问题描述
有什么办法可以禁用除其中一个以外的所有Cortex M3 MCU的irq?
Is there any way to disable all irq from Cortex M3 MCU except one ?
我的问题是，我有一个系统运行多种具有不同优先级的irq，并且我想禁用所有irq(在特定状态下除外).
My issue is that I have a system running several kinds of irq with various priority levels and I want to disable all irq except one in a particular state.
我知道我可以通过使用"__disable_irq()"指令来禁用所有irq，但是如果我之前没有调用过"__enable_irq()"，那么在调用此指令后我将无法启用一个irq.
I know I can disable all irq by using "__disable_irq()" instruction but I can't enable one irq after calling this instruction if I didn't call "__enable_irq()" before.
感谢您的帮助，
致谢
推荐答案
使用BASEPRI寄存器禁用所有低于指定优先级的中断.
Use the BASEPRI register to disable all interrupts below the specified priority level.
这是一个核心寄存器，在 Cortex-M3编程手册.
This is a core register, described in the Cortex-M3 Programming Manual.
CMSIS提供了__get_BASEPRI()和__set_BASEPRI()函数来操纵其值.
CMSIS provides the __get_BASEPRI() and __set_BASEPRI() functions to manipulate its value.
请注意，使用的是7-4位，必须将优先级值左移4.要禁用所有优先级为1或更低的中断，请使用
Note that bits 7-4 are used, the priority value must be shifted left by 4. To disable all interrupts with priority 1 or lower, use
__set_BASEPRI(1 << 4);
并启用所有功能，将其设置为0
and to enable all, set it to 0
__set_BASEPRI(0);
您当然应该相应地设置中断优先级，确保没有其他中断具有优先级0.
You should of course set interrupt priorities accordingly, ensuring that no other interrupt has priority 0.
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