65 lines
1.4 KiB
C
Executable File
65 lines
1.4 KiB
C
Executable File
/*
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* ringbuffer.c
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*
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* Created on: Jul 24, 2012
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* Author: tkl
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*/
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#include "irq.h"
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#include "ringbuffer.h"
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//-----------------------------------------------------------------------------
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int ringbuffer_read(struct ringbuffer *this, char *buffer, int size) {
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int i;
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unsigned int irq;
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for(i = 0; i < size; i++) {
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if(this->used > 0) {
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irq = disable_irq();
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buffer[i] = *this->read;
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this->read++;
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this->used--;
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if(this->read >= (this->buffer + this->size)) {
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this->read = this->buffer;
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}
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restore_irq(irq);
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}
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else {
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return i;
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}
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}
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return 0;
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}
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//-----------------------------------------------------------------------------
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int ringbuffer_write(struct ringbuffer *this, const char *buffer,
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int size)
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{
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int i = 0;
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unsigned int irq;
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for(i = 0; i < size; i++) {
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if(this->used < this->size) {
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irq = disable_irq();
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*this->write = buffer[i];
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this->write++;
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this->used++;
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if(this->write >= (this->buffer + this->size)) {
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this->write = this->buffer;
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}
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restore_irq(irq);
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}
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else {
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return i;
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}
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}
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return i;
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}
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//-----------------------------------------------------------------------------
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int ringbuffer_is_full(const struct ringbuffer *this) {
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return (this->used == this->size) ? 1 : 0;
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}
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//-----------------------------------------------------------------------------
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int ringbuffer_is_empty(const struct ringbuffer *this) {
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return (this->used == 0) ? 1 : 0;
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}
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