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configurable line buffer size + simplified interrupt handler + overflow check on line buffer

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This commit is contained in:
fros4943 2009-11-02 12:47:06 +00:00
parent 5aab2eb77d
commit 5f71e9914e
1 changed files with 30 additions and 35 deletions
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65
core/dev/serial-line.c
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@ -28,7 +28,7 @@
*
* This file is part of the Contiki operating system.
*
* @(#)$Id: serial-line.c,v 1.2 2009/10/27 16:20:31 fros4943 Exp $
* @(#)$Id: serial-line.c,v 1.3 2009/11/02 12:47:06 fros4943 Exp $
*/
#include "dev/serial-line.h"
#include <string.h> /* for memcpy() */
@ -56,44 +56,37 @@ PROCESS(serial_line_process, "Serial driver");
process_event_t serial_line_event_message;
/*---------------------------------------------------------------------------*/
int
serial_line_input_byte(unsigned char c)
{
static uint8_t overflow = 0; /* Buffer overflow: ignore until END */
if (IGNORE_CHAR(c)) {
return 0;
}
if(!IGNORE_CHAR(c)) {
if(!overflow) {
/* Add character */
if(ringbuf_put(&rxbuf, c) == 0) {
/* Buffer overflow: ignore the rest of the line */
overflow = 1;
process_poll(&serial_line_process);
}
} else {
/* Buffer overflowed:
* Only (try to) add terminator characters, otherwise skip */
if(c == END && ringbuf_put(&rxbuf, c) != 0) {
overflow = 0;
} else {
process_poll(&serial_line_process);
}
if(!overflow) {
/* Add character */
if(ringbuf_put(&rxbuf, c) == 0) {
/* Buffer overflow: ignore the rest of the line */
overflow = 1;
}
if(c == END && !overflow) {
/* Tell process at least one (potentially cropped due to overflow)
* line exists in the buffer */
process_poll(&serial_line_process);
return 1;
} else {
/* Buffer overflowed:
* Only (try to) add terminator characters, otherwise skip */
if(c == END && ringbuf_put(&rxbuf, c) != 0) {
overflow = 0;
}
}
return 0;
/* Wake up consumer process */
process_poll(&serial_line_process);
return 1;
}
/*---------------------------------------------------------------------------*/
PROCESS_THREAD(serial_line_process, ev, data)
{
static char buf[128];
static char buf[BUFSIZE];
static int ptr;
PROCESS_BEGIN();
@ -110,20 +103,22 @@ PROCESS_THREAD(serial_line_process, ev, data)
PROCESS_YIELD();
} else {
if(c != END) {
buf[ptr++] = (uint8_t)c;
if(ptr < BUFSIZE-1) {
buf[ptr++] = (uint8_t)c;
} else {
/* Ignore character (wait for EOL) */
}
} else {
/* Terminate */
buf[ptr++] = (uint8_t)'\0';
if (ptr > 1) {
/* Broadcast event */
process_post(PROCESS_BROADCAST, serial_line_event_message, buf);
/* Broadcast event */
process_post(PROCESS_BROADCAST, serial_line_event_message, buf);
/* Wait until all processes have handled the serial line event */
if(PROCESS_ERR_OK ==
process_post(PROCESS_CURRENT(), PROCESS_EVENT_CONTINUE, NULL)) {
PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_CONTINUE);
}
/* Wait until all processes have handled the serial line event */
if(PROCESS_ERR_OK ==
process_post(PROCESS_CURRENT(), PROCESS_EVENT_CONTINUE, NULL)) {
PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_CONTINUE);
}
ptr = 0;
}