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Diffstat (limited to 'android/WALT/app/src/main/jni/sync_clock_linux.c')
| -rw-r--r-- | android/WALT/app/src/main/jni/sync_clock_linux.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/android/WALT/app/src/main/jni/sync_clock_linux.c b/android/WALT/app/src/main/jni/sync_clock_linux.c new file mode 100644 index 0000000..1287b76 --- /dev/null +++ b/android/WALT/app/src/main/jni/sync_clock_linux.c @@ -0,0 +1,80 @@ +/* + * Copyright (C) 2015 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "sync_clock.h" + +#include <errno.h> +#include <fcntl.h> +#include <linux/usbdevice_fs.h> +#include <stdio.h> +#include <string.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <unistd.h> + + +int main(int argc, char ** argv) { + if(argc < 2) { + printf("Usage %s <device_path>\n" + "Try `lsusb | grep eensy` and use /dev/bus/usb/<Bus>/<Device>\n", + argv[0]); + return 1; + } + + printf("Opening %s\n", argv[1]); + int fd = open(argv[1], O_RDWR); + printf("open() fd=%d, errno=%d, %s\n", fd, errno, strerror(errno)); + + // The interface and endpoint numbers are defined by the TeensyUSB. They may + // be different depending on the mode (Serial vs HID) the Teensy code is + // compiled in. A real app would employ some discovery logic here. To list + // the interfaces and endpoints use `lsusb --verbose` or an app like USB + // Host Viewer on Android. Look for a "CDC Data" interface (class 0x0a). + int interface = 1; + int ep_out = 0x03; + int ep_in = 0x84; + + int ret = ioctl(fd, USBDEVFS_CLAIMINTERFACE, &interface); + printf("Interface claimed retval=%d, errno=%d, %s\n", ret, errno, strerror(errno)); + if (errno == EBUSY) { + printf("You may need to run 'sudo rmmod cdc_acm' to release the " + "interface claimed by the kernel serial driver."); + return 1; + } + + struct clock_connection clk; + clk.fd = fd; + clk.endpoint_in = ep_in; + clk.endpoint_out = ep_out; + + sync_clocks(&clk); + + printf("===========================\n" + "sync_clocks base_t=%lld, minE=%d, maxE=%d\n", + (long long int)clk.t_base, clk.minE, clk.maxE); + + // Check for clock drift. Try sleeping here to let it actually drift away. + update_bounds(&clk); + + printf("*** UPDATE ****************\n" + "Update_bounds base_t=%lld, minE=%d, maxE=%d\n", + (long long int)(clk.t_base), clk.minE, clk.maxE + ); + + + close(fd); + return 0; +}
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