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arm7 中断

net_hawk 发表于 2008-7-17 11:34:00 /*===================================================================================== Enabling and disabling interrupts Interrupts are enabled or disabled by reading the CPSR flags and updating bit 7. Example 4-2 shows how this can be done by using small functions that can be inlined. These functions work only in a privileged mode, because the control bits of the CPSR and SPSR cannot be changed when in User mode. ====================================================================================*/ void enable_IRQ(void) {     int tmp;     __asm     {         MRS tmp, CPSR         BIC tmp, tmp, #0x80         MSR CPSR_c, tmp     } } void disable_IRQ(void) {     int tmp;     __asm     {         MRS tmp, CPSR         ORR tmp, tmp, #0x80         MSR CPSR_c, tmp     } }

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