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Added non-blocking get/put_byte routines.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8556 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Tomasz Malesinski 2006-02-03 23:28:53 +00:00
parent 507120c1b3
commit c4d24a07ab
2 changed files with 25 additions and 0 deletions
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2
firmware/export/usb_serial.h
View file

@ -22,5 +22,7 @@
void usb_serial_init(void); void usb_serial_init(void);
void usb_serial_put_byte(int b); void usb_serial_put_byte(int b);
int usb_serial_get_byte(void); int usb_serial_get_byte(void);
int usb_serial_try_put_byte(int b);
int usb_serial_try_get_byte(void);
#endif #endif

23
firmware/usb_serial.c
View file

@ -1081,6 +1081,17 @@ int usb_serial_get_byte(void)
return fifo_get_byte(&serial_in_fifo); return fifo_get_byte(&serial_in_fifo);
} }
int usb_serial_try_get_byte(void)
{
int r;
if (fifo_empty(&serial_in_fifo))
r = -1;
else
r = fifo_get_byte(&serial_in_fifo);
usb_serial_handle();
return r;
}
/* /*
Not used: Not used:
static int usb_serial_out_full(void) static int usb_serial_out_full(void)
@ -1097,6 +1108,18 @@ void usb_serial_put_byte(int b)
usb_serial_handle(); usb_serial_handle();
} }
int usb_serial_try_put_byte(int b)
{
int r = -1;
if (!fifo_full(&serial_out_fifo))
{
fifo_put_byte(&serial_out_fifo, b);
r = 0;
}
usb_serial_handle();
return r;
}
void usb_serial_init(void) void usb_serial_init(void)
{ {
fifo_init(&serial_in_fifo); fifo_init(&serial_in_fifo);