240 lines
10 KiB
C
240 lines
10 KiB
C
#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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#include <errno.h>
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#include <libusb.h>
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//uncomment to DEBUG this file alone
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//#define DEBUG
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//"make debug" to get DEBUG msgs on entire program
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#include "dbg.h"
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#include "usb_operations.h"
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libusb_device_handle * open_usb_device( libusb_context *context )
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{
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int rv = 0;
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//context set to NULL since only acting as single user of libusb
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//libusb_context *context = NULL;
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//passed in from main
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debug("Initalizing libusb");
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//initialize libusb must be called prior to any other libusb function
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//returns 0 on success LIBUSB_ERROR code on failure
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//int libusb_init ( libusb_context ** context)
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int usb_init = libusb_init(&context);
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check( usb_init == LIBUSB_SUCCESS, "Failed to initialize libusb: %s", libusb_strerror(usb_init));
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//void libusb_set_debug ( libusb_context * ctx, int level )
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libusb_set_debug(context, LIBUSB_LOG_LEVEL_ERROR);
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//LIBUSB_LOG_LEVEL_NONE (0) : no messages ever printed by the library (default)
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//LIBUSB_LOG_LEVEL_ERROR (1) : error messages are printed to stderr
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//LIBUSB_LOG_LEVEL_WARNING (2) : warning and error messages are printed to stderr
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//LIBUSB_LOG_LEVEL_INFO (3) : informational messages are printed to stdout,
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// warning and error messages are printed to stderr
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//LIBUSB_LOG_LEVEL_DEBUG (4) : debug and informational messages are printed to stdout,
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// warnings and errors to stderr
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//discover all usb devices
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libusb_device **device_list = NULL;
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//ssize_t libusb_get_device_list (libusb_context *ctx, libusb_device ***list)
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// Returns a list of USB devices currently attached to the system.
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// return value is number of devices plus one as list is null terminated, or LIBUSB_ERROR if negative.
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// Must free device list after done with it
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ssize_t dev_count = libusb_get_device_list( context, &device_list);
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check( dev_count >= 0, "libusb unable to find any devices: %s", libusb_strerror(dev_count));
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ssize_t i = 0;
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libusb_device *retroprog = NULL;
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libusb_device *device = NULL;
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struct libusb_device_descriptor desc;
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libusb_device_handle *handle = NULL;
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unsigned char str[256];
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debug("searching %d total devices", dev_count-1);
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for( i=0; i<dev_count; i++) {
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device = device_list[i];
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debug("getting dev desc %d", i);
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rv = libusb_get_device_descriptor( device, &desc);
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check( rv == LIBUSB_SUCCESS, "Unable to get device #%d descriptor: %s", i, libusb_strerror(rv));
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debug("checking %x vendor", desc.idVendor);
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debug("checking %x product", desc.idProduct);
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if ((desc.idVendor == 0x16C0) && (desc.idProduct == 0x05DC)) {
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retroprog = device;
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debug("found vend %x prod %x\n", desc.idVendor, desc.idProduct);
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debug("manf: %d prod: %d\n", desc.iManufacturer, desc.iProduct);
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//opening device allows performing I/O via USB with device
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rv = libusb_open( retroprog, &handle );
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check( rv == LIBUSB_SUCCESS, "Unable to open USB device: %s", libusb_strerror(rv));
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if (desc.iManufacturer) {
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if ( libusb_get_string_descriptor_ascii( handle, desc.iManufacturer, str, sizeof(str) ) > 0) {
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debug("manf_ascii: %s\n",str);
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}
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}
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if (desc.iProduct) {
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if ( libusb_get_string_descriptor_ascii( handle, desc.iProduct, str, sizeof(str) ) > 0) {
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debug("prod_ascii: %s\n",str);
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}
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}
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if (desc.bcdDevice) {
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debug("bcd Device: %x\n",desc.bcdDevice);
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//old firmware returns 256, new returns 512
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//old firmware returns 0x100, new returns 0x200
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//USB_CFG_DEVICE_VERSION 0x00, 0x01 for v1.0, 0x00, 0x02 for v2.0 (minor then major)
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//v2.0 released late 2016
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}
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//TODO verify it's INL Retro Prog by InfiniteNesLives.com, then break
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//else close handle and keep searching as there might be other devices with matching prod/devIDs
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//also verify firmware version is compatible
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//
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//TODO verify have permission to interface with device, else give notice to user
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break;
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}
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}
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check( retroprog != NULL, "Could not find INL retro-prog USB device");
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//free device list now that INL retro-prog was found and opened
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//void libusb_free_device_list ( libusb_device ** list, int unref_devices )
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libusb_free_device_list( device_list, 1); //don't completely understand the unref_devices = 1...
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device_list = NULL; //denote that device list is free if end up in error
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//Guess this is what you're supposed to do..
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// the process of opening a device can be viewed as follows:
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//
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// Discover devices using libusb_get_device_list().
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// Choose the device that you want to operate, and call libusb_open().
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// Unref all devices in the discovered device list.
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// Free the discovered device list.
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//
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// The order is important - you must not unreference the device before attempting to open it, because unreferencing it may destroy the device.
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//
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// For convenience, the libusb_free_device_list() function includes a parameter to optionally unreference all the devices in the list before freeing the list itself. This combines steps 3 and 4 above.
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//
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// As an implementation detail, libusb_open() actually adds a reference to the device in question. This is because the device remains available through the handle via libusb_get_device(). The reference is deleted during libusb_close().
