mirror of https://github.com/SQ9MDD/ESP32IGate.git
107 lines
2.1 KiB
C
107 lines
2.1 KiB
C
#ifndef UTIL_FIFO_H
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#define UTIL_FIFO_H
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#include <Arduino.h>
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#include <stddef.h>
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#define xt_rsil(level) (__extension__({uint32_t state; __asm__ __volatile__("rsil %0," __STRINGIFY(level) : "=a" (state)); state;}))
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#define xt_wsr_ps(state) __asm__ __volatile__("wsr %0,ps; isync" :: "a" (state) : "memory")
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#define RB_ATOMIC_START do { uint32_t _savedIS = xt_rsil(1) ;
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#define RB_ATOMIC_END xt_wsr_ps(_savedIS) ;} while(0);
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typedef struct FIFOBuffer
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{
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unsigned char *begin;
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unsigned char *end;
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unsigned char * volatile head;
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unsigned char * volatile tail;
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} FIFOBuffer;
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inline bool fifo_isempty(const FIFOBuffer *f) {
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return f->head == f->tail;
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}
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inline bool fifo_isfull(const FIFOBuffer *f) {
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return ((f->head == f->begin) && (f->tail == f->end)) || (f->tail == f->head - 1);
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}
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inline void fifo_push(FIFOBuffer *f, unsigned char c) {
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*(f->tail) = c;
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if (f->tail == f->end) {
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f->tail = f->begin;
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} else {
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f->tail++;
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}
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}
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inline unsigned char fifo_pop(FIFOBuffer *f) {
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if(f->head == f->end) {
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f->head = f->begin;
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return *(f->end);
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} else {
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return *(f->head++);
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}
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}
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inline void fifo_flush(FIFOBuffer *f) {
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f->head = f->tail;
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}
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inline bool fifo_isempty_locked(const FIFOBuffer *f) {
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bool result;
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RB_ATOMIC_START
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{
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result = fifo_isempty(f);
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}
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RB_ATOMIC_END
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return result;
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}
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inline bool fifo_isfull_locked(const FIFOBuffer *f) {
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bool result;
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RB_ATOMIC_START
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{
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result = fifo_isfull(f);
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}
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RB_ATOMIC_END
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return result;
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}
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inline void fifo_push_locked(FIFOBuffer *f, unsigned char c) {
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RB_ATOMIC_START
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{
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fifo_push(f, c);
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}
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RB_ATOMIC_END
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}
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inline unsigned char fifo_pop_locked(FIFOBuffer *f) {
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unsigned char c;
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RB_ATOMIC_START
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{
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c = fifo_pop(f);
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}
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RB_ATOMIC_END
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return c;
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}
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inline void fifo_init(FIFOBuffer *f, unsigned char *buffer, size_t size) {
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f->head = f->tail = f->begin = buffer;
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f->end = buffer + size -1;
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}
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inline size_t fifo_len(FIFOBuffer *f) {
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//return f->end - f->begin;
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if(f->tail>f->head){
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return f->tail-f->head;
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}else{
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return (f->end-f->head)+(f->tail-f->begin);
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}
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return 0;
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}
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#endif |