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#ifndef INCLUDED_ATOMIC_H
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#define INCLUDED_ATOMIC_H
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#ifndef INCLUDED_OS_TYPES_H
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#include <os_types.h>
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#endif /*INCLUDED_OS_TYPES_H*/
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#ifndef INCLUDED_OS_COMPILER_H
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#include <os_compiler.h>
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#endif /*INCLUDED_OS_COMPILER_H*/
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#ifndef INCLUDED_CMSIS_H
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#include <cmsis.h>
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#endif /*INCLUDED_CMSIS_H*/
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/* ------------------------------------------------------------------------------------------------------------------ */
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/* */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* ======================================================================== */
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/* 1. 内存序枚举 (简化版，适配 Cortex-M3 硬件特性) */
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/* ======================================================================== */
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typedef enum {
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memory_order_relaxed = 0, /* Maps to simple atomic access (no barriers) */
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memory_order_consume = 1,
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memory_order_acquire = 2, /* Usually implemented with a DMB instruction to ensure memory operations do not cross a boundary */
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memory_order_release = 3, /* Usually implemented with a DMB instruction to ensure memory operations do not cross a boundary */
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memory_order_acq_rel = 4,
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memory_order_seq_cst = 5 /* The default and safest; guarantees absolute ordering (uses DMB/DSB) */
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} atomic_memory_order;
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/* ======================================================================== */
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/* 2. 原子类型定义 */
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/* ======================================================================== */
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typedef volatile os_uint_t atomic_uint_t;
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typedef volatile os_int_t atomic_int_t;
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typedef volatile uint32_t atomic_uint32_t;
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typedef volatile int32_t atomic_int32_t;
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typedef volatile uint16_t atomic_uint16_t;
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typedef volatile int16_t atomic_int16_t;
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typedef volatile uint8_t atomic_uint8_t;
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typedef volatile int8_t atomic_int8_t;
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typedef volatile bool atomic_bool;
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/* 指针原子类型 (32位系统) */
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typedef volatile void* atomic_ptr_t;
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/* ======================================================================== */
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/* 3. 位带操作宏 (仅适用于 SRAM 0x20000000-0x200FFFFF 和 PERIPH 0x40000000-0x400FFFFF) */
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/* ======================================================================== */
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#define BITBAND_SRAM_REF 0x20000000
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#define BITBAND_SRAM_BASE 0x22000000
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#define BITBAND_PERI_REF 0x40000000
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#define BITBAND_PERI_BASE 0x42000000
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// 计算位带别名地址的宏
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// addr: 原始寄存器地址 (如 &GPIOA->ODR)
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// bit: 位序号 (0-31)
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#define BITBAND_ADDR(addr, bit) \
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(((uint32_t)(addr) & 0xF0000000) == 0x20000000 ? \
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(BITBAND_SRAM_BASE + ((uint32_t)(addr) - BITBAND_SRAM_REF) * 32 + (bit) * 4) : \
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(BITBAND_PERI_BASE + ((uint32_t)(addr) - BITBAND_PERI_REF) * 32 + (bit) * 4))
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// 访问位带地址的指针宏
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#define BITBAND_PTR(addr, bit) ((volatile uint32_t *)BITBAND_ADDR(addr, bit))
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// 示例：原子操作 GPIOA Pin 5 的输出
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// 定义一个指向位带别名地址的指针
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//#define PA5_OUT_BIT BITBAND_ADDR(&GPIOA->ODR, 5)
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/* ======================================================================== */
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/* 4. 核心原子操作函数声明 */
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/* ======================================================================== */
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/* --- 基础加载与存储 --- */
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uint32_t atomic_load_32(const atomic_uint32_t *obj);
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void atomic_store_32(atomic_uint32_t *obj, uint32_t desired);
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/* --- 交换操作, 返回交换前的值 --- */
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uint32_t atomic_exchange_32(atomic_uint32_t *obj, uint32_t desired);
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/* --- 比较并交换 (CAS) --- */
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/* 返回 true 如果交换成功，false 如果失败 (expected 会被更新为当前值) */
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bool atomic_compare_exchange_strong_32(atomic_uint32_t *obj, uint32_t *expected, uint32_t desired);
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bool atomic_compare_exchange_weak_32(atomic_uint32_t *obj, uint32_t *expected, uint32_t desired);
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/* --- 算术与位运算 (Fetch-and-Op) --- */
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/* 返回操作前的旧值 */
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uint32_t atomic_fetch_add_32(atomic_uint32_t *obj, uint32_t operand);
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uint32_t atomic_fetch_sub_32(atomic_uint32_t *obj, uint32_t operand);
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uint32_t atomic_fetch_and_32(atomic_uint32_t *obj, uint32_t operand);
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uint32_t atomic_fetch_or_32(atomic_uint32_t *obj, uint32_t operand);
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uint32_t atomic_fetch_xor_32(atomic_uint32_t *obj, uint32_t operand);
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/* --- 8位/16位支持 (通过掩码和LDREX/STREX实现) --- */
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uint8_t atomic_load_8(const atomic_uint8_t *obj);
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void atomic_store_8(atomic_uint8_t *obj, uint8_t desired);
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uint8_t atomic_fetch_add_8(atomic_uint8_t *obj, uint8_t operand);
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bool atomic_compare_exchange_strong_8(atomic_uint8_t *obj, uint8_t *expected, uint8_t desired);
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/* --- 位带专用原子操作 (仅用于 GPIO 或支持位带的寄存器/SRAM) --- */
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/* 设置指定位为 1 */
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void atomic_bit_set(volatile void *addr, os_uint_t bit);
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/* 清除指定位为 0 */
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void atomic_bit_clear(volatile void *addr, os_uint_t bit);
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/* 读取指定位的值 (0 或 1) */
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os_uint_t atomic_bit_read(volatile void *addr, os_uint_t bit);
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/* 翻转指定位 */
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void atomic_bit_toggle(volatile void *addr, os_uint_t bit);
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/* ------------------------------------------------------------------------------------------------------------------ */
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/* */
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#define atomic_load atomic_load_32
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#define atomic_store atomic_store_32
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#define atomic_exchange atomic_exchange_32
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#define atomic_compare_exchange_strong atomic_compare_exchange_strong_32
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#define atomic_compare_exchange_weak atomic_compare_exchange_weak_32
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#define atomic_fetch_add atomic_fetch_add_32
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#define atomic_fetch_sub atomic_fetch_sub_32
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#define atomic_fetch_and atomic_fetch_and_32
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#define atomic_fetch_or atomic_fetch_or_32
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#define atomic_fetch_xor atomic_fetch_xor_32
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#ifdef __cplusplus
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}
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#endif
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#endif /*INCLUDED_ATOMIC_H*/
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