mirror of
https://github.com/switchbrew/switch-examples.git
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237 lines
12 KiB
C
237 lines
12 KiB
C
// Include the most common headers from the C standard library
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <malloc.h>
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// Include the main libnx system header, for Switch development
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#include <switch.h>
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// This example shows how to use USB devices via usbhs, see also libnx usbhs.h/usb.h.
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// Only devices which are not used by sysmodules are usable. This example will only detect/use USB mass storage devices.
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// Main program entrypoint
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int main(int argc, char* argv[])
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{
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Result rc=0, rc2=0;
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s32 total_entries=0;
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s32 i, epi, tmpi;
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Event inf_event;
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struct usb_endpoint_descriptor *ep_desc = NULL;
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UsbHsClientIfSession inf_session; // This example only uses 1 interface and 2 endpoints, an actual app may differ.
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UsbHsClientEpSession ep_sessions[2];
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UsbHsInterfaceFilter filter;
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UsbHsInterface interfaces[8];
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bool endpoints_found[2];
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// This example uses a text console, as a simple way to output text to the screen.
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// If you want to write a software-rendered graphics application,
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// take a look at the graphics/simplegfx example, which uses the libnx Framebuffer API instead.
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// If on the other hand you want to write an OpenGL based application,
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// take a look at the graphics/opengl set of examples, which uses EGL instead.
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consoleInit(NULL);
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// Configure our supported input layout: a single player with standard controller styles
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padConfigureInput(1, HidNpadStyleSet_NpadStandard);
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// Initialize the default gamepad (which reads handheld mode inputs as well as the first connected controller)
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PadState pad;
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padInitializeDefault(&pad);
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printf("usbhs example\n");
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memset(&inf_event, 0, sizeof(inf_event));
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memset(&filter, 0, sizeof(filter));
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memset(interfaces, 0, sizeof(interfaces));
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memset(&inf_session, 0, sizeof(inf_session));
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memset(&ep_sessions, 0, sizeof(ep_sessions));
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// 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.
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filter.Flags = UsbHsInterfaceFilterFlags_bInterfaceClass;
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filter.bInterfaceClass = USB_CLASS_MASS_STORAGE;
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rc = usbHsInitialize();
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if (R_FAILED(rc)) printf("usbHsInitialize() failed: 0x%x\n", rc);
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if (R_SUCCEEDED(rc)) {
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rc = usbHsCreateInterfaceAvailableEvent(&inf_event, true, 0, &filter);
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if (R_FAILED(rc)) printf("usbHsCreateInterfaceAvailableEvent() failed: 0x%x\n", rc);
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}
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if (R_SUCCEEDED(rc)) printf("Ready.\n");
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rc2=rc;
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// Main loop
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while (appletMainLoop())
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{
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// Scan the gamepad. This should be done once for each frame
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padUpdate(&pad);
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// padGetButtonsDown returns the set of buttons that have been
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// newly pressed in this frame compared to the previous one
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u64 kDown = padGetButtonsDown(&pad);
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if (kDown & HidNpadButton_Plus)
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break; // break in order to return to hbmenu
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if (R_SUCCEEDED(rc2)) rc = eventWait(&inf_event, 0);
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if (R_SUCCEEDED(rc2) && R_SUCCEEDED(rc)) {
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printf("The available interfaces have changed.\n");
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memset(interfaces, 0, sizeof(interfaces));
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rc = usbHsQueryAvailableInterfaces(&filter, interfaces, sizeof(interfaces), &total_entries);
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if (R_FAILED(rc)) printf("usbHsQueryAvailableInterfaces() failed: 0x%x\n", rc);
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if (R_SUCCEEDED(rc)) {
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printf("total: %d\n", total_entries);
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for(i=0; i<total_entries; i++) {
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printf("%d: pathstr = %s\n", i, interfaces[i].pathstr);//Run any interfaces[i] processing here.
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// 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.
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rc = usbHsAcquireUsbIf(&inf_session, &interfaces[i]);
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printf("usbHsAcquireUsbIf(interface index = %d) returned: 0x%x\n", i, rc);
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if (R_SUCCEEDED(rc)) {
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u8* tmpbuf = memalign(0x1000, 0x1000);// The allocated buffer address/size must be 0x1000-byte aligned, for usbHsIfCtrlXfer/usbHsEpPostBuffer.
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if (tmpbuf) {
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u32 transferredSize=0;
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// Note that an actual app may want to validate that transferredSize==<input size>.
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// This shows how to use a control transfer, an actual app might not need this.
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// This gets descriptors starting with the config descriptor, via a control transfer.
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memset(tmpbuf, 0, 0x1000);
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rc = usbHsIfCtrlXfer(&inf_session, USB_ENDPOINT_IN, USB_REQUEST_GET_DESCRIPTOR, (USB_DT_CONFIG<<8) | 0, 0, 0x40, tmpbuf, &transferredSize);
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printf("usbHsIfCtrlXfer(interface index = %d) returned: 0x%x, transferredSize=0x%x\n", i, rc, transferredSize);
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if (R_SUCCEEDED(rc)) {
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for(tmpi=0; tmpi<transferredSize; tmpi++)printf("%02X", tmpbuf[tmpi]);
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printf("\n");
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}
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rc = 1;
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// Locate any endpoints you want to use by going through input_endpoint_descs/output_endpoint_descs.
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// Note that official sw uses control transfer(s) to get the descriptors (see above).
