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USB timing measurements

This commit is contained in:
Matthew Mets 2023-02-15 12:52:12 +00:00
parent 33f3fca93b
commit d70084de68
1 changed files with 40 additions and 2 deletions
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42
iceprog/rpi_pico_interface.c
View File

@ -2,6 +2,7 @@
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/time.h>
#include <libusb-1.0/libusb.h>
#define VENDOR_ID 0xCAFE
@ -12,6 +13,27 @@
libusb_context *ctx=NULL;
struct libusb_device_handle *devhaccess;
int read_calls = 0;
int write_calls = 0;
float read_time = 0;
float write_time = 0;
typedef struct {
struct timeval start_time;
struct timeval stop_time;
} time_event_t;
void time_event_start(struct timeval* start_time) {
gettimeofday(start_time, NULL);
}
float time_event_finish(struct timeval* start_time) {
struct timeval stop_time;
gettimeofday(&stop_time, NULL);
return stop_time.tv_sec + stop_time.tv_usec/1000000.0 - start_time->tv_sec - start_time->tv_usec/1000000.0;
}
// https://github.com/jerome-labidurie/avr/blob/master/fpusb/host-libusb/fpusb.c
void usb_exit ( int sig )
{
@ -19,10 +41,14 @@ void usb_exit ( int sig )
libusb_close (devhaccess);
libusb_exit (ctx);
exit(sig);
}
int usb_write(uint8_t request, uint8_t* data, int length) {
return libusb_control_transfer ( devhaccess,
struct timeval start_time;
time_event_start(&start_time);
int ret = libusb_control_transfer ( devhaccess,
0x40,
request,
0,
@ -31,10 +57,16 @@ int usb_write(uint8_t request, uint8_t* data, int length) {
length,
1000);
write_calls++;
write_time += time_event_finish(&start_time);
return ret;
}
int usb_read(uint8_t request, uint8_t* data, int length) {
return libusb_control_transfer ( devhaccess,
struct timeval start_time;
time_event_start(&start_time);
int ret = libusb_control_transfer ( devhaccess,
0xC0,
request,
0,
@ -42,6 +74,10 @@ int usb_read(uint8_t request, uint8_t* data, int length) {
data,
length,
1000);
read_calls++;
read_time += time_event_finish(&start_time);
return ret;
}
static void led_set(bool value) {
@ -186,6 +222,8 @@ static void close() {
libusb_release_interface (devhaccess, 0);
libusb_close (devhaccess);
libusb_exit (ctx);
printf("Done\n read time:%f\n write time:%f\n read calls:%i\n write calls:%i\n", read_time, write_time, read_calls, write_calls);
}
// TODO