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simplify and cleanup usb_serial.c (FS#10149 by Tomer Shalev)

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20746 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Frank Gevaerts 2009-04-19 19:25:59 +00:00
parent 75a0a434d1
commit 4bff30a77f
1 changed files with 28 additions and 36 deletions
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64
firmware/usbstack/usb_serial.c
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@ -158,45 +158,41 @@ void usb_serial_disconnect(void)
static void sendout(void)
{
if(buffer_start+buffer_length >= BUFFER_SIZE)
buffer_transitlength = MIN(buffer_length,BUFFER_SIZE-buffer_start);
if(buffer_transitlength > 0)
{
/* Buffer wraps. Only send the first part */
buffer_transitlength=BUFFER_SIZE - buffer_start;
}
else
{
/* Send everything */
buffer_transitlength=buffer_length;
}
if(buffer_transitlength>0)
{
buffer_length-=buffer_transitlength;
buffer_length -= buffer_transitlength;
usb_drv_send_nonblocking(ep_in, &send_buffer[buffer_start],
buffer_transitlength);
buffer_transitlength);
}
}
void usb_serial_send(unsigned char *data,int length)
{
if(!active)
int freestart, available_end_space, i;
if (!active||length<=0)
return;
if(length<=0)
return;
int freestart=(buffer_start+buffer_length+buffer_transitlength)%BUFFER_SIZE;
if(buffer_start+buffer_transitlength+buffer_length >= BUFFER_SIZE)
i=buffer_start+buffer_length+buffer_transitlength;
freestart=i%BUFFER_SIZE;
available_end_space=BUFFER_SIZE-i;
if (0>=available_end_space)
{
/* current buffer wraps, so new data can't */
int available_space = BUFFER_SIZE - buffer_length - buffer_transitlength;
length=MIN(length,available_space);
memcpy(&send_buffer[freestart],
data,length);
/* current buffer wraps, so new data can't wrap */
int available_space = BUFFER_SIZE -
(buffer_length + buffer_transitlength);
length = MIN(length,available_space);
memcpy(&send_buffer[freestart],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+buffer_transitlength));
int first_chunk = MIN(length,available_end_space);
memcpy(&send_buffer[freestart],data,first_chunk);
length-=first_chunk;
buffer_length+=first_chunk;
@ -207,20 +203,18 @@ void usb_serial_send(unsigned char *data,int length)
buffer_length+=MIN(length,buffer_start);
}
}
if(buffer_transitlength>0)
{
/* Do nothing. The transfer completion handler will pick it up */
}
else
{
if (buffer_transitlength==0)
sendout();
}
/* else do nothing. The transfer completion handler will pick it up */
}
/* called by usb_core_transfer_complete() */
void usb_serial_transfer_complete(int ep,int dir, int status, int length)
{
(void)ep;
(void)length;
switch (dir) {
case USB_DIR_OUT:
logf("serial: %s", receive_buffer);
@ -234,11 +228,9 @@ void usb_serial_transfer_complete(int ep,int dir, int status, int length)
/* Data sent out. Update circular buffer */
if(status == 0)
{
if(length!=buffer_transitlength)
{
/* do something? */
}
buffer_start = (buffer_start + buffer_transitlength)%BUFFER_SIZE;
/* TODO: Handle (length != buffer_transitlength) */
buffer_start=(buffer_start+buffer_transitlength)%BUFFER_SIZE;
buffer_transitlength = 0;
}