contiki/cpu/cc2538/usb/usb-serial.c

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/*
* Copyright (c) 2012, Philippe Retornaz
* Copyright (c) 2012, EPFL STI IMT LSRO1 -- Mobots group
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* \addtogroup cc2538-usb
* @{
*
* \file
* Platform process which implements a UART-like functionality over the
* cc2538's USB hardware.
*
* This has been ported over from platform/cc2530dk
*
* \author
* - Philippe Retornaz (EPFL) - Original code
* - George Oikonomou - <oikonomou@users.sourceforge.net>
* Turned this to a 'serial over USB' platform process, ported for cc2538
*/
#include "contiki.h"
#include "sys/process.h"
#include "net/linkaddr.h"
#include "usb-api.h"
#include "usb.h"
#include "usb-arch.h"
#include "cdc-acm/cdc-acm.h"
#include "ieee-addr.h"
#include <stdint.h>
/*---------------------------------------------------------------------------*/
#define DEBUG 0
#if DEBUG
#include <stdio.h>
#define PRINTF(...) printf(__VA_ARGS__)
#else
#define PRINTF(...)
#endif
/*---------------------------------------------------------------------------*/
struct lang_id {
uint8_t size;
uint8_t type;
uint16_t langid;
};
static const struct lang_id lang_id = { sizeof(lang_id), 3, 0x0409 };
/*---------------------------------------------------------------------------*/
struct serial_nr {
uint8_t size;
uint8_t type;
uint16_t string[16];
};
static struct serial_nr serial_nr = {
sizeof(serial_nr),
3, {
'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A',
'A', 'A', 'A', 'A', 'A', 'A', 'A', 'A'
}
};
/*---------------------------------------------------------------------------*/
struct manufacturer {
uint8_t size;
uint8_t type;
uint16_t string[17];
};
static const struct manufacturer manufacturer = {
sizeof(manufacturer),
3,
{
'T', 'e', 'x', 'a', 's', ' ',
'I', 'n', 's', 't', 'r', 'u', 'm', 'e', 'n', 't', 's'
}
};
/*---------------------------------------------------------------------------*/
struct product {
uint8_t size;
uint8_t type;
uint16_t string[21];
};
static const struct product product = {
sizeof(product),
3,
{
'c', 'c', '2', '5', '3', '8', ' ',
'S', 'y', 's', 't', 'e', 'm', '-', 'o', 'n', '-', 'C', 'h', 'i', 'p'
}
};
/*---------------------------------------------------------------------------*/
#define EPIN 0x82
#define EPOUT 0x03
#define RX_BUFFER_SIZE USB_EP3_SIZE
#define TX_BUFFER_SIZE (USB_EP2_SIZE - 1)
typedef struct _USBBuffer usb_buffer;
static usb_buffer data_rx_urb;
static usb_buffer data_tx_urb;
static uint8_t usb_rx_data[RX_BUFFER_SIZE];
static uint8_t enabled = 0;
#define SLIP_END 0300
static uint8_t usb_tx_data[TX_BUFFER_SIZE];
static uint8_t buffered_data = 0;
/* Callback to the input handler */
static int (* input_handler)(unsigned char c);
/*---------------------------------------------------------------------------*/
uint8_t *
usb_class_get_string_descriptor(uint16_t lang, uint8_t string)
{
switch (string) {
case 0:
return (uint8_t *)&lang_id;
case 1:
return (uint8_t *)&manufacturer;
case 2:
return (uint8_t *)&product;
case 3:
return (uint8_t *)&serial_nr;
default:
return NULL;
}
}
/*---------------------------------------------------------------------------*/
static void
set_serial_number(void)
{
uint8_t i;
uint8_t ieee[8];
uint8_t lown, highn;
uint8_t c;
ieee_addr_cpy_to(ieee, 8);
