mirror of https://github.com/ARMmbed/mbed-os.git
41 lines
1.2 KiB
C
41 lines
1.2 KiB
C
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#include "interrupt_sam_nvic.h"
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#if !defined(__DOXYGEN__)
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/* Deprecated - global flag to determine the global interrupt state. Required by
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* QTouch library, however new applications should use cpu_irq_is_enabled()
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* which probes the true global interrupt state from the CPU special registers.
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*/
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volatile bool g_interrupt_enabled = true;
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#endif
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void cpu_irq_enter_critical(void)
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{
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if (cpu_irq_critical_section_counter == 0) {
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if (cpu_irq_is_enabled()) {
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cpu_irq_disable();
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cpu_irq_prev_interrupt_state = true;
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} else {
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/* Make sure the to save the prev state as false */
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cpu_irq_prev_interrupt_state = false;
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}
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}
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cpu_irq_critical_section_counter++;
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}
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void cpu_irq_leave_critical(void)
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{
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/* Check if the user is trying to leave a critical section when not in a critical section */
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Assert(cpu_irq_critical_section_counter > 0);
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cpu_irq_critical_section_counter--;
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/* Only enable global interrupts when the counter reaches 0 and the state of the global interrupt flag
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was enabled when entering critical state */
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if ((cpu_irq_critical_section_counter == 0) && (cpu_irq_prev_interrupt_state)) {
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cpu_irq_enable();
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}
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}
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