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status has been added for polling function.

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This commit is contained in:
matsutsuka 2007-09-19 12:47:19 +00:00
parent 8d7bb2119c
commit c99b7dc827
3 changed files with 20 additions and 13 deletions
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8
cpu/z80/dev/rs232.c
View file

@ -27,7 +27,7 @@
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: rs232.c,v 1.2 2007/09/11 12:03:20 matsutsuka Exp $
* $Id: rs232.c,v 1.3 2007/09/19 12:47:55 matsutsuka Exp $
*
*/
/*
@ -48,7 +48,7 @@ PROCESS_THREAD(rs232_process, ev, data)
{
static struct etimer timer;
char ch;
unsigned char i;
unsigned char i, stat;
PROCESS_BEGIN();
rs232_arch_init(RS232_BAUD_RATE);
@ -59,8 +59,8 @@ PROCESS_THREAD(rs232_process, ev, data)
if (etimer_expired(&timer)) {
for (i = 0; i < RS232_BUFSIZE; i++) {
ch = rs232_arch_poll();
if (ch == 0) {
ch = rs232_arch_poll(&stat);
if (stat == 0) {
break;
}
/* We have an input data */

6
cpu/z80/dev/rs232.h
View file

@ -27,7 +27,7 @@
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* $Id: rs232.h,v 1.2 2007/09/11 12:03:20 matsutsuka Exp $
* $Id: rs232.h,v 1.3 2007/09/19 12:47:55 matsutsuka Exp $
*
*/
/*
@ -51,9 +51,9 @@ void rs232_arch_init(unsigned long ubr);
/*
* An architecture-depend implementation of RS-232C polling.
* @return character, zero if no input.
* @return character, stat == zero if no input.
*/
unsigned char rs232_arch_poll(void);
unsigned char rs232_arch_poll(unsigned char* stat);
/*
* An architecture-depend implementation of RS-232C writing a byte.

19
platform/pc-6001/dev/rs232-asm.S
View file

@ -7,7 +7,7 @@
;;;
;;; @author Takahide Matsutsuka <markn@markn.org>
;;;
;;; $Id: rs232-asm.S,v 1.1 2007/09/11 12:12:59 matsutsuka Exp $
;;; $Id: rs232-asm.S,v 1.2 2007/09/19 12:47:19 matsutsuka Exp $
;;;
;; definitions of PC-6001 BIOS routines
@ -37,18 +37,25 @@ _rs232_arch_writeb:
ret
;; ---------------------------------
;; unsigned char rs232_arch_poll();
;; Stack; retl reth
;; AFBC__HL____
;; return input byte (zero if no input)
;; unsigned char rs232_arch_poll(unsigned char *stat);
;; Stack; retl reth statl stath
;; AFBCDEHL____
;; return input byte (*stat == 0 if no input)
;; ---------------------------------
_rs232_arch_poll:
ld a,#0x01
ld hl, #2
add hl, sp
ld e, (hl)
inc hl
ld d, (hl)
ld a, #0x01
ld (de), a
di
call #_char_input_sub ; read from buffer
ei
jr nz, _rs232_arch_poll_ret
xor a ; we have no data in the buffer
ld (de), a
_rs232_arch_poll_ret:
ld l, a
ret