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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id: $
*
* Copyright (C) 2007 by Christian Gmeiner
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "string.h"
#include "system.h"
#include "usb_core.h"
#include "usb_drv.h"
#include "kernel.h"
//#define LOGF_ENABLE
#include "logf.h"
#ifdef USB_SERIAL
#define BUFFER_SIZE 512 /* Max 16k because of controller limitations */
static unsigned char _send_buffer[BUFFER_SIZE] __attribute__((aligned(32)));
static unsigned char* send_buffer;
static unsigned char _receive_buffer[512] __attribute__((aligned(32)));
static unsigned char* receive_buffer;
static bool busy_sending = false;
static int buffer_start;
static int buffer_length;
static bool active = false;
static struct mutex sendlock;
/* called by usb_code_init() */
void usb_serial_init(void)
{
logf("serial: init");
send_buffer = (void*)UNCACHED_ADDR(&_send_buffer);
receive_buffer = (void*)UNCACHED_ADDR(&_receive_buffer);
busy_sending = false;
buffer_start = 0;
buffer_length = 0;
active = true;
mutex_init(&sendlock);
}
void usb_serial_exit(void)
{
active = false;
}
static void sendout(void)
{
if(buffer_start+buffer_length > BUFFER_SIZE)
{
/* Buffer wraps. Only send the first part */
usb_drv_send_nonblocking(EP_SERIAL, &send_buffer[buffer_start],(BUFFER_SIZE - buffer_start));
}
else
{
/* Send everything */
usb_drv_send_nonblocking(EP_SERIAL, &send_buffer[buffer_start],buffer_length);
}
busy_sending=true;
}
void usb_serial_send(unsigned char *data,int length)
{
if(!active)
return;
if(length<=0)
return;
mutex_lock(&sendlock);
if(buffer_start+buffer_length > BUFFER_SIZE)
{
/* current buffer wraps, so new data can't */
int available_space = BUFFER_SIZE - buffer_length;
length=MIN(length,available_space);
memcpy(&send_buffer[(buffer_start+buffer_length)%BUFFER_SIZE],data,length);
buffer_length+=length;
}
else
{
/* current buffer doesn't wrap, so new data might */
int available_end_space = (BUFFER_SIZE - (buffer_start + buffer_length));
int first_chunk = MIN(length,available_end_space);
memcpy(&send_buffer[buffer_start + buffer_length],data,first_chunk);
length-=first_chunk;
buffer_length+=first_chunk;
if(length>0)
{
/* wrap */
memcpy(&send_buffer[0],&data[first_chunk],MIN(length,buffer_start));
buffer_length+=MIN(length,buffer_start);
}
}
if(busy_sending)
{
/* Do nothing. The transfer completion handler will pick it up */
}
else
{
sendout();
}
mutex_unlock(&sendlock);
}
/* called by usb_core_transfer_complete() */
void usb_serial_transfer_complete(bool in, int status, int length)
{
switch (in) {
case false:
logf("serial: %s", receive_buffer);
/* Data received. TODO : Do something with it ? */
usb_drv_recv(EP_SERIAL, receive_buffer, sizeof _receive_buffer);
break;
case true:
mutex_lock(&sendlock);
/* Data sent out. Update circular buffer */
if(status == 0)
{
buffer_start = (buffer_start + length)%BUFFER_SIZE;
buffer_length -= length;
}
busy_sending = false;
if(buffer_length>0)
{
sendout();
}
mutex_unlock(&sendlock);
break;
}
}
/* called by usb_core_control_request() */
bool usb_serial_control_request(struct usb_ctrlrequest* req)
{
bool handled = false;
switch (req->bRequest) {
case USB_REQ_SET_CONFIGURATION:
logf("serial: set config");
/* prime rx endpoint */
usb_drv_recv(EP_SERIAL, receive_buffer, sizeof _receive_buffer);
handled = true;
/* we come here too after a bus reset, so reset some data */
mutex_lock(&sendlock);
busy_sending = false;
if(buffer_length>0)
{
sendout();
}
mutex_unlock(&sendlock);
break;
default:
logf("serial: unhandeld req %d", req->bRequest);
}
return handled;
}
#endif /*USB_SERIAL*/
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