Cours:LeonardoSerialUsb : Différence entre versions

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(Page créée avec « Nous allons utiliser du code du site pjrc.com : https://www.pjrc.com/teensy/usb_serial.html Nous aurons besoin des 2 fichiers suivants : {{boîte déroulante début|tit... »)
 
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         }
 
         }
 
UECONX = (1<<STALLRQ) | (1<<EPEN); // stall
 
UECONX = (1<<STALLRQ) | (1<<EPEN); // stall
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}
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</source>
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{{boîte déroulante fin}}
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{{boîte déroulante début|titre=Fichier : exemple.c}}
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/* Simple example for Teensy USB Development Board
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* http://www.pjrc.com/teensy/
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* Copyright (c) 2008 PJRC.COM, LLC
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
 +
* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
 +
* furnished to do so, subject to the following conditions:
 +
*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 +
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* 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.
 +
*/
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 +
#include <avr/io.h>
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#include <avr/pgmspace.h>
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#include <stdint.h>
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#include <util/delay.h>
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#include "usb_serial.h"
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 +
#define LED_CONFIG (DDRD |= (1<<6))
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#define LED_ON (PORTD |= (1<<6))
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#define LED_OFF (PORTD &= ~(1<<6))
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#define CPU_PRESCALE(n) (CLKPR = 0x80, CLKPR = (n))
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void send_str(const char *s);
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uint8_t recv_str(char *buf, uint8_t size);
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void parse_and_execute_command(const char *buf, uint8_t num);
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#if 0
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// Very simple character echo test
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int main(void)
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{
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CPU_PRESCALE(0);
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usb_init();
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while (1) {
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int n = usb_serial_getchar();
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if (n >= 0) usb_serial_putchar(n);
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}
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}
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#else
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// Basic command interpreter for controlling port pins
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int main(void)
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{
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char buf[32];
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uint8_t n;
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// set for 16 MHz clock, and turn on the LED
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CPU_PRESCALE(0);
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LED_CONFIG;
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LED_ON;
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// initialize the USB, and then wait for the host
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// to set configuration.  If the Teensy is powered
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// without a PC connected to the USB port, this
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// will wait forever.
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usb_init();
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while (!usb_configured()) /* wait */ ;
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_delay_ms(1000);
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while (1) {
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// wait for the user to run their terminal emulator program
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// which sets DTR to indicate it is ready to receive.
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while (!(usb_serial_get_control() & USB_SERIAL_DTR)) /* wait */ ;
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// discard anything that was received prior.  Sometimes the
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// operating system or other software will send a modem
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// "AT command", which can still be buffered.
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usb_serial_flush_input();
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// print a nice welcome message
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send_str(PSTR("\r\nTeensy USB Serial Example, "
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"Simple Pin Control Shell\r\n\r\n"
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"Example Commands\r\n"
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"  B0?  Read Port B, pin 0\r\n"
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"  C2=0  Write Port C, pin 1 LOW\r\n"
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"  D6=1  Write Port D, pin 6 HIGH  (D6 is LED pin)\r\n\r\n"));
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// and then listen for commands and process them
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while (1) {
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send_str(PSTR("> "));
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n = recv_str(buf, sizeof(buf));
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if (n == 255) break;
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send_str(PSTR("\r\n"));
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parse_and_execute_command(buf, n);
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}
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}
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}
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#endif
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// Send a string to the USB serial port.  The string must be in
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// flash memory, using PSTR
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//
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void send_str(const char *s)
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{
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char c;
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while (1) {
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c = pgm_read_byte(s++);
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if (!c) break;
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usb_serial_putchar(c);
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}
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}
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// Receive a string from the USB serial port.  The string is stored
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// in the buffer and this function will not exceed the buffer size.
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// A carriage return or newline completes the string, and is not
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// stored into the buffer.
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// The return value is the number of characters received, or 255 if
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// the virtual serial connection was closed while waiting.
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//
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uint8_t recv_str(char *buf, uint8_t size)
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{
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int16_t r;
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uint8_t count=0;
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while (count < size) {
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r = usb_serial_getchar();
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if (r != -1) {
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if (r == '\r' || r == '\n') return count;
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if (r >= ' ' && r <= '~') {
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*buf++ = r;
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usb_serial_putchar(r);
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count++;
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}
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} else {
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if (!usb_configured() ||
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  !(usb_serial_get_control() & USB_SERIAL_DTR)) {
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// user no longer connected
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return 255;
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}
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// just a normal timeout, keep waiting
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}
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}
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return count;
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}
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// parse a user command and execute it, or print an error message
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//
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void parse_and_execute_command(const char *buf, uint8_t num)
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{
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uint8_t port, pin, val;
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if (num < 3) {
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send_str(PSTR("unrecognized format, 3 chars min req'd\r\n"));
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return;
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}
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// first character is the port letter
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if (buf[0] >= 'A' && buf[0] <= 'F') {
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port = buf[0] - 'A';
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} else if (buf[0] >= 'a' && buf[0] <= 'f') {
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port = buf[0] - 'a';
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} else {
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send_str(PSTR("Unknown port \""));
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usb_serial_putchar(buf[0]);
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send_str(PSTR("\", must be A - F\r\n"));
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return;
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}
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// second character is the pin number
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if (buf[1] >= '0' && buf[1] <= '7') {
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pin = buf[1] - '0';
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} else {
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send_str(PSTR("Unknown pin \""));
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usb_serial_putchar(buf[0]);
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send_str(PSTR("\", must be 0 to 7\r\n"));
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return;
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}
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// if the third character is a question mark, read the pin
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if (buf[2] == '?') {
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// make the pin an input
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*(uint8_t *)(0x21 + port * 3) &= ~(1 << pin);
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// read the pin
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val = *(uint8_t *)(0x20 + port * 3) & (1 << pin);
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usb_serial_putchar(val ? '1' : '0');
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send_str(PSTR("\r\n"));
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return;
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}
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// if the third character is an equals sign, write the pin
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if (num >= 4 && buf[2] == '=') {
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if (buf[3] == '0') {
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// make the pin an output
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*(uint8_t *)(0x21 + port * 3) |= (1 << pin);
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// drive it low
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*(uint8_t *)(0x22 + port * 3) &= ~(1 << pin);
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return;
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} else if (buf[3] == '1') {
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// make the pin an output
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*(uint8_t *)(0x21 + port * 3) |= (1 << pin);
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// drive it high
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*(uint8_t *)(0x22 + port * 3) |= (1 << pin);
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return;
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} else {
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send_str(PSTR("Unknown value \""));
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usb_serial_putchar(buf[3]);
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send_str(PSTR("\", must be 0 or 1\r\n"));
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return;
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}
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}
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// otherwise, error message
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send_str(PSTR("Unknown command \""));
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usb_serial_putchar(buf[0]);
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send_str(PSTR("\", must be ? or =\r\n"));
 
}
 
}
 
</source>
 
</source>
 
{{boîte déroulante fin}}
 
{{boîte déroulante fin}}

Version du 25 mars 2019 à 23:38

Nous allons utiliser du code du site pjrc.com : https://www.pjrc.com/teensy/usb_serial.html

Nous aurons besoin des 2 fichiers suivants :

[Développer]

Fichier : usb_serial.h

[Développer]

Fichier : usb_serial.c



[Développer]

Fichier : exemple.c

Récupérée de « http://wikigeii.iut-troyes.univ-reims.fr//index.php?title=Cours:LeonardoSerialUsb&oldid=11443 »