MacroRat / MouseCode

Mouse code for the MacroRat

Dependencies:   ITG3200 QEI

mbed-dev/targets/TARGET_Silicon_Labs/TARGET_SL_RAIL/efr32-rf-driver/buffer-pool-memory-manager/buffer_pool_allocator.c@18:6a4db94011d3, 2017-05-14 (annotated)

Committer:
sahilmgandhi
Date:
Sun May 14 23:18:57 2017 +0000
Revision:
18:6a4db94011d3
Publishing again

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sahilmgandhi 18:6a4db94011d3 1 /***************************************************************************//**
sahilmgandhi 18:6a4db94011d3 2 * @file buffer_pool_allocator.c
sahilmgandhi 18:6a4db94011d3 3 * @brief The source for a simple memory allocator that statically creates pools
sahilmgandhi 18:6a4db94011d3 4 * of fixed size buffers to allocate from.
sahilmgandhi 18:6a4db94011d3 5 * @copyright Copyright 2015 Silicon Laboratories, Inc. http://www.silabs.com
sahilmgandhi 18:6a4db94011d3 6 ******************************************************************************/
sahilmgandhi 18:6a4db94011d3 7
sahilmgandhi 18:6a4db94011d3 8 #include <stdlib.h>
sahilmgandhi 18:6a4db94011d3 9
sahilmgandhi 18:6a4db94011d3 10 #include "buffer_pool_allocator.h"
sahilmgandhi 18:6a4db94011d3 11
sahilmgandhi 18:6a4db94011d3 12 #include "em_core.h"
sahilmgandhi 18:6a4db94011d3 13
sahilmgandhi 18:6a4db94011d3 14 #ifdef CONFIGURATION_HEADER
sahilmgandhi 18:6a4db94011d3 15 #include CONFIGURATION_HEADER
sahilmgandhi 18:6a4db94011d3 16 #endif
sahilmgandhi 18:6a4db94011d3 17
sahilmgandhi 18:6a4db94011d3 18 // -----------------------------------------------------------------------------
sahilmgandhi 18:6a4db94011d3 19 // Configuration Macros
sahilmgandhi 18:6a4db94011d3 20 // -----------------------------------------------------------------------------
sahilmgandhi 18:6a4db94011d3 21
sahilmgandhi 18:6a4db94011d3 22 #ifndef BUFFER_POOL_SIZE
sahilmgandhi 18:6a4db94011d3 23 #define BUFFER_POOL_SIZE 8
sahilmgandhi 18:6a4db94011d3 24 #endif
sahilmgandhi 18:6a4db94011d3 25 #ifndef MAX_BUFFER_SIZE
sahilmgandhi 18:6a4db94011d3 26 #define MAX_BUFFER_SIZE 160
sahilmgandhi 18:6a4db94011d3 27 #endif
sahilmgandhi 18:6a4db94011d3 28
sahilmgandhi 18:6a4db94011d3 29 #define INVALID_BUFFER_OBJ ((void*)0xFFFFFFFF)
sahilmgandhi 18:6a4db94011d3 30
sahilmgandhi 18:6a4db94011d3 31 typedef struct {
sahilmgandhi 18:6a4db94011d3 32 uint8_t refCount;
sahilmgandhi 18:6a4db94011d3 33 uint8_t data[MAX_BUFFER_SIZE];
sahilmgandhi 18:6a4db94011d3 34 } BufferPoolObj_t;
sahilmgandhi 18:6a4db94011d3 35
sahilmgandhi 18:6a4db94011d3 36 static BufferPoolObj_t memoryObjs[BUFFER_POOL_SIZE];
sahilmgandhi 18:6a4db94011d3 37
sahilmgandhi 18:6a4db94011d3 38 void* memoryAllocate(uint32_t size)
sahilmgandhi 18:6a4db94011d3 39 {
sahilmgandhi 18:6a4db94011d3 40 uint32_t i = 0;
sahilmgandhi 18:6a4db94011d3 41 void *handle = INVALID_BUFFER_OBJ;
sahilmgandhi 18:6a4db94011d3 42
sahilmgandhi 18:6a4db94011d3 43 // We can't support sizes greater than the maximum heap buffer size
sahilmgandhi 18:6a4db94011d3 44 if(size > MAX_BUFFER_SIZE) {
