58 lines
1.5 KiB
C
58 lines
1.5 KiB
C
/******************************************************************************
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* @file app_defer.c
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* @brief ISR→任务上下文的延后执行标志位实现
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* @author cyWu <1917507415@qq.com>
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* @date 2026.08.31
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* @version V1.0.0，首次发布
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******************************************************************************/
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#include "system/includes.h"
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#include "app_defer.h"
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/** 位掩码，volatile：request() 在中断上下文写，take()/is_pending()/cancel()
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* 在任务上下文读写，两侧都用 local_irq_disable/enable 包一下读改写，
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* 避免"任务侧正在清 A 位时中断侧设 B 位"这种读改写竞态把 B 位冲丢。 */
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static volatile uint8_t s_flags;
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void app_defer_request(AppDeferBit_t bit)
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{
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if (bit >= APP_DEFER_MAX) {
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return;
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}
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local_irq_disable();
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s_flags |= (uint8_t)(1u << bit);
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local_irq_enable();
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}
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uint8_t app_defer_take(AppDeferBit_t bit)
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{
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uint8_t was_set;
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if (bit >= APP_DEFER_MAX) {
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return 0;
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}
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local_irq_disable();
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was_set = (s_flags & (uint8_t)(1u << bit)) ? 1 : 0;
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s_flags &= (uint8_t)~(1u << bit);
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local_irq_enable();
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return was_set;
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}
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uint8_t app_defer_is_pending(AppDeferBit_t bit)
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{
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if (bit >= APP_DEFER_MAX) {
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return 0;
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}
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return (s_flags & (uint8_t)(1u << bit)) ? 1 : 0;
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}
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void app_defer_cancel(AppDeferBit_t bit)
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{
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if (bit >= APP_DEFER_MAX) {
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return;
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}
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local_irq_disable();
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s_flags &= (uint8_t)~(1u << bit);
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local_irq_enable();
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}
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