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stdin.cxx
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stdin.cxx
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// papoon_usb: "Not Insane" USB library for STM32F103xx MCUs
// Copyright (C) 2019,2020 Mark R. Rubin
//
// This file is part of papoon_usb.
//
// The papoon_usb program is free software: you can redistribute it
// and/or modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation, either version 3 of
// the License, or (at your option) any later version.
//
// The papoon_usb program is distributed in the hope that it will be
// useful, but WITHOUT ANY WARRANTY; without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// (LICENSE.txt) along with the papoon_usb program. If not, see
// <https://www.gnu.org/licenses/gpl.html>
#include <signal.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <iostream>
#include <iomanip>
#include <string>
#include <libusb.h>
namespace {
static const uint16_t VENDOR = 0x0483, // usb_dev_xxx.cxx
PRODUCT = 0x62e3, // "
MAX_IN_PACKET = 64 ; // usb_dev_simple.hxx
static const uint8_t NUM_IN_OUT_ENDPOINTS = 7, // usb_dev_max_endpts.hxx
IN_ENDPOINT = 0x81, // usb_dev_simple.hxx
OUT_ENDPOINT = 0x02; // "
static const int OUT_TIMEOUT = 1000, // milliseconds? not documented
IN_TIMEOUT = 1000; // in libusb.h
// see usb_dev_max_endpts.hxx
static const uint8_t ENDPOINTS[NUM_IN_OUT_ENDPOINTS] = {7, 2, 13, 9, 1, 15, 5};
const char* const speed_names[] = {"illegal speed code value",
"1.5 Mbit/s (USB LowSpeed)",
"12 Mbit/s (USB FullSpeed)",
"480 Mbit/s (USB HighSpeed)",
"5000 Mbit/s (USB SuperSpeed)",
"10000 Mbit/s (USB SuperSpeedPlus)",
"illegal speed code value",
};
libusb_device_handle *device_handle ;
uint8_t echo[MAX_IN_PACKET + 1]; // terminating '\0'
extern "C" void close(
int signum)
{
if (signum != SIGINT)
return;
std::cout << "\nclose (signal "
<< signum
<< "):"
<< std::endl;
std::cout << "releasing interface ..." << std::endl;
libusb_release_interface(device_handle, 0);
std::cout << "closing device handle ..." << std::endl;
libusb_close(device_handle);
std::cout << "exiting" << std::endl;
exit(signum);
}
} // namespace
int main(
int argc ,
char *argv[])
{
bool use_many = false ;
uint8_t vp_ndx = 1 ,
pended = 7 ; // prepended "cccc+ " + appended '\n'
uint16_t max_in_packet = MAX_IN_PACKET,
max_out_packet = max_in_packet,
vendor = VENDOR ,
product = PRODUCT ;
if (argc < 2 || argv[1][0] != '-') {
std::cerr << "Usage: "
<< argv[0]
<< " -s|-m [vid pid]\n"
<< "-s use with usb_echo_simple.elf\n"
<< "-m use with usb_echo_max_endpts.elf\n"
<< "vid pid vendor id, product id"
<< std::endl;
return 1;
}
if (argv[1][1] == 'm') {
use_many = true;
max_in_packet = 16 ; // see usb_dev_max_endpts.hxx
max_out_packet = 16 ; // " " . "
pended = 9 ; // prepended "e cccc+ " + appended '\n'
vp_ndx = 2 ;
}
uint16_t max_expect_packet = max_out_packet + pended < max_in_packet
? max_out_packet + pended
: max_in_packet ,
max_echo_data = max_in_packet - pended ;
if (argc == vp_ndx + 2) {
vendor = strtol(argv[vp_ndx ], 0, 16);
product = strtol(argv[vp_ndx + 1], 0, 16);
}
int error;
if ((error = libusb_init(0)) != static_cast<int>(LIBUSB_SUCCESS)) {