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// This example uses 1 OUTPUT and INPUT endpoint, with an actual app this may differ.
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memset(endpoints_found, 0, sizeof(endpoints_found));
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for(epi=0; epi<15; epi++) {
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ep_desc = &inf_session.inf.inf.output_endpoint_descs[epi];
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if (ep_desc->bLength != 0 && ep_desc->bEndpointAddress == (USB_ENDPOINT_OUT | 0x1)) {
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printf("Using OUTPUT endpoint %d.\n", epi);
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endpoints_found[0] = true;
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rc = usbHsIfOpenUsbEp(&inf_session, &ep_sessions[0], 1, ep_desc->wMaxPacketSize, ep_desc);
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printf("usbHsIfOpenUsbEp returned: 0x%x\n", rc);
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if (R_FAILED(rc)) break;
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}
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ep_desc = &inf_session.inf.inf.input_endpoint_descs[epi];
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if (ep_desc->bLength != 0 && ep_desc->bEndpointAddress == (USB_ENDPOINT_IN | 0x2)) {
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printf("Using INPUT endpoint %d.\n", epi);
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endpoints_found[1] = true;
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rc = usbHsIfOpenUsbEp(&inf_session, &ep_sessions[1], 1, ep_desc->wMaxPacketSize, ep_desc);
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printf("usbHsIfOpenUsbEp returned: 0x%x\n", rc);
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if (R_FAILED(rc)) break;
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}
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if (endpoints_found[0] && endpoints_found[1]) break;
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}
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if (!endpoints_found[0] || !endpoints_found[1]) {
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printf("Failed to find the required endpoints.\n");
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rc = 2;
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}
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// Use the endpoints. An actual app would have different endpoint handling, depending on the USB device.
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// Write data to the OUTPUT endpoint. In this case this is a mass-storage SCSI Inquiry.
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// Note that an actual app may want to validate transferredSize.
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if (R_SUCCEEDED(rc)) {
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memset(tmpbuf, 0, 0x1000);
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u8 tmpdata[] = {0x55, 0x53, 0x42, 0x43, 0x01, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x80, 0x00, 0x06, 0x12, 0x00, 0x00, 0x00, 0x24, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00};
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memcpy(tmpbuf, tmpdata, sizeof(tmpdata));
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transferredSize = 0;
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rc = usbHsEpPostBuffer(&ep_sessions[0], tmpbuf, sizeof(tmpdata), &transferredSize);
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printf("usbHsEpPostBuffer returned: 0x%x, transferredSize=0x%x\n", rc, transferredSize);
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}
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// Read data from the INPUT endpoint. In this case this is mass-storage SCSI Inquiry response data.
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// Note that an actual app may want to validate transferredSize.
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if (R_SUCCEEDED(rc)) {
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memset(tmpbuf, 0, 0x1000);
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transferredSize = 0;
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rc = usbHsEpPostBuffer(&ep_sessions[1], tmpbuf, 0x200, &transferredSize);
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printf("usbHsEpPostBuffer returned: 0x%x, transferredSize=0x%x\n", rc, transferredSize);
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if (R_SUCCEEDED(rc)) {
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for(tmpi=0; tmpi<transferredSize; tmpi++)printf("%02X", tmpbuf[tmpi]);
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printf("\n");
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}
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}
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// At this point this example is done using the endpoints, close these.
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usbHsEpClose(&ep_sessions[0]);
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usbHsEpClose(&ep_sessions[1]);
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free(tmpbuf);
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}
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else
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printf("tmpbuf alloc failed.\n");
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usbHsIfClose(&inf_session); // At this point this example is done using the interface, close it.
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}
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}
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}
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}
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// Signaled when a device was removed, cleanup state if our interface can't be found in the usbHsQueryAcquiredInterfaces output.
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if (R_SUCCEEDED(rc2)) rc = eventWait(usbHsGetInterfaceStateChangeEvent(), 0);
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if (R_SUCCEEDED(rc2) && R_SUCCEEDED(rc)) {
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eventClear(usbHsGetInterfaceStateChangeEvent());
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printf("InterfaceStateChangeEvent was signaled.\n");
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// 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.
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if (usbHsIfIsActive(&inf_session)) {
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memset(interfaces, 0, sizeof(interfaces));
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rc = usbHsQueryAcquiredInterfaces(interfaces, sizeof(interfaces), &total_entries);
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if (R_FAILED(rc)) printf("usbHsQueryAcquiredInterfaces() failed: 0x%x\n", rc);
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if (R_SUCCEEDED(rc)) {
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bool found_flag = 0;
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for(i=0; i<total_entries; i++) {
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if (usbHsIfGetID(&inf_session) == interfaces[i].inf.ID) {
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found_flag = 1;
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break;
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}
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}
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if(!found_flag) {
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printf("Interface not found, cleaning up state...\n");
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usbHsEpClose(&ep_sessions[0]);
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usbHsEpClose(&ep_sessions[1]);
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usbHsIfClose(&inf_session);
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}
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}
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}
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}
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// Update the console, sending a new frame to the display
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consoleUpdate(NULL);
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}
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// Make sure to cleanup interface/endpoint state before exiting, if it's not already closed.
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usbHsDestroyInterfaceAvailableEvent(&inf_event, 0);
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usbHsExit();
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// Deinitialize and clean up resources used by the console (important!)
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consoleExit(NULL);
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return 0;
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}
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