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Convert to use unsigned buffer

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This commit is contained in:
Russell Gallop
2011-08-11 16:06:04 +01:00
parent ff035c8b08
commit 5f0a15d4dc
2 changed files with 11 additions and 12 deletions
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15
module_usb_midi/src/queue.c
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@@ -2,21 +2,21 @@
#include "queue.h" #include "queue.h"
// This presumes that the xc compiler will not re-use the mem passed to init_queue // This presumes that the xc compiler will not re-use the mem passed to init_queue
void init_queue(queue *q, int arr[], int size) { void init_queue(queue *q, unsigned arr[], int size) {
q->rdptr = 0; q->rdptr = 0;
q->wrptr = 0; q->wrptr = 0;
q->data = (intptr_t)arr; q->data = (uintptr_t)arr;
q->size = size; // presume that size is power of two q->size = size; // presume that size is power of two
q->mask = size - 1; q->mask = size - 1;
} }
extern inline void enqueue(queue *q, int value) { extern inline void enqueue(queue *q, unsigned value) {
((int *)q->data)[q->wrptr & q->mask] = value; ((unsigned *)q->data)[q->wrptr & q->mask] = value;
q->wrptr++; q->wrptr++;
} }
extern inline int dequeue(queue *q) { extern inline unsigned dequeue(queue *q) {
int retval = ((int *)q->data)[q->rdptr & q->mask]; unsigned retval = ((unsigned *)q->data)[q->rdptr & q->mask];
q->rdptr++; q->rdptr++;
return retval; return retval;
} }
@@ -41,8 +41,7 @@ extern inline int space(queue *q) {
void dump(queue *q) { void dump(queue *q) {
for (int i = q->rdptr; i != q->wrptr; i++) { for (int i = q->rdptr; i != q->wrptr; i++) {
printf("a[%d] = %d\n", i & q->mask, ((int *)q->data)[i & q->mask]); printf("a[%d] = %d\n", i & q->mask, ((unsigned *)q->data)[i & q->mask]);
} }
} }

8
module_usb_midi/src/queue.h
View File

@@ -5,16 +5,16 @@
#include <xccompat.h> #include <xccompat.h>
typedef struct queue { typedef struct queue {
intptr_t data; uintptr_t data;
int rdptr; // Using absolute indices which count reads and writes so this needs to be considered when accessing. int rdptr; // Using absolute indices which count reads and writes so this needs to be considered when accessing.
int wrptr; int wrptr;
int size; int size;
int mask; int mask;
} queue; } queue;
void init_queue(REFERENCE_PARAM(queue, q), int arr[], int size); void init_queue(REFERENCE_PARAM(queue, q), unsigned arr[], int size);
void enqueue(REFERENCE_PARAM(queue, q), int value); void enqueue(REFERENCE_PARAM(queue, q), unsigned value);
int dequeue(REFERENCE_PARAM(queue, q)); unsigned dequeue(REFERENCE_PARAM(queue, q));
int isempty(REFERENCE_PARAM(queue, q)); int isempty(REFERENCE_PARAM(queue, q));
int isfull(REFERENCE_PARAM(queue, q)); int isfull(REFERENCE_PARAM(queue, q));
int items(REFERENCE_PARAM(queue, q)); int items(REFERENCE_PARAM(queue, q));