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/* Buffered USB debug output
* (C) 2007 Henryk Plötz <henryk@ploetzli.ch>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <FreeRTOS.h>
#include <task.h>
#include <semphr.h>
#include <USB-CDC.h>
#include <string.h>
#include "usb_print.h"
#define BUFLEN (2*1024)
static char ringbuffer[BUFLEN];
static int ringstart, ringstop;
static int default_flush = 1, forced_silence = 0;
static xSemaphoreHandle print_semaphore;
void usb_print_buffer(const char* buffer, int start, int stop) {
usb_print_buffer_f(buffer,start,stop,default_flush);
}
int usb_print_buffer_f(const char* buffer, int start, int stop, int flush)
{
int pos=start, endpos=stop;
while(pos<stop) {
int available = BUFLEN-1 - (((ringstop+BUFLEN)-ringstart) % BUFLEN);
if(available == 0 && flush) {
usb_print_flush();
continue;
}
if((endpos-pos)>available) endpos=pos+available;
while(pos < endpos) {
ringbuffer[ringstop] = buffer[pos];
pos++;
available--;
ringstop = (ringstop+1) % BUFLEN;
}
if(flush) usb_print_flush();
else if(available==0)
return 0;
endpos=stop;
if(pos>=stop)
return (available > 0);
}
return 0;
}
void usb_print_string(const char *string) {
usb_print_string_f(string, default_flush);
}
int usb_print_string_f(const char* string, int flush)
{
int start = 0, stop = strlen(string);
return usb_print_buffer_f(string, start, stop, flush);
}
void usb_print_char(const char c) {
usb_print_char_f(c, default_flush);
}
int usb_print_char_f(const char c, int flush)
{
return usb_print_buffer_f(&c, 0, 1, flush);
}
int usb_print_get_default_flush(void)
{
return default_flush;
}
int usb_print_set_default_flush(int flush)
{
int old_flush = default_flush;
default_flush = flush;
return old_flush;
}
int usb_print_set_force_silence(int silence)
{
int old_silence = forced_silence;
forced_silence = silence;
return old_silence;
}
/* Must NOT be called from ISR context */
void usb_print_flush(void)
{
int oldstop, newstart;
if(forced_silence) return;
taskENTER_CRITICAL();
if(print_semaphore == NULL)
usb_print_init();
if(print_semaphore == NULL) {
taskEXIT_CRITICAL();
return;
}
taskEXIT_CRITICAL();
xSemaphoreTake(print_semaphore, portMAX_DELAY);
taskENTER_CRITICAL();
oldstop = ringstop;
newstart = ringstart;
taskEXIT_CRITICAL();
while(newstart != oldstop) {
vUSBSendByte_blocking(ringbuffer[newstart], 5*portTICK_RATE_MS);
newstart = (newstart+1) % BUFLEN;
}
taskENTER_CRITICAL();
ringstart = newstart;
taskEXIT_CRITICAL();
xSemaphoreGive(print_semaphore);
}
void usb_print_init(void)
{
memset(ringbuffer, 0, BUFLEN);
ringstart = ringstop = 0;
vSemaphoreCreateBinary( print_semaphore );
}
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