printf("usbHsIfOpenUsbEp returned: 0x%x\n", rc);
break;
}
}
// Since this example uses just any device, this may not work for some devices since this doesn't use a proper protocol. Some devices might need unplugged and plugged back in for this to work, after running this example once.
if (R_SUCCEEDED(rc)) {
memset(tmpbuf, 0, 0x1000);
transferredSize = 0;
rc = usbHsEpPostBuffer(&ep_session, tmpbuf, 0x10, &transferredSize);
printf("usbHsEpPostBuffer returned: 0x%x, transferredSize=0x%x\n", rc, transferredSize);
if (R_SUCCEEDED(rc)) {
for(tmpi=0; tmpi<transferredSize; tmpi++)printf("%02X", tmpbuf[tmpi]);
printf("\n");
}
usbHsEpClose(&ep_session);//At this point this example is done using the endpoint, close it.
}
free(tmpbuf);
}
else
printf("tmpbuf alloc failed.\n");
usbHsIfClose(&inf_session);//At this point this example is done using the interface, close it.
}
}
}
}
// Signaled when a device was removed, cleanup state if our interface can't be found in the usbHsQueryAcquiredInterfaces output.
rc = eventWait(usbHsGetInterfaceStateChangeEvent(), 0);
if (R_SUCCEEDED(rc)) {
eventClear(usbHsGetInterfaceStateChangeEvent());
printf("InterfaceStateChangeEvent was signaled.\n");
// Only need to check the rest of this if our interface is actually initialized. This won't actually run since this example already closed the interface above.
if (usbHsIfIsActive(&inf_session)) {
memset(interfaces, 0, sizeof(interfaces));
rc = usbHsQueryAcquiredInterfaces(interfaces, sizeof(interfaces), &total_entries);
if (R_FAILED(rc)) printf("usbHsQueryAcquiredInterfaces() failed: 0x%x\n", rc);
if (R_SUCCEEDED(rc)) {
bool found_flag = 0;
for(i=0; i<total_entries; i++) {
if (usbHsIfGetID(&inf_session) == interfaces[i].inf.ID) {
found_flag = 1;
break;
}
}
if(!found_flag) {
printf("Interface not found, cleaning up state...\n");
usbHsEpClose(&ep_session);
usbHsIfClose(&inf_session);
}
}
}
}
// Update the console, sending a new frame to the display
consoleUpdate(NULL);
}
// Make sure to cleanup interface/endpoint state before exiting, if it's not already closed.
usbHsDestroyInterfaceAvailableEvent(&inf_event, 0);
usbHsExit();
// Deinitialize and clean up resources used by the console (important!)
consoleExit(NULL);
return 0;
}