sahilmgandhi 18:6a4db94011d3 45 return INVALID_BUFFER_OBJ;
sahilmgandhi 18:6a4db94011d3 46 }
sahilmgandhi 18:6a4db94011d3 47
sahilmgandhi 18:6a4db94011d3 48 CORE_DECLARE_IRQ_STATE;
sahilmgandhi 18:6a4db94011d3 49 CORE_ENTER_CRITICAL();
sahilmgandhi 18:6a4db94011d3 50 for(i = 0; i < BUFFER_POOL_SIZE; i++)
sahilmgandhi 18:6a4db94011d3 51 {
sahilmgandhi 18:6a4db94011d3 52 if(memoryObjs[i].refCount == 0)
sahilmgandhi 18:6a4db94011d3 53 {
sahilmgandhi 18:6a4db94011d3 54 memoryObjs[i].refCount = 1;
sahilmgandhi 18:6a4db94011d3 55 handle = (void*)i;
sahilmgandhi 18:6a4db94011d3 56 break;
sahilmgandhi 18:6a4db94011d3 57 }
sahilmgandhi 18:6a4db94011d3 58 }
sahilmgandhi 18:6a4db94011d3 59 CORE_EXIT_CRITICAL();
sahilmgandhi 18:6a4db94011d3 60
sahilmgandhi 18:6a4db94011d3 61 return handle;
sahilmgandhi 18:6a4db94011d3 62 }
sahilmgandhi 18:6a4db94011d3 63
sahilmgandhi 18:6a4db94011d3 64 void *memoryPtrFromHandle(void *handle)
sahilmgandhi 18:6a4db94011d3 65 {
sahilmgandhi 18:6a4db94011d3 66 void *ptr = NULL;
sahilmgandhi 18:6a4db94011d3 67
sahilmgandhi 18:6a4db94011d3 68 // Make sure we were given a valid handle
sahilmgandhi 18:6a4db94011d3 69 if((handle == INVALID_BUFFER_OBJ) || ((uint32_t)handle > BUFFER_POOL_SIZE))
sahilmgandhi 18:6a4db94011d3 70 {
sahilmgandhi 18:6a4db94011d3 71 return NULL;
sahilmgandhi 18:6a4db94011d3 72 }
sahilmgandhi 18:6a4db94011d3 73
sahilmgandhi 18:6a4db94011d3 74 CORE_DECLARE_IRQ_STATE;
sahilmgandhi 18:6a4db94011d3 75 CORE_ENTER_CRITICAL();
sahilmgandhi 18:6a4db94011d3 76 if(memoryObjs[(uint32_t)handle].refCount > 0)
sahilmgandhi 18:6a4db94011d3 77 {
sahilmgandhi 18:6a4db94011d3 78 ptr = memoryObjs[(uint32_t)handle].data;
sahilmgandhi 18:6a4db94011d3 79 }
sahilmgandhi 18:6a4db94011d3 80 CORE_EXIT_CRITICAL();
sahilmgandhi 18:6a4db94011d3 81
sahilmgandhi 18:6a4db94011d3 82 return ptr;
sahilmgandhi 18:6a4db94011d3 83 }
sahilmgandhi 18:6a4db94011d3 84
sahilmgandhi 18:6a4db94011d3 85 void memoryFree(void *handle)
sahilmgandhi 18:6a4db94011d3 86 {
sahilmgandhi 18:6a4db94011d3 87 CORE_DECLARE_IRQ_STATE;
sahilmgandhi 18:6a4db94011d3 88 CORE_ENTER_CRITICAL();
sahilmgandhi 18:6a4db94011d3 89 if(memoryPtrFromHandle(handle) != NULL)
sahilmgandhi 18:6a4db94011d3 90 {
sahilmgandhi 18:6a4db94011d3 91 memoryObjs[(uint32_t)handle].refCount--;
sahilmgandhi 18:6a4db94011d3 92 }
sahilmgandhi 18:6a4db94011d3 93 CORE_EXIT_CRITICAL();
sahilmgandhi 18:6a4db94011d3 94 }
sahilmgandhi 18:6a4db94011d3 95
sahilmgandhi 18:6a4db94011d3 96 void memoryTakeReference(void *handle)
sahilmgandhi 18:6a4db94011d3 97 {
sahilmgandhi 18:6a4db94011d3 98 CORE_DECLARE_IRQ_STATE;
sahilmgandhi 18:6a4db94011d3 99 CORE_ENTER_CRITICAL();
sahilmgandhi 18:6a4db94011d3 100 if(memoryPtrFromHandle(handle) != NULL)
sahilmgandhi 18:6a4db94011d3 101 {
sahilmgandhi 18:6a4db94011d3 102 memoryObjs[(uint32_t)handle].refCount++;
sahilmgandhi 18:6a4db94011d3 103 }
sahilmgandhi 18:6a4db94011d3 104 CORE_EXIT_CRITICAL();
sahilmgandhi 18:6a4db94011d3 105 }