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//free device list if it was left open
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if (device_list) {
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printf("Whoops! freeing device list\n");
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libusb_free_device_list( device_list, 1);
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}
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return handle;
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error:
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printf("open_usb_device went to error\n");
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if (device_list) {
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printf("freeing device list\n");
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libusb_free_device_list( device_list, 1);
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}
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if (handle) {
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printf("closing usb device\n");
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libusb_close(handle);
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}
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if (usb_init == LIBUSB_SUCCESS) {
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printf("deinitializing libusb\n");
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libusb_exit(context);
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}
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if (rv == LIBUSB_ERROR_ACCESS) {
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printf("-------------------------------------------------------\n");
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printf("Denied Permission is expected for initial use on Linux.\n");
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printf("See udev-rule-help/Readme.txt in host dir for help gaining permission.\n");
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printf("Try command with sudo for a cheap temporary solution.\n");
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}
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return NULL;
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}
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void close_usb(libusb_context *context, libusb_device_handle *handle)
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{
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//must close device before exiting
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libusb_close(handle);
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handle = NULL; //delete handle reference so error won't retry closing
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//deinitialize libusb to be called after closing all devices and before teminating application
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libusb_exit(context);
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return;
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}
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//int libusb_control_transfer (libusb_device_handle *dev_handle, uint8_t bmRequestType, uint8_t bRequest, uint16_t wValue, uint16_t wIndex, unsigned char *data, uint16_t wLength, unsigned int timeout)
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//
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//SETUP PACKET FIELDS:
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//bmRequestType: ORing of req type (STD/VENDOR), recipient (think we only care about DEVICE), endpoint direction IN-dev->host OUT-host->dev
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//bRequest: single byte that can signify any 'command' or 'request' we setup.
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//The wValue and wIndex fields allow parameters to be passed with the request. Think we can do whatever we want with these
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//wLength is used the specify the number of bytes to be transferred should there be a data phase.
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//wLength the length field for the setup packet. The data buffer should be at least this size.
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// USB 1.1 low speed standard limits to 8 bytes
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// V-USB seems to break this limit with max of 254 bytes (255 designates "USB_NO_MSG"
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// V-USB allows "LONG TRANSFERS" utilizing full 16bit wLength for upto 16384 bytes = exactly 16KBytes
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// although considering sram on AVR doesn't explode with long transfers and read/write functions are in 8byte chunks,
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// I think it really is limited to 8bytes
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// One idea to squeeze more data is have a request type defined that utilizes wValue and wIndex to gain 4bytes + 8buffer = 12bytes 50% gain
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// Not sure how to gain access to wValue/wIndex with vusb drivers...
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// answer: usbFunctionSetup will get called for every setup packet and pass all 8 bytes of setup packet
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// Can ultimately answer this question by counting how many startup packets are recieved by usbFunciton setup for transfers >8 bytes
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// If when sending >8 byte control transfers, a setup packet only comes once, then there is nothing to abuse
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// however if the same setup packet gets sent for every 8 bytes, it would be better to only perform 8byte transfers and stuff
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// 4 more bytes in wValue and wIndex fields to increase throughput by ~50%!!!
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// Testing shows that usbFunctionSetup only gets called once for transfers of 254 bytes
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// So there is only one setup packet for multiple data packets of 8bytes each
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//
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//Still not sure increasing transfer length doesn't simply break up into bunch of small 8byte transfers although it doesn't sound like it.
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//245byte limit is kind of a pain.. but wValue/wIndex fields could be abused to send 256 bytes
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//Long transfers apparently max out speed @ 24KBps with 300 bytes: https://forums.obdev.at/viewtopic.php?t=3059
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//
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//PAYLOAD:
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//data: a suitably-sized data buffer for either input or output (depending on direction bits within bmRequestType)
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//
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//TIMEOUT:
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//timeout: (in millseconds) that this function should wait before giving up due to no response being received.
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// For an unlimited timeout, use value 0
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// USB nutshell: A compliant host requires control transfer response within 5sec
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//
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//RETURN:
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// Returns on success, the number of bytes actually transferred
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// LIBUSB_ERROR_TIMEOUT if the transfer timed out
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// LIBUSB_ERROR_PIPE if the control request was not supported by the device
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// LIBUSB_ERROR_NO_DEVICE if the device has been disconnected
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// another LIBUSB_ERROR code on other failures
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int usb_write_to_device( libusb_device_handle *handle, int command, unsigned char *data, uint16_t len )
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{
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//TODO translate command into request, value, index, etc
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uint8_t request = command;
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uint16_t wValue = 0; //setup packet wValue field
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uint16_t wIndex = 0; //setup packet wIndex field
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int xfr_cnt = libusb_control_transfer( handle,
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//Request type: vendor (as we define), recip: device, in: device->host
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//TODO the endpoint direction seems to be backwards...?
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LIBUSB_REQUEST_TYPE_VENDOR | LIBUSB_RECIPIENT_DEVICE | LIBUSB_ENDPOINT_IN,
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request, wValue, wIndex, data, len, SEC_5);
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printf("total bytes xfrd: %d \n", xfr_cnt);
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check( xfr_cnt >=0, "Write xfr failed with libusb error: %s", libusb_strerror(xfr_cnt));
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check( xfr_cnt == len, "Write transfer failed only %dB sent when expecting %dB", xfr_cnt, len);
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return xfr_cnt;
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error:
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return -1;
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}
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