for(i = 0; i < 8; i++) {
lown = ieee[i] & 0x0F;
highn = ieee[i] >> 4;
c = lown > 9 ? 'A' + lown - 0xA : lown + '0';
serial_nr.string[i * 2 + 1] = c;
c = highn > 9 ? 'A' + highn - 0xA : highn + '0';
serial_nr.string[i * 2] = c;
}
}
/*---------------------------------------------------------------------------*/
static void
queue_rx_urb(void)
{
data_rx_urb.flags = USB_BUFFER_PACKET_END;
data_rx_urb.flags |= USB_BUFFER_NOTIFY;
data_rx_urb.data = usb_rx_data;
data_rx_urb.left = RX_BUFFER_SIZE;
data_rx_urb.next = NULL;
usb_submit_recv_buffer(EPOUT, &data_rx_urb);
}
/*---------------------------------------------------------------------------*/
static void
do_work(void)
{
unsigned int events;
events = usb_get_global_events();
if(events & USB_EVENT_CONFIG) {
/* Configure EPs. Don't enable them yet, until the CDC line is up */
usb_setup_bulk_endpoint(EPIN);
usb_setup_bulk_endpoint(EPOUT);
queue_rx_urb();
}
if(events & USB_EVENT_RESET) {
enabled = 0;
}
events = usb_cdc_acm_get_events();
if(events & USB_CDC_ACM_LINE_STATE) {
uint8_t line_state = usb_cdc_acm_get_line_state();
PRINTF("CDC-ACM event 0x%04x, Line State = %u\n", events, line_state);
if(line_state & USB_CDC_ACM_DTE) {
enabled = 1;
} else {
enabled = 0;
}
}
if(!enabled) {
return;
}
events = usb_get_ep_events(EPOUT);
if((events & USB_EP_EVENT_NOTIFICATION)
&& !(data_rx_urb.flags & USB_BUFFER_SUBMITTED)) {
if(!(data_rx_urb.flags & USB_BUFFER_FAILED)) {
if(input_handler) {
uint8_t len;
uint8_t i;
len = RX_BUFFER_SIZE - data_rx_urb.left;
for(i = 0; i < len; i++) {
input_handler(usb_rx_data[i]);
}
}
}
queue_rx_urb();
}
}
/*---------------------------------------------------------------------------*/
void
usb_serial_flush()
{
if(buffered_data == 0) {
return;
}
data_tx_urb.flags = USB_BUFFER_SHORT_END;
data_tx_urb.flags |= USB_BUFFER_NOTIFY;
data_tx_urb.next = NULL;
data_tx_urb.data = usb_tx_data;
data_tx_urb.left = buffered_data;
buffered_data = 0;
usb_submit_xmit_buffer(EPIN, &data_tx_urb);
}
/*---------------------------------------------------------------------------*/
void
usb_serial_writeb(uint8_t b)
{
if(!enabled) {
buffered_data = 0;
return;
}
usb_tx_data[buffered_data] = b;
buffered_data++;
if(buffered_data == TX_BUFFER_SIZE) {
usb_serial_flush();
}
}
/*---------------------------------------------------------------------------*/
PROCESS(usb_serial_process, "USB-Serial process");
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(usb_serial_process, ev, data)
{
PROCESS_BEGIN();
set_serial_number();
usb_setup();
usb_cdc_acm_setup();
usb_set_global_event_process(&usb_serial_process);
usb_cdc_acm_set_event_process(&usb_serial_process);
usb_set_ep_event_process(EPIN, &usb_serial_process);
usb_set_ep_event_process(EPOUT, &usb_serial_process);
while(1) {
PROCESS_WAIT_EVENT();
if(ev == PROCESS_EVENT_EXIT) {
break;
}
if(ev == PROCESS_EVENT_POLL) {
do_work();
}
}
PROCESS_END();
}
/*---------------------------------------------------------------------------*/
void
usb_serial_set_input(int (* input)(unsigned char c))
{
input_handler = input;
}
/*---------------------------------------------------------------------------*/
void
usb_serial_init()
{
process_start(&usb_serial_process, NULL);
}
/*---------------------------------------------------------------------------*/
/** @} */