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/* USB Serial Transmit Bandwidth Test for Teensy USB Development Board
* http://www.pjrc.com/teensy/
* Copyright (c) 2009 PJRC.COM, LLC
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <avr/io.h>
#include <avr/pgmspace.h>
#include <stdint.h>
#include <util/delay.h>
#include "usb_serial.h"
#define LED_CONFIG (DDRD |= (1<<6))
#define LED_ON (PORTD &= ~(1<<6))
#define LED_OFF (PORTD |= (1<<6))
#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
void send_str(const char *s);
#define CLEAR_TIMER0_OVERFLOW() (TIFR0 |= (1<<TOV0))
#define IS_TIMER0_OVERFLOW() (TIFR0 & (1<<TOV0))
// USB Serial Transmit Bandwidth Test
//
// Within 5 seconds of opening the port, this program
// will send a message as rapidly as possible, for 10 seconds.
// When finished, turn off text capture (some programs will not
// write the last data until you do this), delete any extra lines
// at the beginning, and then the file size divided by 10 is the
// maximum transmit bandwidth.
//
// To use this, run a terminal emulator and select the option
// to capture all text to a file. On Linux & MacOS, you can use
// the cat command to read data to a file, such as:
// cat /dev/cu.usbmodem12341 > /tmp/test.txt
// The serial_read.exe or serial_list program can read the data
// without saving it.
// Results can vary depending on the number of other USB devices
// connected. For fastest results, disconnect all others.
// Results on Ubuntu 9.04, using: ./serial_listen /dev/ttyACM0
// Teensy++: 11565234 in 10 seconds
// Teensy: 9610184 in 10 seconds
// Results on Mac OS X 10.5.7, using: ./serial_listen /dev/cu.usbmodem12341
// Teensy++: 9013787 in 10 seconds
// Teensy: 6386395 in 10 seconds
// Results on Windows XP SP3, using: serial_read.exe COM3:
// Teensy++: 10220367 in 10 seconds
// Teensy: 8196387 in 10 seconds
// Results on Windows Vista SP1, using: serial_read.exe COM3:
// Teensy++: 10234275 in 10 seconds
// Teensy: 8196204 in 10 seconds
// Results on Windows 7 (beta 7100), using: serial_read.exe COM3:
// Teensy++: 10274718 in 10 seconds
// Teensy: 8225423 in 10 seconds
// All 5 of these were tested on a Macbook with Intel dual core 2.4 Ghz,
// external USB mouse + built-in USB peripherals
int main(void)
{
uint8_t n;
uint16_t count;
const char test_string[] = {
"USB Fast Serial Transmit Bandwidth Test, capture this text.\r\n"};
// set for 16 MHz clock, and turn on the LED
CPU_PRESCALE(0);
LED_CONFIG;
LED_OFF;
DDRC |= (1<<2); // Pin C2 to show % cpu usage
// configure timer0 to overflow every 4 ms, prescale=256, top=250
// 250 * 256 / 16 MHz = 4 ms
TIMSK0 = 0;
TCCR0A = (1<<WGM01)|(1<<WGM00);
OCR0A = 250;
TCCR0B = (1<<WGM02)|(1<<CS02);
// initialize the USB, and then wait for the host
// to set configuration. If the Teensy is powered
// without a PC connected to the USB port, this
// will wait forever.
usb_init();
while (!usb_configured()) /* wait */ ;
_delay_ms(1000);
while (1) {
// wait for the user to run their terminal emulator program
// which sets DTR to indicate it is ready to receive.
while (!(usb_serial_get_control() & USB_SERIAL_DTR)) /* wait */ ;
// Turn the LED on while sending data
LED_ON;
// give the user 5 seconds to enable text capture in their
// terminal emulator, or do whatever to get ready
for (n=5; n; n--) {
send_str(PSTR("10 second speed test begins in "));
usb_serial_putchar(n + '0');
send_str(PSTR(" sec.\r\n"));
if (!(usb_serial_get_control() & USB_SERIAL_DTR)) break;
_delay_ms(1000);
}
// wait for a 4 ms timer0 period to begin
CLEAR_TIMER0_OVERFLOW();
while (!IS_TIMER0_OVERFLOW()) /* wait */ ;
CLEAR_TIMER0_OVERFLOW();
count=0;
// send a string as fast as possible, for 10 seconds
while (1) {
usb_serial_write(test_string, (uint16_t)(sizeof(test_string)-1));
if (IS_TIMER0_OVERFLOW()) {
CLEAR_TIMER0_OVERFLOW();
count++;
if (count == 2500) break; // 10 sec
if (!(usb_serial_get_control() & USB_SERIAL_DTR)) break;
}
}
PORTC &= ~(1<<2);
send_str(PSTR("done!\r\n"));
LED_OFF;
// after the test, wait forever doing nothing,
// well, at least until the terminal emulator quits
// or drops DTR for some reason.
while (usb_serial_get_control() & USB_SERIAL_DTR) /* wait */ ;
}
}
// Send a string to the USB serial port. The string must be in
// flash memory, using PSTR
//
void send_str(const char *s)
{
char c;
while (1) {
c = pgm_read_byte(s++);
if (!c) break;
usb_serial_putchar(c);
}
}
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