Jeroen Lodder
Multi purpose buffer module.
Multipurpose ringbuffer
Since there weren't any ringbuffers available on the internet optimized for 32-Bit ARM operation without unix-calls and dynamic memory... I created one.
This module is a fixed ringbuffer, it does not allocate any memory, it can work as FIFO or LIFO or any other exotic mode depending on your imagination. With a fixed 32Bit element size it is optimized for 32 bit arm processors. Any smaller value will have overhead, any larger value will require a double entry. (not recommended)
I hope you can use it.
Information
This is not a C++ class, it is a C Module. It does work object oriented, however you cannot work on the object, you work with the object.
Diff: xIFO.h
- Revision:
- 0:a04dc0c57d20
- Child:
- 2:6013f6d867e5
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/xIFO.h Mon Oct 28 18:39:36 2013 +0000
@@ -0,0 +1,92 @@
+
+ /**
+ * @file xifo.h
+ * @brief xifo circular buffer
+ * @details xifo supplies object oriented circular buffer with 32 bit size elements. \n
+ * To use either as FIFO (First In First Out) or as FILO (First In Last Out)
+ *
+ * @author Jeroen Lodder
+ * @date April 2013
+ * @version 2
+ *
+ * @{
+ */
+
+ /**
+ * Code has been tested on Cortex M0 (LPC1114)
+ * Performance table, number of core clocks
+ * Measured with a timer before and after
+ * r1 = timer->TC
+ * test_function
+ * r2 = timer->TC
+ *
+ * Function Speed Worst Case
+ *
+ * write 69 71
+ * read_mr 59 59
+ * read_lr 63 70
+ * pop_mr 76 78
+ * pop_lr 45 45
+ *
+ */
+
+#ifndef _xifo_H_
+#define _xifo_H_
+
+#include <inttypes.h>
+
+#if defined(__arm__) || defined(__DOXYGEN__)
+#pragma anon_unions /**< Allow unnamed unions */
+#endif
+
+/**
+ * @brief Circular Buffer object.
+ * @details This struct holds the object of a circular buffer
+ */
+typedef struct {
+/* Pointers: */
+ uint32_t *startpool; /**< @brief First element in pool */
+ uint32_t *endpool; /**< @brief Last element in pool */
+ uint32_t *read; /**< @brief Read pointer */
+ uint32_t *write; /**< @brief Write pointer */
+/* Variables: */
+ uint32_t full; /**< @brief Flag indicating buffer is full */
+ uint32_t elementcount;/**< @brief Number of elements used */
+ uint32_t size; /**< @brief Size of buffer */
+/* Locally used in functions to prevent stack use: */
+ /**< @brief union to prevent lvalue typecasting */
+ union {
+ uint32_t temp; /**< @brief temp variable and padding for even sized block */
+ uint32_t *ptemp; /**< @brief temp variable and padding for even sized block */
+ };
+}xifo_t;
+
+/**
+ * @brief Circular Buffer memory pool type.
+ */
+typedef unsigned int xifo_pool_t;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+/* xifo Common */
+void xifo_init(xifo_t *c, uint32_t size, uint32_t *startpool);
+void xifo_clear(xifo_t *c);
+uint32_t xifo_write(xifo_t *c, uint32_t data);
+/* FIFO use */
+uint32_t xifo_read_lr(xifo_t *c, uint32_t index);
+uint32_t xifo_pop_lr(xifo_t *c);
+/* LIFO use */
+uint32_t xifo_read_mr(xifo_t *c, uint32_t index);
+uint32_t xifo_pop_mr(xifo_t *c);
+/* Extractors */
+uint32_t xifo_get_size(xifo_t *c);
+uint32_t xifo_get_used(xifo_t *c);
+uint32_t xifo_get_full(xifo_t *c);
+uint32_t xifo_get_free(xifo_t *c);
+#ifdef __cplusplus
+}
+#endif
+#endif //_xifo_H_
+
+/** @} */