std::cerr << "libusb_init() failure: "
<< libusb_strerror(static_cast<libusb_error>(error))
<< '('
<< error
<< ')'
<< std::endl;
return error;
}
if (!(device_handle = libusb_open_device_with_vid_pid(0, vendor, product))){
std::cerr << "libusb_open_device_with_vid_pid(0, "
<< std::hex
<< std::setw(4)
<< std::setfill('0')
<< vendor
<< ", "
<< product
<< ") failure"
<< std::endl;
return 1;
}
if ( (error = libusb_set_auto_detach_kernel_driver(device_handle, 1))
!= static_cast<int>(LIBUSB_SUCCESS) ) {
std::cerr << "libusb_set_auto_detach_kernel_driver(device_handle, 1) "
"failure: "
<< libusb_strerror(static_cast<libusb_error>(error))
<< '('
<< error
<< ')'
<< std::endl;
return error;
}
if ( (error = libusb_claim_interface(device_handle, 0))
!= static_cast<int>(LIBUSB_SUCCESS) ) {
std::cerr << "libusb_claim_interface() failure: "
<< libusb_strerror(static_cast<libusb_error>(error))
<< '('
<< error
<< ')'
<< std::endl;
return error;
}
signal(SIGINT, close);
uint8_t out_endpoint = OUT_ENDPOINT,
in_endpoint = IN_ENDPOINT;
for (std::string input ; std::getline(std::cin, input) ; ) {
size_t length = input.length(),
offset = 0 ;
int bytes_transferred ;
if (use_many) {
out_endpoint = ENDPOINTS[rand() % NUM_IN_OUT_ENDPOINTS];
in_endpoint = out_endpoint | 0x80; // high bit, USB API
}
while (length) {
uint8_t *current = reinterpret_cast<uint8_t*>(
const_cast<char*>(
input.c_str()))
+ offset ;
size_t xfer_length
= std::min(length,
static_cast<size_t>(max_out_packet));
if ( (error = libusb_interrupt_transfer(device_handle ,
out_endpoint ,
current ,
xfer_length ,
&bytes_transferred,
OUT_TIMEOUT ))
!= static_cast<int>(LIBUSB_SUCCESS) ) {
std::cerr << "libusb_interrupt_transfer(, "
<< static_cast<unsigned>(out_endpoint)
<< "(OUT_EP), "
<< xfer_length
<< ", <"
<< bytes_transferred
<< ">, "
<< OUT_TIMEOUT
<< ") failure: "
<< libusb_strerror(static_cast<libusb_error>(error))
<< '('
<< error
<< ')'
<< std::endl;
close(error);
}
unsigned fulls = xfer_length / max_echo_data,
extra = xfer_length % max_echo_data,
expect = fulls * max_in_packet ;
if (extra) expect += extra + pended;
bool zero_length_packet = false;
while (expect || zero_length_packet) {
if ( (error = libusb_interrupt_transfer(device_handle ,
in_endpoint ,
echo ,
max_in_packet ,
&bytes_transferred,
IN_TIMEOUT ))
!= static_cast<int>(LIBUSB_SUCCESS) ) {
std::cerr << "libusb_interrupt_transfer(, "
<< static_cast<unsigned>(in_endpoint)
<< "(IN_EP), <"
<< bytes_transferred
<< ">, "
<< IN_TIMEOUT
<< ") failure: "
<< libusb_strerror(static_cast<libusb_error>
(error) )
<< '('
<< error
<< ") expect: "
<< expect
<< " bytes (in max "
<< max_in_packet
<< " sized transfers)"
<< std::endl;
close(error);
}
echo[bytes_transferred] = '\0';
std::cout << echo ;
if (zero_length_packet)
break; // got it, done
// can't be here if expect already zero but check anyway
// errors can cause stuck data to be sent late/unexpectedly
else if ( expect
&& ((expect -= bytes_transferred) == 0)
&& bytes_transferred == max_in_packet )
zero_length_packet = true;
}
std::cout << std::endl;
offset += xfer_length ;
length -= xfer_length ;
} // while (length)
} // main loop
close(SIGINT);
} // main()